class DatabaseSchema_pgsql in Drupal 7
Hierarchy
- class \DatabaseSchema implements QueryPlaceholderInterface
- class \DatabaseSchema_pgsql
Expanded class hierarchy of DatabaseSchema_pgsql
Related topics
File
- includes/
database/ pgsql/ schema.inc, line 13 - Database schema code for PostgreSQL database servers.
View source
class DatabaseSchema_pgsql extends DatabaseSchema {
/**
* A cache of information about blob columns and sequences of tables.
*
* This is collected by DatabaseConnection_pgsql->queryTableInformation(),
* by introspecting the database.
*
* @see DatabaseConnection_pgsql->queryTableInformation()
* @var array
*/
protected $tableInformation = array();
/**
* Fetch the list of blobs and sequences used on a table.
*
* We introspect the database to collect the information required by insert
* and update queries.
*
* @param $table_name
* The non-prefixed name of the table.
* @return
* An object with two member variables:
* - 'blob_fields' that lists all the blob fields in the table.
* - 'sequences' that lists the sequences used in that table.
*/
public function queryTableInformation($table) {
// Generate a key to reference this table's information on.
$key = $this->connection
->prefixTables('{' . $table . '}');
if (!strpos($key, '.')) {
$key = 'public.' . $key;
}
if (!isset($this->tableInformation[$key])) {
// Split the key into schema and table for querying.
list($schema, $table_name) = explode('.', $key);
$table_information = (object) array(
'blob_fields' => array(),
'sequences' => array(),
);
// Don't use {} around information_schema.columns table.
$result = $this->connection
->query("SELECT column_name, data_type, column_default FROM information_schema.columns WHERE table_schema = :schema AND table_name = :table AND (data_type = 'bytea' OR (numeric_precision IS NOT NULL AND column_default LIKE :default))", array(
':schema' => $schema,
':table' => $table_name,
':default' => '%nextval%',
));
foreach ($result as $column) {
if ($column->data_type == 'bytea') {
$table_information->blob_fields[$column->column_name] = TRUE;
}
elseif (preg_match("/nextval\\('([^']+)'/", $column->column_default, $matches)) {
// We must know of any sequences in the table structure to help us
// return the last insert id. If there is more than 1 sequences the
// first one (index 0 of the sequences array) will be used.
$table_information->sequences[] = $matches[1];
$table_information->serial_fields[] = $column->column_name;
}
}
$this->tableInformation[$key] = $table_information;
}
return $this->tableInformation[$key];
}
/**
* Fetch the list of CHECK constraints used on a field.
*
* We introspect the database to collect the information required by field
* alteration.
*
* @param $table
* The non-prefixed name of the table.
* @param $field
* The name of the field.
* @return
* An array of all the checks for the field.
*/
public function queryFieldInformation($table, $field) {
$prefixInfo = $this
->getPrefixInfo($table, TRUE);
// Split the key into schema and table for querying.
$schema = $prefixInfo['schema'];
$table_name = $prefixInfo['table'];
$field_information = (object) array(
'checks' => array(),
);
$checks = $this->connection
->query("SELECT conname FROM pg_class cl INNER JOIN pg_constraint co ON co.conrelid = cl.oid INNER JOIN pg_attribute attr ON attr.attrelid = cl.oid AND attr.attnum = ANY (co.conkey) INNER JOIN pg_namespace ns ON cl.relnamespace = ns.oid WHERE co.contype = 'c' AND ns.nspname = :schema AND cl.relname = :table AND attr.attname = :column", array(
':schema' => $schema,
':table' => $table_name,
':column' => $field,
));
$field_information = $checks
->fetchCol();
return $field_information;
}
/**
* Generate SQL to create a new table from a Drupal schema definition.
*
* @param $name
* The name of the table to create.
* @param $table
* A Schema API table definition array.
* @return
* An array of SQL statements to create the table.
*/
protected function createTableSql($name, $table) {
$sql_fields = array();
foreach ($table['fields'] as $field_name => $field) {
$sql_fields[] = $this
->createFieldSql($field_name, $this
->processField($field));
}
$sql_keys = array();
if (isset($table['primary key']) && is_array($table['primary key'])) {
$sql_keys[] = 'PRIMARY KEY (' . implode(', ', $table['primary key']) . ')';
}
if (isset($table['unique keys']) && is_array($table['unique keys'])) {
foreach ($table['unique keys'] as $key_name => $key) {
$sql_keys[] = 'CONSTRAINT ' . $this
->prefixNonTable($name, $key_name, 'key') . ' UNIQUE (' . implode(', ', $key) . ')';
}
}
$sql = "CREATE TABLE {" . $name . "} (\n\t";
$sql .= implode(",\n\t", $sql_fields);
if (count($sql_keys) > 0) {
$sql .= ",\n\t";
}
$sql .= implode(",\n\t", $sql_keys);
$sql .= "\n)";
$statements[] = $sql;
if (isset($table['indexes']) && is_array($table['indexes'])) {
foreach ($table['indexes'] as $key_name => $key) {
$statements[] = $this
->_createIndexSql($name, $key_name, $key);
}
}
// Add table comment.
if (!empty($table['description'])) {
$statements[] = 'COMMENT ON TABLE {' . $name . '} IS ' . $this
->prepareComment($table['description']);
}
// Add column comments.
foreach ($table['fields'] as $field_name => $field) {
if (!empty($field['description'])) {
$statements[] = 'COMMENT ON COLUMN {' . $name . '}.' . $field_name . ' IS ' . $this
->prepareComment($field['description']);
}
}
return $statements;
}
/**
* 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_process_field().
*
* @param $name
* Name of the field.
* @param $spec
* The field specification, as per the schema data structure format.
*/
protected function createFieldSql($name, $spec) {
$sql = $name . ' ' . $spec['pgsql_type'];
if (isset($spec['type']) && $spec['type'] == 'serial') {
unset($spec['not null']);
}
if (in_array($spec['pgsql_type'], array(
'varchar',
'character',
'text',
)) && isset($spec['length'])) {
$sql .= '(' . $spec['length'] . ')';
}
elseif (isset($spec['precision']) && isset($spec['scale'])) {
$sql .= '(' . $spec['precision'] . ', ' . $spec['scale'] . ')';
}
if (!empty($spec['unsigned'])) {
$sql .= " CHECK ({$name} >= 0)";
}
if (isset($spec['not null'])) {
if ($spec['not null']) {
$sql .= ' NOT NULL';
}
else {
$sql .= ' NULL';
}
}
if (isset($spec['default'])) {
$default = is_string($spec['default']) ? "'" . $spec['default'] . "'" : $spec['default'];
$sql .= " default {$default}";
}
return $sql;
}
/**
* 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'])) {
$field['size'] = 'normal';
}
// Set the correct database-engine specific datatype.
// In case one is already provided, force it to lowercase.
if (isset($field['pgsql_type'])) {
$field['pgsql_type'] = drupal_strtolower($field['pgsql_type']);
}
else {
$map = $this
->getFieldTypeMap();
$field['pgsql_type'] = $map[$field['type'] . ':' . $field['size']];
}
if (!empty($field['unsigned'])) {
// Unsigned datatypes are not supported in PostgreSQL 8.3. In MySQL,
// they are used to ensure a positive number is inserted and it also
// doubles the maximum integer size that can be stored in a field.
// The PostgreSQL schema in Drupal creates a check constraint
// to ensure that a value inserted is >= 0. To provide the extra
// integer capacity, here, we bump up the column field size.
if (!isset($map)) {
$map = $this
->getFieldTypeMap();
}
switch ($field['pgsql_type']) {
case 'smallint':
$field['pgsql_type'] = $map['int:medium'];
break;
case 'int':
$field['pgsql_type'] = $map['int:big'];
break;
}
}
if (isset($field['type']) && $field['type'] == 'serial') {
unset($field['not null']);
}
return $field;
}
/**
* This maps a generic data type in combination with its data size
* to the engine-specific data type.
