在PHP中的逗号分隔值列表上运行select [英] Running a select on a list of comma separated values in PHP

问题描述

我在数据库上运行选择查询时遇到一些问题。一些数据保存为逗号分隔值的列表，例如：

I am having a bit of a problem running a select query on a database. Some of the data is held as a list of comma separated values, an example:

Table: example_tbl
| Id | People | Children |
| 1  | 1,2,3  |  8,10,3  |
| 2  | 7,6,12 |  18,19,2 |

我想要运行的一个例子：

And an example of the kind of thing I am trying to run:

<?php
    include 'class.php';
    $selection = 1;
    $db = new DbClass;
    $tbl_name = 'example_tbl';
    $sql = "SELECT * FROM $tbl_name WHERE ".$selection." IN People";
    $result = $db->query($sql);
    $print_r($result);
?>

在找到'1'后，上的脚本应该返回第1行

The script above should return row 1 after finding a '1' in the People column but clearly I have mucked it up.

我遇到的问题是我认为我有IN语句向后，即我想这个方法将是如果$ selection是一个逗号分隔（imploded）列表，而不是我想使用它的方式选择值。

The issue I am having is that I think I have the IN statement backwards, i.e. I THINK this method would be to select values if $selection was a comma separated (imploded) list, rather than the way round I am trying to use it.

我不知道对于我从上面的db类发送和接收什么太重要，但是如果你想知道，它只是一个简单的脚本运行所有相关位并返回结果数组。现在它不返回任何东西，因为它没有找到匹配

I don't know if it's too important about what I am sending and receiving from the db class above, but if you wanted to know, it's just a simple script that runs all relevant bits and returns an array of the result. at the moment it's returning nothing because it's not finding a match

感谢提前任何你可以告诉我。

Thanks in advance for anything you can tell me.

干杯
-Dave

Cheers -Dave

推荐答案

坚持在列中使用逗号分隔数据值的疯狂习惯，而不是正确地标准化他们的数据库设计。 总是 会导致问题。

Why do people insist on this insane habit of comma-separated data values in a column rather than properly normalising their database design. It always leads to problems.

SELECT * 
  FROM $tbl_name 
 WHERE CONCAT(',',People,',') LIKE '%,".$selection.",%'";

或

SELECT * 
  FROM $tbl_name 
 WHERE FIND_IN_SET(".$selection.",People);

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