1964 satır
56 KiB
PHP
1964 satır
56 KiB
PHP
<?php
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/**
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* @addtogroup database
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* @{
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*/
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/**
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* @file
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* Non-specific Database query code. Used by all engines.
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*/
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/**
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* Interface for a conditional clause in a query.
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*/
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interface QueryConditionInterface {
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/**
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* Helper function: builds the most common conditional clauses.
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*
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* This method can take a variable number of parameters. If called with two
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* parameters, they are taken as $field and $value with $operator having a
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* value of IN if $value is an array and = otherwise.
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*
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* Do not use this method to test for NULL values. Instead, use
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* QueryConditionInterface::isNull() or QueryConditionInterface::isNotNull().
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*
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* @param $field
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* The name of the field to check. If you would like to add a more complex
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* condition involving operators or functions, use where().
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* @param $value
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* The value to test the field against. In most cases, this is a scalar.
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* For more complex options, it is an array. The meaning of each element in
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* the array is dependent on the $operator.
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* @param $operator
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* The comparison operator, such as =, <, or >=. It also accepts more
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* complex options such as IN, LIKE, or BETWEEN. Defaults to IN if $value is
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* an array, and = otherwise.
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*
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* @return QueryConditionInterface
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* The called object.
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*
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* @see QueryConditionInterface::isNull()
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* @see QueryConditionInterface::isNotNull()
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*/
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public function condition($field, $value = NULL, $operator = NULL);
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/**
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* Adds an arbitrary WHERE clause to the query.
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*
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* @param $snippet
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* A portion of a WHERE clause as a prepared statement. It must use named
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* placeholders, not ? placeholders.
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* @param $args
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* An associative array of arguments.
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*
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* @return QueryConditionInterface
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* The called object.
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*/
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public function where($snippet, $args = array());
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/**
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* Sets a condition that the specified field be NULL.
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*
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* @param $field
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* The name of the field to check.
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*
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* @return QueryConditionInterface
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* The called object.
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*/
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public function isNull($field);
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/**
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* Sets a condition that the specified field be NOT NULL.
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*
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* @param $field
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* The name of the field to check.
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*
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* @return QueryConditionInterface
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* The called object.
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*/
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public function isNotNull($field);
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/**
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* Sets a condition that the specified subquery returns values.
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*
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* @param SelectQueryInterface $select
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* The subquery that must contain results.
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*
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* @return QueryConditionInterface
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* The called object.
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*/
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public function exists(SelectQueryInterface $select);
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/**
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* Sets a condition that the specified subquery returns no values.
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*
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* @param SelectQueryInterface $select
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* The subquery that must not contain results.
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*
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* @return QueryConditionInterface
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* The called object.
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*/
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public function notExists(SelectQueryInterface $select);
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/**
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* Gets a complete list of all conditions in this conditional clause.
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*
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* This method returns by reference. That allows alter hooks to access the
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* data structure directly and manipulate it before it gets compiled.
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*
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* The data structure that is returned is an indexed array of entries, where
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* each entry looks like the following:
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* @code
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* array(
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* 'field' => $field,
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* 'value' => $value,
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* 'operator' => $operator,
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* );
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* @endcode
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*
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* In the special case that $operator is NULL, the $field is taken as a raw
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* SQL snippet (possibly containing a function) and $value is an associative
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* array of placeholders for the snippet.
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*
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* There will also be a single array entry of #conjunction, which is the
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* conjunction that will be applied to the array, such as AND.
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*/
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public function &conditions();
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/**
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* Gets a complete list of all values to insert into the prepared statement.
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*
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* @return
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* An associative array of placeholders and values.
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*/
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public function arguments();
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/**
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* Compiles the saved conditions for later retrieval.
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*
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* This method does not return anything, but simply prepares data to be
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* retrieved via __toString() and arguments().
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*
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* @param $connection
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* The database connection for which to compile the conditionals.
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* @param $queryPlaceholder
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* The query this condition belongs to. If not given, the current query is
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* used.
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*/
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public function compile(DatabaseConnection $connection, QueryPlaceholderInterface $queryPlaceholder);
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/**
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* Check whether a condition has been previously compiled.
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*
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* @return
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* TRUE if the condition has been previously compiled.
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*/
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public function compiled();
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}
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/**
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* Interface for a query that can be manipulated via an alter hook.
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*/
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interface QueryAlterableInterface {
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/**
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* Adds a tag to a query.
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*
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* Tags are strings that identify a query. A query may have any number of
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* tags. Tags are used to mark a query so that alter hooks may decide if they
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* wish to take action. Tags should be all lower-case and contain only
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* letters, numbers, and underscore, and start with a letter. That is, they
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* should follow the same rules as PHP identifiers in general.
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*
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* @param $tag
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* The tag to add.
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*
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* @return QueryAlterableInterface
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* The called object.
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*/
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public function addTag($tag);
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/**
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* Determines if a given query has a given tag.
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*
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* @param $tag
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* The tag to check.
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*
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* @return
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* TRUE if this query has been marked with this tag, FALSE otherwise.
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*/
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public function hasTag($tag);
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/**
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* Determines if a given query has all specified tags.
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*
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* @param $tags
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* A variable number of arguments, one for each tag to check.
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*
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* @return
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* TRUE if this query has been marked with all specified tags, FALSE
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* otherwise.
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*/
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public function hasAllTags();
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/**
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* Determines if a given query has any specified tag.
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*
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* @param $tags
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* A variable number of arguments, one for each tag to check.
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*
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* @return
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* TRUE if this query has been marked with at least one of the specified
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* tags, FALSE otherwise.
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*/
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public function hasAnyTag();
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/**
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* Adds additional metadata to the query.
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*
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* Often, a query may need to provide additional contextual data to alter
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* hooks. Alter hooks may then use that information to decide if and how
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* to take action.
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*
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* @param $key
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* The unique identifier for this piece of metadata. Must be a string that
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* follows the same rules as any other PHP identifier.
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* @param $object
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* The additional data to add to the query. May be any valid PHP variable.
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*
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* @return QueryAlterableInterface
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* The called object.
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*/
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public function addMetaData($key, $object);
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/**
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* Retrieves a given piece of metadata.
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*
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* @param $key
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* The unique identifier for the piece of metadata to retrieve.
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*
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* @return
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* The previously attached metadata object, or NULL if one doesn't exist.
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*/
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public function getMetaData($key);
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}
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/**
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* Interface for a query that accepts placeholders.
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*/
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interface QueryPlaceholderInterface {
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/**
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* Returns a unique identifier for this object.
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*/
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public function uniqueIdentifier();
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/**
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* Returns the next placeholder ID for the query.
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*
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* @return
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* The next available placeholder ID as an integer.
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*/
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public function nextPlaceholder();
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}
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/**
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* Base class for query builders.
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*
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* Note that query builders use PHP's magic __toString() method to compile the
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* query object into a prepared statement.
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*/
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abstract class Query implements QueryPlaceholderInterface {
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/**
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* The connection object on which to run this query.
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*
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* @var DatabaseConnection
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*/
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protected $connection;
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/**
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* The target of the connection object.
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*
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* @var string
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*/
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protected $connectionTarget;
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/**
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* The key of the connection object.
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*
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* @var string
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*/
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protected $connectionKey;
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/**
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* The query options to pass on to the connection object.
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*
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* @var array
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*/
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protected $queryOptions;
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/**
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* A unique identifier for this query object.
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*/
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protected $uniqueIdentifier;
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/**
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* The placeholder counter.
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*/
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protected $nextPlaceholder = 0;
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/**
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* An array of comments that can be prepended to a query.
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*
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* @var array
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*/
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protected $comments = array();
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/**
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* Constructs a Query object.
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*
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* @param DatabaseConnection $connection
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* Database connection object.
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* @param array $options
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* Array of query options.
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*/
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public function __construct(DatabaseConnection $connection, $options) {
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$this->uniqueIdentifier = uniqid('', TRUE);
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$this->connection = $connection;
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$this->connectionKey = $this->connection->getKey();
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$this->connectionTarget = $this->connection->getTarget();
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$this->queryOptions = $options;
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}
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/**
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* Implements the magic __sleep function to disconnect from the database.
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*/
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public function __sleep() {
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$keys = get_object_vars($this);
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unset($keys['connection']);
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return array_keys($keys);
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}
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/**
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* Implements the magic __wakeup function to reconnect to the database.
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*/
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public function __wakeup() {
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$this->connection = Database::getConnection($this->connectionTarget, $this->connectionKey);
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}
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/**
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* Implements the magic __clone function.
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*/
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public function __clone() {
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$this->uniqueIdentifier = uniqid('', TRUE);
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}
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/**
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* Runs the query against the database.
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*/
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abstract protected function execute();
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/**
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* Implements PHP magic __toString method to convert the query to a string.
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*
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* The toString operation is how we compile a query object to a prepared
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* statement.
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*
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* @return
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* A prepared statement query string for this object.
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*/
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abstract public function __toString();
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/**
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* Returns a unique identifier for this object.
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*/
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public function uniqueIdentifier() {
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return $this->uniqueIdentifier;
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}
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/**
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* Gets the next placeholder value for this query object.
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*
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* @return int
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* Next placeholder value.
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*/
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public function nextPlaceholder() {
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return $this->nextPlaceholder++;
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}
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/**
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* Adds a comment to the query.
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*
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* By adding a comment to a query, you can more easily find it in your
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* query log or the list of active queries on an SQL server. This allows
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* for easier debugging and allows you to more easily find where a query
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* with a performance problem is being generated.
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*
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* The comment string will be sanitized to remove * / and other characters
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* that may terminate the string early so as to avoid SQL injection attacks.
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*
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* @param $comment
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* The comment string to be inserted into the query.
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*
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* @return Query
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* The called object.
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*/
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public function comment($comment) {
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$this->comments[] = $comment;
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return $this;
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}
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/**
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* Returns a reference to the comments array for the query.
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*
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* Because this method returns by reference, alter hooks may edit the comments
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* array directly to make their changes. If just adding comments, however, the
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* use of comment() is preferred.
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*
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* Note that this method must be called by reference as well:
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* @code
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* $comments =& $query->getComments();
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* @endcode
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*
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* @return
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* A reference to the comments array structure.
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*/
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public function &getComments() {
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return $this->comments;
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}
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}
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/**
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* General class for an abstracted INSERT query.
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*/
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class InsertQuery extends Query {
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/**
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* The table on which to insert.
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*
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* @var string
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*/
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protected $table;
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/**
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* An array of fields on which to insert.
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*
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* @var array
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*/
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protected $insertFields = array();
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/**
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* An array of fields that should be set to their database-defined defaults.
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*
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* @var array
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*/
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protected $defaultFields = array();
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/**
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* A nested array of values to insert.
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*
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* $insertValues is an array of arrays. Each sub-array is either an
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* associative array whose keys are field names and whose values are field
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* values to insert, or a non-associative array of values in the same order
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* as $insertFields.
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*
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* Whether multiple insert sets will be run in a single query or multiple
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* queries is left to individual drivers to implement in whatever manner is
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* most appropriate. The order of values in each sub-array must match the
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* order of fields in $insertFields.
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*
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* @var array
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*/
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protected $insertValues = array();
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/**
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* A SelectQuery object to fetch the rows that should be inserted.
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*
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* @var SelectQueryInterface
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*/
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protected $fromQuery;
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/**
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* Constructs an InsertQuery object.
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*
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* @param DatabaseConnection $connection
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* A DatabaseConnection object.
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* @param string $table
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* Name of the table to associate with this query.
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* @param array $options
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* Array of database options.
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*/
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public function __construct($connection, $table, array $options = array()) {
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if (!isset($options['return'])) {
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$options['return'] = Database::RETURN_INSERT_ID;
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}
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parent::__construct($connection, $options);
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$this->table = $table;
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}
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/**
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* Adds a set of field->value pairs to be inserted.
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*
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* This method may only be called once. Calling it a second time will be
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* ignored. To queue up multiple sets of values to be inserted at once,
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* use the values() method.
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*
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* @param $fields
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* An array of fields on which to insert. This array may be indexed or
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* associative. If indexed, the array is taken to be the list of fields.
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* If associative, the keys of the array are taken to be the fields and
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* the values are taken to be corresponding values to insert. If a
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* $values argument is provided, $fields must be indexed.
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* @param $values
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* An array of fields to insert into the database. The values must be
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* specified in the same order as the $fields array.
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*
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* @return InsertQuery
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* The called object.
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*/
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public function fields(array $fields, array $values = array()) {
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if (empty($this->insertFields)) {
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if (empty($values)) {
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if (!is_numeric(key($fields))) {
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$values = array_values($fields);
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$fields = array_keys($fields);
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}
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}
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$this->insertFields = $fields;
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if (!empty($values)) {
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$this->insertValues[] = $values;
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}
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}
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return $this;
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}
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/**
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* Adds another set of values to the query to be inserted.
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*
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* If $values is a numeric-keyed array, it will be assumed to be in the same
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* order as the original fields() call. If it is associative, it may be
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* in any order as long as the keys of the array match the names of the
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* fields.
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*
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* @param $values
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* An array of values to add to the query.
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*
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* @return InsertQuery
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* The called object.
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*/
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public function values(array $values) {
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if (is_numeric(key($values))) {
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$this->insertValues[] = $values;
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}
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else {
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// Reorder the submitted values to match the fields array.
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foreach ($this->insertFields as $key) {
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$insert_values[$key] = $values[$key];
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}
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// For consistency, the values array is always numerically indexed.
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$this->insertValues[] = array_values($insert_values);
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}
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return $this;
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}
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/**
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* Specifies fields for which the database defaults should be used.
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*
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* If you want to force a given field to use the database-defined default,
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* not NULL or undefined, use this method to instruct the database to use
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* default values explicitly. In most cases this will not be necessary
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* unless you are inserting a row that is all default values, as you cannot
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* specify no values in an INSERT query.
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*
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* Specifying a field both in fields() and in useDefaults() is an error
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* and will not execute.
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*
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* @param $fields
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* An array of values for which to use the default values
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* specified in the table definition.
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*
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* @return InsertQuery
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* The called object.
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*/
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public function useDefaults(array $fields) {
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$this->defaultFields = $fields;
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return $this;
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}
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/**
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* Sets the fromQuery on this InsertQuery object.
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*
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* @param SelectQueryInterface $query
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* The query to fetch the rows that should be inserted.
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*
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* @return InsertQuery
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* The called object.
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*/
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public function from(SelectQueryInterface $query) {
|
|
$this->fromQuery = $query;
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Executes the insert query.
|
|
*
|
|
* @return
|
|
* The last insert ID of the query, if one exists. If the query
|
|
* was given multiple sets of values to insert, the return value is
|
|
* undefined. If no fields are specified, this method will do nothing and
|
|
* return NULL. That makes it safe to use in multi-insert loops.
|
|
*/
|
|
public function execute() {
|
|
// If validation fails, simply return NULL. Note that validation routines
|
|
// in preExecute() may throw exceptions instead.
|
|
if (!$this->preExecute()) {
|
|
return NULL;
|
|
}
|
|
|
|
// If we're selecting from a SelectQuery, finish building the query and
|
|
// pass it back, as any remaining options are irrelevant.
|
|
if (!empty($this->fromQuery)) {
|
|
$sql = (string) $this;
|
|
// The SelectQuery may contain arguments, load and pass them through.
|
|
return $this->connection->query($sql, $this->fromQuery->getArguments(), $this->queryOptions);
|
|
}
|
|
|
|
$last_insert_id = 0;
|
|
|
|
// Each insert happens in its own query in the degenerate case. However,
|
|
// we wrap it in a transaction so that it is atomic where possible. On many
|
|
// databases, such as SQLite, this is also a notable performance boost.
|
|
$transaction = $this->connection->startTransaction();
|
|
|
|
try {
|
|
$sql = (string) $this;
|
|
foreach ($this->insertValues as $insert_values) {
|
|
$last_insert_id = $this->connection->query($sql, $insert_values, $this->queryOptions);
|
|
}
|
|
}
|
|
catch (Exception $e) {
|
|
// One of the INSERTs failed, rollback the whole batch.
|
|
$transaction->rollback();
|
|
// Rethrow the exception for the calling code.
|
|
throw $e;
|
|
}
|
|
|
|
// Re-initialize the values array so that we can re-use this query.
|
|
$this->insertValues = array();
|
|
|
|
// Transaction commits here where $transaction looses scope.
|
|
|
|
return $last_insert_id;
|
|
}
|
|
|
|
/**
|
|
* Implements PHP magic __toString method to convert the query to a string.
|
|
*
|
|
* @return string
|
|
* The prepared statement.
|
|
*/
|
|
public function __toString() {
|
|
// Create a sanitized comment string to prepend to the query.
|
|
$comments = $this->connection->makeComment($this->comments);
|
|
|
|
// Default fields are always placed first for consistency.
|
|
$insert_fields = array_merge($this->defaultFields, $this->insertFields);
|
|
|
|
if (!empty($this->fromQuery)) {
|
|
return $comments . 'INSERT INTO {' . $this->table . '} (' . implode(', ', $insert_fields) . ') ' . $this->fromQuery;
|
|
}
|
|
|
|
// For simplicity, we will use the $placeholders array to inject
|
|
// default keywords even though they are not, strictly speaking,
|
|
// placeholders for prepared statements.
|
|
$placeholders = array();
|
|
$placeholders = array_pad($placeholders, count($this->defaultFields), 'default');
|
|
$placeholders = array_pad($placeholders, count($this->insertFields), '?');
|
|
|
|
return $comments . 'INSERT INTO {' . $this->table . '} (' . implode(', ', $insert_fields) . ') VALUES (' . implode(', ', $placeholders) . ')';
|
|
}
|
|
|
|
/**
|
|
* Preprocesses and validates the query.
|
|
*
|
|
* @return
|
|
* TRUE if the validation was successful, FALSE if not.
|
|
*
|
|
* @throws FieldsOverlapException
|
|
* @throws NoFieldsException
|
|
*/
|
|
public function preExecute() {
|
|
// Confirm that the user did not try to specify an identical
|
|
// field and default field.
|
|
if (array_intersect($this->insertFields, $this->defaultFields)) {
|
|
throw new FieldsOverlapException('You may not specify the same field to have a value and a schema-default value.');
|
|
}
|
|
|
|
if (!empty($this->fromQuery)) {
|
|
// We have to assume that the used aliases match the insert fields.
|
|
// Regular fields are added to the query before expressions, maintain the
|
|
// same order for the insert fields.
|
|
// This behavior can be overridden by calling fields() manually as only the
|
|
// first call to fields() does have an effect.
|
|
$this->fields(array_merge(array_keys($this->fromQuery->getFields()), array_keys($this->fromQuery->getExpressions())));
|
|
}
|
|
else {
|
|
// Don't execute query without fields.
|
|
if (count($this->insertFields) + count($this->defaultFields) == 0) {
|
|
throw new NoFieldsException('There are no fields available to insert with.');
|
|
}
|
|
}
|
|
|
|
// If no values have been added, silently ignore this query. This can happen
|
|
// if values are added conditionally, so we don't want to throw an
|
|
// exception.
|
|
if (!isset($this->insertValues[0]) && count($this->insertFields) > 0 && empty($this->fromQuery)) {
|
|
return FALSE;
|
|
}
|
|
return TRUE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* General class for an abstracted DELETE operation.
|
|
*/
|
|
class DeleteQuery extends Query implements QueryConditionInterface {
|
|
|
|
/**
|
|
* The table from which to delete.
|
|
*
|
|
* @var string
|
|
*/
|
|
protected $table;
|
|
|
|
/**
|
|
* The condition object for this query.
|
|
*
|
|
* Condition handling is handled via composition.
|
|
*
|
|
* @var DatabaseCondition
|
|
*/
|
|
protected $condition;
|
|
|
|
/**
|
|
* Constructs a DeleteQuery object.
|
|
*
|
|
* @param DatabaseConnection $connection
|
|
* A DatabaseConnection object.
|
|
* @param string $table
|
|
* Name of the table to associate with this query.
|
|
* @param array $options
|
|
* Array of database options.
|
|
*/
|
|
public function __construct(DatabaseConnection $connection, $table, array $options = array()) {
|
|
$options['return'] = Database::RETURN_AFFECTED;
|
|
parent::__construct($connection, $options);
|
|
$this->table = $table;
|
|
|
|
$this->condition = new DatabaseCondition('AND');
|
|
}
|
|
|
|
/**
|
|
* Implements QueryConditionInterface::condition().
|
|
*/
|
|
public function condition($field, $value = NULL, $operator = NULL) {
|
|
$this->condition->condition($field, $value, $operator);
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Implements QueryConditionInterface::isNull().
|
|
*/
|
|
public function isNull($field) {
|
|
$this->condition->isNull($field);
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Implements QueryConditionInterface::isNotNull().
|
|
*/
|
|
public function isNotNull($field) {
|
|
$this->condition->isNotNull($field);
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Implements QueryConditionInterface::exists().
|
|
*/
|
|
public function exists(SelectQueryInterface $select) {
|
|
$this->condition->exists($select);
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Implements QueryConditionInterface::notExists().
|
|
*/
|
|
public function notExists(SelectQueryInterface $select) {
|
|
$this->condition->notExists($select);
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Implements QueryConditionInterface::conditions().
|
|
*/
|
|
public function &conditions() {
|
|
return $this->condition->conditions();
|
|
}
|
|
|
|
/**
|
|
* Implements QueryConditionInterface::arguments().
|
|
*/
|
|
public function arguments() {
|
|
return $this->condition->arguments();
|
|
}
|
|
|
|
/**
|
|
* Implements QueryConditionInterface::where().
|
|
*/
|
|
public function where($snippet, $args = array()) {
|
|
$this->condition->where($snippet, $args);
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Implements QueryConditionInterface::compile().
|
|
*/
|
|
public function compile(DatabaseConnection $connection, QueryPlaceholderInterface $queryPlaceholder) {
|
|
return $this->condition->compile($connection, $queryPlaceholder);
|
|
}
|
|
|
|
/**
|
|
* Implements QueryConditionInterface::compiled().
|
|
*/
|
|
public function compiled() {
|
|
return $this->condition->compiled();
|
|
}
|
|
|
|
/**
|
|
* Executes the DELETE query.
|
|
*
|
|
* @return int
|
|
* The number of rows affected by the delete query.
|
|
*/
|
|
public function execute() {
|
|
$values = array();
|
|
if (count($this->condition)) {
|
|
$this->condition->compile($this->connection, $this);
|
|
$values = $this->condition->arguments();
|
|
}
|
|
|
|
return $this->connection->query((string) $this, $values, $this->queryOptions);
|
|
}
|
|
|
|
/**
|
|
* Implements PHP magic __toString method to convert the query to a string.
|
|
*
|
|
* @return string
|
|
* The prepared statement.
|
|
*/
|
|
public function __toString() {
|
|
// Create a sanitized comment string to prepend to the query.
|
|
$comments = $this->connection->makeComment($this->comments);
|
|
|
|
$query = $comments . 'DELETE FROM {' . $this->connection->escapeTable($this->table) . '} ';
|
|
|
|
if (count($this->condition)) {
|
|
|
|
$this->condition->compile($this->connection, $this);
|
|
$query .= "\nWHERE " . $this->condition;
|
|
}
|
|
|
|
return $query;
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* General class for an abstracted TRUNCATE operation.
|
|
*/
|
|
class TruncateQuery extends Query {
|
|
|
|
/**
|
|
* The table to truncate.
|
|
*
|
|
* @var string
|
|
*/
|
|
protected $table;
|
|
|
|
/**
|
|
* Constructs a TruncateQuery object.
|
|
*
|
|
* @param DatabaseConnection $connection
|
|
* A DatabaseConnection object.
|
|
* @param string $table
|
|
* Name of the table to associate with this query.
|
|
* @param array $options
|
|
* Array of database options.
|
|
*/
|
|
public function __construct(DatabaseConnection $connection, $table, array $options = array()) {
|
|
$options['return'] = Database::RETURN_AFFECTED;
|
|
parent::__construct($connection, $options);
|
|
$this->table = $table;
|
|
}
|
|
|
|
/**
|
|
* Implements QueryConditionInterface::compile().
|
|
*/
|
|
public function compile(DatabaseConnection $connection, QueryPlaceholderInterface $queryPlaceholder) {
|
|
return $this->condition->compile($connection, $queryPlaceholder);
|
|
}
|
|
|
|
/**
|
|
* Implements QueryConditionInterface::compiled().
|
|
*/
|
|
public function compiled() {
|
|
return $this->condition->compiled();
|
|
}
|
|
|
|
/**
|
|
* Executes the TRUNCATE query.
|
|
*
|
|
* @return
|
|
* Return value is dependent on the database type.
|
|
*/
|
|
public function execute() {
|
|
return $this->connection->query((string) $this, array(), $this->queryOptions);
|
|
}
|
|
|
|
/**
|
|
* Implements PHP magic __toString method to convert the query to a string.
|
|
*
|
|
* @return string
|
|
* The prepared statement.
|
|
*/
|
|
public function __toString() {
|
|
// Create a sanitized comment string to prepend to the query.
|
|
$comments = $this->connection->makeComment($this->comments);
|
|
|
|
// In most cases, TRUNCATE is not a transaction safe statement as it is a
|
|
// DDL statement which results in an implicit COMMIT. When we are in a
|
|
// transaction, fallback to the slower, but transactional, DELETE.
|
|
// PostgreSQL also locks the entire table for a TRUNCATE strongly reducing
|
|
// the concurrency with other transactions.
|
|
if ($this->connection->inTransaction()) {
|
|
return $comments . 'DELETE FROM {' . $this->connection->escapeTable($this->table) . '}';
|
|
}
|
|
else {
|
|
return $comments . 'TRUNCATE {' . $this->connection->escapeTable($this->table) . '} ';
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* General class for an abstracted UPDATE operation.
|
|
*/
|
|
class UpdateQuery extends Query implements QueryConditionInterface {
|
|
|
|
/**
|
|
* The table to update.
|
|
*
|
|
* @var string
|
|
*/
|
|
protected $table;
|
|
|
|
/**
|
|
* An array of fields that will be updated.
|
|
*
|
|
* @var array
|
|
*/
|
|
protected $fields = array();
|
|
|
|
/**
|
|
* An array of values to update to.
|
|
*
|
|
* @var array
|
|
*/
|
|
protected $arguments = array();
|
|
|
|
/**
|
|
* The condition object for this query.
|
|
*
|
|
* Condition handling is handled via composition.
|
|
*
|
|
* @var DatabaseCondition
|
|
*/
|
|
protected $condition;
|
|
|
|
/**
|
|
* Array of fields to update to an expression in case of a duplicate record.
|
|
*
|
|
* This variable is a nested array in the following format:
|
|
* @code
|
|
* <some field> => array(
|
|
* 'condition' => <condition to execute, as a string>,
|
|
* 'arguments' => <array of arguments for condition, or NULL for none>,
|
|
* );
|
|
* @endcode
|
|
*
|
|
* @var array
|
|
*/
|
|
protected $expressionFields = array();
|
|
|
|
/**
|
|
* Constructs an UpdateQuery object.
|
|
*
|
|
* @param DatabaseConnection $connection
|
|
* A DatabaseConnection object.
|
|
* @param string $table
|
|
* Name of the table to associate with this query.
|
|
* @param array $options
|
|
* Array of database options.
|
|
*/
|
|
public function __construct(DatabaseConnection $connection, $table, array $options = array()) {
|
|
$options['return'] = Database::RETURN_AFFECTED;
|
|
parent::__construct($connection, $options);
|
|
$this->table = $table;
|
|
|
|
$this->condition = new DatabaseCondition('AND');
|
|
}
|
|
|
|
/**
|
|
* Implements QueryConditionInterface::condition().
|
|
*/
|
|
public function condition($field, $value = NULL, $operator = NULL) {
|
|
$this->condition->condition($field, $value, $operator);
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Implements QueryConditionInterface::isNull().
|
|
*/
|
|
public function isNull($field) {
|
|
$this->condition->isNull($field);
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Implements QueryConditionInterface::isNotNull().
|
|
*/
|
|
public function isNotNull($field) {
|
|
$this->condition->isNotNull($field);
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Implements QueryConditionInterface::exists().
|
|
*/
|
|
public function exists(SelectQueryInterface $select) {
|
|
$this->condition->exists($select);
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Implements QueryConditionInterface::notExists().
|
|
*/
|
|
public function notExists(SelectQueryInterface $select) {
|
|
$this->condition->notExists($select);
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Implements QueryConditionInterface::conditions().
|
|
*/
|
|
public function &conditions() {
|
|
return $this->condition->conditions();
|
|
}
|
|
|
|
/**
|
|
* Implements QueryConditionInterface::arguments().
|
|
*/
|
|
public function arguments() {
|
|
return $this->condition->arguments();
|
|
}
|
|
|
|
/**
|
|
* Implements QueryConditionInterface::where().
|
|
*/
|
|
public function where($snippet, $args = array()) {
|
|
$this->condition->where($snippet, $args);
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Implements QueryConditionInterface::compile().
|
|
*/
|
|
public function compile(DatabaseConnection $connection, QueryPlaceholderInterface $queryPlaceholder) {
|
|
return $this->condition->compile($connection, $queryPlaceholder);
|
|
}
|
|
|
|
/**
|
|
* Implements QueryConditionInterface::compiled().
|
|
*/
|
|
public function compiled() {
|
|
return $this->condition->compiled();
|
|
}
|
|
|
|
/**
|
|
* Adds a set of field->value pairs to be updated.
|
|
*
|
|
* @param $fields
|
|
* An associative array of fields to write into the database. The array keys
|
|
* are the field names and the values are the values to which to set them.
|
|
*
|
|
* @return UpdateQuery
|
|
* The called object.
|
|
*/
|
|
public function fields(array $fields) {
|
|
$this->fields = $fields;
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Specifies fields to be updated as an expression.
|
|
*
|
|
* Expression fields are cases such as counter=counter+1. This method takes
|
|
* precedence over fields().
|
|
*
|
|
* @param $field
|
|
* The field to set.
|
|
* @param $expression
|
|
* The field will be set to the value of this expression. This parameter
|
|
* may include named placeholders.
|
|
* @param $arguments
|
|
* If specified, this is an array of key/value pairs for named placeholders
|
|
* corresponding to the expression.
|
|
*
|
|
* @return UpdateQuery
|
|
* The called object.
|
|
*/
|
|
public function expression($field, $expression, array $arguments = NULL) {
|
|
$this->expressionFields[$field] = array(
|
|
'expression' => $expression,
|
|
'arguments' => $arguments,
|
|
);
|
|
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Executes the UPDATE query.
|
|
*
|
|
* @return
|
|
* The number of rows affected by the update.
|
|
*/
|
|
public function execute() {
|
|
|
|
// Expressions take priority over literal fields, so we process those first
|
|
// and remove any literal fields that conflict.
|
|
$fields = $this->fields;
|
|
$update_values = array();
|
|
foreach ($this->expressionFields as $field => $data) {
|
|
if (!empty($data['arguments'])) {
|
|
$update_values += $data['arguments'];
|
|
}
|
|
unset($fields[$field]);
|
|
}
|
|
|
|
// Because we filter $fields the same way here and in __toString(), the
|
|
// placeholders will all match up properly.
|
|
$max_placeholder = 0;
|
|
foreach ($fields as $field => $value) {
|
|
$update_values[':db_update_placeholder_' . ($max_placeholder++)] = $value;
|
|
}
|
|
|
|
if (count($this->condition)) {
|
|
$this->condition->compile($this->connection, $this);
|
|
$update_values = array_merge($update_values, $this->condition->arguments());
|
|
}
|
|
|
|
return $this->connection->query((string) $this, $update_values, $this->queryOptions);
|
|
}
|
|
|
|
/**
|
|
* Implements PHP magic __toString method to convert the query to a string.
|
|
*
|
|
* @return string
|
|
* The prepared statement.
|
|
*/
|
|
public function __toString() {
|
|
// Create a sanitized comment string to prepend to the query.
|
|
$comments = $this->connection->makeComment($this->comments);
|
|
|
|
// Expressions take priority over literal fields, so we process those first
|
|
// and remove any literal fields that conflict.
|
|
$fields = $this->fields;
|
|
$update_fields = array();
|
|
foreach ($this->expressionFields as $field => $data) {
|
|
$update_fields[] = $field . '=' . $data['expression'];
|
|
unset($fields[$field]);
|
|
}
|
|
|
|
$max_placeholder = 0;
|
|
foreach ($fields as $field => $value) {
|
|
$update_fields[] = $field . '=:db_update_placeholder_' . ($max_placeholder++);
|
|
}
|
|
|
|
$query = $comments . 'UPDATE {' . $this->connection->escapeTable($this->table) . '} SET ' . implode(', ', $update_fields);
|
|
|
|
if (count($this->condition)) {
|
|
$this->condition->compile($this->connection, $this);
|
|
// There is an implicit string cast on $this->condition.
|
|
$query .= "\nWHERE " . $this->condition;
|
|
}
|
|
|
|
return $query;
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* General class for an abstracted MERGE query operation.
|
|
*
|
|
* An ANSI SQL:2003 compatible database would run the following query:
|
|
*
|
|
* @code
|
|
* MERGE INTO table_name_1 USING table_name_2 ON (condition)
|
|
* WHEN MATCHED THEN
|
|
* UPDATE SET column1 = value1 [, column2 = value2 ...]
|
|
* WHEN NOT MATCHED THEN
|
|
* INSERT (column1 [, column2 ...]) VALUES (value1 [, value2 ...
|
|
* @endcode
|
|
*
|
|
* Other databases (most notably MySQL, PostgreSQL and SQLite) will emulate
|
|
* this statement by running a SELECT and then INSERT or UPDATE.
|
|
*
|
|
* By default, the two table names are identical and they are passed into the
|
|
* the constructor. table_name_2 can be specified by the
|
|
* MergeQuery::conditionTable() method. It can be either a string or a
|
|
* subquery.
|
|
*
|
|
* The condition is built exactly like SelectQuery or UpdateQuery conditions,
|
|
* the UPDATE query part is built similarly like an UpdateQuery and finally the
|
|
* INSERT query part is built similarly like an InsertQuery. However, both
|
|
* UpdateQuery and InsertQuery has a fields method so
|
|
* MergeQuery::updateFields() and MergeQuery::insertFields() needs to be called
|
|
* instead. MergeQuery::fields() can also be called which calls both of these
|
|
* methods as the common case is to use the same column-value pairs for both
|
|
* INSERT and UPDATE. However, this is not mandatory. Another convenient
|
|
* wrapper is MergeQuery::key() which adds the same column-value pairs to the
|
|
* condition and the INSERT query part.
|
|
*
|
|
* Several methods (key(), fields(), insertFields()) can be called to set a
|
|
* key-value pair for the INSERT query part. Subsequent calls for the same
|
|
* fields override the earlier ones. The same is true for UPDATE and key(),
|
|
* fields() and updateFields().
|
|
*/
|
|
class MergeQuery extends Query implements QueryConditionInterface {
|
|
/**
|
|
* Returned by execute() if an INSERT query has been executed.
|
|
*/
|
|
const STATUS_INSERT = 1;
|
|
|
|
/**
|
|
* Returned by execute() if an UPDATE query has been executed.
|
|
*/
|
|
const STATUS_UPDATE = 2;
|
|
|
|
/**
|
|
* The table to be used for INSERT and UPDATE.
|
|
*
|
|
* @var string
|
|
*/
|
|
protected $table;
|
|
|
|
/**
|
|
* The table or subquery to be used for the condition.
|
|
*/
|
|
protected $conditionTable;
|
|
|
|
/**
|
|
* An array of fields on which to insert.
|
|
*
|
|
* @var array
|
|
*/
|
|
protected $insertFields = array();
|
|
|
|
/**
|
|
* An array of fields which should be set to their database-defined defaults.
|
|
*
|
|
* Used on INSERT.
|
|
*
|
|
* @var array
|
|
*/
|
|
protected $defaultFields = array();
|
|
|
|
/**
|
|
* An array of values to be inserted.
|
|
*
|
|
* @var string
|
|
*/
|
|
protected $insertValues = array();
|
|
|
|
/**
|
|
* An array of fields that will be updated.
|
|
*
|
|
* @var array
|
|
*/
|
|
protected $updateFields = array();
|
|
|
|
/**
|
|
* Array of fields to update to an expression in case of a duplicate record.
|
|
*
|
|
* This variable is a nested array in the following format:
|
|
* @code
|
|
* <some field> => array(
|
|
* 'condition' => <condition to execute, as a string>,
|
|
* 'arguments' => <array of arguments for condition, or NULL for none>,
|
|
* );
|
|
* @endcode
|
|
*
|
|
* @var array
|
|
*/
|
|
protected $expressionFields = array();
|
|
|
|
/**
|
|
* Flag indicating whether an UPDATE is necessary.
|
|
*
|
|
* @var boolean
|
|
*/
|
|
protected $needsUpdate = FALSE;
|
|
|
|
/**
|
|
* Constructs a MergeQuery object.
|
|
*
|
|
* @param DatabaseConnection $connection
|
|
* A DatabaseConnection object.
|
|
* @param string $table
|
|
* Name of the table to associate with this query.
|
|
* @param array $options
|
|
* Array of database options.
|
|
*/
|
|
public function __construct(DatabaseConnection $connection, $table, array $options = array()) {
|
|
$options['return'] = Database::RETURN_AFFECTED;
|
|
parent::__construct($connection, $options);
|
|
$this->table = $table;
|
|
$this->conditionTable = $table;
|
|
$this->condition = new DatabaseCondition('AND');
|
|
}
|
|
|
|
/**
|
|
* Sets the table or subquery to be used for the condition.
|
|
*
|
|
* @param $table
|
|
* The table name or the subquery to be used. Use a SelectQuery object to
|
|
* pass in a subquery.
|
|
*
|
|
* @return MergeQuery
|
|
* The called object.
|
|
*/
|
|
protected function conditionTable($table) {
|
|
$this->conditionTable = $table;
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Adds a set of field->value pairs to be updated.
|
|
*
|
|
* @param $fields
|
|
* An associative array of fields to write into the database. The array keys
|
|
* are the field names and the values are the values to which to set them.
|
|
*
|
|
* @return MergeQuery
|
|
* The called object.
|
|
*/
|
|
public function updateFields(array $fields) {
|
|
$this->updateFields = $fields;
|
|
$this->needsUpdate = TRUE;
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Specifies fields to be updated as an expression.
|
|
*
|
|
* Expression fields are cases such as counter = counter + 1. This method
|
|
* takes precedence over MergeQuery::updateFields() and it's wrappers,
|
|
* MergeQuery::key() and MergeQuery::fields().
|
|
*
|
|
* @param $field
|
|
* The field to set.
|
|
* @param $expression
|
|
* The field will be set to the value of this expression. This parameter
|
|
* may include named placeholders.
|
|
* @param $arguments
|
|
* If specified, this is an array of key/value pairs for named placeholders
|
|
* corresponding to the expression.
|
|
*
|
|
* @return MergeQuery
|
|
* The called object.
|
|
*/
|
|
public function expression($field, $expression, array $arguments = NULL) {
|
|
$this->expressionFields[$field] = array(
|
|
'expression' => $expression,
|
|
'arguments' => $arguments,
|
|
);
|
|
$this->needsUpdate = TRUE;
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Adds a set of field->value pairs to be inserted.
|
|
*
|
|
* @param $fields
|
|
* An array of fields on which to insert. This array may be indexed or
|
|
* associative. If indexed, the array is taken to be the list of fields.
|
|
* If associative, the keys of the array are taken to be the fields and
|
|
* the values are taken to be corresponding values to insert. If a
|
|
* $values argument is provided, $fields must be indexed.
|
|
* @param $values
|
|
* An array of fields to insert into the database. The values must be
|
|
* specified in the same order as the $fields array.
|
|
*
|
|
* @return MergeQuery
|
|
* The called object.
|
|
*/
|
|
public function insertFields(array $fields, array $values = array()) {
|
|
if ($values) {
|
|
$fields = array_combine($fields, $values);
|
|
}
|
|
$this->insertFields = $fields;
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Specifies fields for which the database-defaults should be used.
|
|
*
|
|
* If you want to force a given field to use the database-defined default,
|
|
* not NULL or undefined, use this method to instruct the database to use
|
|
* default values explicitly. In most cases this will not be necessary
|
|
* unless you are inserting a row that is all default values, as you cannot
|
|
* specify no values in an INSERT query.
|
|
*
|
|
* Specifying a field both in fields() and in useDefaults() is an error
|
|
* and will not execute.
|
|
*
|
|
* @param $fields
|
|
* An array of values for which to use the default values
|
|
* specified in the table definition.
|
|
*
|
|
* @return MergeQuery
|
|
* The called object.
|
|
*/
|
|
public function useDefaults(array $fields) {
|
|
$this->defaultFields = $fields;
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Sets common field-value pairs in the INSERT and UPDATE query parts.
|
|
*
|
|
* This method should only be called once. It may be called either
|
|
* with a single associative array or two indexed arrays. If called
|
|
* with an associative array, the keys are taken to be the fields
|
|
* and the values are taken to be the corresponding values to set.
|
|
* If called with two arrays, the first array is taken as the fields
|
|
* and the second array is taken as the corresponding values.
|
|
*
|
|
* @param $fields
|
|
* An array of fields to insert, or an associative array of fields and
|
|
* values. The keys of the array are taken to be the fields and the values
|
|
* are taken to be corresponding values to insert.
|
|
* @param $values
|
|
* An array of values to set into the database. The values must be
|
|
* specified in the same order as the $fields array.
|
|
*
|
|
* @return MergeQuery
|
|
* The called object.
|
|
*/
|
|
public function fields(array $fields, array $values = array()) {
|
|
if ($values) {
|
|
$fields = array_combine($fields, $values);
|
|
}
|
|
foreach ($fields as $key => $value) {
|
|
$this->insertFields[$key] = $value;
|
|
$this->updateFields[$key] = $value;
|
|
}
|
|
$this->needsUpdate = TRUE;
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Sets the key field(s) to be used as conditions for this query.
|
|
*
|
|
* This method should only be called once. It may be called either
|
|
* with a single associative array or two indexed arrays. If called
|
|
* with an associative array, the keys are taken to be the fields
|
|
* and the values are taken to be the corresponding values to set.
|
|
* If called with two arrays, the first array is taken as the fields
|
|
* and the second array is taken as the corresponding values.
|
|
*
|
|
* The fields are copied to the condition of the query and the INSERT part.
|
|
* If no other method is called, the UPDATE will become a no-op.
|
|
*
|
|
* @param $fields
|
|
* An array of fields to set, or an associative array of fields and values.
|
|
* @param $values
|
|
* An array of values to set into the database. The values must be
|
|
* specified in the same order as the $fields array.
|
|
*
|
|
* @return MergeQuery
|
|
* The called object.
|
|
*/
|
|
public function key(array $fields, array $values = array()) {
|
|
if ($values) {
|
|
$fields = array_combine($fields, $values);
|
|
}
|
|
foreach ($fields as $key => $value) {
|
|
$this->insertFields[$key] = $value;
|
|
$this->condition($key, $value);
|
|
}
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Implements QueryConditionInterface::condition().
|
|
*/
|
|
public function condition($field, $value = NULL, $operator = NULL) {
|
|
$this->condition->condition($field, $value, $operator);
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Implements QueryConditionInterface::isNull().
|
|
*/
|
|
public function isNull($field) {
|
|
$this->condition->isNull($field);
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Implements QueryConditionInterface::isNotNull().
|
|
*/
|
|
public function isNotNull($field) {
|
|
$this->condition->isNotNull($field);
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Implements QueryConditionInterface::exists().
|
|
*/
|
|
public function exists(SelectQueryInterface $select) {
|
|
$this->condition->exists($select);
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Implements QueryConditionInterface::notExists().
|
|
*/
|
|
public function notExists(SelectQueryInterface $select) {
|
|
$this->condition->notExists($select);
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Implements QueryConditionInterface::conditions().
|
|
*/
|
|
public function &conditions() {
|
|
return $this->condition->conditions();
|
|
}
|
|
|
|
/**
|
|
* Implements QueryConditionInterface::arguments().
|
|
*/
|
|
public function arguments() {
|
|
return $this->condition->arguments();
|
|
}
|
|
|
|
/**
|
|
* Implements QueryConditionInterface::where().
|
|
*/
|
|
public function where($snippet, $args = array()) {
|
|
$this->condition->where($snippet, $args);
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Implements QueryConditionInterface::compile().
|
|
*/
|
|
public function compile(DatabaseConnection $connection, QueryPlaceholderInterface $queryPlaceholder) {
|
|
return $this->condition->compile($connection, $queryPlaceholder);
|
|
}
|
|
|
|
/**
|
|
* Implements QueryConditionInterface::compiled().
|
|
*/
|
|
public function compiled() {
|
|
return $this->condition->compiled();
|
|
}
|
|
|
|
/**
|
|
* Implements PHP magic __toString method to convert the query to a string.
|
|
*
|
|
* In the degenerate case, there is no string-able query as this operation
|
|
* is potentially two queries.
|
|
*
|
|
* @return string
|
|
* The prepared query statement.
|
|
*/
|
|
public function __toString() {
|
|
}
|
|
|
|
public function execute() {
|
|
if (!count($this->condition)) {
|
|
throw new InvalidMergeQueryException(t('Invalid merge query: no conditions'));
|
|
}
|
|
$select = $this->connection->select($this->conditionTable)
|
|
->condition($this->condition);
|
|
$select->addExpression('1');
|
|
if (!$select->execute()->fetchField()) {
|
|
try {
|
|
$insert = $this->connection->insert($this->table)->fields($this->insertFields);
|
|
if ($this->defaultFields) {
|
|
$insert->useDefaults($this->defaultFields);
|
|
}
|
|
$insert->execute();
|
|
return self::STATUS_INSERT;
|
|
}
|
|
catch (Exception $e) {
|
|
// The insert query failed, maybe it's because a racing insert query
|
|
// beat us in inserting the same row. Retry the select query, if it
|
|
// returns a row, ignore the error and continue with the update
|
|
// query below.
|
|
if (!$select->execute()->fetchField()) {
|
|
throw $e;
|
|
}
|
|
}
|
|
}
|
|
if ($this->needsUpdate) {
|
|
$update = $this->connection->update($this->table)
|
|
->fields($this->updateFields)
|
|
->condition($this->condition);
|
|
if ($this->expressionFields) {
|
|
foreach ($this->expressionFields as $field => $data) {
|
|
$update->expression($field, $data['expression'], $data['arguments']);
|
|
}
|
|
}
|
|
$update->execute();
|
|
return self::STATUS_UPDATE;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Generic class for a series of conditions in a query.
|
|
*/
|
|
class DatabaseCondition implements QueryConditionInterface, Countable {
|
|
|
|
/**
|
|
* Array of conditions.
|
|
*
|
|
* @var array
|
|
*/
|
|
protected $conditions = array();
|
|
|
|
/**
|
|
* Array of arguments.
|
|
*
|
|
* @var array
|
|
*/
|
|
protected $arguments = array();
|
|
|
|
/**
|
|
* Whether the conditions have been changed.
|
|
*
|
|
* TRUE if the condition has been changed since the last compile.
|
|
* FALSE if the condition has been compiled and not changed.
|
|
*
|
|
* @var bool
|
|
*/
|
|
protected $changed = TRUE;
|
|
|
|
/**
|
|
* The identifier of the query placeholder this condition has been compiled against.
|
|
*/
|
|
protected $queryPlaceholderIdentifier;
|
|
|
|
/**
|
|
* Constructs a DataBaseCondition object.
|
|
*
|
|
* @param string $conjunction
|
|
* The operator to use to combine conditions: 'AND' or 'OR'.
|
|
*/
|
|
public function __construct($conjunction) {
|
|
$this->conditions['#conjunction'] = $conjunction;
|
|
}
|
|
|
|
/**
|
|
* Implements Countable::count().
|
|
*
|
|
* Returns the size of this conditional. The size of the conditional is the
|
|
* size of its conditional array minus one, because one element is the
|
|
* conjunction.
|
|
*/
|
|
public function count() {
|
|
return count($this->conditions) - 1;
|
|
}
|
|
|
|
/**
|
|
* Implements QueryConditionInterface::condition().
|
|
*/
|
|
public function condition($field, $value = NULL, $operator = NULL) {
|
|
if (!isset($operator)) {
|
|
if (is_array($value)) {
|
|
$operator = 'IN';
|
|
}
|
|
elseif (!isset($value)) {
|
|
$operator = 'IS NULL';
|
|
}
|
|
else {
|
|
$operator = '=';
|
|
}
|
|
}
|
|
$this->conditions[] = array(
|
|
'field' => $field,
|
|
'value' => $value,
|
|
'operator' => $operator,
|
|
);
|
|
|
|
$this->changed = TRUE;
|
|
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Implements QueryConditionInterface::where().
|
|
*/
|
|
public function where($snippet, $args = array()) {
|
|
$this->conditions[] = array(
|
|
'field' => $snippet,
|
|
'value' => $args,
|
|
'operator' => NULL,
|
|
);
|
|
$this->changed = TRUE;
|
|
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Implements QueryConditionInterface::isNull().
|
|
*/
|
|
public function isNull($field) {
|
|
return $this->condition($field);
|
|
}
|
|
|
|
/**
|
|
* Implements QueryConditionInterface::isNotNull().
|
|
*/
|
|
public function isNotNull($field) {
|
|
return $this->condition($field, NULL, 'IS NOT NULL');
|
|
}
|
|
|
|
/**
|
|
* Implements QueryConditionInterface::exists().
|
|
*/
|
|
public function exists(SelectQueryInterface $select) {
|
|
return $this->condition('', $select, 'EXISTS');
|
|
}
|
|
|
|
/**
|
|
* Implements QueryConditionInterface::notExists().
|
|
*/
|
|
public function notExists(SelectQueryInterface $select) {
|
|
return $this->condition('', $select, 'NOT EXISTS');
|
|
}
|
|
|
|
/**
|
|
* Implements QueryConditionInterface::conditions().
|
|
*/
|
|
public function &conditions() {
|
|
return $this->conditions;
|
|
}
|
|
|
|
/**
|
|
* Implements QueryConditionInterface::arguments().
|
|
*/
|
|
public function arguments() {
|
|
// If the caller forgot to call compile() first, refuse to run.
|
|
if ($this->changed) {
|
|
return NULL;
|
|
}
|
|
return $this->arguments;
|
|
}
|
|
|
|
/**
|
|
* Implements QueryConditionInterface::compile().
|
|
*/
|
|
public function compile(DatabaseConnection $connection, QueryPlaceholderInterface $queryPlaceholder) {
|
|
// Re-compile if this condition changed or if we are compiled against a
|
|
// different query placeholder object.
|
|
if ($this->changed || isset($this->queryPlaceholderIdentifier) && ($this->queryPlaceholderIdentifier != $queryPlaceholder->uniqueIdentifier())) {
|
|
$this->queryPlaceholderIdentifier = $queryPlaceholder->uniqueIdentifier();
|
|
|
|
$condition_fragments = array();
|
|
$arguments = array();
|
|
|
|
$conditions = $this->conditions;
|
|
$conjunction = $conditions['#conjunction'];
|
|
unset($conditions['#conjunction']);
|
|
foreach ($conditions as $condition) {
|
|
if (empty($condition['operator'])) {
|
|
// This condition is a literal string, so let it through as is.
|
|
$condition_fragments[] = ' (' . $condition['field'] . ') ';
|
|
$arguments += $condition['value'];
|
|
}
|
|
else {
|
|
// It's a structured condition, so parse it out accordingly.
|
|
// Note that $condition['field'] will only be an object for a dependent
|
|
// DatabaseCondition object, not for a dependent subquery.
|
|
if ($condition['field'] instanceof QueryConditionInterface) {
|
|
// Compile the sub-condition recursively and add it to the list.
|
|
$condition['field']->compile($connection, $queryPlaceholder);
|
|
$condition_fragments[] = '(' . (string) $condition['field'] . ')';
|
|
$arguments += $condition['field']->arguments();
|
|
}
|
|
else {
|
|
// For simplicity, we treat all operators as the same data structure.
|
|
// In the typical degenerate case, this won't get changed.
|
|
$operator_defaults = array(
|
|
'prefix' => '',
|
|
'postfix' => '',
|
|
'delimiter' => '',
|
|
'operator' => $condition['operator'],
|
|
'use_value' => TRUE,
|
|
);
|
|
$operator = $connection->mapConditionOperator($condition['operator']);
|
|
if (!isset($operator)) {
|
|
$operator = $this->mapConditionOperator($condition['operator']);
|
|
}
|
|
$operator += $operator_defaults;
|
|
|
|
$placeholders = array();
|
|
if ($condition['value'] instanceof SelectQueryInterface) {
|
|
$condition['value']->compile($connection, $queryPlaceholder);
|
|
$placeholders[] = (string) $condition['value'];
|
|
$arguments += $condition['value']->arguments();
|
|
// Subqueries are the actual value of the operator, we don't
|
|
// need to add another below.
|
|
$operator['use_value'] = FALSE;
|
|
}
|
|
// We assume that if there is a delimiter, then the value is an
|
|
// array. If not, it is a scalar. For simplicity, we first convert
|
|
// up to an array so that we can build the placeholders in the same way.
|
|
elseif (!$operator['delimiter']) {
|
|
$condition['value'] = array($condition['value']);
|
|
}
|
|
if ($operator['use_value']) {
|
|
foreach ($condition['value'] as $value) {
|
|
$placeholder = ':db_condition_placeholder_' . $queryPlaceholder->nextPlaceholder();
|
|
$arguments[$placeholder] = $value;
|
|
$placeholders[] = $placeholder;
|
|
}
|
|
}
|
|
$condition_fragments[] = ' (' . $connection->escapeField($condition['field']) . ' ' . $operator['operator'] . ' ' . $operator['prefix'] . implode($operator['delimiter'], $placeholders) . $operator['postfix'] . ') ';
|
|
}
|
|
}
|
|
}
|
|
|
|
$this->changed = FALSE;
|
|
$this->stringVersion = implode($conjunction, $condition_fragments);
|
|
$this->arguments = $arguments;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Implements QueryConditionInterface::compiled().
|
|
*/
|
|
public function compiled() {
|
|
return !$this->changed;
|
|
}
|
|
|
|
/**
|
|
* Implements PHP magic __toString method to convert the conditions to string.
|
|
*
|
|
* @return string
|
|
* A string version of the conditions.
|
|
*/
|
|
public function __toString() {
|
|
// If the caller forgot to call compile() first, refuse to run.
|
|
if ($this->changed) {
|
|
return NULL;
|
|
}
|
|
return $this->stringVersion;
|
|
}
|
|
|
|
/**
|
|
* PHP magic __clone() method.
|
|
*
|
|
* Only copies fields that implement QueryConditionInterface. Also sets
|
|
* $this->changed to TRUE.
|
|
*/
|
|
function __clone() {
|
|
$this->changed = TRUE;
|
|
foreach ($this->conditions as $key => $condition) {
|
|
if ($key !== '#conjunction') {
|
|
if ($condition['field'] instanceOf QueryConditionInterface) {
|
|
$this->conditions[$key]['field'] = clone($condition['field']);
|
|
}
|
|
if ($condition['value'] instanceOf SelectQueryInterface) {
|
|
$this->conditions[$key]['value'] = clone($condition['value']);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Gets any special processing requirements for the condition operator.
|
|
*
|
|
* Some condition types require special processing, such as IN, because
|
|
* the value data they pass in is not a simple value. This is a simple
|
|
* overridable lookup function.
|
|
*
|
|
* @param $operator
|
|
* The condition operator, such as "IN", "BETWEEN", etc. Case-sensitive.
|
|
*
|
|
* @return
|
|
* The extra handling directives for the specified operator, or NULL.
|
|
*/
|
|
protected function mapConditionOperator($operator) {
|
|
// $specials does not use drupal_static as its value never changes.
|
|
static $specials = array(
|
|
'BETWEEN' => array('delimiter' => ' AND '),
|
|
'IN' => array('delimiter' => ', ', 'prefix' => ' (', 'postfix' => ')'),
|
|
'NOT IN' => array('delimiter' => ', ', 'prefix' => ' (', 'postfix' => ')'),
|
|
'EXISTS' => array('prefix' => ' (', 'postfix' => ')'),
|
|
'NOT EXISTS' => array('prefix' => ' (', 'postfix' => ')'),
|
|
'IS NULL' => array('use_value' => FALSE),
|
|
'IS NOT NULL' => array('use_value' => FALSE),
|
|
// Use backslash for escaping wildcard characters.
|
|
'LIKE' => array('postfix' => " ESCAPE '\\\\'"),
|
|
'NOT LIKE' => array('postfix' => " ESCAPE '\\\\'"),
|
|
// These ones are here for performance reasons.
|
|
'=' => array(),
|
|
'<' => array(),
|
|
'>' => array(),
|
|
'>=' => array(),
|
|
'<=' => array(),
|
|
);
|
|
if (isset($specials[$operator])) {
|
|
$return = $specials[$operator];
|
|
}
|
|
else {
|
|
// We need to upper case because PHP index matches are case sensitive but
|
|
// do not need the more expensive drupal_strtoupper because SQL statements are ASCII.
|
|
$operator = strtoupper($operator);
|
|
$return = isset($specials[$operator]) ? $specials[$operator] : array();
|
|
}
|
|
|
|
$return += array('operator' => $operator);
|
|
|
|
return $return;
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* @} End of "addtogroup database".
|
|
*/
|