存储过程虽然经常听到,但是我遇到的项目还没有使用过,比较郁闷,只能选择自己入门了,也顺便与大家分享,希望大家也能如愿,呵呵。
首先我用的环境是window xp+mysql5,这个大家应该都有的,没有的安装一下吧。好装好了,不要忘记将mysql.exe的路径目录放入环境变量path中,这样在cmd里输入以下命令就可以进入mysql的命令行模式:mysql -u root -p -> mysql密码即可。
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mysql> delimiter //
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mysql> create procedure hello()
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-> begin
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-> select 'It is not a HelloWorld';
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-> end
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-> //
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Query OK, 0 rows affected (0.01 sec)
delimiter // 是将结束符由默认的;换成了//,如果不这样select......语句就会导致上面的代码出错,不信你可以试一下哈,呵呵。接着在mysql中查询上面的过程hello():
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mysql> call hello()//
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+
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| It is not a HelloWorld |
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+
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| It is not a HelloWorld |
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+
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1 row in set (0.00 sec)
我们再来一个好点的入门小实例吧
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mysql> DROP TABLE IF EXISTS `userinfo`.`mapping`;
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-> CREATE TABLE `userinfo`.`mapping` (
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-> `cFieldID` smallint(5) unsigned NOT NULL,
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-> `cFieldName` varchar(30) NOT NULL,
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-> PRIMARY KEY (`cFieldID`)
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-> ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
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-> //
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Query OK, 0 rows affected (0.14 sec)
想表中load值进空表 文件为:
filed.txt
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1,MarketValue
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2,P/L
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3,EName
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4,Nominal
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5,Chg
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mysql> load data infile 'd:field.txt' into table mapping
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-> fields terminated by ',' lines terminated by 'rn' //
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Query OK, 5 rows affected (0.02 sec)
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Records: 5 Deleted: 0 Skipped: 0 Warnings: 0
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mysql> select *from mapping//
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+
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| cFieldID | cFieldName |
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+
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| 1 | MarketValue |
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| 2 | P/L |
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| 3 | EName |
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| 4 | Nominal |
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| 5 | Chg |
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+
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5 rows in set (0.02 sec)
现在简历一个向mapping中插入一条记录并返回记录的总和
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mysql> drop procedure if exists mappingProc;
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-> create procedure mappingProc(out cnt int)
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-> begin
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-> declare maxid int;
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-> select max(cFieldID)+1 into maxid from mapping;
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-> insert into mapping(cFieldID,cFieldName) values(maxid,'hello');
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-> select count(cFieldID) into cnt from mapping;
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-> end
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-> //
查找mappingProc():
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mysql> call mappingProc(@a)//
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mysql> select @a//
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+
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| @a |
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+
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| 6 |
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+
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mysql> select * from mapping//
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+
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| cFieldID | cFieldName |
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+
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| 1 | MarketValue |
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| 2 | P/L |
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| 3 | EName |
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| 4 | Nominal |
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| 5 | Chg |
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| 6 | hello |
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+
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