Mysql Programming CS 155P笔记(三)
CREATE PROCEDURE
CREATE PROCEDURE sp_name ([proc_parameter[,...]])
[characteristic ...] routine_body
mysql> delimiter //
mysql> CREATE PROCEDURE simpleproc (OUT param1 INT)
-> BEGIN
-> SELECT COUNT(*) INTO param1 FROM t;
-> END
-> //
Query OK, 0 rows affected (0.00 sec)
mysql> delimiter ;
mysql> CALL simpleproc(@a);
Query OK, 0 rows affected (0.00 sec)
mysql> SELECT @a;
+------+
| @a |
+------+
| 3 |
+------+
1 row in set (0.00 sec)
由括号包围的参数列必须总是存在。如果没有参数，也该使用一个空参数列()。每个参数 默认都是一个IN参数。要指定为其它参数，可在参数名之前使用关键词 OUT或INOUT
注意: 指定参数为IN, OUT, 或INOUT 只对PROCEDURE是合法的。（FUNCTION参数总是被认为是IN参数）
procedure需要使用call来调用
CALL sp_name([parameter[,...]])
CALL语句调用一个先前用CREATE PROCEDURE创建的程序。
CALL语句可以用 声明为OUT或的INOUT参数的参数给它的调用者传回值
CREATE FUNCTION
CREATE FUNCTION sp_name ([func_parameter[,...]])
RETURNS type
[characteristic ...] routine_body
proc_parameter:
[ IN | OUT | INOUT ] param_name type
func_parameter:
param_name type
type:
Any valid MySQL data type
characteristic:
LANGUAGE SQL
| [NOT] DETERMINISTIC
| { CONTAINS SQL | NO SQL | READS SQL DATA | MODIFIES SQL DATA }
| SQL SECURITY { DEFINER | INVOKER }
| COMMENT 'string'
routine_body:
Valid SQL procedure statement or statements
mysql> delimiter //
mysql> CREATE FUNCTION hello (s CHAR(20)) RETURNS CHAR(50)
-> RETURN CONCAT('Hello, ',s,'!');
-> //
Query OK, 0 rows affected (0.00 sec)
mysql> delimiter ;
mysql> SELECT hello('world');
+----------------+
| hello('world') |
+----------------+
| Hello, world! |
+----------------+
1 row in set (0.00 sec)
RETURNS字句只能对FUNCTION做指定，对函数而言这是强制的。它用来指定函数的返回类型，而且函数体必须包含一个RETURN value语句
ALTER {PROCEDURE | FUNCTION} sp_name [characteristic ...]
characteristic:
{ CONTAINS SQL | NO SQL | READS SQL DATA | MODIFIES SQL DATA }
| SQL SECURITY { DEFINER | INVOKER }
| COMMENT 'string'
DROP {PROCEDURE | FUNCTION} [IF EXISTS] sp_name
SHOW CREATE {PROCEDURE | FUNCTION} sp_name
mysql> SHOW CREATE FUNCTION test.hello\G
*************************** 1. row ***************************
Function: hello
sql_mode:
Create Function: CREATE FUNCTION `test`.`hello`(s CHAR(20)) RETURNS CHAR(50)
RETURN CONCAT('Hello, ',s,'!')
SHOW {PROCEDURE | FUNCTION} STATUS [LIKE 'pattern']
mysql> SHOW FUNCTION STATUS LIKE 'hello'\G
*************************** 1. row ***************************
Db: test
Name: hello
Type: FUNCTION
Definer: testuser@localhost
Modified: 2004-08-03 15:29:37
Created: 2004-08-03 15:29:37
Security_type: DEFINER
Comment:
posted on
2018-02-23 10:24 ecwork 阅读(
...) 评论(
...) 编辑 收藏