lib/Doctrine/DBAL/Schema/AbstractSchemaManager.php
public function dropConstraint(Constraint $constraint, $table)
    {
        $this->_execSql($this->_platform->getDropConstraintSQL($constraint, $table));
    }
public function dropConstraint(Constraint $constraint, $table)
    {
        $this->_execSql($this->_platform->getDropConstraintSQL($constraint, $table));
    }
public function dropConstraint ( Constraint $ constraint , $ table ) { $ this -> _execSql ( $ this -> _platform -> getDropConstraintSQL ( $ constraint , $ table ) ) ; }
Drops the constraint from the given table.

@param Table|string $table The name of the table.

@return void
Drops the constraint from the given table .