Question

我正在使用IBM MobileFirst + Ionic + AngularJS来创建一个按名称搜索客户并将结果列在表格中的程序。

我们说我有一个适配器：

<wl:adapter name="customerAdapter"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xmlns:wl="http://www.ibm.com/mfp/integration"
xmlns:sql="http://www.ibm.com/mfp/integration/sql">
<displayName>customerAdapter</displayName>
<description>customerAdapter</description>
<connectivity>
  <connectionPolicy xsi:type="sql:SQLConnectionPolicy">
     <dataSourceDefinition>
        <driverClass>oracle.jdbc.driver.OracleDriver</driverClass>
            <url>jdbc:oracle:thin:@//10.128.2.155:1521/MyDB</url> 
            <user>admin</user>
            <password>admin</password>
        </dataSourceDefinition>
    </connectionPolicy>
</connectivity>
<procedure name="searchCustomerByIC"/>
<procedure name="searchCustomerByNM"/>
<procedure name="searchCustomerByICandNM"/>

这是实现:(对于searchCustomerByNM）

var statementSearchCustomerByNM= WL.Server.createSQLStatement("select CUST_NM,CUST_NIRC,CUST_GENDER from TB_CUSTOMER where CUST_NM like UPPER(?) ");
function searchCustomerByNM(customerName) {
    return WL.Server.invokeSQLStatement({
       preparedStatement : statementSearchCustomerByNM,
       parameters : [new String("%" + customerName + "%")]
  });
}

适配器运行良好。

这是我的GUI代码：

<ion-view view-title="Customer">
 <ion-content>
 <div id = "pageCustomer">
    <div class="list">
      <label class="item item-input">
        <input type="text" placeholder="Customer Name" ng model="customerName">
      </label>
      <label class="item item-input">
        <input type="text" placeholder="Customer IC" ng-model="customerIc">
      </label>
      <button class="button button-full button-positive" ng-click="customerSearch(customerName)">
        Search Customer
    </button>
    </div>
    <hr>
    <table id="myTable" cellpadding="5" align="center" >
    <thead>
    <tr>
        <th data-priority="2">Name</th>
        <th data-priority="1">NIRC</th>
        <th data-priority="persist">Gender</th>
        <td></td>
    </tr>
    </thead>

      <tr ng-repeat="x in customers">
        <td>{{ x.name }}</td>
        <td>{{ x.ic}}</td>
        <td>{{ x.gender }}</td>
      </tr>
    </table>    
  </div>
</ion-content>
</ion-view>

这是我的服务：

app.service("customerSearchService",function()
{
    this.searchByName = function(name){

            var invokeData = {
                 adapter:"customerAdapter",
                 procedure:["searchCustomerByNM"],
                 parameters:[name]
             };

            var options = {
                 onSuccess:loadSQLQuerySuccess,
                 onFailure:loadSQLQueryFailure,
                 invocationContext:{'action':'Search Customer'}
             };

            WL.Client.invokeProcedure(invokeData,options);
            function loadSQLQuerySuccess(result){
                var customers = new Array();
               var SJ = JSON.parse(JSON.stringify(result));
               var length = SJ.invocationResult.resultSet.length;
               for(var i=0;i<length;i++)
               { 
                    customers[i] = {name:SJ.invocationResult.resultSet[i].CUST_NM , ic:SJ.invocationResult.resultSet[i].CUST_NIRC , gender:SJ.invocationResult.resultSet[i].CUST_GENDER};
               }
               return customers;     
            }
           function loadSQLQueryFailure(){
               console.log("failureSend");
               alert("failureSend");
               var customers = new Array();
               return customers; 
           }
    }
});

这是我的控制者：

app.controller('CustomerCtrl', function($scope,   customerSearchService,busyIndicator) {
$scope.getCustomers = function(customerName)
{
    $scope.customers = [];
    busyIndicator.show();
    $scope.customers = customerSearchService.searchByName(customerName);
    alert($scope.customers);
    busyIndicator.hide();
};
$scope.customerSearch=function(customerName){   
    $scope.getCustomers(customerName);
}

})

我应该如何编写服务和控制器？（请在我的情况下提供代码）我之前尝试过，但我的函数保持返回空结果，因为在适配器获取所有数据之前返回结果。如何等待适配器获取所有数据？

提前致谢。

Answer 1

主要问题是您的searchByName不会返回任何内容。仔细观察，您会发现唯一的return语句在其他函数中。因此，您的函数调用将结束而不返回任何内容。就像你说的那样，它甚至会在调用完成之前返回。

您遇到的是asynchronous服务的典型流程。

我知道解决这个问题的两种方法：

承诺：承诺允许您以某种方式“等待”答案，就像您问的那样。

了解一般的承诺：http://www.html5rocks.com/en/tutorials/es6/promises/

了解AngularJS中的承诺：https://docs.angularjs.org/api/ng/service/ $ q

阅读服务中的承诺：http://chariotsolutions.com/blog/post/angularjs-corner-using-promises-q-handle-asynchronous-calls/

AngularJS广播广播允许您从一个地方（您的服务）发送消息并在另一个地方（您的控制器）接收消息。因此，您可以在完成后ping您的控制器：$on and $broadcast in angular

Answer 2

您可以尝试在服务中使用$ q（https://docs.angularjs.org/api/ng/service/ $ q）

app.service("customerSearchService",function($q) // Add $q 
{
    this.searchByName = function(name){
        var deferred = $q.defer();
        var invokeData = {
             adapter:"customerAdapter",
             procedure:"searchCustomerByNM", // Note this is not an array
             parameters:[name]
         };

        var options = {
             onSuccess:loadSQLQuerySuccess,
             onFailure:loadSQLQueryFailure,
             invocationContext:{'action':'Search Customer'}
         };

        WL.Client.invokeProcedure(invokeData,options);
        function loadSQLQuerySuccess(result){
            var customers = new Array();
           var SJ = JSON.parse(JSON.stringify(result));
           var length = SJ.invocationResult.resultSet.length;
           for(var i=0;i<length;i++)
           { 
                customers[i] = {name:SJ.invocationResult.resultSet[i].CUST_NM , ic:SJ.invocationResult.resultSet[i].CUST_NIRC , gender:SJ.invocationResult.resultSet[i].CUST_GENDER};
           }
           //return customers;     
           deferred.resolve(customers);
        }
       function loadSQLQueryFailure(){
           console.log("failureSend");
           alert("failureSend");
           var customers = new Array();
           //return customers; 
           deferred.reject(customers);
       }

       return deferred.promise;
    }
});

Answer 3

我可能也建议您阅读并关注Raymond Camden的博客。他在MFP和Ionic上发了几篇帖子，包括适配器使用。

usage documentation

IBM MobileFirst Adapter如何与Angular JS集成？

3 个答案: