判断字段是否存在:
- 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.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();
来源: http://www.bubuko.com/infodetail-3094298.html