如何获取ODataV2属性的聚合值？ Main.view.xml Chart.fragment.xml Main.controller.js 服务的结构GWSAMPLE

问题描述

我想显示一个图表（sap.viz.ui5.controls.VizFrame），以可视化OData服务中的数据。但是，必须对服务的数据进行操作。请参见下面的示例：

Main.view.xml

<mvc:View controllerName="demo.chart.controller.Main" xmlns:mvc="sap.ui.core.mvc" displayBlock="true" xmlns="sap.m">
    <Shell id="shell">
        <App id="app">
            <pages>
                <Page id="page" title="Chart Demo">
                    <content></content>
                </Page>
            </pages>
        </App>
    </Shell>
</mvc:View>

Chart.fragment.xml

<c:FragmentDeFinition xmlns:c="sap.ui.core" xmlns:viz="sap.viz.ui5.controls" xmlns:viz.data="sap.viz.ui5.data"
    xmlns:viz.Feeds="sap.viz.ui5.controls.common.Feeds">
    <viz:VizFrame uiConfig="{applicationSet:'fiori'}" vizType='donut'>
        <viz:dataset>
            <viz.data:FlattenedDataset data="{manipulatedData>/}">
                <viz.data:dimensions>
                    <viz.data:DimensionDeFinition name="Gender" value="{manipulatedData>gender}"/>
                </viz.data:dimensions>
                <viz.data:measures>
                    <viz.data:MeasureDeFinition name="Amount" value="{manipulatedData>amount}"/>
                </viz.data:measures>
            </viz.data:FlattenedDataset>
        </viz:dataset>
        <viz:Feeds>
            <viz.Feeds:FeedItem uid="color" type="Dimension" values="Gender"/>
            <viz.Feeds:FeedItem uid="size" type="Measure" values="Amount"/>
        </viz:Feeds>
    </viz:VizFrame>
</c:FragmentDeFinition>

Main.controller.js

sap.ui.define([
    "sap/ui/core/mvc/Controller","sap/ui/model/json/JSONModel","sap/ui/core/Fragment"
],function (Controller,JSONModel,Fragment) {
    "use strict";

    return Controller.extend("demo.chart.controller.Main",{
        onInit: function () {
            const mDefault = this.getownerComponent().getModel();
            const mManipulatedData = new JSONModel([{
                gender: "F",amount: 0
            },{
                gender: "M",{
                gender: "X",amount: 12
            }]);
            this.getView().setModel(mManipulatedData,"manipulatedData");

            console.log(this.getView().getModel("manipulatedData"));

            mDefault.read("/ContactSet",{
                success: oData => {
                    const aManipulatedData = mManipulatedData.getData();

                    oData.results.forEach(entry => {
                        aManipulatedData.forEach(type => {
                            if (entry.Sex === type.gender) {
                                type.amount++
                            }
                        })
                    });

                    Fragment.load({
                        name: "demo.chart.view.Chart",controller: this
                    }).then(oFragment => {
                        this.getView().addDependent(oFragment);
                        this.byId("page").addContent(oFragment);
                    });
                }
            })
        }
    });
});

服务的结构（`GWSAMPLE_BASIC/ContactSet`）

{
    "d": {
        "results": [
            {
                "__Metadata": {
                    "id": "https://sapes5.sapdevcenter.com/sap/opu/odata/IWBEP/GWSAMPLE_BASIC/ContactSet(guid'0050568c-901d-1eda-bcae-e8394de7e116')","uri": "https://sapes5.sapdevcenter.com/sap/opu/odata/IWBEP/GWSAMPLE_BASIC/ContactSet(guid'0050568c-901d-1eda-bcae-e8394de7e116')","type": "GWSAMPLE_BASIC.Contact"
                },"Address": {
                    "__Metadata": {
                        "type": "GWSAMPLE_BASIC.CT_Address"
                    },"City": "Walldorf","PostalCode": "69190","Street": "Robert-Koch-Straße","Building": "1","Country": "DE","Addresstype": "02"
                },"ContactGuid": "0050568c-901d-1eda-bcae-e8394de7e116","BusinessPartnerID": "0100000000","Title": "","FirstName": "Karl","MiddleName": "","LastName": "Müller","Nickname": "","Initials": "","Sex": "M","PhoneNumber": "0622734567","Faxnumber": "0622734004","EmailAddress": "do.not.reply@sap.com","Language": "EN","DateOfBirth": null,"ToBusinessPartner": {
                    "__deferred": {
                        "uri": "https://sapes5.sapdevcenter.com/sap/opu/odata/IWBEP/GWSAMPLE_BASIC/ContactSet(guid'0050568c-901d-1eda-bcae-e8394de7e116')/ToBusinessPartner"
                    }
                }
            }
        ]
    }
}

因此，如您所见，我只对Sex属性的聚合值感兴趣。我当前的解决方案是遍历实体集的所有条目，并在自定义JSON模型中增加属性。这不仅表现不佳，因为您需要在客户端进行繁重的工作，而且还要求您立即了解图表中显示的数据的所有可能值。是否可以通过OData查询来执行此操作，还是必须在SAP系统中使用已编译的数据创建一个新的实体集？

解决方法

OData应该能够进行计数和分组，如以下问题所述：OData v4 groupby with $count

但是我怀疑您的SAP OData服务在大多数情况下不会实现完整的OData规范。

您可以通过不使用两个嵌套的for循环来改善js，如下所示：

mGender = {};
oData.results.forEach(entry => {
    if (!mGender[entry.Sex])
        {mGender[entry.Sex] = 0
    }
    mGender[entry.Sex]++
});

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