CREATE TABLE `comment` (
`id` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT 'id',
`parent_id` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '父级评论id(查一级,二级的时候方便)',
`user_id` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '用户id',
`comment_content` varchar(500) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '评论内容',
`comment_date` datetime(0) NULL DEFAULT NULL COMMENT '评论日期',
`bus_id` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '业务id',
`type` tinyint(0) NULL DEFAULT NULL COMMENT '业务类型(1.文章 2...)',
`is_author` tinyint(0) NULL DEFAULT NULL COMMENT '是否作者(1作者,0普通用户)',
`replied_id` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '被回复评论id',
`replied_user_id` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '被回复用户id',
PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci COMMENT = '评论表' ROW_FORMAT = Dynamic;
SELECT
p.*,
b.id c_id,
u.id c_user_id,
u.avatar_url c_avatar_url,
u.nickname c_nickname,
b.comment_content c_comment_content,
b.comment_date c_comment_date,
IF(ISNULL(b.id),b.id,(select count(*) from sys_like where bus_id = b.id)) c_like_num,
IF(ISNULL(b.id),b.id,(select count(*) from `comment` where replied_id = b.id )) c_comment_num,
IF(ISNULL(b.user_id),b.user_id,IFNULL((SELECT nickname FROM wx_user WHERE id = b.replied_user_id AND del_flag = 0 ),'用户已注销')) replied_user_nickname
FROM
(
SELECT
p.id,
u.id user_id,
u.avatar_url,
u.nickname,
p.comment_content comment_content,
p.comment_date comment_date,
p.is_author,
COUNT( c.id ) comment_num,
IF(ISNULL(p.id),p.id,(select count(*) from sys_like where bus_id = p.id)) like_num
FROM
`comment` p
JOIN wx_user u ON u.id = p.user_id AND u.del_flag = 0
LEFT JOIN `comment` c ON p.id = c.parent_id
WHERE
p.bus_id = '1' AND p.parent_id IS NULL
GROUP BY
p.id
) p
LEFT JOIN `comment` b ON p.id = b.parent_id
LEFT JOIN wx_user u ON u.id = b.user_id AND u.del_flag = 0
一级评论只需要知道,业务类型、业务id、评论内容
即可,
回复时只需要知道,业务类型、业务id、评论内容、回复的评论id
即可
客户端1 :分页查询第一页数据
客户端2:插入了一条新的评论
问题:客户端1
的第二
页数据和第一
页的数据存在重复
原因:假设第一页数据下标 1-9 。客户端2插入数据0后 导致第一页数据下标为 0-8,因此第二页出现下标9
解决:表中记录一个时间戳,前端在调接口时传递时间戳,然后查询的时候多个条件:<=时间戳即可