mysql判断列是否存在

本篇文章将通过存储过程来判断列（字段）是否存在。请看详情。

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判断字段是否存在：DROP PROCEDURE IF EXISTS schema_change;DELIMITER //CREATE PROCEDURE schema_change() BEGIN DECLARECurrentDatabase VARCHAR(100);SELECT DATABASE() INTO CurrentDatabase;IF NOT EXISTS (SELECT * FROM information_schema.columns WHERE table_schema=CurrentDatabase AND table_name = 'rtc_order' AND column_name = 'IfUpSend') THENALTER TABLE rtc_orderADD COLUMN `IfUpSend` BITNOT NULLDEFAULT 0 COMMENT '是否上传 是否上传';END IF;END//DELIMITER ;CALL schema_change();mysql 判断字段否存在，如果存在就修改字段：DROP PROCEDURE IF EXISTS proc_tempPro;if(@count>0) THENalter table 表名 change column `旧列名` `新列名` varchar(30) comment '字段说明';end if;end;call proc_tempPro;DROP PROCEDURE IF EXISTS proc_tempPro;通过存储过程判断字段是否存在，不存在则增加：DROP PROCEDURE IF EXISTS pro_AddColumn;CREATE PROCEDURE pro_AddColumn() BEGINIF NOT EXISTS(SELECT 1 FROM information_schema.columns WHERE table_name='component' AND COLUMN_NAME='PRINT_CHECK_STATUS') THENALTER TABLE component ADD PRINT_CHECK_STATUS int(10) default 0;END IF;IF NOT EXISTS(SELECT 1 FROM information_schema.columns WHERE table_name='component' AND COLUMN_NAME='PRINT_CHECK_TIME') THENALTER TABLE component ADD PRINT_CHECK_TIME datetime NULL;END IF;IF NOT EXISTS(SELECT 1 FROM information_schema.columns WHERE table_schema=podcloud AND table_name='component' AND COLUMN_NAME='PRINT_CHECK_BACK_REASON') THENALTER TABLE component ADD PRINT_CHECK_BACK_REASON varchar(500) default null;END IF;END;CALL pro_AddColumn;DROP PROCEDURE pro_AddColumn;------------------------------------------------------------------------------------------------DROP PROCEDURE IF EXISTS pro_AddIndex;DELIMITER; CREATE PROCEDURE pro_AddIndex() BEGIN IF NOT EXISTS (SELECT * FROM information_schema.statistics WHERE table_schema=CurrentDatabase AND table_name = 'rtc_phototype' AND index_name = 'index_name') THENALTER TABLE `rtc_Phototype` ADD INDEX index_name ( `imgtype` );END IF;END; DELIMITER;CALL pro_AddIndex(); Drop procedure pro_AddIndex;以上就是mysql判断列是否存在的详细内容，更多请关注小潘博客其它相关文章！