MYSQL批量创建表的存储过程

Posted 2020-10-31 小昌君

 

因为业务需要，创建了100个表，但是这些表的结构都是一样的，作为程序员，就是要解决这种重复劳动。然而这种事情还要单独写个php脚本的话太麻烦了吧，所以就干脆学了一下直接用mysql存储过程怎么实现：

首先是创建表的：（ LPAD(`@i`, 2, ‘0‘)的作用 是将1,2,3这些数字转化为‘01‘,‘02‘,‘03‘）

DROP PROCEDURE IF EXISTS `create_tables`;

CREATE PROCEDURE create_tables ()
BEGIN

DECLARE `@i` INT (11);
DECLARE `@createSql` VARCHAR (2560);SET `@i` = 0;
WHILE `@i` < 100 DO
    -- 创建表        
SET @createSql = CONCAT(
    "CREATE TABLE IF NOT EXISTS guess_record",
    LPAD(`@i`, 2, ‘0‘),
    "(
  `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `userid` int(12) unsigned NOT NULL COMMENT ‘用户ID‘,
  `issue` int(10) unsigned NOT NULL COMMENT ‘期号‘,
  `options_id` int(10) unsigned NOT NULL COMMENT ‘选项ID‘,
  `guess_time` int(10) unsigned NOT NULL COMMENT ‘答题时间‘,
  `is_stat` tinyint(4) NOT NULL COMMENT ‘是否统计过‘,
  PRIMARY KEY (`id`),
  KEY `issue` (`issue`) USING BTREE,
  KEY `userid` (`userid`) USING BTREE
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
"
);
PREPARE stmt FROM @createSql;
EXECUTE stmt;
SET `@i` = `@i` + 1;

END WHILE;

END

然后是批量删除表的（嘿嘿，搞事情）

DROP PROCEDURE IF EXISTS `drop_tables`;

CREATE PROCEDURE drop_tables ()
BEGIN

DECLARE `@i` INT (11);
DECLARE `@dropSql` VARCHAR (2560);

SET `@i` = 0;
WHILE `@i` < 100 DO
    -- 创建表        
SET @dropSql = CONCAT("DROP TABLE IF EXISTS guess_record",LPAD(`@i`, 2, ‘0‘));
PREPARE stmt FROM @dropSql;
EXECUTE stmt;
SET `@i` = `@i` + 1;

END WHILE;

END

我用这个存储过程其实就是一次性的，所以完整的过程是 1、创建存储过程 2、执行存储过程（批量创建表）3、删除存储过程

 

#1:创建存储过程
DROP PROCEDURE IF EXISTS `create_tables`;
DELIMITER $$ //定义结束符 
CREATE PROCEDURE create_tables ()
BEGIN

DECLARE `@i` INT (11);
DECLARE `@createSql` VARCHAR (2560);

SET `@i` = 0;
WHILE `@i` < 100 DO
    -- 创建表        
SET @createSql = CONCAT(
    "CREATE TABLE IF NOT EXISTS guess_record",
    LPAD(`@i`, 2, ‘0‘),
    "(
  `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `userid` int(12) unsigned NOT NULL COMMENT ‘用户ID‘,
  `issue` int(10) unsigned NOT NULL COMMENT ‘期号‘,
  `options_id` int(10) unsigned NOT NULL COMMENT ‘选项ID‘,
  `guess_time` int(10) unsigned NOT NULL COMMENT ‘答题时间‘,
  `is_stat` tinyint(4) NOT NULL COMMENT ‘是否统计过‘,
  PRIMARY KEY (`id`),
  KEY `issue` (`issue`) USING BTREE,
  KEY `userid` (`userid`) USING BTREE
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
"
);
PREPARE stmt FROM @createSql;
EXECUTE stmt;
SET `@i` = `@i` + 1;

END WHILE;

END $$
DELIMITER ;  //结束符改为； 
#2:执行存储过程  
CALL `create_tables`();
#3:删除存储过程
DROP PROCEDURE IF EXISTS `create_tables`;