*/
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' => 'character',
'text:tiny' => 'text',
'text:small' => 'text',
'text:medium' => 'text',
'text:big' => 'text',
'text:normal' => 'text',
'int:tiny' => 'smallint',
'int:small' => 'smallint',
'int:medium' => 'int',
'int:big' => 'bigint',
'int:normal' => 'int',
'float:tiny' => 'real',
'float:small' => 'real',
'float:medium' => 'real',
'float:big' => 'double precision',
'float:normal' => 'real',
'numeric:normal' => 'numeric',
'blob:big' => 'bytea',
'blob:normal' => 'bytea',
'serial:tiny' => 'serial',
'serial:small' => 'serial',
'serial:medium' => 'serial',
'serial:big' => 'bigserial',
'serial:normal' => 'serial',
);
return $map;
}
protected function _createKeySql($fields) {
$return = array();
foreach ($fields as $field) {
if (is_array($field)) {
$return[] = 'substr(' . $field[0] . ', 1, ' . $field[1] . ')';
}
else {
$return[] = '"' . $field . '"';
}
}
return implode(', ', $return);
}
function renameTable($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,
)));
}
// Get the schema and tablename for the old table.
$old_full_name = $this->connection
->prefixTables('{' . $table . '}');
list($old_schema, $old_table_name) = strpos($old_full_name, '.') ? explode('.', $old_full_name) : array(
'public',
$old_full_name,
);
// Index names and constraint names are global in PostgreSQL, so we need to
// rename them when renaming the table.
$indexes = $this->connection
->query('SELECT indexname FROM pg_indexes WHERE schemaname = :schema AND tablename = :table', array(
':schema' => $old_schema,
':table' => $old_table_name,
));
foreach ($indexes as $index) {
if (preg_match('/^' . preg_quote($old_full_name) . '_(.*)$/', $index->indexname, $matches)) {
$index_name = $matches[1];
$this->connection
->query('ALTER INDEX ' . $index->indexname . ' RENAME TO {' . $new_name . '}_' . $index_name);
}
}
// Now rename the table.
// Ensure the new table name does not include schema syntax.
$prefixInfo = $this
->getPrefixInfo($new_name);
$this->connection
->query('ALTER TABLE {' . $table . '} RENAME TO ' . $prefixInfo['table']);
}
public function dropTable($table) {
if (!$this
->tableExists($table)) {
return FALSE;
}
$this->connection
->query('DROP TABLE {' . $table . '}');
return TRUE;
}
public function addField($table, $field, $spec, $new_keys = array()) {
if (!$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,
)));
}
$fixnull = FALSE;
if (!empty($spec['not null']) && !isset($spec['default'])) {
$fixnull = TRUE;
$spec['not null'] = FALSE;
}
$query = 'ALTER TABLE {' . $table . '} ADD COLUMN ';
$query .= $this
->createFieldSql($field, $this
->processField($spec));
$this->connection
->query($query);
if (isset($spec['initial'])) {
$this->connection
->update($table)
->fields(array(
$field => $spec['initial'],
))
->execute();
}
if ($fixnull) {
$this->connection
->query("ALTER TABLE {" . $table . "} ALTER {$field} SET NOT NULL");
}
if (isset($new_keys)) {
$this
->_createKeys($table, $new_keys);
}
// Add column comment.
if (!empty($spec['description'])) {
$this->connection
->query('COMMENT ON COLUMN {' . $table . '}.' . $field . ' IS ' . $this
->prepareComment($spec['description']));
}
}
public function dropField($table, $field) {
if (!$this
->fieldExists($table, $field)) {
return FALSE;
}
$this->connection
->query('ALTER TABLE {' . $table . '} DROP COLUMN "' . $field . '"');
return TRUE;
}
public function fieldSetDefault($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' => $field,
)));
}
if (!isset($default)) {
$default = 'NULL';
}
else {
$default = is_string($default) ? "'{$default}'" : $default;
}
$this->connection
->query('ALTER TABLE {' . $table . '} ALTER COLUMN "' . $field . '" SET DEFAULT ' . $default);
}
public function fieldSetNoDefault($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,
)));
}
$this->connection
->query('ALTER TABLE {' . $table . '} ALTER COLUMN "' . $field . '" DROP DEFAULT');
}
public function indexExists($table, $name) {
// Details http://www.postgresql.org/docs/8.3/interactive/view-pg-indexes.html
$index_name = '{' . $table . '}_' . $name . '_idx';
return (bool) $this->connection
->query("SELECT 1 FROM pg_indexes WHERE indexname = '{$index_name}'")
->fetchField();
}
/**
* Helper function: check if a constraint (PK, FK, UK) exists.
