PHP MySQLi异步查询

以下代码已经简化,原始代码太冗长了,因为类依赖性和所有这些,所以在这里列出.另外请假设已经设置了mysqli_handle连接的引用.

$query_1 = "SHOW TABLES FROM moxedo";
$query_2 = "CREATE TABLE `moxedo`.`mox_config_n85ad3` (`id` INT(11) UNSIGNED NOT NULL AUTO_INCREMENT,`group_id` INT(3) UNSIGNED NOT NULL,`is_enabled` INT(1) UNSIGNED NOT NULL,`tag` VARCHAR(255) NOT NULL,`name` VARCHAR(80) NOT NULL,`value` VARCHAR(255) NOT NULL,`description` TEXT NOT NULL,`init_params` TEXT NOT NULL,`datetime_added` DATETIME NOT NULL,`datetime_lastmodified` DATETIME NOT NULL,`timestamp_univ` BIGINT(14) NOT NULL,PRIMARY KEY ( `id` ) ) ENGINE = INNODB
";
$query_3 = "ALTER TABLE `moxedo`.`mox_config_n85ad3` ADD UNIQUE `ix_u_tag_oq` ( `tag` )";
$query_4 = "SHOW TABLES FROM moxedo";

if (!$mysqli_stmt_obj = $mysqli_handle->query($query_1)) 
{
   printf("Error: %sn",$mysqli_handle->error);
}

if (!$mysqli_stmt_obj = $mysqli_handle->query($query_2,MYSQLI_ASYNC)) 
{
   printf("Error: %sn",$mysqli_handle->error);
}

if (!$mysqli_stmt_obj = $mysqli_handle->query($query_3,$mysqli_handle->error);
}

if (!$mysqli_stmt_obj = $mysqli_handle->query($query_4)) 
{
   printf("Error: %sn",$mysqli_handle->error);
}

对Query 1的调用通过OK.对查询2的调用也通过OK.

但是,当我尝试执行查询3和查询4时,我得到“命令不同步;你现在无法运行此命令”错误.从我的在线研究中我发现了一些关于使用mysqli_free_result但查询2和查询3的信息不返回结果集.

我需要做什么才能正确完成异步调用,以便我可以进行多次调用而不会出现此错误？