public function DatabaseSchema_mysql::addPrimaryKey

Add a primary key.

Parameters

string $table: The table to be altered.

string[] $fields: Fields for the primary key.

Return value

void:

Throws

DatabaseSchemaObjectDoesNotExistException If the specified table doesn't exist.

DatabaseSchemaObjectExistsException If the specified table already has a primary key.

Overrides DatabaseSchema::addPrimaryKey

File

core/includes/database/mysql/schema.inc, line 447

Database schema code for MySQL database servers.

Class

DatabaseSchema_mysql

Class to create and manipulate MySQL tables.

Code

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->indexExists($table, 'PRIMARY')) {
    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 (' . $this->createKeySql($fields) . ')');
}