Fixed foriegn key violation issue when getting pending operations

components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/operation/mgt/OperationManagerImpl.java

@@ -456,12 +456,13 @@ public class OperationManagerImpl implements OperationManager {
                         DeviceManagementDAOFactory.closeConnection();
                     }
                     OperationManagementDAOFactory.beginTransaction();
+                    boolean isUpdated = false;
                     if (operation.getStatus() != null) {
-                        operationDAO.updateOperationStatus(enrolmentId, operationId,
+                        isUpdated = operationDAO.updateOperationStatus(enrolmentId, operationId,
                                 org.wso2.carbon.device.mgt.core.dto.operation.mgt.Operation.Status.
                                         valueOf(operation.getStatus().toString()));
                     }
-                    if (operation.getOperationResponse() != null) {
+                    if (isUpdated && operation.getOperationResponse() != null) {
                         operationDAO.addOperationResponse(enrolmentId, operationId, operation.getOperationResponse());
                     }
                     OperationManagementDAOFactory.commitTransaction();

components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/operation/mgt/dao/OperationDAO.java

@@ -54,7 +54,7 @@ public interface OperationDAO {
 
     Operation getNextOperation(int enrolmentId) throws OperationManagementDAOException;
 
-    void updateOperationStatus(int enrolmentId, int operationId,Operation.Status status)
+    boolean updateOperationStatus(int enrolmentId, int operationId,Operation.Status status)
             throws OperationManagementDAOException;
 
     void updateEnrollmentOperationsStatus(int enrolmentId, String operationCode, Operation.Status existingStatus,

components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/operation/mgt/dao/impl/GenericOperationDAOImpl.java

@@ -89,9 +89,10 @@ public class GenericOperationDAOImpl implements OperationDAO {
         }
     }
 
-    public void updateOperationStatus(int enrolmentId, int operationId, Operation.Status status)
+    public boolean updateOperationStatus(int enrolmentId, int operationId, Operation.Status status)
             throws OperationManagementDAOException {
         PreparedStatement stmt = null;
+        boolean isUpdated = false;
         try {
             long time = System.currentTimeMillis() / 1000;
             Connection connection = OperationManagementDAOFactory.getConnection();
@@ -101,14 +102,17 @@ public class GenericOperationDAOImpl implements OperationDAO {
             stmt.setLong(2, time);
             stmt.setInt(3, enrolmentId);
             stmt.setInt(4, operationId);
-            stmt.executeUpdate();
-
+            int numOfRecordsUpdated = stmt.executeUpdate();
+            if (numOfRecordsUpdated != 0) {
+                isUpdated = true;
+            }
         } catch (SQLException e) {
             throw new OperationManagementDAOException("Error occurred while update device mapping operation status " +
                     "metadata", e);
         } finally {
             OperationManagementDAOUtil.cleanupResources(stmt);
         }
+        return isUpdated;
     }
 
     @Override