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Integrate Real-Time Access to Azure Data Catalog in SAPUI5 MVC Apps
Use the built-in ODataModel class in SAPUI5 to create Web apps that reflect changes to Azure Data Catalog data in real time.
In this article we show how to use the CData API Server to write SAPUI5 apps that leverage the capabilities of the Azure Data Catalog API, without writing to a back-end database. The API Server is a lightweight Web application that runs on your server and produces OData feeds of Azure Data Catalog data. OData is the standard for real-time data access over the Web and has built-in support in SAPUI5 and OpenUI5.
Set Up the API Server
If you have not already done so, download the CData API Server. Once you have installed the API Server, follow the steps below to begin producing secure Azure Data Catalog OData services:
Connect to Azure Data Catalog
To work with Azure Data Catalog data from SAPUI5, we start by creating and configuring a Azure Data Catalog connection. Follow the steps below to configure the API Server to connect to Azure Data Catalog data:
- First, navigate to the Connections page.
-
Click Add Connection and then search for and select the Azure Data Catalog connection.
-
Enter the necessary authentication properties to connect to Azure Data Catalog.
You can optionally set the following to read the different catalog data returned from Azure Data Catalog.
Connect Using OAuth Authentication
You must use OAuth to authenticate with Azure Data Catalog. OAuth requires the authenticating user to interact with Azure Data Catalog using the browser. For more information, refer to the OAuth section in the help documentation.
- After configuring the connection, click Save & Test to confirm a successful connection.
Configure API Server Users
Next, create a user to access your Azure Data Catalog data through the API Server. You can add and configure users on the Users page. Follow the steps below to configure and create a user:
- On the Users page, click Add User to open the Add User dialog.
-
Next, set the Role, Username, and Privileges properties and then click Add User.
-
An Authtoken is then generated for the user. You can find the Authtoken and other information for each user on the Users page:
Creating API Endpoints for Azure Data Catalog
Having created a user, you are ready to create API endpoints for the Azure Data Catalog tables:
-
First, navigate to the API page and then click
Add Table
.
-
Select the connection you wish to access and click Next.
-
With the connection selected, create endpoints by selecting each table and then clicking Confirm.
Gather the OData Url
Having configured a connection to Azure Data Catalog data, created a user, and added resources to the API Server, you now have an easily accessible REST API based on the OData protocol for those resources. From the API page in API Server, you can view and copy the API Endpoints for the API:
Create the View
In this article the user views and interacts with Azure Data Catalog data through an SAPUI5 table control. Table columns will be automatically detected from the metadata retrieved from the API Server's API endpoint. We define the following table in a separate View.view.xml file:
<mvc:View
controllerName="sap.ui.table.sample.OData2.Controller"
xmlns="sap.ui.table"
xmlns:mvc="sap.ui.core.mvc"
xmlns:u="sap.ui.unified"
xmlns:c="sap.ui.core"
xmlns:m="sap.m">
<m:Page
showHeader="false"
enableScrolling="false"
class="sapUiContentPadding">
<m:content>
<Table
id="table"
selectionMode="MultiToggle"
visibleRowCount="10"
enableSelectAll="false"
rows="{/Tables}"
threshold="15"
enableBusyIndicator="true"
columns="{
path: 'meta>/dataServices/schema/[${namespace}===\'CData\']/entityType/[${name}===\'Tables\']/property',
factory: '.columnFactory'
}">
<toolbar>
<m:Toolbar>
<m:Title text="Azure Data Catalog Tables"></m:Title>
</m:Toolbar>
</toolbar>
<noData>
<m:BusyIndicator class="sapUiMediumMargin"/>
</noData>
</Table>
</m:content>
</m:Page>
</mvc:View>
Create the Model and Controller
In SAPUI5, you do not need to write any OData queries; an ODataModel instance handles the application's data access commands. The API Server then translates the queries into Azure Data Catalog API calls.
