Add a unique key.

Parameters

$table: The table to be altered.

$name: The name of the key.

$fields: An array of field names.

Overrides DatabaseSchema::addUniqueKey

File

includes/database/mysql/schema.inc, line 425

Class

DatabaseSchema_mysql

Code

public function addUniqueKey($table, $name, $fields) {
 if (!$this->tableExists ($table)) {
 throw new DatabaseSchemaObjectDoesNotExistException (t ("Cannot add unique key @name to table @table: table doesn't exist.", array(
 '@table' => $table,
 '@name' => $name,
 )));
 }
 if ($this->indexExists ($table, $name)) {
 throw new DatabaseSchemaObjectExistsException (t ("Cannot add unique key @name to table @table: unique key already exists.", array(
 '@table' => $table,
 '@name' => $name,
 )));
 }
 $this->connection 
 ->query ('ALTER TABLE {' . $table . '} ADD UNIQUE KEY `' . $name . '` (' . $this->createKeySql ($fields) . ')');
}

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