mysql存储过程的例子:
DELIMITER $$DROP PROCEDURE IF EXISTS `cn_games`.`proc_pay_fill_rule`$$CREATE DEFINER=`root`@`%` PROCEDURE `proc_pay_fill_rule`(IN strdate varchar(10))BEGINdeclare done int;DECLARE price float;DECLARE cpid varchar(10);DECLARE producttype varchar(10);DECLARE startvalue bigint(20);DECLARE endvalue bigint(20);DECLARE cppercent float;/*通用规则*/DECLARE pay_rule_cursor cursor for SELECT cp_id,product_type, start_value,end_value,cp_percent from t_cp_percent WHERE EXTRACT(YEAR_MONTH from start_date)<=EXTRACT(YEAR_MONTH from strdate)and EXTRACT(YEAR_MONTH from end_date)>=EXTRACT(YEAR_MONTH from strdate)and cp_id='0' and product_type='';/*特殊cp的支付规则*/DECLARE special_pay_rule_cursor cursor for SELECT cp_id,product_type, start_value,end_value,cp_percent from t_cp_percent WHERE EXTRACT(YEAR_MONTH from start_date)<=EXTRACT(YEAR_MONTH from strdate)and EXTRACT(YEAR_MONTH from end_date)>=EXTRACT(YEAR_MONTH from strdate)and cp_id!='0';/*特殊cp的productType(产品类型)支付规则*/DECLARE special_pt_pay_rule_cursor cursor for SELECT cp_id,product_type, start_value,end_value,cp_percent from t_cp_percent WHERE EXTRACT(YEAR_MONTH from start_date)<=EXTRACT(YEAR_MONTH from strdate)and EXTRACT(YEAR_MONTH from end_date)>=EXTRACT(YEAR_MONTH from strdate)and cp_id!='0' and product_type!='';declare continue handler for not found set done=1;drop table if exists TMP_t_pay_month;CREATE TEMPORARY TABLE `TMP_t_pay_month` ( `stat_date` varchar(15) default NULL, `cp_id` varchar(10) default NULL, `product_type` varchar(10) default NULL, `stat_num` varchar(20) default NULL, `stat_totle_fee` varchar(20) default NULL, `stat_finally_fee` varchar(20) default NULL, `cp_percent` float default NULL ) type heap;if strdate is not null THEN /*对第二次出帐进行限制*/ if exists (select id from t_pay_month where left(stat_date,7)=left(strdate,7) limit 0,1) then select "1"; else /*把数据导入到临时表中*/ insert into TMP_t_pay_month (stat_date,cp_id,product_type,stat_num,stat_totle_fee,stat_finally_fee,cp_percent) select left(stat_date,7),cp_id,product_type,sum(orders),sum(income),0,0 from t_cp_report group by left(stat_date,7),cp_id,product_type; /*通用的支付规则开始循环*/ set done=0; open pay_rule_cursor; loop1:loop /*把值插入到变量中*/ fetch pay_rule_cursor into cpid,producttype,startvalue,endvalue,cppercent; if done=1 then leave loop1; end if; /*更新临时表中的比值*/ update TMP_t_pay_month set cp_percent=cppercent where stat_totle_fee>=startvalue and stat_totle_fee<endvalue; end loop loop1; close pay_rule_cursor; /*特殊cp的支付规则开始循环*/ set done=0; open special_pay_rule_cursor; loop2:loop fetch special_pay_rule_cursor into cpid,producttype,startvalue,endvalue,cppercent; if done=1 then leave loop2; end if; update TMP_t_pay_month set cp_percent=cppercent where stat_totle_fee>=startvalue and stat_totle_fee<endvalue and cp_id=cpid; end loop loop2; CLOSE special_pay_rule_cursor; /*特殊cp的产品的支付规则开始循环*/ set done=0; open special_pt_pay_rule_cursor; loop3:loop fetch special_pt_pay_rule_cursor into cpid,producttype,startvalue,endvalue,cppercent; if done=1 then leave loop3; end if; update TMP_t_pay_month set cp_percent=cppercent where stat_totle_fee>=startvalue and stat_totle_fee<endvalue and cp_id=cpid and product_type=producttype; end loop loop3; CLOSE special_pt_pay_rule_cursor; /*更新临时表中的最终支付的字段的值*/ update TMP_t_pay_month set stat_finally_fee=ROUND(stat_totle_fee*cp_percent); /*把数据由临时表插入到正式表中,目前因为测试把cp_percent字段的值为总金额*/ insert into t_pay_month (stat_date,cp_id,product_type,stat_num, stat_fee,cp_percent, pass_status, pay_status, create_date) select stat_date,cp_id,product_type,stat_num,stat_finally_fee,cp_percent,0,0,now() from TMP_t_pay_month; end if;end if; END$$DELIMITER ;
一.创建存储过程
1.基本语法:
CREATE DEFINER=`root`@`%` PROCEDURE `proc_pay_fill_rule`(IN strdate varchar(10))
begin
.........
end
2.参数传递
`proc_pay_fill_rule`(IN strdate varchar(10))
strdate参数从调用的时候传入,例如:call proc_pay_fill_rule('2009-02-01')
二.调用存储过程
1.基本语法:call sp_name()
注意:存储过程名称后面必须加括号,哪怕该存储过程没有参数传递
三.删除存储过程
1.基本语法:
drop procedure sp_name//
2.注意事项
(1)不能在一个存储过程中删除另一个存储过程,只能调用另一个存储过程
四.区块,条件,循环
1.区块定义,常用
begin
......
end;
也可以给区块起别名,如:
lable:begin
...........
end lable;
可以用leave lable;跳出区块,执行区块以后的代码
2.条件语句
if 条件 then
statement
else
statement
end if;
如:
if exists (select id from t_pay_month where left(stat_date,7)=left(strdate,7) limit 0,1) then statement else statement
是判断某一个数据库是否有数据。
3.循环语句
1)首先定义游标,语法如:DECLARE ... CURSOR FOR SELECT ... FROM ... 例子如下:
DECLARE pay_rule_cursor cursor for SELECT cp_id,product_type, start_value,end_value,cp_percent from t_cp_percent WHERE EXTRACT(YEAR_MONTH from start_date)<=EXTRACT(YEAR_MONTH from strdate) and EXTRACT(YEAR_MONTH from end_date)>=EXTRACT(YEAR_MONTH from strdate) and cp_id='0' and product_type='';
2)声明一个游标使用的变量,(用处不是很明白,在打开游标之前还要set done=0;好像是用于跳出循环用的,)如:declare continue handler for not found set done=1;
2)打开游标,open ...;如:open pay_rule_cursor.
3)开始循环,name:loop 如:loop1:loop
4)把游标的值插入到声明的变量中去,语法:fetch ...(游标名) into ....(变量名列表),如:
fetch pay_rule_cursor into cpid,producttype,startvalue,endvalue,cppercent;
5)接着加上
if done=1 then leave loop1; end if;
好像是跳出循环用。
6)接着就是执行需要的操作,如:
update TMP_t_pay_month set cp_percent=cppercent where stat_totle_fee>=startvalue and stat_totle_fee<endvalue;
7)结束循环,如:end loop loop1;
8)关闭游标,如:CLOSE pay_rule_cursor;
我是采用了这个流程才正确执行了循环。
五.其他常用命令
1.show procedure status
显示数据库中所有存储的存储过程基本信息,包括所属数据库,存储过程名称,创建时间等
2.show create procedure sp_name
显示某一个存储过程的详细信息
参考文章:http://blog.csdn.net/crazy_rain/archive/2007/07/06/1680799.aspx