Add a primary key.
$table: The table to be altered.
$fields: Fields for the primary key.
DatabaseSchemaObjectDoesNotExistException If the specified table doesn't exist.
DatabaseSchemaObjectExistsException If the specified table already has a primary key.
Overrides DatabaseSchema::addPrimaryKey
public function addPrimaryKey($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
->constraintExists($table, 'pkey')) {
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 (' . implode(',', $fields) . ')');
}