Java怎么读Mysql脚本的函数？Java如何调用Mysql的过程和函数？

#修改mysql语句的结果符为//

mysql > delimiter //

#定义一个过程，获取users表总记录数，将10设置到变量count中

create procedure simpleproc(out count int)

begin

select count(id) into count from users;

end

//

#修改mysql语句的结果符为;

mysql > delimiter ;

#调用过程，将结果覆给变量a，@是定义变量的符号

call simpleproc(@a);

#显示变量a的值

select @a;

//以下是Java调用Mysql的过程

String sql = "{call simpleproc(?)}";

Connection conn = JdbcUtil.getConnection();

CallableStatement cstmt = conn.prepareCall(sql);

cstmt.registerOutParameter(1,Types.INTEGER);

cstmt.execute();

Integer count = cstmt.getInt(1);

System.out.println("共有" + count + "人");

#修改mysql语句的结果符为//

mysql > delimiter //

#定义一个函数，完成字符串拼接

create function hello( s char(20) ) returns char(50)

return concat('hello，',s,'!');

//

#修改mysql语句的结果符为;

mysql > delimiter ;

#调用函数

select hello('world');

//以下是Java调用Mysql的函数

String sql = "{? = call hello(?)}";

Connection conn = JdbcUtil.getConnection();

CallableStatement cstmt = conn.prepareCall(sql);

cstmt.registerOutParameter(1,Types.VARCHAR);

cstmt.setString(2,"zhaojun");

cstmt.execute();

String value = cstmt.getString(1);

System.out.println(value);

JdbcUtil.close(cstmt);

JdbcUtil.close(conn);