mybatis 存储过程的写法

　　(注意事项： 在使用游标的时候，不能在游标声明之前，使用crud)

　　存储过程示例

CREATE DEFINER=`root`@`::1` PROCEDURE `earnings_proceduce`(out  result varchar(100))
label:BEGIN
    #收益记录的分配

    # 基本参数的定义
    # 总金额
    DECLARE _total_money BIGINT DEFAULT 0;
    # 发放配置占比
    DECLARE _deduct BIGINT;
    # 待发放金额
    DECLARE _stay_out BIGINT DEFAULT 0;
    # 用户最多保存数量
    DECLARE _num BIGINT DEFAULT 0;
    # 查询通宝币总额
    DECLARE _tb_num BIGINT DEFAULT 0;
    # 实际发放金额
    DECLARE _amount BIGINT DEFAULT 0;
    # 定时发放时间分钟
    DECLARE _time_mi BIGINT DEFAULT 0;
    # 收入统计的id
    DECLARE _newid BIGINT;

    # 判断是否遍历全部记录的标记
    DECLARE done int default 0;
    # 标识事务错误
  DECLARE err INT DEFAULT 0;

  DECLARE i_id BIGINT;
  DECLARE i_num BIGINT;

    # 使用游标将数据存储到数据库中，并进行实际发放金额的统计
    DECLARE cur CURSOR FOR
    select c.id,sum(d.numbers) from
  ( select a.id from sys_user a LEFT JOIN earnings_record b ON a.id = b.user_id and b.status = ‘0‘ GROUP BY a.id having count(a.id) <= (
    select deduct from earnings_manage where type = 4
    )) c join zxt_detail d on c.id = d.creator group by c.id;

    # 出现错误，设置为1，只要发生异常就回滚
  DECLARE CONTINUE HANDLER FOR SQLEXCEPTION SET err=1;
    # 将结束标志绑定到游标
  DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;
    set result=‘0‘;

    # 查询总金额
    select IFNULL(sum(order_money),0) into _total_money from other_order where ISNULL(issue_id);
    # 如果为0 就退出存储过程
    if _total_money = 0 THEN
            set result=‘查询总金额为0,不进行发放‘;
            LEAVE label;
    end if;

    # 查询基本配置
    select deduct into _deduct from earnings_manage where type = 0;
    # 计算待发放金额
    set _stay_out=ROUND(_total_money * _deduct /100);
# 如果为0 就退出存储过程
    if _stay_out = 0 THEN
            set result=‘待发放金额金额为0,不进行发放‘;
            LEAVE label;
    end if;

# 查询通宝总额
    select IFNULL(sum(numbers),0) into _tb_num from zxt_detail;
    # 如果为0 就退出存储过程
    if _tb_num = 0 THEN
            set result=‘通宝总金额为0,不进行发放‘;
            LEAVE label;
    end if;

    # 定时发放的时间
    select deduct * 60 into _time_mi from earnings_manage where type = 3;

    # 开启事务
    start TRANSACTION;
    # 打开游标
    open cur;
    # 开始循环
    read_loop: LOOP
    # 提取游标的数据
    FETCH cur INTO i_id,i_num;
    # 声明结束的时候
  IF done = 1 THEN
     LEAVE read_loop;
  END IF;

    # 事务的处理
    # 获取新的id
    set _newid = REPLACE(unix_timestamp(current_timestamp(3)),‘.‘,‘‘);
    set i_num = FLOOR( _stay_out * i_num / _tb_num);
    # 添加个人收益
    IF i_num != 0 THEN
            set _amount = _amount+i_num;
            INSERT INTO `earnings_record` (`creator`, `user_id`, `status`, `amount`, `create_date`) VALUES (‘10000‘,i_id,‘0‘,i_num, NOW());
    end if;
    end LOOP read_loop;

    # 添加总收益
    INSERT INTO `earnings_issue` (`id`, `stay_out`, `amount`, `other_id`, `updater`, `update_date`, `creator`, `create_date`, `deduct`, `earnings_sum`, `time_out`) VALUES (_newid, _stay_out, _amount, NULL, ‘10000‘, NOW(), ‘10000‘, NOW(),_total_money - _stay_out, _total_money, _time_mi);

    # 给订单表绑定任务
    update other_order set issue_id = _newid where ISNULL(issue_id);

    # 如果事务发生错误，就进行回滚
    IF err=1 THEN
            # 如果发生回滚就表示发生发生错误
            set result=‘发生了回滚,不进行发放‘;
            ROLLBACK;
    ELSE
        commit;
    end if;
    #关闭游标
  CLOSE  cur;

END

原文地址：https://www.cnblogs.com/chengyangyang/p/10382941.html