public function Schema::queryTableInformation in Drupal 9
Same name and namespace in other branches
- 8 core/lib/Drupal/Core/Database/Driver/pgsql/Schema.php \Drupal\Core\Database\Driver\pgsql\Schema::queryTableInformation()
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.
Parameters
string $table: The non-prefixed name of the table.
Return value
mixed|object An object with two member variables:
- 'blob_fields' that lists all the blob fields in the table.
- 'sequences' that lists the sequences used in that table.
Throws
\Exception Exception thrown when the query for the table information fails.
2 calls to Schema::queryTableInformation()
- Schema::changeField in core/
lib/ Drupal/ Core/ Database/ Driver/ pgsql/ Schema.php - Change a field definition.
- Schema::renameTable in core/
lib/ Drupal/ Core/ Database/ Driver/ pgsql/ Schema.php - Rename a table.
File
- core/
lib/ Drupal/ Core/ Database/ Driver/ pgsql/ Schema.php, line 117
Class
- Schema
- PostgreSQL implementation of \Drupal\Core\Database\Schema.
Namespace
Drupal\Core\Database\Driver\pgsqlCode
public function queryTableInformation($table) {
// Generate a key to reference this table's information on.
$key = $this->connection
->prefixTables('{' . $table . '}');
// Take into account that temporary tables are stored in a different schema.
// \Drupal\Core\Database\Connection::generateTemporaryTableName() sets the
// 'db_temporary_' prefix to all temporary tables.
if (strpos($key, '.') === FALSE && strpos($table, 'db_temporary_') === FALSE) {
$key = 'public.' . $key;
}
else {
$key = $this
->getTempNamespaceName() . '.' . $key;
}
if (!isset($this->tableInformation[$key])) {
$table_information = (object) [
'blob_fields' => [],
'sequences' => [],
];
$this->connection
->addSavepoint();
try {
// The bytea columns and sequences for a table can be found in
// pg_attribute, which is significantly faster than querying the
// information_schema. The data type of a field can be found by lookup
// of the attribute ID, and the default value must be extracted from the
// node tree for the attribute definition instead of the historical
// human-readable column, adsrc.
$sql = <<<'EOD'
SELECT pg_attribute.attname AS column_name, format_type(pg_attribute.atttypid, pg_attribute.atttypmod) AS data_type, pg_get_expr(pg_attrdef.adbin, pg_attribute.attrelid) AS column_default
FROM pg_attribute
LEFT JOIN pg_attrdef ON pg_attrdef.adrelid = pg_attribute.attrelid AND pg_attrdef.adnum = pg_attribute.attnum
WHERE pg_attribute.attnum > 0
AND NOT pg_attribute.attisdropped
AND pg_attribute.attrelid = :key::regclass
AND (format_type(pg_attribute.atttypid, pg_attribute.atttypmod) = 'bytea'
OR pg_get_expr(pg_attrdef.adbin, pg_attribute.attrelid) LIKE 'nextval%')
EOD;
$result = $this->connection
->query($sql, [
':key' => $key,
]);
} catch (\Exception $e) {
$this->connection
->rollbackSavepoint();
throw $e;
}
$this->connection
->releaseSavepoint();
// If the table information does not yet exist in the PostgreSQL
// metadata, then return the default table information here, so that it
// will not be cached.
if (empty($result)) {
return $table_information;
}
foreach ($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];
}