title: SQLSyntaxErrorException: Expected key 'KEY' to be present in WHERE clause for 'dept'
body: <p>I am running the insert example from WSO2 DSS to Cassandra Database.</p>
  
  <p>Here is my DSS with Casandra Database insert Configuration.</p>
  
  <pre><code>&lt;data name="Cdno"&gt;
     &lt;config id="insert"&gt;
        &lt;property name="url"&gt;jdbc:cassandra://localhost:9160/employee&lt;/property&gt;
        &lt;property name="driverClassName"&gt;org.apache.cassandra.cql.jdbc.CassandraDriver&lt;/property&gt;
     &lt;/config&gt;
     &lt;query id="Insertinto" useConfig="insert"&gt;
        &lt;sql&gt;INSERT INTO employee.dept(eno,dno) values(?,?)&lt;/sql&gt;
        &lt;result element="Body" rowName="Datalist"&gt;
           &lt;element column="eno" name="eno" xsdType="integer"/&gt;
           &lt;element column="dno" name="dno" xsdType="integer"/&gt;
        &lt;/result&gt;
        &lt;param name="eno" ordinal="1" sqlType="INTEGER"/&gt;
        &lt;param name="dno" ordinal="2" sqlType="INTEGER"/&gt;
     &lt;/query&gt;
     &lt;operation name="insertinto"&gt;
        &lt;call-query href="Insertinto"&gt;
           &lt;with-param name="eno" query-param="eno"/&gt;
           &lt;with-param name="dno" query-param="dno"/&gt;
        &lt;/call-query&gt;
     &lt;/operation&gt;
  &lt;/data&gt;
  </code></pre>
  
  <p>While i am inserting data from DSS try this service to Cassandra
   Database , i am getting the following error. How can i achieve this .</p>
  
  <pre><code>DS Code: DATABASE_ERROR
  Source Data Service:-
  Name: Cdno
  Location: /Cdno.dbs
  Description: N/A
  Default Namespace: http://ws.wso2.org/dataservice
  Current Request Name: insertinto
  Current Params: {eno=5, dno=6}
  Nested Exception:-
  java.sql.SQLSyntaxErrorException: Expected key 'KEY' to be present in WHERE clause for 'dept'
  
      at org.wso2.carbon.dataservices.core.engine.DSOMDataSource.execute(DSOMDataSource.java:105)
      at org.wso2.carbon.dataservices.core.engine.DSOMDataSource.serialize(DSOMDataSource.java:110)
      at org.apache.axiom.om.impl.llom.OMSourcedElementImpl.internalSerialize(OMSourcedElementImpl.java:691)
      at org.apache.axiom.om.impl.util.OMSerializerUtil.serializeChildren(OMSerializerUtil.java:562)
      at org.apache.axiom.om.impl.llom.OMElementImpl.internalSerialize(OMElementImpl.java:875)
      at org.apache.axiom.soap.impl.llom.SOAPEnvelopeImpl.serializeInternally(SOAPEnvelopeImpl.java:283)
      at org.apache.axiom.soap.impl.llom.SOAPEnvelopeImpl.internalSerialize(SOAPEnvelopeImpl.java:245)
      at org.apache.axiom.om.impl.llom.OMSerializableImpl.serializeAndConsume(OMSerializableImpl.java:193)
      at org.apache.axis2.transport.http.SOAPMessageFormatter.writeTo(SOAPMessageFormatter.java:74)
      ... 38 more
  </code></pre>