MySQL实际项目中常用的 DDL 模板

CREATE TABLE `hot_campaign` (
    `id` BIGINT NOT NULL AUTO_INCREMENT COMMENT '主键',
    `campaign_name` VARCHAR(64) NOT NULL COMMENT '活动名称',
    `site` VARCHAR(32) NOT NULL COMMENT '站点',
    `status` TINYINT NOT NULL DEFAULT 1 COMMENT '状态：1启用 0停用',
    `created_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
    `created_by` VARCHAR(16) DEFAULT NULL COMMENT '创建人工号',
    `updated_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',
    `updated_by` VARCHAR(16) DEFAULT NULL COMMENT '更新人工号',
    PRIMARY KEY (`id`),
    KEY `idx_site` (`site`),
    KEY `idx_status` (`status`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='营销活动表';

ALTER TABLE `hot_campaign`
ADD COLUMN `last_updated_staff` VARCHAR(16) DEFAULT NULL COMMENT '最后更新人工号';

ALTER TABLE `hot_campaign`
DROP COLUMN `last_updated_staff`;

ALTER TABLE `hot_campaign`
MODIFY COLUMN `campaign_name` VARCHAR(128) NOT NULL COMMENT '活动名称';

ALTER TABLE `hot_campaign`
CHANGE COLUMN `status` `campaign_status` TINYINT NOT NULL DEFAULT 1 COMMENT '活动状态';

ALTER TABLE `hot_campaign`
ALTER COLUMN `status` SET DEFAULT 1;

ALTER TABLE `hot_campaign`
ADD INDEX `idx_name` (`campaign_name`);

ALTER TABLE `hot_campaign`
ADD INDEX `idx_site_status` (`site`, `status`);

ALTER TABLE `hot_campaign`
ADD UNIQUE INDEX `uk_site_name` (`site`, `campaign_name`);

ALTER TABLE `hot_campaign`
DROP INDEX `idx_site_status`;

ALTER TABLE `coupon`
ADD CONSTRAINT `fk_coupon_campaign`
    FOREIGN KEY (`campaign_id`)
    REFERENCES `hot_campaign` (`id`)
    ON DELETE CASCADE
    ON UPDATE CASCADE;

ALTER TABLE `coupon`
DROP FOREIGN KEY `fk_coupon_campaign`;

RENAME TABLE `hot_campaign` TO `hot_campaign_v2`;

ALTER TABLE `hot_campaign`
CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;

DROP TABLE IF EXISTS `hot_campaign`;