Mysql 使用用户ID数组添加/更新db列的SQL代码

我在WP中创建了一个自定义数据库，在这里我希望根据ID创建用户的追随者和追随者列表

$table_name = $wpdb->prefix . 'addon_users';

        $sql = "CREATE TABLE $table_name (
            id mediumint(9) NOT NULL AUTO_INCREMENT,
            user_id bigint(20) NOT NULL,
            username bigint(20) NOT NULL,
            following bigint(20) NOT NULL,
            followers bigint(20) NOT NULL,          
            PRIMARY KEY  (id),
            UNIQUE KEY id (id)
        ) $charset_collate;";

public function cgc_follow_user( $current_user = 0, $user_to_follow = 0  ) {

            ...

            $args = array(
                'user_id'   => $current_user,
                'following' => $user_to_follow
            );

            $this->add_follower( $args );
        }

我的AJAX调用：

public function addon_ajax_follow_me() {

            check_ajax_referer( 'km-ajax-create-nonce', 'security' );   

            $current_user   = get_current_user_id();
            $target_user    = isset( $_POST['data-follow-user'] ) ? $_POST['data-follow-user'] : false;

            if( ! empty( $_POST['data-follow-user'] ) ) {           
                $this->cgc_follow_user( $current_user, $target_user );
            }       

            wp_die();   

    }

public function cgc_follow_user( $current_user = 0, $user_to_follow = 0  ) {

            ...

            $args = array(
                'user_id'   => $current_user,
                'following' => $user_to_follow
            );

            $this->add_follower( $args );
        }

遵循用户功能：

public function cgc_follow_user( $current_user = 0, $user_to_follow = 0  ) {

            ...

            $args = array(
                'user_id'   => $current_user,
                'following' => $user_to_follow
            );

            $this->add_follower( $args );
        }

此函数用于更新数据库以及我需要帮助的地方

public function cgc_follow_user( $current_user = 0, $user_to_follow = 0  ) {

            ...

            $args = array(
                'user_id'   => $current_user,
                'following' => $user_to_follow
            );

            $this->add_follower( $args );
        }

public function add_follower( $args = array() ) {

            global $wpdb;

            $defaults = array(
                'user_id'       => '',
                'following'     => ''
            );

            $args = wp_parse_args( $args, $defaults );

            $add = $wpdb->query(
                $wpdb->prepare(
                    "INSERT INTO {$this->table} SET
                        `user_id`       = '%d',
                        `following`     = '%d'
                    ;",
                    absint( $args['user_id'] ),
                    absint( $args['following'] )
                )
            );

            if ( $add )
                return $wpdb->insert_id;

            return false;
        }

每当一个用户跟随另一个用户时，就会在数据库中创建一个新条目。但我希望构建一个用户ID数组。大概是这样的：

public function cgc_follow_user( $current_user = 0, $user_to_follow = 0  ) {

            ...

            $args = array(
                'user_id'   => $current_user,
                'following' => $user_to_follow
            );

            $this->add_follower( $args );
        }

umeta_id   user_id   username    following      followers
    1         1       Yoonah     5,12,58,66      45, ...       
    2         5     Elisabeth     2,8,66         1,45, ...
    3         8        Max        45,9,99         5, ...
    4        45        Ace        1,5,87          8, ...

我偶然发现的是使用适当的SQL代码来添加ID数组

public function cgc_follow_user( $current_user = 0, $user_to_follow = 0  ) {

            ...

            $args = array(
                'user_id'   => $current_user,
                'following' => $user_to_follow
            );

            $this->add_follower( $args );
        }

另外，当“Yoonah”1出现在伊丽莎白5号之后时，伊丽莎白5号的追随者栏也应该更新为“Yoonah”1

public function cgc_follow_user( $current_user = 0, $user_to_follow = 0  ) {

            ...

            $args = array(
                'user_id'   => $current_user,
                'following' => $user_to_follow
            );

            $this->add_follower( $args );
        }

非常感谢您的帮助

public function cgc_follow_user( $current_user = 0, $user_to_follow = 0  ) {

            ...

            $args = array(
                'user_id'   => $current_user,
                'following' => $user_to_follow
            );

            $this->add_follower( $args );
        }

编辑

public function cgc_follow_user( $current_user = 0, $user_to_follow = 0  ) {

            ...

