Question

我正在开发我的第一个Wordpress-Plugin，现在，它应该做的只是：

安装时：创建表格。

我的代码：

if ( ! class_exists ( 'My_Plugin' ) )
{
class My_Plugin
{
    /**
     * Construct the plugin object
    **/
    public function __construct ()
    {
        // register actions
    }

    /**
     * Activate the plugin
    **/
    public static function activate ()
    {
        global $wpdb;

        $tableName = tableName ( $wpdb );

        if ( ! tableExists ( $wpdb , $tableName ) ) 
        {
            $sql = "CREATE TABLE " . $tableName . " (
                id INT(9) UNSIGNED NOT NULL AUTO_INCREMENT,
                any_column VARCHAR(255) NOT NULL,
                UNIQUE KEY id (id)
            );";

            require_once(ABSPATH . 'wp-admin/includes/upgrade.php');
            dbDelta($sql);
        }
    }

    /**
     * Deactivate the plugin
    **/     
    public static function deactivate ()
    {
        // Nothing
    }


    // Return table name
    public function tableName ( $wpdb , $tableName = 'new_table' )
    {
        $tableName = $wpdb->prefix . $tableName;
        return $tableName;
    }


    // Check if table already exists
    public function tableExists ( $wpdb , $tableName )
    {
        try
        {
            $result = $wpdb->query("SELECT 1 FROM $tableName LIMIT 1");
        } 
        catch ( Exception $e )
        {
            return FALSE;
        }

        return $result !== FALSE;
    }
}
}

if ( class_exists ( 'My_Plugin' ) )
{
    // Activation and Deactivation hooks
    register_activation_hook ( __FILE__ , array ( 'My_Plugin' , 'activate' ) );
    register_deactivation_hook ( __FILE__ , array ( 'My_Plugin' , 'deactivate' ) );

    // Instantiate the plugin class
    $plugin_template = new My_Plugin ();
}

但是会返回此错误：

Fatal error: Call to undefined function tableName() in /www/htdocs/path/to/file.php on line

但我无法看到我的错误，我真的不确定为什么这个功能未定义...任何人都可以帮我这个？

问候!!

Answer 1

tableName()不是一个全局函数，它是My_Plugin的一种方法。简单的方法是将activate()和deactivate()转换为非静态函数，并使用$this->tableName()。

// Instantiate the plugin class
$plugin_template = new My_Plugin ();

register_activation_hook ( __FILE__ , array ( $plugin_template , 'activate' ) );
register_deactivation_hook ( __FILE__ , array ( $plugin_template , 'deactivate' ) );

和

public function activate ()
{
    global $wpdb;

    $tableName = $this->tableName ( $wpdb );

    if ( ! $this->tableExists ( $wpdb , $tableName ) ) 
    {
        $sql = "CREATE TABLE " . $tableName . " (
            id INT(9) UNSIGNED NOT NULL AUTO_INCREMENT,
            any_column VARCHAR(255) NOT NULL,
            UNIQUE KEY id (id)
        );";

        require_once(ABSPATH . 'wp-admin/includes/upgrade.php');
        dbDelta($sql);
    }
}

否则，您需要在My_Plugin中构建activate()的新实例，然后通过该$class->tableName()访问它。

您可以查看manual了解详情。

Answer 2

此处插件激活中创建表的功能
register_activation_hook（ __ FILE __ ，＆＃39; create_table＆＃39;）;
function create_tabletag() { require_once(ABSPATH . 'wp-admin/includes/upgrade.php'); $query="CREATE TABLE IF NOT EXISTS tab_list( tab_id INT NOT NULL AUTO_INCREMENT PRIMARY KEY, name VARCHAR(40), isvisible VARCHAR(20) )ENGINE = MYISAM CHARACTER SET utf8 COLLATE utf8_general_ci;"; dbDelta($query); //This function use to create table }

Php - 开发Wordpress插件

2 个答案: