mysql新建数据时判断表,字段,索引是否存在

-- 新建表时判断表是否存在

CREATE TABLE If Not Exists `表名` (
`id`  int(10) NOT NULL AUTO_INCREMENT ,
`plan_id`  int(10) NULL  ,
`bet_num`  varchar(255) NULL  ,
`vr_win_data`  varchar(255) NULL COMMENT  ,
PRIMARY KEY (`id`)
);

-- 新建字段时判断字段是否存在

CREATE PROCEDURE sp_update_888()
BEGIN
	IF NOT EXISTS (SELECT * FROM information_schema.columns WHERE table_schema = DATABASE()  AND table_name = '表名' AND column_name = '字段名') THEN
			 ALTER TABLE 表名 ADD 字段名 int(1) default 0  ;
	END IF;
end;
call sp_update_888();
drop procedure IF EXISTS  sp_update_888;



-- 新建索引时判断索引是否存在


CREATE PROCEDURE sp_update_888()
BEGIN
	IF NOT EXISTS (SELECT * FROM information_schema.statistics WHERE table_schema=DATABASE() AND table_name = '表名' AND index_name = '索引名') THEN  
		ALTER TABLE `chenrui_lottery_open_time` ADD INDEX 索引名( `索引字段` );
	END IF;  
end;
call sp_update_888();
drop procedure IF EXISTS  sp_update_888;