mysql存储过程实例

mysql存储过程实例

由于mysql自定义函数中不能输出两或多个结果,所以需要用到mysql的存储过程。

下面是一个例子。

sql语句:

DROP PROCEDURE IF EXISTS `testguocheng`;

CREATE PROCEDURE `testguocheng`(IN `sql1` varchar(100),IN `sql2` varchar(100))

BEGIN

SET @SQLStr1=CONCAT(sql1 );

PREPARE stmt1 from @SQLStr1 ;

EXECUTE stmt1;

SET @SQLStr2=CONCAT(sql2);

PREPARE stmt2 from @SQLStr2 ;

EXECUTE stmt2;

END;

解释一下这个存储过程,输入的是两个sql语句,得到的结果是两个结果集。

下面是调用的java语句。

public static void getData() {

Connection conn = JdbcUtils.getConnection();

CallableStatement stmt = null;

ResultSet rs=null;

try{

stmt = conn.prepareCall("{call testguocheng('select * from tsys_user;','select count(*) from tsys_user;')}");

boolean flag=stmt.execute();

int i=0;

while(flag){

System.out.println("第几个结果集"+(++i));

rs = stmt.getResultSet();

if(i==1){

while(rs.next()){

System.out.println("uid:" +rs.getString("uid")+",uname:"+rs.getString("uname"));

}

}else{

while(rs.next()){

System.out.println("总数:" +rs.getString(1));

}

}

flag=stmt.getMoreResults();

}

}catch(Exception e){

System.out.println(e.toString());

}finally{

try {

stmt.close();

conn.close();

}catch (Exception ex) {

System.out.println(ex.getMessage());

}

}

}