doctrine / dbal

     *

     * @throws SchemaException If the foreign key does not exist.

     */

    public function getForeignKey($constraintName)

    {

        $constraintName = $this->normalizeIdentifier($constraintName);

        if (!$this->hasForeignKey($constraintName)) {

            throw SchemaException::foreignKeyDoesNotExist($constraintName, $this->_name);

        }

        return $this->_fkConstraints[$constraintName];

    }

    /**

     * Removes the foreign key constraint with the given name.

     *

     * @throws SchemaException

     */

    public function removeForeignKey($constraintName)

    {

        $constraintName = $this->normalizeIdentifier($constraintName);

        if (!$this->hasForeignKey($constraintName)) {

            throw SchemaException::foreignKeyDoesNotExist($constraintName, $this->_name);

        }

        unset($this->_fkConstraints[$constraintName]);

    }

    /**

     * Returns ordered list of columns (primary keys are first, then foreign keys, then the rest)