MySQL存储过程及Java中存储过程的调用(二)

INOUT参数例子

创建:

1. mysql > DELIMITER //

2. mysql > CREATE PROCEDURE demo_inout_parameter(INOUT p_inout int)

3. -> BEGIN

4. -> SELECT p_inout;

5. -> SET p_inout=2;

6. -> SELECT p_inout;

7. -> END;

8. -> //

9. mysql > DELIMITER ;

执行结果:

1. mysql > SET @p_inout=1;

2. mysql > CALL demo_inout_parameter(@p_inout) ;

3. +---------+

4. | p_inout |

5. +---------+

6. | 1 |

7. +---------+

8.

9. +---------+

10. | p_inout |

11. +---------+

12. | 2 |

13. +---------+

14.

15. mysql > SELECT @p_inout;

16. +----------+

17. | @p_inout |

18. +----------+

19. | 2 |

+----------+

(4). 变量

Ⅰ. 变量定义

DECLARE variable_name [,variable_name...] datatype [DEFAULT value];