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() BEGIN IF NOT EXISTS(SELECT 1 FROM information_schema.columns WHERE table_name='component' AND COLUMN_NAME='PRINT_CHECK_STATUS') THEN ALTER 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') THEN ALTER 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') THEN ALTER TABLE component ADD PRINT_CHECK_BACK_REASON varchar(500) default null; END IF; END; CALL pro_AddColumn; DROP PROCEDURE pro_AddColumn;
通过存储过程判断索引是否存在,不存在则增加:
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') THEN ALTER TABLE `rtc_Phototype` ADD INDEX index_name ( `imgtype` ); END IF; END;
DELIMITER; CALL pro_AddIndex();
Drop procedure pro_AddIndex;
插入语句判断是否存在,不存在则插入:
insert into permission(id,name,navigation_id,parentid) select '130','印前审查',null,'1' from DUAL WHERE NOT EXISTS(SELECT * FROM permission WHERE id='130'); insert into navigation(id,name,parent,path,seq_num,sub_sys,url) select '39','参数配置',11,'/3/11',1,3,null from DUAL WHERE NOT EXISTS(SELECT * FROM navigation WHERE id='39');