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- <?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 existsing 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);
- }
- }
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