Int64类型的Web服务中的空值 [英] Blank value in web service for Int64 type

问题描述

我使用具有数字元素的Web服务。 Delphi wsdl导入器将其设置为Int64。

Web服务允许此元素为空。然而，因为它被定义为Int64，当我在Delphi中使用Web服务而不设置它的值时，它默认为0，因为它是一个Int64。但是我需要它为空，Web服务将不接受0的值（0被定义为无效并且由Web服务返回错误）。

如果类型为Int64，如何传递空值？

解决方案

空白年龄（示例）

 < E06_14>< / E06_14> 
  

可能有一个特殊的含义，例如未知的年龄。

在这种情况下，真正的问题是如何在Delphi方面使字段无法使用。

From JM Babet的这篇文章：

nil的支持一直是一个持续的问题。
Delphi的几种内置类型不可空。所以我们选择为这些案例使用一个类
（不优雅，但它有效）。所以随着Delphi 2007
的最新更新，我添加了几个TXSxxxx类型来帮助这个。基本上：
TXSBoolean，TXSInteger，TXSLong等。TXSString已经在那里，但
它没有注册。现在它是。导入WSDL时，您必须
启用使用'TXSString为简单的nillable类型'选项使
导入器切换到TXSxxxx类型。在命令行上是
-0z +选项。

导入WSDL向导的DocWiki 还显示了与可累加元素相关的两个选项：

• 处理nillable和可选元素 - 选中此选项可使WSDL导入器生成有关可选
  和可追加属性的相关信息。该信息由SOAP运行时
  用于允许某些属性为零。




• 使用TXSString进行简单的nillable类型 - WSDL标准允许简单类型在Delphi或NULL，C ++中为零，而Delphi
  和C ++不允许这样做。检查此选项以使WSDL导入程序
  通过使用包装器类的实例来克服此限制。

I consume a web service that has a numeric element. The Delphi wsdl importer sets it up as Int64.

The web service allows this element to be blank. However, because it is defined as Int64, when I consume the web service in Delphi without setting a value for it, it defaults to 0 because it's an Int64. But I need it to be blank and the web service will not accept a value of 0 (0 is defined as invalid and returns an error by the web service).

How can I pass a blank value if the type is Int64?

解决方案

Empty age (example)

<E06_14></E06_14>

could have a special meaning, for example be "unknown" age.

In this case, the real question is how to make the field nillable on the Delphi side.

From this post of J.M. Babet:

Support for 'nil' has been an ongoing issue. Several built-in types of Delphi are not nullable. So we opted to use a class for these cases (not elegant but it works). So with the latest update for Delphi 2007 I have added several TXSxxxx types to help with this. Basically: TXSBoolean, TXSInteger, TXSLong, etc. TXSString was already there but it was not registered. Now it is. When importing a WSDL you must enable the Use 'TXSString for simple nillable types' option to make the importer switch to TXSxxxx types. On the command line it is the "-0z+" option.

The DocWiki for the Import WSDL Wizard also shows two options related to nillable elements:

• Process nillable and optional elements - Check this option to make the WSDL importer generate relevant information about optional and nillable properties. This information is used by the SOAP runtime to allow certain properties be nil.

• Use TXSString for simple nillable types - The WSDL standard allows simple types to be nil, in Delphi or NULL, in C++, while Delphi and C++ do not allow that. Check this option to make the WSDL importer overcome this limitation by using instances of wrapper classes.

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