自定义查询的方法
默认的查询
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global $wpdb;
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$comments = $wpdb->get_results( "SELECT * FROM $wpdb->comments WHERE comment_approved = '1' Limit 0, 10" );
所以：
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global $wpdb;
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$user_id = 57;
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$comments = $wpdb->get_results( $wpdb->prepare( "SELECT * FROM $wpdb->comments WHERE comment_approved = '1' AND user_id = '%d' Limit 0, 10", $user_id ) );
还可以：
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global $wpdb;
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$user_ids = array( 57, 105, 567, 2820 );
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$comments = $wpdb->get_results( $wpdb->prepare( "SELECT * FROM $wpdb->comments WHERE comment_approved = '1' AND user_id IN(%s) Limit 0, 10", $user_ids ) );
还可以对其进行缓存以提升加载速度：
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global $wpdb;
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$user_ids = array( 57, 105, 567, 2820 );
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$key = md5( serialize( $user_ids ) );
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$comments = get_transient( $key );
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if( false === $comments ) {
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$comments = $wpdb->get_results( $wpdb->prepare( "SELECT * FROM $wpdb->comments WHERE comment_approved = '1' AND user_id IN(%s) Limit 0, 10", $user_ids ) );
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set_transient( $key, $comments, 10800 );
使用HOOK过滤的方法
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add_filter( 'comments_clauses', 'pw_comments_by_users', 10, 2 );
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$comments = get_comments();
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remove_filter( 'comments_clauses', 'pw_comments_by_users' );
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function pw_comments_by_users( $clauses, $wp_comment_query ) {
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$clauses['where'] .= ' AND user_id IN (57,105,567,2820)';
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return $clauses;
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}
结论
使用自定义查询并对查询进行缓存的方法性能较好，使用HOOK过滤的方法比较简单，但是注意一定要在查询后移除HOOK，否则会影响到其它地方对于评论的查询。
(责任编辑：最模板) |
