Question

我很困惑如何在MySQL查询中创建循环。

我有这个问题：

<?php
    $arr = explode(',', $features);
    $query_spicy = "
    SELECT wposts.*             
        FROM $wpdb->posts wposts
    INNER
        JOIN ( SELECT post_id
               FROM $wpdb->postmeta wpostmeta
                    WHERE ('; 
                                ( wpostmeta.meta_key = 'features' AND wpostmeta.meta_value LIKE '%test1%' )
                            OR 
                                ( wpostmeta.meta_key = 'features'AND wpostmeta.meta_value LIKE '%test2%' )
                            OR 
                                ( wpostmeta.meta_key = 'features'AND wpostmeta.meta_value LIKE '%test3%' )
                            OR
                                ( wpostmeta.meta_key = 'features'AND wpostmeta.meta_value LIKE '%test4%' )
                            OR
                                ( wpostmeta.meta_key = 'features'AND wpostmeta.meta_value LIKE '%test5%' )
                    ')
                    GROUP BY post_id
            ) AS t ON t.post_id = wposts.ID WHERE wposts.post_status = 'publish' AND wposts.post_type = 'book' ORDER BY wposts.post_date DESC";
?>

我想用for循环生成波纹管部分动态：

( wpostmeta.meta_key = 'features' AND wpostmeta.meta_value LIKE '%test1%' ) OR 
( wpostmeta.meta_key = 'features' AND wpostmeta.meta_value LIKE '%test2%' ) OR 
( wpostmeta.meta_key = 'features' AND wpostmeta.meta_value LIKE '%test3%' ) OR
( wpostmeta.meta_key = 'features' AND wpostmeta.meta_value LIKE '%test4%' ) OR
( wpostmeta.meta_key = 'features' AND wpostmeta.meta_value LIKE '%test5%' )

注意：test1，test2，test3，test4和test5，我来自$arr。

我希望你理解我的问题，如果你帮助我，我会感激的。

谢谢：）

Answer 1

尝试类似

的内容

$arr = explode(',', $features);
$conditions = array();

foreach($arr as $feature){
    $condition[] = "( wpostmeta.meta_key = 'features' AND wpostmeta.meta_value LIKE '{$feature}' )";
}
$query = "SELECT ...". join("OR",$conditions);

但你可以简单地做一些像wpostmeta.meta_key ='feature'和wpostmet IN（$ features）

我认为第二种解决方案更好更快。

Answer 2

试试这个

wpostmeta.meta_key =＆＃34;。$ features。＆＃34;和wpostmeta.meta_value LIKE＆＃39;％test1％＆＃39;

Answer 3

<?php
    $arr = explode( ',', $features );

    $query_spicy = "
    SELECT wposts.*             
        FROM {$wpdb->posts wposts}
    INNER
        JOIN ( SELECT post_id
               FROM {$wpdb->postmeta wpostmeta}
                    WHERE (";

    $tmp = array();
    foreach( $arr as $value )
    {
        $tmp[] = "( wpostmeta.meta_key = 'features' AND wpostmeta.meta_value LIKE '%{$value}%' )";
    }

    $query_spicy .= implode( ' OR ', $tmp );
    $query_spicy .= ")
                    GROUP BY post_id
            ) AS t ON t.post_id = wposts.ID WHERE wposts.post_status = 'publish' AND wposts.post_type = 'book' ORDER BY wposts.post_date DESC";
?>

Answer 4

FWIIW：

只需设置一个数组以包含您需要插入的数据，然后使用foreach循环遍历它。

$sql="SELECT wposts.*             
        FROM $wpdb->posts wposts
    INNER
        JOIN ( SELECT post_id
               FROM $wpdb->postmeta wpostmeta
                    WHERE ('; ";
foreach($arrayoftestdata as $test)
    {
    $sql.="( wpostmeta.meta_key = 'features' AND wpostmeta.meta_value LIKE '%$test%' ) OR ";
    }

$sql.="')
                    GROUP BY post_id
            ) AS t ON t.post_id = wposts.ID WHERE wposts.post_status = 'publish' AND wposts.post_type = 'book' ORDER BY wposts.post_date DESC";

如何在MySQL查询中编写PHP代码

4 个答案: