684 lines
23 KiB
PHP
684 lines
23 KiB
PHP
<?php
|
|
|
|
/**
|
|
* @file
|
|
* Database schema code for SQLite databases.
|
|
*/
|
|
|
|
|
|
/**
|
|
* @ingroup schemaapi
|
|
* @{
|
|
*/
|
|
|
|
class DatabaseSchema_sqlite extends DatabaseSchema {
|
|
|
|
/**
|
|
* Override DatabaseSchema::$defaultSchema
|
|
*/
|
|
protected $defaultSchema = 'main';
|
|
|
|
public function tableExists($table) {
|
|
$info = $this->getPrefixInfo($table);
|
|
|
|
// Don't use {} around sqlite_master table.
|
|
return (bool) $this->connection->query('SELECT 1 FROM ' . $info['schema'] . '.sqlite_master WHERE type = :type AND name = :name', array(':type' => 'table', ':name' => $info['table']))->fetchField();
|
|
}
|
|
|
|
public function fieldExists($table, $column) {
|
|
$schema = $this->introspectSchema($table);
|
|
return !empty($schema['fields'][$column]);
|
|
}
|
|
|
|
/**
|
|
* Generate SQL to create a new table from a Drupal schema definition.
|
|
*
|
|
* @param $name
|
|
* The name of the table to create.
|
|
* @param $table
|
|
* A Schema API table definition array.
|
|
* @return
|
|
* An array of SQL statements to create the table.
|
|
*/
|
|
public function createTableSql($name, $table) {
|
|
$sql = array();
|
|
$sql[] = "CREATE TABLE {" . $name . "} (\n" . $this->createColumsSql($name, $table) . "\n);\n";
|
|
return array_merge($sql, $this->createIndexSql($name, $table));
|
|
}
|
|
|
|
/**
|
|
* Build the SQL expression for indexes.
|
|
*/
|
|
protected function createIndexSql($tablename, $schema) {
|
|
$sql = array();
|
|
$info = $this->getPrefixInfo($tablename);
|
|
if (!empty($schema['unique keys'])) {
|
|
foreach ($schema['unique keys'] as $key => $fields) {
|
|
$sql[] = 'CREATE UNIQUE INDEX ' . $info['schema'] . '.' . $info['table'] . '_' . $key . ' ON ' . $info['table'] . ' (' . $this->createKeySql($fields) . "); \n";
|
|
}
|
|
}
|
|
if (!empty($schema['indexes'])) {
|
|
foreach ($schema['indexes'] as $key => $fields) {
|
|
$sql[] = 'CREATE INDEX ' . $info['schema'] . '.' . $info['table'] . '_' . $key . ' ON ' . $info['table'] . ' (' . $this->createKeySql($fields) . "); \n";
|
|
}
|
|
}
|
|
return $sql;
|
|
}
|
|
|
|
/**
|
|
* Build the SQL expression for creating columns.
|
|
*/
|
|
protected function createColumsSql($tablename, $schema) {
|
|
$sql_array = array();
|
|
|
|
// Add the SQL statement for each field.
|
|
foreach ($schema['fields'] as $name => $field) {
|
|
if (isset($field['type']) && $field['type'] == 'serial') {
|
|
if (isset($schema['primary key']) && ($key = array_search($name, $schema['primary key'])) !== FALSE) {
|
|
unset($schema['primary key'][$key]);
|
|
}
|
|
}
|
|
$sql_array[] = $this->createFieldSql($name, $this->processField($field));
|
|
}
|
|
|
|
// Process keys.
|
|
if (!empty($schema['primary key'])) {
|
|
$sql_array[] = " PRIMARY KEY (" . $this->createKeySql($schema['primary key']) . ")";
|
|
}
|
|
|
|
return implode(", \n", $sql_array);
|
|
}
|
|
|
|
/**
|
|
* Build the SQL expression for keys.
|
|
*/
|
|
protected function createKeySql($fields) {
|
|
$return = array();
|
|
foreach ($fields as $field) {
|
|
if (is_array($field)) {
|
|
$return[] = $field[0];
|
|
}
|
|
else {
|
|
$return[] = $field;
|
|
}
|
|
}
|
|
return implode(', ', $return);
|
|
}
|
|
|
|
/**
|
|
* Set database-engine specific properties for a field.
|
|
*
|
|
* @param $field
|
|
* A field description array, as specified in the schema documentation.
|
|
*/
|
|
protected function processField($field) {
|
|
if (!isset($field['size'])) {
|
|
$field['size'] = 'normal';
|
|
}
|
|
|
|
// Set the correct database-engine specific datatype.
|
|
// In case one is already provided, force it to uppercase.
|
|
if (isset($field['sqlite_type'])) {
|
|
$field['sqlite_type'] = drupal_strtoupper($field['sqlite_type']);
|
|
}
|
|
else {
|
|
$map = $this->getFieldTypeMap();
|
|
$field['sqlite_type'] = $map[$field['type'] . ':' . $field['size']];
|
|
}
|
|
|
|
if (isset($field['type']) && $field['type'] == 'serial') {
|
|
$field['auto_increment'] = TRUE;
|
|
}
|
|
|
|
return $field;
|
|
}
|
|
|
|
/**
|
|
* Create an SQL string for a field to be used in table creation or alteration.
|
|
*
|
|
* Before passing a field out of a schema definition into this function it has
|
|
* to be processed by db_processField().
|
|
*
|
|
* @param $name
|
|
* Name of the field.
|
|
* @param $spec
|
|
* The field specification, as per the schema data structure format.
|
|
*/
|
|
protected function createFieldSql($name, $spec) {
|
|
if (!empty($spec['auto_increment'])) {
|
|
$sql = $name . " INTEGER PRIMARY KEY AUTOINCREMENT";
|
|
if (!empty($spec['unsigned'])) {
|
|
$sql .= ' CHECK (' . $name . '>= 0)';
|
|
}
|
|
}
|
|
else {
|
|
$sql = $name . ' ' . $spec['sqlite_type'];
|
|
|
|
if (in_array($spec['sqlite_type'], array('VARCHAR', 'TEXT')) && isset($spec['length'])) {
|
|
$sql .= '(' . $spec['length'] . ')';
|
|
}
|
|
|
|
if (isset($spec['not null'])) {
|
|
if ($spec['not null']) {
|
|
$sql .= ' NOT NULL';
|
|
}
|
|
else {
|
|
$sql .= ' NULL';
|
|
}
|
|
}
|
|
|
|
if (!empty($spec['unsigned'])) {
|
|
$sql .= ' CHECK (' . $name . '>= 0)';
|
|
}
|
|
|
|
if (isset($spec['default'])) {
|
|
if (is_string($spec['default'])) {
|
|
$spec['default'] = "'" . $spec['default'] . "'";
|
|
}
|
|
$sql .= ' DEFAULT ' . $spec['default'];
|
|
}
|
|
|
|
if (empty($spec['not null']) && !isset($spec['default'])) {
|
|
$sql .= ' DEFAULT NULL';
|
|
}
|
|
}
|
|
return $sql;
|
|
}
|
|
|
|
/**
|
|
* This maps a generic data type in combination with its data size
|
|
* to the engine-specific data type.
|
|
*/
|
|
public function getFieldTypeMap() {
|
|
// Put :normal last so it gets preserved by array_flip. This makes
|
|
// it much easier for modules (such as schema.module) to map
|
|
// database types back into schema types.
|
|
// $map does not use drupal_static as its value never changes.
|
|
static $map = array(
|
|
'varchar:normal' => 'VARCHAR',
|
|
'char:normal' => 'CHAR',
|
|
|
|
'text:tiny' => 'TEXT',
|
|
'text:small' => 'TEXT',
|
|
'text:medium' => 'TEXT',
|
|
'text:big' => 'TEXT',
|
|
'text:normal' => 'TEXT',
|
|
|
|
'serial:tiny' => 'INTEGER',
|
|
'serial:small' => 'INTEGER',
|
|
'serial:medium' => 'INTEGER',
|
|
'serial:big' => 'INTEGER',
|
|
'serial:normal' => 'INTEGER',
|
|
|
|
'int:tiny' => 'INTEGER',
|
|
'int:small' => 'INTEGER',
|
|
'int:medium' => 'INTEGER',
|
|
'int:big' => 'INTEGER',
|
|
'int:normal' => 'INTEGER',
|
|
|
|
'float:tiny' => 'FLOAT',
|
|
'float:small' => 'FLOAT',
|
|
'float:medium' => 'FLOAT',
|
|
'float:big' => 'FLOAT',
|
|
'float:normal' => 'FLOAT',
|
|
|
|
'numeric:normal' => 'NUMERIC',
|
|
|
|
'blob:big' => 'BLOB',
|
|
'blob:normal' => 'BLOB',
|
|
);
|
|
return $map;
|
|
}
|
|
|
|
public function renameTable($table, $new_name) {
|
|
if (!$this->tableExists($table)) {
|
|
throw new DatabaseSchemaObjectDoesNotExistException(t("Cannot rename @table to @table_new: table @table doesn't exist.", array('@table' => $table, '@table_new' => $new_name)));
|
|
}
|
|
if ($this->tableExists($new_name)) {
|
|
throw new DatabaseSchemaObjectExistsException(t("Cannot rename @table to @table_new: table @table_new already exists.", array('@table' => $table, '@table_new' => $new_name)));
|
|
}
|
|
|
|
$schema = $this->introspectSchema($table);
|
|
|
|
// SQLite doesn't allow you to rename tables outside of the current
|
|
// database. So the syntax '...RENAME TO database.table' would fail.
|
|
// So we must determine the full table name here rather than surrounding
|
|
// the table with curly braces incase the db_prefix contains a reference
|
|
// to a database outside of our existing database.
|
|
$info = $this->getPrefixInfo($new_name);
|
|
$this->connection->query('ALTER TABLE {' . $table . '} RENAME TO ' . $info['table']);
|
|
|
|
// Drop the indexes, there is no RENAME INDEX command in SQLite.
|
|
if (!empty($schema['unique keys'])) {
|
|
foreach ($schema['unique keys'] as $key => $fields) {
|
|
$this->dropIndex($table, $key);
|
|
}
|
|
}
|
|
if (!empty($schema['indexes'])) {
|
|
foreach ($schema['indexes'] as $index => $fields) {
|
|
$this->dropIndex($table, $index);
|
|
}
|
|
}
|
|
|
|
// Recreate the indexes.
|
|
$statements = $this->createIndexSql($new_name, $schema);
|
|
foreach ($statements as $statement) {
|
|
$this->connection->query($statement);
|
|
}
|
|
}
|
|
|
|
public function dropTable($table) {
|
|
if (!$this->tableExists($table)) {
|
|
return FALSE;
|
|
}
|
|
$this->connection->tableDropped = TRUE;
|
|
$this->connection->query('DROP TABLE {' . $table . '}');
|
|
return TRUE;
|
|
}
|
|
|
|
public function addField($table, $field, $specification, $keys_new = array()) {
|
|
if (!$this->tableExists($table)) {
|
|
throw new DatabaseSchemaObjectDoesNotExistException(t("Cannot add field @table.@field: table doesn't exist.", array('@field' => $field, '@table' => $table)));
|
|
}
|
|
if ($this->fieldExists($table, $field)) {
|
|
throw new DatabaseSchemaObjectExistsException(t("Cannot add field @table.@field: field already exists.", array('@field' => $field, '@table' => $table)));
|
|
}
|
|
|
|
// SQLite doesn't have a full-featured ALTER TABLE statement. It only
|
|
// supports adding new fields to a table, in some simple cases. In most
|
|
// cases, we have to create a new table and copy the data over.
|
|
if (empty($keys_new) && (empty($specification['not null']) || isset($specification['default']))) {
|
|
// When we don't have to create new keys and we are not creating a
|
|
// NOT NULL column without a default value, we can use the quicker version.
|
|
$query = 'ALTER TABLE {' . $table . '} ADD ' . $this->createFieldSql($field, $this->processField($specification));
|
|
$this->connection->query($query);
|
|
|
|
// Apply the initial value if set.
|
|
if (isset($specification['initial'])) {
|
|
$this->connection->update($table)
|
|
->fields(array($field => $specification['initial']))
|
|
->execute();
|
|
}
|
|
}
|
|
else {
|
|
// We cannot add the field directly. Use the slower table alteration
|
|
// method, starting from the old schema.
|
|
$old_schema = $this->introspectSchema($table);
|
|
$new_schema = $old_schema;
|
|
|
|
// Add the new field.
|
|
$new_schema['fields'][$field] = $specification;
|
|
|
|
// Build the mapping between the old fields and the new fields.
|
|
$mapping = array();
|
|
if (isset($specification['initial'])) {
|
|
// If we have a initial value, copy it over.
|
|
$mapping[$field] = array(
|
|
'expression' => ':newfieldinitial',
|
|
'arguments' => array(':newfieldinitial' => $specification['initial']),
|
|
);
|
|
}
|
|
else {
|
|
// Else use the default of the field.
|
|
$mapping[$field] = NULL;
|
|
}
|
|
|
|
// Add the new indexes.
|
|
$new_schema += $keys_new;
|
|
|
|
$this->alterTable($table, $old_schema, $new_schema, $mapping);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Create a table with a new schema containing the old content.
|
|
*
|
|
* As SQLite does not support ALTER TABLE (with a few exceptions) it is
|
|
* necessary to create a new table and copy over the old content.
|
|
*
|
|
* @param $table
|
|
* Name of the table to be altered.
|
|
* @param $old_schema
|
|
* The old schema array for the table.
|
|
* @param $new_schema
|
|
* The new schema array for the table.
|
|
* @param $mapping
|
|
* An optional mapping between the fields of the old specification and the
|
|
* fields of the new specification. An associative array, whose keys are
|
|
* the fields of the new table, and values can take two possible forms:
|
|
* - a simple string, which is interpreted as the name of a field of the
|
|
* old table,
|
|
* - an associative array with two keys 'expression' and 'arguments',
|
|
* that will be used as an expression field.
|
|
*/
|
|
protected function alterTable($table, $old_schema, $new_schema, array $mapping = array()) {
|
|
$i = 0;
|
|
do {
|
|
$new_table = $table . '_' . $i++;
|
|
} while ($this->tableExists($new_table));
|
|
|
|
$this->createTable($new_table, $new_schema);
|
|
|
|
// Build a SQL query to migrate the data from the old table to the new.
|
|
$select = $this->connection->select($table);
|
|
|
|
// Complete the mapping.
|
|
$possible_keys = array_keys($new_schema['fields']);
|
|
$mapping += array_combine($possible_keys, $possible_keys);
|
|
|
|
// Now add the fields.
|
|
foreach ($mapping as $field_alias => $field_source) {
|
|
// Just ignore this field (ie. use it's default value).
|
|
if (!isset($field_source)) {
|
|
continue;
|
|
}
|
|
|
|
if (is_array($field_source)) {
|
|
$select->addExpression($field_source['expression'], $field_alias, $field_source['arguments']);
|
|
}
|
|
else {
|
|
$select->addField($table, $field_source, $field_alias);
|
|
}
|
|
}
|
|
|
|
// Execute the data migration query.
|
|
$this->connection->insert($new_table)
|
|
->from($select)
|
|
->execute();
|
|
|
|
$old_count = $this->connection->query('SELECT COUNT(*) FROM {' . $table . '}')->fetchField();
|
|
$new_count = $this->connection->query('SELECT COUNT(*) FROM {' . $new_table . '}')->fetchField();
|
|
if ($old_count == $new_count) {
|
|
$this->dropTable($table);
|
|
$this->renameTable($new_table, $table);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Find out the schema of a table.
|
|
*
|
|
* This function uses introspection methods provided by the database to
|
|
* create a schema array. This is useful, for example, during update when
|
|
* the old schema is not available.
|
|
*
|
|
* @param $table
|
|
* Name of the table.
|
|
* @return
|
|
* An array representing the schema, from drupal_get_schema().
|
|
* @see drupal_get_schema()
|
|
*/
|
|
protected function introspectSchema($table) {
|
|
$mapped_fields = array_flip($this->getFieldTypeMap());
|
|
$schema = array(
|
|
'fields' => array(),
|
|
'primary key' => array(),
|
|
'unique keys' => array(),
|
|
'indexes' => array(),
|
|
);
|
|
|
|
$info = $this->getPrefixInfo($table);
|
|
$result = $this->connection->query('PRAGMA ' . $info['schema'] . '.table_info(' . $info['table'] . ')');
|
|
foreach ($result as $row) {
|
|
if (preg_match('/^([^(]+)\((.*)\)$/', $row->type, $matches)) {
|
|
$type = $matches[1];
|
|
$length = $matches[2];
|
|
}
|
|
else {
|
|
$type = $row->type;
|
|
$length = NULL;
|
|
}
|
|
if (isset($mapped_fields[$type])) {
|
|
list($type, $size) = explode(':', $mapped_fields[$type]);
|
|
$schema['fields'][$row->name] = array(
|
|
'type' => $type,
|
|
'size' => $size,
|
|
'not null' => !empty($row->notnull),
|
|
'default' => trim($row->dflt_value, "'"),
|
|
);
|
|
if ($length) {
|
|
$schema['fields'][$row->name]['length'] = $length;
|
|
}
|
|
if ($row->pk) {
|
|
$schema['primary key'][] = $row->name;
|
|
}
|
|
}
|
|
else {
|
|
new Exception("Unable to parse the column type " . $row->type);
|
|
}
|
|
}
|
|
$indexes = array();
|
|
$result = $this->connection->query('PRAGMA ' . $info['schema'] . '.index_list(' . $info['table'] . ')');
|
|
foreach ($result as $row) {
|
|
if (strpos($row->name, 'sqlite_autoindex_') !== 0) {
|
|
$indexes[] = array(
|
|
'schema_key' => $row->unique ? 'unique keys' : 'indexes',
|
|
'name' => $row->name,
|
|
);
|
|
}
|
|
}
|
|
foreach ($indexes as $index) {
|
|
$name = $index['name'];
|
|
// Get index name without prefix.
|
|
$index_name = substr($name, strlen($info['table']) + 1);
|
|
$result = $this->connection->query('PRAGMA ' . $info['schema'] . '.index_info(' . $name . ')');
|
|
foreach ($result as $row) {
|
|
$schema[$index['schema_key']][$index_name][] = $row->name;
|
|
}
|
|
}
|
|
return $schema;
|
|
}
|
|
|
|
public function dropField($table, $field) {
|
|
if (!$this->fieldExists($table, $field)) {
|
|
return FALSE;
|
|
}
|
|
|
|
$old_schema = $this->introspectSchema($table);
|
|
$new_schema = $old_schema;
|
|
|
|
unset($new_schema['fields'][$field]);
|
|
foreach ($new_schema['indexes'] as $index => $fields) {
|
|
foreach ($fields as $key => $field_name) {
|
|
if ($field_name == $field) {
|
|
unset($new_schema['indexes'][$index][$key]);
|
|
}
|
|
}
|
|
// If this index has no more fields then remove it.
|
|
if (empty($new_schema['indexes'][$index])) {
|
|
unset($new_schema['indexes'][$index]);
|
|
}
|
|
}
|
|
$this->alterTable($table, $old_schema, $new_schema);
|
|
return TRUE;
|
|
}
|
|
|
|
public function changeField($table, $field, $field_new, $spec, $keys_new = array()) {
|
|
if (!$this->fieldExists($table, $field)) {
|
|
throw new DatabaseSchemaObjectDoesNotExistException(t("Cannot change the definition of field @table.@name: field doesn't exist.", array('@table' => $table, '@name' => $field)));
|
|
}
|
|
if (($field != $field_new) && $this->fieldExists($table, $field_new)) {
|
|
throw new DatabaseSchemaObjectExistsException(t("Cannot rename field @table.@name to @name_new: target field already exists.", array('@table' => $table, '@name' => $field, '@name_new' => $field_new)));
|
|
}
|
|
|
|
$old_schema = $this->introspectSchema($table);
|
|
$new_schema = $old_schema;
|
|
|
|
// Map the old field to the new field.
|
|
if ($field != $field_new) {
|
|
$mapping[$field_new] = $field;
|
|
}
|
|
else {
|
|
$mapping = array();
|
|
}
|
|
|
|
// Remove the previous definition and swap in the new one.
|
|
unset($new_schema['fields'][$field]);
|
|
$new_schema['fields'][$field_new] = $spec;
|
|
|
|
// Map the former indexes to the new column name.
|
|
$new_schema['primary key'] = $this->mapKeyDefinition($new_schema['primary key'], $mapping);
|
|
foreach (array('unique keys', 'indexes') as $k) {
|
|
foreach ($new_schema[$k] as &$key_definition) {
|
|
$key_definition = $this->mapKeyDefinition($key_definition, $mapping);
|
|
}
|
|
}
|
|
|
|
// Add in the keys from $keys_new.
|
|
if (isset($keys_new['primary key'])) {
|
|
$new_schema['primary key'] = $keys_new['primary key'];
|
|
}
|
|
foreach (array('unique keys', 'indexes') as $k) {
|
|
if (!empty($keys_new[$k])) {
|
|
$new_schema[$k] = $keys_new[$k] + $new_schema[$k];
|
|
}
|
|
}
|
|
|
|
$this->alterTable($table, $old_schema, $new_schema, $mapping);
|
|
}
|
|
|
|
/**
|
|
* Utility method: rename columns in an index definition according to a new mapping.
|
|
*
|
|
* @param $key_definition
|
|
* The key definition.
|
|
* @param $mapping
|
|
* The new mapping.
|
|
*/
|
|
protected function mapKeyDefinition(array $key_definition, array $mapping) {
|
|
foreach ($key_definition as &$field) {
|
|
// The key definition can be an array($field, $length).
|
|
if (is_array($field)) {
|
|
$field = &$field[0];
|
|
}
|
|
if (isset($mapping[$field])) {
|
|
$field = $mapping[$field];
|
|
}
|
|
}
|
|
return $key_definition;
|
|
}
|
|
|
|
public function addIndex($table, $name, $fields) {
|
|
if (!$this->tableExists($table)) {
|
|
throw new DatabaseSchemaObjectDoesNotExistException(t("Cannot add index @name to table @table: table doesn't exist.", array('@table' => $table, '@name' => $name)));
|
|
}
|
|
if ($this->indexExists($table, $name)) {
|
|
throw new DatabaseSchemaObjectExistsException(t("Cannot add index @name to table @table: index already exists.", array('@table' => $table, '@name' => $name)));
|
|
}
|
|
|
|
$schema['indexes'][$name] = $fields;
|
|
$statements = $this->createIndexSql($table, $schema);
|
|
foreach ($statements as $statement) {
|
|
$this->connection->query($statement);
|
|
}
|
|
}
|
|
|
|
public function indexExists($table, $name) {
|
|
$info = $this->getPrefixInfo($table);
|
|
|
|
return $this->connection->query('PRAGMA ' . $info['schema'] . '.index_info(' . $info['table'] . '_' . $name . ')')->fetchField() != '';
|
|
}
|
|
|
|
public function dropIndex($table, $name) {
|
|
if (!$this->indexExists($table, $name)) {
|
|
return FALSE;
|
|
}
|
|
|
|
$info = $this->getPrefixInfo($table);
|
|
|
|
$this->connection->query('DROP INDEX ' . $info['schema'] . '.' . $info['table'] . '_' . $name);
|
|
return TRUE;
|
|
}
|
|
|
|
public function addUniqueKey($table, $name, $fields) {
|
|
if (!$this->tableExists($table)) {
|
|
throw new DatabaseSchemaObjectDoesNotExistException(t("Cannot add unique key @name to table @table: table doesn't exist.", array('@table' => $table, '@name' => $name)));
|
|
}
|
|
if ($this->indexExists($table, $name)) {
|
|
