Setting and Retrieving Data

元数据库数据的设置与获取

最新推荐文章于 2021-01-24 08:30:25 发布

Rayking

最新推荐文章于 2021-01-24 08:30:25 发布

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文章标签： structure parameters attributes buffer methods input

本文链接：https://blog.youkuaiyun.com/Rayking/article/details/11446

博客介绍了元数据库中数据的设置与获取方法。可通过调用SetData方法设置数据，该方法参数包含METADATA_RECORD结构。此结构也用于接收数据，调用GetData或EnumData方法时需传入其指针。GetAllData方法可从键中获取多个数据条目。

Platform SDK: Internet Information Services 5.1

Setting and Retrieving Data

You can set data in the metabase by calling the SetData method. This method takes as one of its parameters a METADATA_RECORD structure, which contains information about the data (its identifier, attributes, user type, data type, a pointer to the data, and so on). By setting values for the members of the METADATA_RECORD structure when it is passed as an input parameter to the SetData method, you can specify the type of and storage method for the data. For example, you can specify that the data be stored in a secure manner by setting the METADATA_SECURE flag in the structure's dwMDAttributes member.

In addition to specifying the data to be retrieved, the METADATA_RECORD structure is also used to receive data from the metabase. When you call the GetData or EnumData methods, you pass in a pointer to a METADATA_RECORD structure to specify the data to be retrieved, and to receive the data. Your program must allocate the buffer into which the data will be retrieved, and pass a pointer to it in the pbMDData member of the METADATA_RECORD structure.

The GetAllData method retrieves multiple data entries from a key. In this case, you can use parameters of the GetAllData method to specify the data to be retrieved, and provide a buffer where the method returns an array of METADATA_GETALL_RECORD structures.

Platform SDK Release: Janurary 2002