如何使用AWS SDK for PHP Version 2为SimpleDB做条件放置

Question

我有以下代码，将新项目输入SimpleDB的域。我正在使用AWS SDK For PHP Version 2。

  $client->putAttributes(array(
     'DomainName' => $domainName,
     'ItemName'   => $uniqueid,
     'Attributes' => array(
         array('Name' => 'USER_ID', 'Value' => $uniqueid, 'Replace' => true),
         array('Name' => 'EMAIL', 'Value' => $email, 'Replace' => true),
         array('Name' => 'CREATED', 'Value' => $date, 'Replace' => true),
         array('Name' => 'LAST_UPDATED', 'Value' => $date, 'Replace' => true),
     )
  ));

我如何做一个条件放?我想要的条件是，电子邮件不存在。就像:预期。Name => EMAIL预期。Exists => False，但是我不知道语法

这是API文档的链接。我不太了解他们，无法执行这个。http://docs.aws.amazon.com/aws-sdk-php-2/latest/class-Aws.SimpleDb.SimpleDbClient.html _putAttributes

谢谢!

Answer 1

这似乎行得通。我现在得到一个条件检查失败错误。

$client->putAttributes(array(
    'DomainName' => $domainName,
    'ItemName'   => $uniqueid,
    'Attributes' => array(
        array('Name' => 'USER_ID', 'Value' => $uniqueid, 'Replace' => true),
        array('Name' => 'EMAIL', 'Value' => $email, 'Replace' => true),
        array('Name' => 'CREATED', 'Value' => $date, 'Replace' => true),
        array('Name' => 'LAST_UPDATED', 'Value' => $date, 'Replace' => true),
    ),
    'Expected' => array('Name' => 'EMAIL', 'Exists' => false),
));