學(xué)習(xí)記錄

ALTER TABLE `cx_promotion_city` ADD COLUMN `bu_id` int(11) NOT NULL DEFAULT 0 COMMENT '事業(yè)部ID';

ALTER TABLE `cx_promotion_city` ADD COLUMN `utime` int(11) NOT NULL DEFAULT 0 COMMENT '更改時(shí)間';

alter table cx_promotion_city drop index idx_promotion_city;

alter table cx_promotion_city add index idx_promotion_bu(promotion_id,bu_id);

alter table cx_promotion_city add unique index idx_promotion_city_bu(promotion_id, city_id, bu_id);

DROP PROCEDURE IF EXISTS schema_change;

DELIMITER //

CREATE PROCEDURE schema_change()

BEGIN

DECLARE CurrentDatabase VARCHAR(100);

SELECT DATABASE() INTO CurrentDatabase;

IF EXISTS (SELECT * FROM information_schema.columns WHERE table_schema=CurrentDatabase AND table_name = 'cx_promotion_city' AND column_name = 'bu_id')

THEN

ALTER TABLE `cx_promotion_city` DROP COLUMN `bu_id`;

END IF;

IF EXISTS (SELECT * FROM information_schema.columns WHERE table_schema=CurrentDatabase AND table_name = 'cx_promotion_city' AND column_name = 'utime')

THEN

ALTER TABLE `cx_promotion_city` DROP COLUMN `utime`;

END IF;

IF EXISTS (SELECT * FROM information_schema.statistics WHERE table_schema=CurrentDatabase AND table_name = 'cx_promotion_city' AND index_name = 'idx_promotion_bu')

THEN

ALTER TABLE `cx_promotion_city` DROP INDEX `idx_promotion_bu`;

END IF;

IF EXISTS (SELECT * FROM information_schema.statistics WHERE table_schema=CurrentDatabase AND table_name = 'cx_promotion_city' AND index_name = 'idx_promotion_city_bu')

THEN

ALTER TABLE `cx_promotion_city` DROP INDEX `idx_promotion_city_bu`;

END IF;

IF NOT EXISTS (SELECT * FROM information_schema.statistics WHERE table_schema=CurrentDatabase AND table_name = 'cx_promotion_city' AND index_name = 'idx_promotion_city')

THEN

ALTER TABLE `cx_promotion_city` ADD UNIQUE INDEX `idx_promotion_city` (`promotion_id`, `city_id`);

END IF;

END//

DELIMITER ;

CALL schema_change();

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