            $args = array(
                'user_id'   => $current_user,
                'following' => $user_to_follow
            );

            $this->add_follower( $args );
        }

---

我不太明白你的问题，我希望这就是你所说的

public function cgc_follow_user( $current_user = 0, $user_to_follow = 0  ) {

            ...

            $args = array(
                'user_id'   => $current_user,
                'following' => $user_to_follow
            );

            $this->add_follower( $args );
        }

更新： 我测试了这段代码，它正在工作，唯一的问题是，如果用户id不存在，我就必须输入一个用户名来创建它，但我认为，因为您使用的是当前登录WordPress的用户，所以它应该可以正常工作，而不是像我一样出现问题

public function cgc_follow_user( $current_user = 0, $user_to_follow = 0  ) {

            ...

            $args = array(
                'user_id'   => $current_user,
                'following' => $user_to_follow
            );

            $this->add_follower( $args );
        }

 Class TestThis {
    var $table = 'users';

    function __construct() {
        add_action( "wp_ajax_add_follower", array( $this, "add_follower" ) );
    }

    function add_follower() {
        $current_user = wp_get_current_user();
        $args = array(
            'user_id'   => $current_user->ID,
            'follow_to' => $_POST['user_to_follow']
        );

        $response = $this->add_following( $args );
        if ( ! empty( $response ) && $response !== FALSE ) {
            $args = array(
                'user_id'   => $_POST['user_to_follow'],
                'followed_by' => $current_user->ID
            );

            $this->add_followed_by( $args );
        }

        wp_die();
    }

    function add_following ( $args = array() ) {
        global $wpdb;

        $defaults = array(
            'user_id'       => "",
            'follow_to'     => "",
            'username'      => "Default Username"
        );

        $args = wp_parse_args( $args, $defaults );

        // First you have to check if the user already exists and return his Following Row
        $following = array();
        $existing = $wpdb->get_var( $wpdb->prepare( "SELECT following FROM {$this->table} WHERE user_id = %d", $args["user_id"] ) );

        if( ! empty( $existing ) ) {
            $following = json_decode( $existing );
        }

        // We check if this user ($args["user_id"]) is already following the $args["follow_to"] user.
        if( in_array( $args["follow_to"], $following ) )
        {
            return TRUE;
        }else{
            array_push( $following, $args['follow_to'] );
        }
        // We verify if the user exists and update the value, if he does not and we sent username, then, we create it.
        if( null === $existing && ! empty( $args['username'] ) ) {
            $wpdb->insert(
                $this->table,
                array(
                    'user_id' => $args['user_id'],
                    'username' => $args['username'],
                    'following' => json_encode( $following ),
                    'followers' => json_encode( array() )
                ),
                array(
                    '%d',
                    '%s',
                    '%s',
                    '%s'
                )
            );

            return $wpdb->insert_id;
        } else {
            $updated = $wpdb->update(
                $this->table,
                array(
                    'following' => json_encode( $following )
                ),
                array( 
                    'user_id' => $args["user_id"]
                ),
                "%s",
                "%d"
            );

            return $updated;
        }
    }

    function add_followed_by( $args, $defaults ) {
        global $wpdb;

        $defaults = array(
            'user_id'       => "",
            'followed_by'   => "",
            'username'      => "Default Username"
        );

        $args = wp_parse_args( $args, $defaults );

        // First you have to check if the user already exists and return his Followers Row
        $followers = array();
        $existing = $wpdb->get_var( $wpdb->prepare( "SELECT followers FROM {$this->table} WHERE user_id = %d", $args["user_id"] ) );

        if( ! empty( $existing ) ) {
            $followers = json_decode( $existing );
        }

        // We check if this user ($args["user_id"]) is already followed by $args["followed_by"] user.
        if( in_array( $args["followed_by"], $followers ) )
        {
            return TRUE;
        }else{
            array_push( $followers, $args['followed_by'] );
        }

        // We verify if the user exists and update the value, if he does not and we sent username, then, we create it.
        if( null === $existing && ! empty( $args['username'] ) ) {
            $wpdb->insert(
                $this->table,
                array(
                    'user_id' => $args['user_id'],
                    'username' => $args['username'],
                    'following' => json_encode( array() ),
                    'followers' => json_encode( $followers )
                ),
                array(
                    '%d',
                    '%s',
                    '%s',
                    '%s'
                )
            );

            return $wpdb->insert_id;
        } else {
            $updated = $wpdb->update(
                $this->table,
                array(
                    'followers' => json_encode( $followers )
                ),
                array( 
                    'user_id' => $args["user_id"]
                ),
                "%s",
                "%d"
            );

            return $updated;
        }
    }
}

new TestThis();

我使用以下jQuery代码对其进行了测试： *遵循ID 2的用户应该存在，或者我们应该发送用户名以添加函数后面的

public function cgc_follow_user( $current_user = 0, $user_to_follow = 0  ) {

            ...

            $args = array(
                'user_id'   => $current_user,
                'following' => $user_to_follow
            );

            $this->add_follower( $args );
        }

jQuery.post(ajaxurl, { 'action' : "add_follower", "user_to_follow" : 2 }, function() {
    console.log( "listo" );
}).fail(function(err) { console.log(err); })

如果你有问题，请告诉我

public function cgc_follow_user( $current_user = 0, $user_to_follow = 0  ) {

            ...

            $args = array(
                'user_id'   => $current_user,
                'following' => $user_to_follow
            );

            $this->add_follower( $args );
        }

更新：取消跟踪的代码

public function cgc_follow_user( $current_user = 0, $user_to_follow = 0  ) {

            ...

            $args = array(
                'user_id'   => $current_user,
                'following' => $user_to_follow
            );

            $this->add_follower( $args );
        }

if( ( $key = array_search( $args['unfollow_to'], $following ) ) !== false ) {
    unset( $following[$key] );
    reset( $following );

    $updated = $wpdb->update( $this->table,
        array(
            'following' => json_encode( $following )
        ),
        array( 
            'user_id' => $args['user_id']
        ), 
        '%s', '%d'
    );

    return $updated;

}

---

unfollow选项如下所示：

public function cgc_follow_user( $current_user = 0, $user_to_follow = 0  ) {

            ...

            $args = array(
                'user_id'   => $current_user,
                'following' => $user_to_follow
            );

            $this->add_follower( $args );
        }

更新： 这应该行得通

public function cgc_follow_user( $current_user = 0, $user_to_follow = 0  ) {

            ...

            $args = array(
                'user_id'   => $current_user,
                'following' => $user_to_follow
            );

            $this->add_follower( $args );
        }

if( ( $key = array_search( $args['unfollow_to'], $following ) ) !== false ) {
    unset( $following[$key] );
    reset( $following );

    $updated = $wpdb->update( $this->table,
        array(
            'following' => json_encode( $following )
        ),
        array( 
            'user_id' => $args['user_id']
        ), 
        '%s', '%d'
    );

    return $updated;

}

---

这是因为您是按键删除的，而应该按值删除。

我忘了告诉您，使用这种方法，我使用的是PHP的json_编码和json_解码，而不是逗号分隔的值。奇怪的是，它不起作用。明天早上我会仔细看一看；为什么更喜欢使用json_编码和json_解码，有什么具体原因吗？我更喜欢在这里使用json_编码和json_解码，因为我们可以在字段中注册一个完整的数组作为字符串，甚至，我们也可以在其中添加一个带逗号的字符串值。它更加健壮和灵活。创建逗号分隔字符串时，必须确保不要在末尾添加逗号，因为它会在数组中创建一个空项，例如23、42、53，明白了！我注意到代码仍然没有按预期工作。用户被完美地添加到数据库中，但followers和后续列的值仍然为0。你可能有什么想法吗？呵呵，我明白了！，很抱歉我忘了告诉你们，followers和following应该是一个文本字段，而不是bigint，因为它是一个字符串，将被存储在它上面。json_编码和json_解码函数所做的是将字符串转换为数组，并将数组转换为字符串。很抱歉再次打扰您，但我注意到数据库中有一些奇怪的东西，每当我单击“取消跟踪”按钮时，就会引起冲突；数组将变成一个对象。将更新我关于它的第一篇帖子：很抱歉，我这周一直很忙，您可以在$wpdb->update中使用json_encode Array$followers和json_encode Array$followers强制对象到数组的转换。谢谢！这确实解决了对象错误。我仍然很好奇为什么在下面的列中会列出引号，而在followers列中却没有；效果稍微好一点

public function cgc_follow_user( $current_user = 0, $user_to_follow = 0  ) {

            ...

            $args = array(
                'user_id'   => $current_user,
                'following' => $user_to_follow
            );

            $this->add_follower( $args );
        }