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。
mysql> delimiter //
mysql> create procedure hello()
-> begin
-> select 'It is not a HelloWorld';
-> end
-> //
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():
mysql> call hello()// +------------------------+ | It is not a HelloWorld | +------------------------+ | It is not a HelloWorld | +------------------------+ 1 row in set (0.00 sec)
我们再来一个好点的入门小实例吧
mysql> DROP TABLE IF EXISTS `userinfo`.`mapping`;
-> CREATE TABLE `userinfo`.`mapping` (
-> `cFieldID` smallint(5) unsigned NOT NULL,
-> `cFieldName` varchar(30) NOT NULL,
-> PRIMARY KEY (`cFieldID`)
-> ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
-> //
Query OK, 0 rows affected (0.14 sec)
想表中load值进空表 文件为：
filed.txt
1,MarketValue 2,P/L 3,EName 4,Nominal 5,Chg
mysql> load data infile 'd:\\field.txt' into table mapping
-> fields terminated by ',' lines terminated by '\r\n' //
Query OK, 5 rows affected (0.02 sec)
Records: 5 Deleted: 0 Skipped: 0 Warnings: 0
mysql> select *from mapping//
+----------+-------------+
| cFieldID | cFieldName |
+----------+-------------+
| 1 | MarketValue |
| 2 | P/L |
| 3 | EName |
| 4 | Nominal |
| 5 | Chg |
+----------+-------------+
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
mysql> drop procedure if exists mappingProc;
-> create procedure mappingProc(out cnt int)
-> begin
-> declare maxid int;
-> select max(cFieldID)+1 into maxid from mapping;
-> insert into mapping(cFieldID,cFieldName) values(maxid,'hello');
-> select count(cFieldID) into cnt from mapping;
-> end
-> //
查找mappingProc():
mysql> call mappingProc(@a)// mysql> select @a// +------+ | @a | +------+ | 6 | +------+ mysql> select * from mapping// +----------+-------------+ | cFieldID | cFieldName | +----------+-------------+ | 1 | MarketValue | | 2 | P/L | | 3 | EName | | 4 | Nominal | | 5 | Chg | | 6 | hello | +----------+-------------+
下面是java代码用来调用MySQL的存储过程：
package kissJava.sql;
import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Types;
public class SQLUtils {
String url = "jdbc:mysql://127.0.0.1:3306/userInfo";
String userName = "root";
String password = "zhui007";
public Connection getConnection() {
Connection con=null;
try{
DriverManager.registerDriver(new com.mysql.jdbc.Driver());
con = DriverManager.getConnection(url, this.userName, this.password);
}catch(SQLException sw){
}
return con;
}
public void testProc(){
Connection conn = getConnection();
CallableStatement stmt = null;
try{
stmt = conn.prepareCall("{call mappingProc(?)}");
stmt.registerOutParameter(1, Types.INTEGER);
stmt.execute();
int i= stmt.getInt(1);
System.out.println("count = " + i);
}catch(Exception e){
System.out.println("hahad = "+e.toString());
}finally{
try {
stmt.close();
conn.close();
}catch (Exception ex) {
System.out.println("ex : "+ ex.getMessage());
}
}
}
public static void main(String[] args) {
new SQLUtils().testProc();
}
}
在到MySQL中查询可看到插入一条新的记录