DatabaseSchema_mysql::fieldExists
public function DatabaseSchema_mysql::fieldExists
public DatabaseSchema_mysql::fieldExists($table, $column)
Check if a column exists in the given table.
Parameters
$table: The name of the table in drupal (no prefixing).
$name: The name of the column.
Return value
TRUE if the given column exists, otherwise FALSE.
Overrides DatabaseSchema::fieldExists
File
- includes/database/mysql/schema.inc, line 523
- Database schema code for MySQL database servers.
Class
Code
public function fieldExists($table, $column) { // The information_schema table is very slow to query under MySQL 5.0. // Instead, we try to select from the table and field in question. If it // fails, the most likely reason is that it does not exist. That is // dramatically faster than using information_schema. // @link http://bugs.mysql.com/bug.php?id=19588 // @todo: This override should be removed once we require a version of MySQL // that has that bug fixed. try { $this->connection->queryRange("SELECT $column FROM {" . $table . "}", 0, 1); return TRUE; } catch (Exception $e) { return FALSE; } }
© 2001–2016 by the original authors
Licensed under the GNU General Public License, version 2 and later.
Drupal is a registered trademark of Dries Buytaert.
https://api.drupal.org/api/drupal/includes!database!mysql!schema.inc/function/DatabaseSchema_mysql::fieldExists/7.x