create table `product_info`(
    `product_id` varchar(32) not null, --企业级的用varchar，自己玩的项目可以用自增的但数量大了可能不够用
    `product_name` varchar(64) not null comment ‘商品名称‘,
    `product_price` decimal(8,2) not null comment ‘单价‘,
    `product_stock` int not null comment ‘库存‘,
    `product_description` varchar(64) comment ‘描述‘,
    `product_icon` varchar(512) comment ‘小图‘,
    `category_type` int not null comment ‘类目编号‘,
    `create_time` timestamp not null default current_timestamp comment ‘创建时间‘,
    `update_time` timestamp not null default current_timestamp on update current_timestamp comment ‘更新时间‘,  --MYSQL5.7才可以default current_timestamp
    primary key (`product_id`)
) comment ‘商品表‘;

create table `product_category`(
    `category_id` int not null auto_increment,  -- 类目不太可能爆多，所以可以自增
    `category_name` varchar(64) not null comment ‘类目名字‘,
    `category_type` int not null comment ‘类目编号‘,
    `create_time` timestamp not null default current_timestamp comment ‘创建时间‘,
    `update_time` timestamp not null default current_timestamp on update current_timestamp comment ‘更新时间‘,  --MYSQL5.7才可以default current_timestamp
    primary key (`category_id`)
    unique key `uqe_category_type` (`category_type`) --类目是唯一的
) comment ‘类目表‘

create table `order_master`(
    `order_id` varchar(32) not null,
    `buyer_name` varchar(32) not null comment ‘买家名字‘,
    `buyer_phone` varchar(32) not null comment ‘买家电话‘,
    `buyer_address` varchar(128) not null comment ‘买家地址‘,
    `buyer_openid` varchar(64) not null comment ‘买家微信openid‘,
    `order_amount` decimal(8,2) not null comment ‘订单总金额‘，
    `order_status` tinyint(3) not null default ‘0‘ comment ‘订单状态，默认0新下单‘,
    `pay_status` tinyint(3) not null default ‘0‘ comment ‘支付状态，默认0未支付‘,
    `create_time` timestamp not null default current_timestamp comment ‘创建时间‘,
    `update_time` timestamp not null default current_timestamp on update current_timestamp comment ‘更新时间‘,  --MYSQL5.7才可以default current_timestamp
    primary key (`order_id`),
    key `idx_buyer_openid` (`buyer_openid`)
) comment ‘订单表‘;

create table `order_detail`(
    `detail_id` varchar(32) not null,
    `order_id` varchar(32) not null,
    `product_id` varchar(32) not null,
    `product_name` varchar(64) not null comment ‘商品名字‘,
    `product_price` decimal(8,2) not null comment ‘商品价格‘,
    `product_quantity` int not null comment ‘商品数量‘，
    `product_icon` varchar(512) comment ‘商品小图‘,
    `create_time` timestamp not null default current_timestamp comment ‘创建时间‘,
    `update_time` timestamp not null default current_timestamp on update current_timestamp comment ‘更新时间‘,  --MYSQL5.7才可以default current_timestamp
    primary key (`detail_id`),
    key `idx_order_id`(`order_id`)
) comment ‘订单详情表‘;