protected function Schema::findPrimaryKeyColumns in Drupal 8

Same name in this branch

1. 8 core/lib/Drupal/Core/Database/Schema.php \Drupal\Core\Database\Schema::findPrimaryKeyColumns()
2. 8 core/lib/Drupal/Core/Database/Driver/sqlite/Schema.php \Drupal\Core\Database\Driver\sqlite\Schema::findPrimaryKeyColumns()
3. 8 core/lib/Drupal/Core/Database/Driver/pgsql/Schema.php \Drupal\Core\Database\Driver\pgsql\Schema::findPrimaryKeyColumns()
4. 8 core/lib/Drupal/Core/Database/Driver/mysql/Schema.php \Drupal\Core\Database\Driver\mysql\Schema::findPrimaryKeyColumns()

Same name and namespace in other branches

1. 9 core/lib/Drupal/Core/Database/Driver/mysql/Schema.php \Drupal\Core\Database\Driver\mysql\Schema::findPrimaryKeyColumns()

Finds the primary key columns of a table, from the database.

Parameters

string $table: The name of the table.

Return value

string[]|false A simple array with the names of the columns composing the table's primary key, or FALSE if the table does not exist.

Throws

\RuntimeException If the driver does not override this method.

Overrides Schema::findPrimaryKeyColumns

1 call to Schema::findPrimaryKeyColumns()

Schema::dropField in core/lib/Drupal/Core/Database/Driver/mysql/Schema.php

Drop a field.

File

core/lib/Drupal/Core/Database/Driver/mysql/Schema.php, line 552

Class

Schema

MySQL implementation of \Drupal\Core\Database\Schema.

Namespace

Drupal\Core\Database\Driver\mysql

Code

protected function findPrimaryKeyColumns($table) {
  if (!$this
    ->tableExists($table)) {
    return FALSE;
  }
  $result = $this->connection
    ->query("SHOW KEYS FROM {" . $table . "} WHERE Key_name = 'PRIMARY'")
    ->fetchAllAssoc('Column_name');
  return array_keys($result);
}