Question

希望在json中列出mysql结果。需要按字母顺序排列

json需要像这样：

[
  {
    "letter": "A",
    "result": [
      {
        "name": "A&W"
      }
    ]
  },
  {
    "letter": "B",
    "result": [
      {
        "name": "Best Buy "
      }
    ]
  }
]

需要对mysql结果进行分组，并在“结果”下添加相应的字母。基于mysql中“name”列的第一个字母。

继承我的代码：

    $sql = "SELECT name AS nameletter FROM stores ORDER BY FirstLetter";


    $result = mysql_query($sql);

 while($data = mysql_fetch_assoc($result)){

       echo $data['name'];

    }

-

Answer 1

您始终可以使用该名称的第一个字母，然后使用它来订购您的查询。

SELECT name, SUBSTR(name, 1, 1) FirstLetter AS nameletter FROM stores ORDER BY FirstLetter

所以这将返回类似

的内容

Jason, J
Henry, H
Harry, H
Larry, L
Lenny, L

在PHP中，您需要构建这些值的数组，然后您应该可以非常轻松地遍历数组并获取每个字母的名称。

Answer 2

您正在使用非常弃用的mysql函数，将来会删除它们。您应该开始将您的知识转移到PDO接口以进行数据库访问。在使用PDO的许多好处中，它提供了一些很好的功能，可以在这里受益。应该注意的是，我在下面指出的用法并不是最有效的方式，如果你正在处理长列表，你不应该这样做。但是，知道如何让php为你完成大部分工作很有趣。

给定一个表'stores'，其中包含一列'name'和以下样本值：

name
----
Black Pencil theatre Company
Bluebird Films
Foggy Camel Films
Fork and Spoon Marketing
Opaque Cat Web Design
Transparent Toaster Marketing
Content Panda Company
For Yours and Everyone Else's Eyes Only

您可以先使用查询以有意义的顺序检索数据：

SELECT LEFT( name, 1 ) AS FirstLetter, name FROM stores ORDER BY FirstLetter, name

FirstLetter   name
B             Black Pencil theatre Company
B             Bluebird Films
C             Content Panda Company
F             Foggy Camel Films
F             For Yours and Everyone Else's Eyes Only
F             Fork and Spoon Marketing
O             Opaque Cat Web Design
T             Transparent Toaster Marketing

使用PDO类，我们可以直接将数据分组：

<?php
$dbh = new PDO('mysql:host=localhost;dbname=sotest', 'testuser', 'testpass');
$stmt = $dbh->query('SELECT left(name,1) as FirstLetter, name FROM stores ORDER BY FirstLetter, name');
$results = $stmt->fetchAll(PDO::FETCH_COLUMN | PDO::FETCH_GROUP);

/* $results is now =
array(5) {
  ["B"]=>
  array(2) {
    [0]=>
    string(28) "Black Pencil theatre Company"
    [1]=>
    string(14) "Bluebird Films"
  }
  ["C"]=>
  array(1) {
    [0]=>
    string(21) "Content Panda Company"
  }
  ["F"]=>
  array(3) {
    [0]=>
    string(17) "Foggy Camel Films"
    [1]=>
    string(39) "For Yours and Everyone Else's Eyes Only"
    [2]=>
    string(24) "Fork and Spoon Marketing"
  }
  ["O"]=>
  array(1) {
    [0]=>
    string(21) "Opaque Cat Web Design"
  }
  ["T"]=>
  array(1) {
    [0]=>
    string(29) "Transparent Toaster Marketing"
  }
}*/

正如您所看到的，PDO fetchAll已经为您分组了这些。因为您希望它们采用特定的格式，您可以对它们进行简单的循环，而不必担心查看或比较这些值：

$structured = array();
foreach ($results as $firstLetter => $companies) {
    $structured[] = array(
        'letter' => $firstLetter,
        'result' => array_map(
            function($c) { return array('name' => $c); },
            $companies
            )
    );
}
$structured = json_encode($structured);

/* $structured is now =
[{
    "letter": "B",
    "result": [{
        "name": "Black Pencil theatre Company"
    }, {
        "name": "Bluebird Films"
    }]
}, {
    "letter": "C",
    "result": [{
        "name": "Content Panda Company"
    }]
}, {
    "letter": "F",
    "result": [{
        "name": "Foggy Camel Films"
    }, {
        "name": "For Yours and Everyone Else's Eyes Only"
    }, {
        "name": "Fork and Spoon Marketing"
    }]
}, {
    "letter": "O",
    "result": [{
        "name": "Opaque Cat Web Design"
    }]
}, {
    "letter": "T",
    "result": [{
        "name": "Transparent Toaster Marketing"
    }]
}]
*/

如何按字母顺序对mysql结果进行分组？

2 个答案: