FetchXML了解不同

本文介绍了FetchXML了解不同的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我正在学习FetchXML，目前是它的新手。

I am learning FetchXML and am currently new to it.

我尝试查看位于，但我觉得它没有很大帮助

I tried looking at the documentation located here but I did not find it very helpful

这行是什么意思：

<fetch version="1.0" output-format="xml-platform" mapping="logical" distinct="true">

mapping = logical 是什么部分意思？
distinct = true 部分是什么意思？

What does the mapping="logical" part mean?What does the distinct="true" part mean?

推荐答案

按照我们有两个枚举值，即内部&逻辑映射属性。我们必须在查询&中使用 mapping = logical

As per FetchXML schema we have two enum values namely internal & logical for mapping attribute. We have to use mapping="logical" in our queries & internal may be for Platform usage (my guess).

    <xs:attribute name="mapping">
      <xs:simpleType>
        <xs:restriction base="xs:NMTOKEN">
          <xs:enumeration value="internal" />
          <xs:enumeration value="logical" />
        </xs:restriction>
      </xs:simpleType>
    </xs:attribute>

distinct = true 将删除在结果集中重复值。这类似于SQL概念。

distinct="true" will remove the duplicate values in your resultset. This is similar to SQL concept.

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