Question

我在编写xpath查询时遇到问题。我正在尝试获得具有serviceTechnology ='DSL'的产品。

我试过了：

//offering/productDefinition[definitionID='Product_1' or definitionID='Product_2' or definitionID='Product_3' or definitionID='Product_4' and serviceTechnologyList[serviceTechnology='DSL']]

//offering/productDefinition[definitionID='Product_1' or definitionID='Product_2' or definitionID='Product_3' or definitionID='Product_4' and serviceTechnologyList='DSL']

这是基于此处的其他问题列表。我一直得到“谓词格式错误”。

<offeringList>
    <offering>
        <productDefinition>
            <definitionID>Product_1</definitionID>
            <productLineList>
                <productLine>DSL</productLine>
            </productLineList>
            <serviceTechnologyList>
                <serviceTechnology>DSL</serviceTechnology>
            </serviceTechnologyList>
        </productDefinition>
    </offering>
    <offering>
        <productDefinition>
            <definitionID>Product_2</definitionID>
            <productLineList>
                <productLine>DSL</productLine>
            </productLineList>
            <serviceTechnologyList>
                <serviceTechnology>IPTV</serviceTechnology>
            </serviceTechnologyList>
        </productDefinition>
    </offering>
    <offering>
        <productDefinition>
            <definitionID>Product_3</definitionID>
            <productLineList>
                <productLine>DSL</productLine>
            </productLineList>
            <serviceTechnologyList>
                <serviceTechnology>DSL</serviceTechnology>
            </serviceTechnologyList>
        </productDefinition>
    </offering>
    <offering>
        <productDefinition>
            <definitionID>Product_4</definitionID>
            <productLineList>
                <productLine>DSL</productLine>
            </productLineList>
        </productDefinition>
    </offering>
</offeringList>

任何帮助都将不胜感激。

Answer 1

我一眼就看不到任何错误 - 两种工作:)，也许你没有逃避某些事情？

在此处尝试查询以确保工作正常：xpath tester

Answer 2

为什么不呢：

/offeringList/offering/productDefinition[serviceTechnologyList/serviceTechnology = 'DSL']

如果您想具体了解definitionID，可以执行以下操作：

//offeringList/offering/productDefinition[serviceTechnologyList/serviceTechnology = 'DSL'][definitionID='Product_1' or definitionID='Product_2' or definitionID='Product_3' or definitionID='Product_4']

Answer 3

您需要使用括号来定义and和or运算符的优先级：

//offering/productDefinition[(definitionID='Product_1' or definitionID='Product_2' or definitionID='Product_3' or definitionID='Product_4') and serviceTechnologyList[serviceTechnology='DSL']]

如果您只想要拥有productDefinition的{{1}}个节点，您可以简化为：

serviceTechnology='DSL'

Answer 4

@ icyrock.com指出，问题在于布尔运算符：and的优先级高于or。

此表达式使用另一种方法来匹配XPath 1.0中的序列：

//offering/productDefinition
             [contains('|Product_1|Product_2|Product_3|Product_4|',
                       concat('|',definitionID,'|')) 
              and serviceTechnologyList/serviceTechnology='DSL']

如果ID列表太大，您可以使用：

//offering/productDefinition
             [starts-with(definitionID,'Product_')
              and contains('|1|2|3|4|6|8|22|',
                           concat('|',
                                  substring-after(definitionID,
                                                  'Product_'),
                                  '|')) 
              and serviceTechnologyList/serviceTechnology='DSL']

或者如果有范围：

//offering/productDefinition
             [starts-with(definitionID,'Product_')
              and substring-after(definitionID,'Product_') >= 1
              and 4 >= substring-after(definitionID,'Product_')
              and serviceTechnologyList/serviceTechnology='DSL']

带谓词的xpath查询

4 个答案: