代码之家 › 专栏 › 技术社区 › Jithin Vijayan

与php和mysql一对多关系中的分页

one-to-many pagination database mysql php

Jithin Vijayan · 技术社区 · 6 年前

两个表之间有一对多关系。使用自定义映射器,我将这些记录映射如下。

$result  = [
   0=>[
        "name"=>"jithin",
        "phone"=>"907856",
        "messages"=>[
                      0=>[
                          "title"=>"text messgae"
                         ],
                      1=>[
                          "title"=>"Data messgae"
                         ]
                    ]
      ],
    1=>[
        "name"=>"Rijin",
        "phone"=>"90247856",
        "messages"=>[
                      0=>[
                          "title"=>"text messgae"
                         ],
                      1=>[
                          "title"=>"Data messgae"
                         ]
                    ]
      ]
]

"SELECT u.* , m.* FROM user u INNER JOIN messages m ON m.userId = u.id
 WHERE m.date BETWEEN "12-12-2015" AND "12-12-2018" LIMIT 0, 6;

此查询将返回如下数据

userId | name | messages|
-------|------|---------|
1      |jithin| hai     |
1      |jithin| hello   |
1      |jithin| Why?    |
2      |Rijin | hai     |
2      |Rijin | Where   |
2      |Rijin | Why?    |
-------------------------

我使用的是php和mysql5.7。

2 回复 | 直到 6 年前

antoine.lange 6 年前

    SELECT u.id, u.userName , m.message
    FROM user u 
    INNER JOIN messages m ON m.userId = u.id
    INNER JOIN (SELECT u.id as user_id FROM user u LIMIT 0, 6) as users
        ON users.user_id = u.id
    WHERE m.date BETWEEN '12-12-2015' AND '12-12-2018';

Jithin Vijayan 6 年前

最后,我找到了这个问题的答案。

"SELECT u.* , m.* FROM user u 
 INNER JOIN messages m ON m.userId = u.id
 INNER JOIN (SELECT DISTINCT u.id as user_id FROM user u 
             INNER JOIN messages m ON m.userId = u.id
             WHERE m.date BETWEEN "12-12-2015" 
             AND "12-12-2018" LIMIT 0, 6) 
 AS distinct_users ON distinct_users.user_id=u.id
 WHERE m.date BETWEEN "12-12-2015" AND "12-12-2018";

如果你有另一个简单的选择。请在这里张贴。

推荐文章

Jacco · 未能格式化我的日期以在php中正确工作

1 年前