php - 如何更新 WordPress 数据

Question

我现在正在制作 BD police law exam , 我想添加考试计数系统，但我的代码无法正常工作，我是 Mysql 初学者。

$charset_collate = $wpdb->get_charset_collate();
$variable211 = $wpdb->prefix . "exam_count";        
$variable2111 = "CREATE TABLE IF NOT EXISTS $variable211 (
    id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
    countt DOUBLE NOT NULL
) $charset_collate;";
require_once( ABSPATH . 'wp-admin/includes/upgrade.php' );
dbDelta( $variable2111 );

这是我的代码:

$myrows1 = $wpdb->get_results( "SELECT * FROM $variable211 WHERE id=1" );
$count=$myrows1->countt;
$count=$count+1;
if(!$myrows1){
    $sql1 = $wpdb->query( $wpdb->prepare( "INSERT INTO $variable211 ( countt) VALUES ( %f ) ",1));
}else{
    $sql2= $wpdb->query( $wpdb->prepare( "UPDATE INTO SELECT * FROM $variable211 WHERE ID = 1 ( countt ) VALUES ( %f )",$count));               
}`

Answer 1

您的代码将如下所示，

global $wpdb;
$myrows1 = $wpdb->get_results( "SELECT * FROM $variable211 WHERE id=1" );
$count=$myrows1->countt;
$count=$count+1;
if(!$myrows1){
	$sql1 = $wpdb->insert(
		$variable211,
		array(
			'countt' => '1'
		),
	    array(  
	    	'%d'
	    )
	);
}
else{
	$sql2 = $wpdb->update(
		$variable211,
		array(
			'countt' => $count
		),
		array(
			'ID' => '1'
		),
	    array(  
	    	'%d'
	    )
	);
}

不要忘记在文件开头添加 global $wpdb;。