PHP MySQLi - 按情况排序不正常工作

Question

这是我的代码：

   $q = '8gb pro';

   $sforeach = explode(' ', $q);

   $treffer = "when (titel LIKE '% $q %') then 1";

    $sortstring = "";       
    foreach($sforeach as $sf)
    {
        $sortstring .= "(titel LIKE '% $sf %') AND";
    }
    $sortstring = rtrim($sortstring, ' AND');

    $sortstring2 = "";
    foreach($sforeach as $sf)
    {
        $sortstring2 .= "(beschreibung LIKE '% $sf %') AND";
    }
    $sortstring2 = rtrim($sortstring2, ' AND');

    $sort = "order by case
                   $treffer
                    when $sortstring then 2
                    when $sortstring2 then 3
                    else 4
                    end, views DESC";

当我搜索 8gb pro 时，即使条件 when $sortstring then 2 应该在 when $sortstring2 then 3 之前，然后把它放在相反的位置对吗？

Answer 1

也许您预期的排序逻辑是执行多个 ORDER BY 条件。

在搜索字符串的左侧和右侧添加 space 将意味着当第一个词或最后一个词匹配时，您将无法准确匹配。出于这个原因，我必须敦促您使用较慢的函数 REGEXP 及其冗长的单词边界标记。

代码：(Demo) (A basic SQLFiddle Demo)

$q = '8gb pro';
$parts = explode(' ', $q);

$sort = "ORDER BY";
$sort .= " (CASE WHEN `titel` REGEXP '[[:<:]]{$q}[[:>:]]' THEN 1 ELSE 2 END),";
$sort .= " (CASE WHEN `titel` REGEXP '[[:<:]]" . implode("[[:>:]]' AND `titel` LIKE '[[:<:]]", $parts) .  "[[:>:]]' THEN 1 ELSE 2 END),";
$sort .= " (CASE WHEN `beschreibung` REGEXP '[[:<:]]" . implode("[[:>:]]' AND `beschreibung` LIKE '[[:<:]]", $parts) .  "[[:>:]]' THEN 1 ELSE 2 END),";
$sort .= " `views` DESC";

echo $sort;

输出：

ORDER BY
 (CASE WHEN `titel` REGEXP '[[:<:]]8gb pro[[:>:]]' THEN 1 ELSE 2 END),
 (CASE WHEN `titel` REGEXP '[[:<:]]8gb[[:>:]]' AND `titel` LIKE '[[:<:]]pro[[:>:]]' THEN 1 ELSE 2 END),
 (CASE WHEN `beschreibung` REGEXP '[[:<:]]8gb[[:>:]]' AND `beschreibung` LIKE '[[:<:]]pro[[:>:]]' THEN 1 ELSE 2 END),
 `views` DESC

一个link explaining the word boundary syntax.

PHP MySQLi - 按情况排序不正常工作

PHP MySQLi - order by case not rly working

php

sql

mysqli

case

sql-order-by