Question

我正在使用分页搜索结果，但出于某种原因，我的搜索脚本无效。我似乎找不到将LIMIT $start, $display放在我的搜索查询代码中的正确位置，我把它放在我的代码中，它显示分页错误。有人可以帮助我吗？

这是我的PHP＆amp;部分。 MySQL搜索代码。

$mysqli = mysqli_connect("localhost", "root", "", "sitename");
mysqli_select_db($mysqli, "sitename");

    $search_explode = explode(" ", $search);

    foreach($search_explode as $search_each) {
        $x++;
        if($x == 1){
            $construct .= "article_content LIKE '%$search_each%' OR title LIKE '%$search_each%' OR summary LIKE '%$search_each%'";
        } else {
            $construct .= "OR article_content LIKE '%$search_each%' OR title LIKE '%$search_each%' OR summary LIKE '%$search_each%'";
        }

    }

$construct = "SELECT users.*, users_articles.* FROM users_articles
              INNER JOIN users ON users_articles.user_id = users.user_id
              WHERE $construct";
$run =  mysqli_query($mysqli, $construct);

$foundnum = mysqli_num_rows($run);

SQL语句。

SELECT users.*, users_articles.* FROM users_articles INNER JOIN users ON users_articles.user_id = users.user_id WHERE article_content LIKE '%find%' OR title LIKE '%find%' OR summary LIKE '%find%'OR article_content LIKE '%this%' OR title LIKE '%this%' OR summary LIKE '%this%'OR article_content LIKE '%article%' OR title LIKE '%article%' OR summary LIKE '%article%' LIMIT 0, 10

Answer 1

SELECT的基本语法是：

SELECT [fields]
FROM [tables [JOIN tables]]
WHERE [conditions]
GROUP BY [fields]
HAVING [conditions]
ORDER BY [fields]
LIMIT [limit]

所以，在WHERE条件之后的最后。

以下是显示full syntax。

的文档

Answer 2

您是否还记得在构建查询时在字符串片段中插入空格？请记住，PHP不会将任何内容放入您自己没有放入的字符串中。

$x = 'a';
$x .= 'b';

为您提供ab，而不是a[space]b。如果输入了多个搜索字词，则$construct将会出现语法错误，因为后续OR将直接附加到之前添加的搜索字词的末尾。你最终会得到类似的东西：

[...snip...] OR summary LIKE '%$search_each%OR article_content LIKE[...snip...]
                                           ^^--syntax error here.

如果您附加限制子句而不确定查询结尾与您追加的“LIMIT X，Y”文本之间是否有空格，则同样适用。

Answer 3

这应显示前10行：

SELECT      users.*, users_articles.* FROM users_articles
INNER JOIN  users ON users_articles.user_id = users.user_id
WHERE       article_content LIKE '%something%'
LIMIT       0, 10

将LIMIT子句更改为以下内容应显示11到20之间的行：

LIMIT       10, 10

另请注意，您可能应该将$construct字符串转义为上面评论中建议的@Col. Shrapnel。这是为了避免SQL injection。

此外，您可能希望使用Full Text Indexing进行调查。

Answer 4

$mysqli = mysqli_connect("localhost", "root", "", "sitename");
mysqli_select_db($mysqli, "sitename");

    $search_explode = explode(" ", $search);

    foreach($search_explode as $search_each) {
        $x++;
        if($x == 1){
            $construct .= " article_content LIKE '%$search_each%' OR title LIKE '%$search_each%' OR summary LIKE '%$search_each%'";
        } else {
            $construct .= " OR article_content LIKE '%$search_each%' OR title LIKE '%$search_each%' OR summary LIKE '%$search_each%'";
        }

    }

$construct = "SELECT users.*, users_articles.* FROM users_articles
              INNER JOIN users ON users_articles.user_id = users.user_id
              WHERE $construct";
$construct .= " LIMIT 0, 10" ; // replace 0, 10 with your variables

$run =  mysqli_query($mysqli, $construct);

$foundnum = mysqli_num_rows($run);

MySQL限制问题

4 个答案: