Question

我有以下xml：

<response>
<id>...</id>
<category_id>...</category_id>
<name>...</name>
<detail>
    <resource>
        <label>...</label>
        <value>...</value>
    </resource>
    <resource>
        <label>...</label>
        <value>...</value>
    </resource>
</detail>
<price>...</price>
<currency>...</currency>
</response>

我需要从一个XmlListModel

获取id，name以及label和value

我有以下代码：

XmlListModel {
    id: model
    query:"/response"
    source:"xml source"

    XmlRole { name: "name"; query: "name/string()"  }
    XmlRole { name: "id"; query:"id/number()"  }
    XmlRole { name: "label"; query: "detail/resource/label/string()" }
    XmlRole { name: "value"; query:"detail/resource/value/string()" }
}

这段代码有什么问题？感谢。

Answer 1

问题是，xpath查询detail/resource/label/string()没有选择一个节点，因为有多个resource个节点。如果您不需要所有resource个节点，则只能使用detail/resource[1]/label/string()选择第一个节点。

如果您需要所有resource个节点，则可以使用其他XmlModel：

import QtQuick 1.0

Item {

    property string xmlData:
        "<response>
            <id>1234</id>
            <category_id>...</category_id>
            <name>The Name</name>
            <detail>
                <resource>
                    <label>Res1</label>
                    <value>1</value>
                </resource>
                <resource>
                    <label>Res2</label>
                    <value>2</value>
                </resource>
            </detail>
            <price>...</price>
            <currency>...</currency>
        </response>"

    // model for general data
    XmlListModel {
        id: model

        xml: xmlData

        query:"/response"

        XmlRole { name: "name"; query: "name/string()"  }
        XmlRole { name: "id";   query: "id/number()"  }
    }

    // model for resource data
    XmlListModel {
        id: resModel

        xml: xmlData

        query: "/response/detail/resource"

        XmlRole { name: "label"; query: "label/string()" }
        XmlRole { name: "value"; query: "value/string()" }
    }
}

qml中的xml基础和相对查询组合

1 个答案: