procedure
(1) 存储过程&游标
mysql> DELIMITER //
mysql> DROP PROCEDURE IF EXISTS ‘oh_qty’ //
mysql> CREATE PROCEDURE oh_qty()
-> BEGIN
-> DECLARE plant CHAR(4);
-> DECLARE loc CHAR (4);
-> DECLARE part CHAR (15);
-> DECLARE onhand DECIMAL(15,4);
-> DECLARE finished INTEGER DEFAULT 0;
-> DECLARE oh_cur CURSOR FOR
-> SELECT inv_plant,inv_loc,inv_part,inv_oh_qty FROM inv ;
->
-> DECLARE CONTINUE HANDLER FOR NOT FOUND SET finished=1;
->
-> OPEN oh_cur;
->
-> calcloop:
-> LOOP
-> FETCH oh_cur INTO plant,loc,part,onhand;
->
-> IF finished=1 THEN
-> LEAVE calcloop;
-> END IF;
->
-> IF plant=’SJ01’ THEN
-> ITERATE calcloop;
-> END IF;
->
-> UPDATE inv SET inv_oh_qty=inv_oh_qty * 10
-> WHERE inv_plant=plant AND inv_loc=loc AND inv_part=part;
->
-> END LOOP calcloop;
-> CLOSE oh_cur;
-> END//
Query OK, 0 rows affected (0.00 sec)
mysql> DELIMITER ;
mysql> CALL oh_qty();
Query OK, 1 row affected (0.02 sec)
（2）Procedure:
mysql>DELIMITER //
mysql>CREATE PROCEDURE get_inventory(OUT inv INT)
->SELECT 45 INTO inv;
->//
mysql>CALL get_inventory(@inv);
mysql>SELECT @inv;
返回结果：45
（3）IF语句
IF years_employed<5 THEN
SET bonus=total*.05;
ELSEIF years_employed>=5 and years_employed<10 THEN
SET bonus=total*.06;
ELSEIF years_employed>=10 THEN
SET bonus=total*.07;
END IF
（4）CASE语句
CASE
WHEN state=”AL” THEN
SET tax_rate=.04;
WHEN state=”AK” THEN
SET tax_rate=.00;
END CASE;
或：
CASE state
WHEN ”AL” THEN
SET tax_rate=.04;
WHEN ”AK” THEN
SET tax_rate=.00;
END CASE;
（5）REPEAT语句
CREATE PROCEDURE test_date(rows INT)
BEGIN
DECLARE val1 FLOAT;
DECLARE val2 FLOAT;
REPEAT
SELECT RAND() INTO val1;
SELECT RAND() INTO val2;
INSERT INTO analysis VALUES(NULL,val1,val2);
SET rows=rows-1;
UNTIL rows=0
END REPEAT;
END//
（6）WHILE语句
CREATE PROCEDURE test_date(rows INT)
BEGIN
DECLARE val1 FLOAT;
DECLARE val2 FLOAT;
WHILE rows> 0 DO
SELECT RAND() INTO val1;
SELECT RAND() INTO val2;
INSERT INTO analysis VALUES(NULL,val1,val2);
SET rows=rows-1;
END WHILE;
END//
（7）查看例程状态
mysql>SHOW PROCEDURE STATUS \G
mysql>SHOW PROCEDURE STATUS LIKE ‘get_products’ \G
mysql>SHOW FUNCTION STATUS \G
mysql>SHOW FUNCTION STATUS LIKE ‘get_%’ \G
（8）删除存储过程
mysql>DROP PROCEDURE calculate_bonus;
mysql>DROP FUNCTION calculate_bonus;
（9）查看例程的创建语法
mysql>SHOW CREATE PROCEDURE get_products;
mysql>SHOW CREATE FUNCTION calculate_bonus;
（10）php调用procedure
<?php
$result = mysql_query(“CALL get_employees()”);
?>
2.function
DELIMITER //
CREATE FUNTION calculate_bonus(employ_id CHAR(8))
RETURNS DECIMAL(10,2)
COMMENT ‘Calculate employee bonus’
BEGIN
DECLARE total DECIMAL(10,2);
DECLARE bonus DECIMAL(10,2);
SELECT SUM(price) INTO total
FROM sales WHERE employee_id=employee_id;
SET bonus= total * 0.05;
RETURN bonus;
END;
//
DELIMITER ;
SELECT calculate_bonus(“35558zhu”);
3.trigger
语法：
CREATE TRIGGER <trigger name>
{BEFORE | AFTER}
{INSERT | UPDATE | DELETE}
ON <table name>
FOR EACH ROW
<triggered SQL statement>
(1) 查看现有触发器
语法：SHOW TRIGGERS [FROM db_name] [LIKE expr]
实例：mysql>SHOW TRIGGERS\G
还有一种方法是：对INFORMATION_SCHEMA数据库中的TRIGGERS表查询
mysql>SELECT * FROM triggers T WHERE trigger_name=”mytrigger” \G
(2)修改触发器
暂时还没有修改现有触发器的命令，看来只能先删除后重建啦^_^
(3)删除触发器
DROP TRIGGER table_name.trigger_name;
为了成功执行，需要SUPER权限
（4）列名前可以加上NEW或OLD来使用列的最新值或原始值。
例子：
1.创建mytrigger.sql文件：
DELIMITER //
CREATE TRIGGER mytrigger
AFTER UPDATE ON inv FOR EACH ROW
BEGIN
IF NEW.oh_qty<0 THEN
SET NEW.oh_qty=0;
END IF;
END//
DELIMITER ;
2. 导入mytrigger.sql文件到mysql数据库中：
mysql>\. C:/mytrigger.sql;
3. update inv 测试触发器.