mysql判断表字段或索引是否存在，然后修改

PROCEDURE IF EXISTS schema_change; DELIMITER // CREATE PROCEDURE schema_change() BEGIN DECLARE CurrentDatabase 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‘) THEN ALTER TABLE rtc_order ADD COLUMN `IfUpSend` BIT NOT NULL DEFAULT 0 COMMENT ‘是否上传 是否上传‘; END IF; END// DELIMITER ; CALL schema_change();

 

判断索引是否存在：

DROP PROCEDURE IF EXISTS schema_change;  
DELIMITER //
CREATE PROCEDURE schema_change() BEGIN 
DECLARE  CurrentDatabase VARCHAR(100);
SELECT DATABASE() INTO CurrentDatabase;
IF NOT EXISTS (SELECT * FROM information_schema.statistics WHERE table_schema=CurrentDatabase AND table_name = ‘rtc_phototype‘ AND index_name = ‘index_name‘) THEN  
   ALTER TABLE `rtc_Phototype` ADD INDEX index_name ( `imgtype` );
END IF;  
END//  
DELIMITER ;  
CALL schema_change();

 

mysql判断表字段或索引是否存在，然后修改

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