mysql存储过程学习及java调用存储过程

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 xpmysql5，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

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