*
* @param $table
* The name of the table.
* @param $name
* The name of the constraint (typically 'pkey' or '[constraint]_key').
*/
protected function constraintExists($table, $name) {
$constraint_name = '{' . $table . '}_' . $name;
return (bool) $this->connection
->query("SELECT 1 FROM pg_constraint WHERE conname = '{$constraint_name}'")
->fetchField();
}
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' => $table,
)));
}
if ($this
->constraintExists($table, 'pkey')) {
throw new DatabaseSchemaObjectExistsException(t("Cannot add primary key to table @table: primary key already exists.", array(
'@table' => $table,
)));
}
$this->connection
->query('ALTER TABLE {' . $table . '} ADD PRIMARY KEY (' . implode(',', $fields) . ')');
}
public function dropPrimaryKey($table) {
if (!$this
->constraintExists($table, 'pkey')) {
return FALSE;
}
$this->connection
->query('ALTER TABLE {' . $table . '} DROP CONSTRAINT ' . $this
->prefixNonTable($table, 'pkey'));
return TRUE;
}
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
->constraintExists($table, $name . '_key')) {
throw new DatabaseSchemaObjectExistsException(t("Cannot add unique key @name to table @table: unique key already exists.", array(
'@table' => $table,
'@name' => $name,
)));
}
$this->connection
->query('ALTER TABLE {' . $table . '} ADD CONSTRAINT "' . $this
->prefixNonTable($table, $name, 'key') . '" UNIQUE (' . implode(',', $fields) . ')');
}
public function dropUniqueKey($table, $name) {
if (!$this
->constraintExists($table, $name . '_key')) {
return FALSE;
}
$this->connection
->query('ALTER TABLE {' . $table . '} DROP CONSTRAINT "' . $this
->prefixNonTable($table, $name, 'key') . '"');
return TRUE;
}
public function addIndex($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,
)));
}
$this->connection
->query($this
->_createIndexSql($table, $name, $fields));
}
public function dropIndex($table, $name) {
if (!$this
->indexExists($table, $name)) {
return FALSE;
}
$this->connection
->query('DROP INDEX ' . $this
->prefixNonTable($table, $name, 'idx'));
return TRUE;
}
public function changeField($table, $field, $field_new, $spec, $new_keys = array()) {
if (!$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,
)));
}
$spec = $this
->processField($spec);
// We need to typecast the new column to best be able to transfer the data
// Schema_pgsql::getFieldTypeMap() will return possibilities that are not
// 'cast-able' such as 'serial' - so they need to be casted int instead.
if (in_array($spec['pgsql_type'], array(
'serial',
'bigserial',
'numeric',
))) {
$typecast = 'int';
}
else {
$typecast = $spec['pgsql_type'];
}
if (in_array($spec['pgsql_type'], array(
'varchar',
'character',
'text',
)) && isset($spec['length'])) {
$typecast .= '(' . $spec['length'] . ')';
}
elseif (isset($spec['precision']) && isset($spec['scale'])) {
$typecast .= '(' . $spec['precision'] . ', ' . $spec['scale'] . ')';
}
// Remove old check constraints.
$field_info = $this
->queryFieldInformation($table, $field);
foreach ($field_info as $check) {
$this->connection
->query('ALTER TABLE {' . $table . '} DROP CONSTRAINT "' . $check . '"');
}
// Remove old default.
