इस उदाहरण पर एक नज़र डालें -
CREATE TABLE table1(
column1 VARCHAR(255) DEFAULT NULL,
column2 VARCHAR(255) DEFAULT NULL,
column3 VARCHAR(255) DEFAULT NULL
);
INSERT INTO table1 VALUES
('1', 'value1', 'value2'),
('2', 'value3', 'value4');
DELIMITER $$
CREATE PROCEDURE procedure1(IN Param1 VARCHAR(255), OUT Param2 VARCHAR(255), OUT Param3 VARCHAR(255))
BEGIN
SET @c2 = '';
SET @c3 = '';
SET @query = 'SELECT column2, column3 INTO @c2, @c3 FROM table1 WHERE column1 = ?';
PREPARE stmt FROM @query;
SET @c1 = Param1;
EXECUTE stmt USING @c1;
DEALLOCATE PREPARE stmt;
SET Param2 = @c2;
SET Param3 = @c3;
END$$
DELIMITER ;
-- Call procedure and use variables
SET @Param1 = 2;
SET @Param2 = '';
SET @Param3 = '';
CALL procedure1(@Param1, @Param2, @Param3);
SELECT @Param2, @Param3;
+---------+---------+
| @Param2 | @Param3 |
+---------+---------+
| value3 | value4 |
+---------+---------+