Defining Service Operations

Data service operations are written to invoke queries. Therefore, defining operations is the 4th step in the process of creating a data service. Follow the steps given below.

1. Log in to the management console and select Create under Data Service menu. Following the instructions given here.
2. Click Next to add a data source. Follow the instructions in Step 2: Adding Datasources.
   
3. Click Next to add a query to the data source. Follow the instructions in Step 3: Writing Data Service Queries.
   
4. Click Next to add an operation to invoke the queries.
   
5. The Add Operation page appears. Provide a name for the operation and select the query to execute when the operation is invoked. For example,
    
   Also, see enable streaming.

<operation name="operation1" returnRequestStatus="true"> 
   <call-query href="QRY_INSERT_DM"> 
       <with-param name="dm1" query-param="dm1"/> 
       <with-param name="dm2" query-param="dm3"/> 
  </call-query>

Handling Faulty Requests

A structured SOAP fault message will be returned for an incorrect invocation of the data service. For example, if you use an invalid value to invoke a data service that validates the length of the parameters, a SOAP fault with VALIDATION_ERROR code will be returned. A SOAP fault message is constructed as given in the following XML schema structure.

<xs:element name="DataServiceFault">
    <xs:complexType>
        <xs:sequence>
        <xs:element name="current_params" type="xs:string"/>
        <xs:element name="current_request_name" type="xs:string"/>
        <xs:element name="nested_exception" type="xs:string"/>
        <xs:element name="source_data_service">
            <xs:complexType>
            <xs:sequence>
                <xs:element name="location" type="xs:string"/>
                <xs:element name="default_namespace" type="xs:string"/>
                <xs:element name="description" type="xs:string"/>
                <xs:element name="data_service_name" type="xs:string"/>
            </xs:sequence>
            </xs:complexType>
        </xs:element>
        <xs:element name="ds_code" type="xs:string"/>
        </xs:sequence>
    </xs:complexType>
</xs:element>