140 line
4.4 KiB
PHP
140 line
4.4 KiB
PHP
<?php
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/**
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* @file
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* Query code for SQLite embedded database engine.
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*/
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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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* SQLite specific implementation of InsertQuery.
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*
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* We ignore all the default fields and use the clever SQLite syntax:
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* INSERT INTO table DEFAULT VALUES
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* for degenerated "default only" queries.
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*/
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class InsertQuery_sqlite extends InsertQuery {
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public function execute() {
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if (!$this->preExecute()) {
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return NULL;
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}
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if (count($this->insertFields)) {
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return parent::execute();
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}
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else {
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return $this->connection->query('INSERT INTO {' . $this->table . '} DEFAULT VALUES', array(), $this->queryOptions);
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}
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}
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public function __toString() {
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// Create a sanitized comment string to prepend to the query.
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$comments = $this->connection->makeComment($this->comments);
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// Produce as many generic placeholders as necessary.
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$placeholders = array_fill(0, count($this->insertFields), '?');
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// If we're selecting from a SelectQuery, finish building the query and
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// pass it back, as any remaining options are irrelevant.
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if (!empty($this->fromQuery)) {
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$insert_fields_string = $this->insertFields ? ' (' . implode(', ', $this->insertFields) . ') ' : ' ';
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return $comments . 'INSERT INTO {' . $this->table . '}' . $insert_fields_string . $this->fromQuery;
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}
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return $comments . 'INSERT INTO {' . $this->table . '} (' . implode(', ', $this->insertFields) . ') VALUES (' . implode(', ', $placeholders) . ')';
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}
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}
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/**
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* SQLite specific implementation of UpdateQuery.
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*
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* SQLite counts all the rows that match the conditions as modified, even if they
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* will not be affected by the query. We workaround this by ensuring that
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* we don't select those rows.
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*
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* A query like this one:
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* UPDATE test SET col1 = 'newcol1', col2 = 'newcol2' WHERE tid = 1
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* will become:
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* UPDATE test SET col1 = 'newcol1', col2 = 'newcol2' WHERE tid = 1 AND (col1 <> 'newcol1' OR col2 <> 'newcol2')
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*/
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class UpdateQuery_sqlite extends UpdateQuery {
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public function execute() {
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if (!empty($this->queryOptions['sqlite_return_matched_rows'])) {
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return parent::execute();
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}
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// Get the fields used in the update query.
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$fields = $this->expressionFields + $this->fields;
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// Add the inverse of the fields to the condition.
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$condition = new DatabaseCondition('OR');
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foreach ($fields as $field => $data) {
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if (is_array($data)) {
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// The field is an expression.
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$condition->where($field . ' <> ' . $data['expression']);
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$condition->isNull($field);
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}
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elseif (!isset($data)) {
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// The field will be set to NULL.
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$condition->isNotNull($field);
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}
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else {
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$condition->condition($field, $data, '<>');
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$condition->isNull($field);
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}
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}
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if (count($condition)) {
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$condition->compile($this->connection, $this);
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$this->condition->where((string) $condition, $condition->arguments());
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}
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return parent::execute();
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}
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}
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/**
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* SQLite specific implementation of DeleteQuery.
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*/
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class DeleteQuery_sqlite extends DeleteQuery {
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public function execute() {
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// When the WHERE is omitted from a DELETE statement and the table being
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// deleted has no triggers, SQLite uses an optimization to erase the entire
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// table content without having to visit each row of the table individually.
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// Prior to SQLite 3.6.5, SQLite does not return the actual number of rows
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// deleted by that optimized "truncate" optimization. But we want to return
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// the number of rows affected, so we calculate it directly.
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if (!count($this->condition)) {
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$total_rows = $this->connection->query('SELECT COUNT(*) FROM {' . $this->connection->escapeTable($this->table) . '}')->fetchField();
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parent::execute();
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return $total_rows;
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}
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else {
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return parent::execute();
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}
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}
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}
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/**
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* SQLite specific implementation of TruncateQuery.
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*
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* SQLite doesn't support TRUNCATE, but a DELETE query with no condition has
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* exactly the effect (it is implemented by DROPing the table).
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*/
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class TruncateQuery_sqlite extends TruncateQuery {
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public function __toString() {
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// Create a sanitized comment string to prepend to the query.
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$comments = $this->connection->makeComment($this->comments);
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return $comments . 'DELETE FROM {' . $this->connection->escapeTable($this->table) . '} ';
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}
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}
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/**
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* @} End of "addtogroup database".
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*/
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