mysql存储过程及java调用存储过程

首先在mysql中练习下存储过程的小例子：   

delimiter //
create procedure hello()
 begin
select 'It is not a HelloWorld';
end
 //

在mysql中查询上面的过程hello():

call hello();
-----------------------+
 It is not a HelloWorld |
-----------------------+
 It is not a HelloWorld |

建立一个简单的测试用表：

 DROP TABLE IF EXISTS `test`.`mapping`;
 CREATE TABLE  `test`.`mapping` (

   `cFieldID` smallint(5) unsigned NOT NULL,
   `cFieldName` varchar(30) NOT NULL,
   PRIMARY KEY  (`cFieldID`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8;

向table mapping中插入一些初始化的数据：

mysql> select *from mapping//
+----------+-------------+
| cFieldID | cFieldName  |
+----------+-------------+
|        1 | MarketValue |
|        2 | P/L         |
|        3 | EName       |
|        4 | Nominal     |
|        5 | Chg         |
+----------+-------------+

现在简历一个向mapping中插入一条记录并返回记录的总和

 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():

 call mappingProc(@a);
 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：

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/test";
    String userName = "root";
    String password = "sunlong";
    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