The controller processes user input and represents information to the user through a view. Define the controller in a new file, Controller.controller.js. Instantiate the model in the onInit function -- you will need to replace the placeholder values for the URL to the API Server, a user allowed to access the OData endpoint of the API Server, and the authtoken for the user.
sap.ui.define([
"sap/ui/core/mvc/Controller",
"sap/ui/model/odata/v2/ODataModel",
"sap/ui/model/json/JSONModel",
"sap/ui/table/Column",
"sap/m/Text",
], function(Controller, ODataModel, JSONModel, Column, Text ) {
"use strict";
return Controller.extend("sap.ui.table.sample.OData2.Controller", {
onInit : function () {
var oView = this.getView();
var oDataModel = new ODataModel("http://myserver/api.rsc/",{user: "MyUser", password: "MyAuthToken"});
oDataModel.getMetaModel().loaded().then(function(){
oView.setModel(oDataModel.getMetaModel(), "meta");
});
oView.setModel(oDataModel);
var oTable = oView.byId("table");
var oBinding = oTable.getBinding("rows");
var oBusyIndicator = oTable.getNoData();
oBinding.attachDataRequested(function(){
oTable.setNoData(oBusyIndicator);
});
oBinding.attachDataReceived(function(){
oTable.setNoData(null); //use default again ("no data" in case no data is available)
});
},
onExit : function () {
},
columnFactory : function(sId, oContext) {
var oModel = this.getView().getModel();
var sName = oContext.getProperty("name");
var sType = oContext.getProperty("type");
var iLen = oContext.getProperty("maxLength");
iLen = iLen ? parseInt(iLen, 10) : 10;
return new Column(sId, {
sortProperty: sName,
filterProperty: sName,
width: (iLen > 9 ? (iLen > 50 ? 15 : 10) : 5) + "rem",
label: new sap.m.Label({text: "{/#Tables/" + sName + "/@name}"}),
hAlign: sType && sType.indexOf("Decimal") >= 0 ? "End" : "Begin",
template: new Text({text: {path: sName}})
});
}
});
});
Describe Application Logic
Create a component that contains the resources of your application. Define the following in Component.js:
sap.ui.define([
'sap/ui/core/UIComponent'
], function(UIComponent) {
"use strict";
return UIComponent.extend("sap.ui.table.sample.OData2.Component", {
metadata : {
rootView : "sap.ui.table.sample.OData2.View",
dependencies : {
libs : [
"sap.ui.table",
"sap.ui.unified",
"sap.m"
]
},
config : {
sample : {
stretch : true,
files : [
"View.view.xml",
"Controller.controller.js"
]
}
}
}
});
});
Bootstrap OpenUI5 and Launch
To complete the MVC application, simply add the bootstrap and initialization code. Add these directly to index.html:
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="x-ua-compatible" content="ie=edge">
<meta charset="utf-8">
<title>Azure Data Catalog Tables</title>
<script id="sap-ui-bootstrap"
src="https://openui5.hana.ondemand.com/resources/sap-ui-core.js"
data-sap-ui-libs="sap.m"
data-sap-ui-theme="sap_bluecrystal"
data-sap-ui-xx-bindingSyntax="complex"
data-sap-ui-preload="async"
data-sap-ui-compatVersion="edge"
data-sap-ui-resourceroots='{"sap.ui.table.sample.OData2": "./", "sap.ui.demo.mock": "mockdata"}'>
</script>
<!-- application launch configuration -->
<script>
sap.ui.getCore().attachInit(function() {
new sap.m.App ({
pages: [
new sap.m.Page({
title: "Azure Data Catalog Tables",
enableScrolling : false,
content: [ new sap.ui.core.ComponentContainer({
height : "100%", name : "sap.ui.table.sample.OData2"
})]
})
]
}).placeAt("content");
});
</script>
</head>
<!-- UI Content -->
<body class="sapUiBody" id="content" role="application">
</body>
</html>
The resulting SAPUI5 table control reflects any changes to a table in the remote Azure Data Catalog data. You can now browse and search current Azure Data Catalog data.
