mysql函数

1、创建函数

#创建函数
create function fun_add(x1 int,x2 int) returns INT	
	begin 
		return x1 + x2;
	end
#查看函数
show function status;
show function status like '%add%'
#调用函数
select fun_add(1,2)

2、Java调用函数

 @org.junit.Test
    public void testfun_add() throws Exception {
        long start = System.currentTimeMillis();
        //创建连接
        String driverClass = "com.mysql.jdbc.Driver";
        String url = "jdbc:mysql://localhost:3306/mysql_jdbc";
        String username = "root";
        String password = "root";
        Class.forName(driverClass);
        Connection con = DriverManager.getConnection(url, username, password);
        //关闭自动提交
        con.setAutoCommit(false);
        //调用存储过程
        CallableStatement cst = con.prepareCall("{? = call fun_add(?,?)}");
        //设置输入参数
        cst.setInt(2,100);
        cst.setInt(3,300);
        cst.registerOutParameter(1,Types.INTEGER);
        //执行存储过程
        cst.execute();
        int result = cst.getInt(1);
        System.out.println(result);
        //提交
        con.commit();

        cst.close();
        con.close();
        long time = System.currentTimeMillis() - start;
        System.out.println(time);//2085
    }