public function DatabaseSchema_mysql::fieldExists

7.x schema.inc 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

5 calls to DatabaseSchema_mysql::fieldExists()

DatabaseSchema_mysql::addField in drupal-7.x/includes/database/mysql/schema.inc: Add a new field to a table.
DatabaseSchema_mysql::changeField in drupal-7.x/includes/database/mysql/schema.inc: Change a field definition.
DatabaseSchema_mysql::dropField in drupal-7.x/includes/database/mysql/schema.inc: Drop a field.
DatabaseSchema_mysql::fieldSetDefault in drupal-7.x/includes/database/mysql/schema.inc: Set the default value for a field.
DatabaseSchema_mysql::fieldSetNoDefault in drupal-7.x/includes/database/mysql/schema.inc: Set a field to have no default value.

File

drupal-7.x/includes/database/mysql/schema.inc, line 515: Database schema code for MySQL database servers.

Class

DatabaseSchema_mysql

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;
  }
}