DELIMITER // 
DROP PROCEDURE IF EXISTS create_table_by_month //
CREATE PROCEDURE `create_table_by_month`()
BEGIN

  #--提前申明變量,后面會(huì)用到
    DECLARE nextMonth varchar(20);
    DECLARE nextTABLE varchar(20);
    DECLARE csql varchar(5210);
    DECLARE outputParam int;
    DECLARE tableName_1 varchar(20);
    DECLARE tableName_2 varchar(20);
    DECLARE table_prefix varchar(20);

  #--獲取下個(gè)月
  SELECT SUBSTR(replace(DATE_ADD(CURDATE(), INTERVAL 1 MONTH), '-', ''), 1, 6) INTO @nextMonth;
  #--對(duì)上面的SQL語(yǔ)句拆分分析:
  #MySQL時(shí)間函數(shù)date_add()為日期增加一個(gè)時(shí)間間隔，此sql的意思就是當(dāng)前日期增加一個(gè)月后的日期
  #select DATE_ADD(CURDATE(), INTERVAL 1 MONTH); 
  ##返回20201006
  #select replace('2020-10-06', '-', '');
  ##返回20201006
  #select replace(DATE_ADD(CURDATE(), INTERVAL 1 MONTH), '-', '');
  ##返回202010
  #SELECT SUBSTR(20201006,1,6);
  ##賦值到變量@nextMonth 中
  #SELECT SUBSTR(20201006,1,6) INTO @nextMonth;

# 表1
    #設(shè)置表前綴變量值為td_user_banks_log_
    set @table_prefix = 'td_user_banks_log_';

    #定義表1的名稱
    SET @tableName_1 = CONCAT(@table_prefix, @nextMonth);
    ##定義創(chuàng)建表的SQL語(yǔ)句
    set @csql=concat("create table if not exists ",@tableName_1,"(
        `id` int(11) NOT NULL AUTO_INCREMENT,
        `app_id` varchar(100) NOT NULL,
        `user_id` int(11) NOT NULL DEFAULT '0' COMMENT '用戶ID',
        `type` tinyint(2) NOT NULL DEFAULT '1' COMMENT '1 簽到獎(jiǎng)勵(lì) 2 活動(dòng)獎(jiǎng)勵(lì) 3 兌換',
        `gold_coin` int(11) NOT NULL,
        `remarks` varchar(200) NOT NULL DEFAULT '' COMMENT '備注',
        `create_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
        PRIMARY KEY (`id`),
        KEY `app_id` (`app_id`),
        KEY `user_id` (`user_id`),
        KEY `type` (`type`),
        KEY `create_at` (`create_at`)
      ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;");
  #PREPARE介紹：
  ##語(yǔ)句用于預(yù)備一個(gè)語(yǔ)句，并指定名稱statement_name，以后引用該語(yǔ)句。語(yǔ)句名稱對(duì)大小寫(xiě)不敏感。
  ##preparable_stmt可以是一個(gè)文字字符串，也可以是一個(gè)包含了語(yǔ)句文本的用戶變量。該文本必須表現(xiàn)為一個(gè)單一的SQL語(yǔ)句，而不是多個(gè)語(yǔ)句。
  PREPARE create_stmt from @csql; 
    EXECUTE create_stmt;
  DEALLOCATE PREPARE create_stmt;

# 表2 和表1是同樣的SQL，此處不做介紹:
    set @table_prefix = 'td_sign_log_';

    SET @tableName_2 = CONCAT(@table_prefix, @nextMonth);

    set @csql=concat("create table if not exists ",@tableName_2,"(
      `id` int(11) NOT NULL AUTO_INCREMENT,
      `app_id` varchar(100) NOT NULL,
      `user_id` int(11) NOT NULL,
      `day` int(11) NOT NULL DEFAULT '0' COMMENT '天',
      `sign_type` tinyint(2) NOT NULL DEFAULT '1' COMMENT '1 簽到 2 補(bǔ)簽 3 累計(jì)獎(jiǎng)勵(lì)',
      `type` tinyint(2) NOT NULL DEFAULT '1' COMMENT '1 金幣',
      `num` int(11) NOT NULL DEFAULT '0',
      `data_id` int(11) NOT NULL DEFAULT '0',
      `create_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
      PRIMARY KEY (`id`),
      KEY `app_id` (`app_id`),
      KEY `user_id` (`user_id`),
      KEY `type` (`type`),
      KEY `data_id` (`data_id`),
      KEY `create_at` (`create_at`),
      KEY `sign_type` (`sign_type`),
      KEY `day` (`day`)
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;");

    PREPARE create_stmt from @csql; 
    EXECUTE create_stmt;
    DEALLOCATE PREPARE create_stmt;

    SELECT COUNT(1) INTO @outputParam FROM information_schema.`TABLES` WHERE TABLE_NAME in (@tableName_1, @tableName_2);
    SELECT @outputParam;

END //
delimiter ;

#--每月創(chuàng)建一個(gè)當(dāng)月表的定時(shí)任務(wù):

create EVENT `create_table_by_month` ON SCHEDULE EVERY 1 MONTH STARTS '2020-09-06 12:40:00' ON COMPLETION NOT PRESERVE ENABLE DO call create_table_by_month();

#查看創(chuàng)建存儲(chǔ)過(guò)程的SQL語(yǔ)句:

show create PROCEDURE create_table_by_month\G

#刪除存儲(chǔ)過(guò)程:

DROP PROCEDURE IF EXISTS create_table_by_month;

#刪除計(jì)劃任務(wù)

drop event create_table_by_month1;