$this
->fieldSetNoDefault($table, $field);
$this->connection
->query('ALTER TABLE {' . $table . '} ALTER "' . $field . '" TYPE ' . $typecast . ' USING "' . $field . '"::' . $typecast);
if (isset($spec['not null'])) {
if ($spec['not null']) {
$nullaction = 'SET NOT NULL';
}
else {
$nullaction = 'DROP NOT NULL';
}
$this->connection
->query('ALTER TABLE {' . $table . '} ALTER "' . $field . '" ' . $nullaction);
}
if (in_array($spec['pgsql_type'], array(
'serial',
'bigserial',
))) {
// Type "serial" is known to PostgreSQL, but *only* during table creation,
// not when altering. Because of that, the sequence needs to be created
// and initialized by hand.
$seq = "{" . $table . "}_" . $field_new . "_seq";
$this->connection
->query("CREATE SEQUENCE " . $seq);
// Set sequence to maximal field value to not conflict with existing
// entries.
$this->connection
->query("SELECT setval('" . $seq . "', MAX(\"" . $field . '")) FROM {' . $table . "}");
$this->connection
->query('ALTER TABLE {' . $table . '} ALTER "' . $field . '" SET DEFAULT nextval(\'' . $seq . '\')');
}
// Rename the column if necessary.
if ($field != $field_new) {
$this->connection
->query('ALTER TABLE {' . $table . '} RENAME "' . $field . '" TO "' . $field_new . '"');
}
// Add unsigned check if necessary.
if (!empty($spec['unsigned'])) {
$this->connection
->query('ALTER TABLE {' . $table . '} ADD CHECK ("' . $field_new . '" >= 0)');
}
// Add default if necessary.
if (isset($spec['default'])) {
$this
->fieldSetDefault($table, $field_new, $spec['default']);
}
// Change description if necessary.
if (!empty($spec['description'])) {
$this->connection
->query('COMMENT ON COLUMN {' . $table . '}."' . $field_new . '" IS ' . $this
->prepareComment($spec['description']));
}
if (isset($new_keys)) {
$this
->_createKeys($table, $new_keys);
}
}
protected function _createIndexSql($table, $name, $fields) {
$query = 'CREATE INDEX "' . $this
->prefixNonTable($table, $name, 'idx') . '" ON {' . $table . '} (';
$query .= $this
->_createKeySql($fields) . ')';
return $query;
}
protected function _createKeys($table, $new_keys) {
if (isset($new_keys['primary key'])) {
$this
->addPrimaryKey($table, $new_keys['primary key']);
}
if (isset($new_keys['unique keys'])) {
foreach ($new_keys['unique keys'] as $name => $fields) {
$this
->addUniqueKey($table, $name, $fields);
}
}
if (isset($new_keys['indexes'])) {
foreach ($new_keys['indexes'] as $name => $fields) {
$this
->addIndex($table, $name, $fields);
}
}
}
/**
* Retrieve a table or column comment.
*/
public function getComment($table, $column = NULL) {
$info = $this
->getPrefixInfo($table);
// Don't use {} around pg_class, pg_attribute tables.
if (isset($column)) {
return $this->connection
->query('SELECT col_description(oid, attnum) FROM pg_class, pg_attribute WHERE attrelid = oid AND relname = ? AND attname = ?', array(
$info['table'],
$column,
))
->fetchField();
}
else {
return $this->connection
->query('SELECT obj_description(oid, ?) FROM pg_class WHERE relname = ?', array(
'pg_class',
$info['table'],
))
->fetchField();
}
}
}Members
Name |
Modifiers | Type | Description | Overrides |
|---|---|---|---|---|
|
DatabaseSchema:: |
protected | property | The database connection. | |
|
DatabaseSchema:: |
protected | property | Definition of prefixInfo array structure. | 1 |
|
DatabaseSchema:: |
protected | property | The placeholder counter. | |
|
DatabaseSchema:: |
protected | property | A unique identifier for this query object. | |
|
DatabaseSchema:: |
protected | function | Build a condition to match a table name against a standard information_schema. | 1 |
|
DatabaseSchema:: |
public | function | Create a new table from a Drupal table definition. | |
|
DatabaseSchema:: |
public | function | Check if a column exists in the given table. | 2 |
|
DatabaseSchema:: |
public | function | Return an array of field names from an array of key/index column specifiers. | |
|
DatabaseSchema:: |
public | function | Find all tables that are like the specified base table name. | 1 |
|
DatabaseSchema:: |
public | function | Finds all tables that are like the specified base table name. This is a backport of the change made to findTables in Drupal 8 to work with virtual, un-prefixed table names. The original function is retained for Backwards Compatibility. | 1 |
|
DatabaseSchema:: |
protected | function | Get information about the table name and schema from the prefix. | 1 |
|