throw new DatabaseSchemaObjectExistsException(t("Cannot add unique key @name to table @table: unique key already exists.", array('@table' => $table, '@name' => $name)));
|
|
}
|
|
|
|
$schema['unique keys'][$name] = $fields;
|
|
$statements = $this->createIndexSql($table, $schema);
|
|
foreach ($statements as $statement) {
|
|
$this->connection->query($statement);
|
|
}
|
|
}
|
|
|
|
public function dropUniqueKey($table, $name) {
|
|
if (!$this->indexExists($table, $name)) {
|
|
return FALSE;
|
|
}
|
|
|
|
$info = $this->getPrefixInfo($table);
|
|
|
|
$this->connection->query('DROP INDEX ' . $info['schema'] . '.' . $info['table'] . '_' . $name);
|
|
return TRUE;
|
|
}
|
|
|
|
public function addPrimaryKey($table, $fields) {
|
|
if (!$this->tableExists($table)) {
|
|
throw new DatabaseSchemaObjectDoesNotExistException(t("Cannot add primary key to table @table: table doesn't exist.", array('@table' => $table)));
|
|
}
|
|
|
|
$old_schema = $this->introspectSchema($table);
|
|
$new_schema = $old_schema;
|
|
|
|
if (!empty($new_schema['primary key'])) {
|
|
throw new DatabaseSchemaObjectExistsException(t("Cannot add primary key to table @table: primary key already exists.", array('@table' => $table)));
|
|
}
|
|
|
|
$new_schema['primary key'] = $fields;
|
|
$this->alterTable($table, $old_schema, $new_schema);
|
|
}
|
|
|
|
public function dropPrimaryKey($table) {
|
|
$old_schema = $this->introspectSchema($table);
|
|
$new_schema = $old_schema;
|
|
|
|
if (empty($new_schema['primary key'])) {
|
|
return FALSE;
|
|
}
|
|
|
|
unset($new_schema['primary key']);
|
|
$this->alterTable($table, $old_schema, $new_schema);
|
|
return TRUE;
|
|
}
|
|
|
|
public function fieldSetDefault($table, $field, $default) {
|
|
if (!$this->fieldExists($table, $field)) {
|
|
throw new DatabaseSchemaObjectDoesNotExistException(t("Cannot set default value of field @table.@field: field doesn't exist.", array('@table' => $table, '@field' => $field)));
|
|
}
|
|
|
|
$old_schema = $this->introspectSchema($table);
|
|
$new_schema = $old_schema;
|
|
|
|
$new_schema['fields'][$field]['default'] = $default;
|
|
$this->alterTable($table, $old_schema, $new_schema);
|
|
}
|
|
|
|
public function fieldSetNoDefault($table, $field) {
|
|
if (!$this->fieldExists($table, $field)) {
|
|
throw new DatabaseSchemaObjectDoesNotExistException(t("Cannot remove default value of field @table.@field: field doesn't exist.", array('@table' => $table, '@field' => $field)));
|
|
}
|
|
|
|
$old_schema = $this->introspectSchema($table);
|
|
$new_schema = $old_schema;
|
|
|
|
unset($new_schema['fields'][$field]['default']);
|
|
$this->alterTable($table, $old_schema, $new_schema);
|
|
}
|
|
|
|
public function findTables($table_expression) {
|
|
// Don't add the prefix, $table_expression already includes the prefix.
|
|
$info = $this->getPrefixInfo($table_expression, FALSE);
|
|
|
|
// Can't use query placeholders for the schema because the query would have
|
|
// to be :prefixsqlite_master, which does not work.
|
|
$result = db_query("SELECT name FROM " . $info['schema'] . ".sqlite_master WHERE type = :type AND name LIKE :table_name", array(
|
|
':type' => 'table',
|
|
':table_name' => $info['table'],
|
|
));
|
|
return $result->fetchAllKeyed(0, 0);
|
|
}
|
|
}
|