DatabaseSchema:: |
public | function |
Implements QueryPlaceHolderInterface::nextPlaceholder(). Overrides QueryPlaceholderInterface:: |
|
|
DatabaseSchema:: |
function | Create names for indexes, primary keys and constraints. | ||
|
DatabaseSchema:: |
public | function | Prepare a table or column comment for database query. | 1 |
|
DatabaseSchema:: |
public | function | Check if a table exists. | 2 |
|
DatabaseSchema:: |
public | function |
Implements QueryPlaceHolderInterface::uniqueIdentifier(). Overrides QueryPlaceholderInterface:: |
|
|
DatabaseSchema:: |
public | function | Implements the magic __clone function. | |
|
DatabaseSchema:: |
public | function | ||
|
DatabaseSchema_pgsql:: |
protected | property | A cache of information about blob columns and sequences of tables. | |
|
DatabaseSchema_pgsql:: |
public | function |
Add a new field to a table. Overrides DatabaseSchema:: |
|
|
DatabaseSchema_pgsql:: |
public | function |
Add an index. Overrides DatabaseSchema:: |
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DatabaseSchema_pgsql:: |
public | function |
Add a primary key. Overrides DatabaseSchema:: |
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DatabaseSchema_pgsql:: |
function |
Add a unique key. Overrides DatabaseSchema:: |
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DatabaseSchema_pgsql:: |
public | function |
Change a field definition. Overrides DatabaseSchema:: |
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DatabaseSchema_pgsql:: |
protected | function | Helper function: check if a constraint (PK, FK, UK) exists. | |
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DatabaseSchema_pgsql:: |
protected | function | Create an SQL string for a field to be used in table creation or alteration. | |
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DatabaseSchema_pgsql:: |
protected | function | Generate SQL to create a new table from a Drupal schema definition. | |
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DatabaseSchema_pgsql:: |
public | function |
Drop a field. Overrides DatabaseSchema:: |
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DatabaseSchema_pgsql:: |
public | function |
Drop an index. Overrides DatabaseSchema:: |
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DatabaseSchema_pgsql:: |
public | function |
Drop the primary key. Overrides DatabaseSchema:: |
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DatabaseSchema_pgsql:: |
public | function |
Drop a table. Overrides DatabaseSchema:: |
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DatabaseSchema_pgsql:: |
public | function |
Drop a unique key. Overrides DatabaseSchema:: |
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DatabaseSchema_pgsql:: |
public | function |
Set the default value for a field. Overrides DatabaseSchema:: |
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DatabaseSchema_pgsql:: |
public | function |
Set a field to have no default value. Overrides DatabaseSchema:: |
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DatabaseSchema_pgsql:: |
public | function | Retrieve a table or column comment. | |
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DatabaseSchema_pgsql:: |
function |
This maps a generic data type in combination with its data size
to the engine-specific data type. Overrides DatabaseSchema:: |
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DatabaseSchema_pgsql:: |
public | function |
Checks if an index exists in the given table. Overrides DatabaseSchema:: |
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DatabaseSchema_pgsql:: |
protected | function | Set database-engine specific properties for a field. | |
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DatabaseSchema_pgsql:: |
public | function | Fetch the list of CHECK constraints used on a field. | |
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DatabaseSchema_pgsql:: |
public | function | Fetch the list of blobs and sequences used on a table. | |
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DatabaseSchema_pgsql:: |
function |
Rename a table. Overrides DatabaseSchema:: |
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DatabaseSchema_pgsql:: |
protected | function | ||
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DatabaseSchema_pgsql:: |
protected | function | ||
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DatabaseSchema_pgsql:: |
protected | function |