How to update multiple tables in hibernate?

Question

I am having mySql query and need to transfer it in to hibernate query. I have transferred simple queries into hibernate. But its difficult for me to convert "UPDATE" query. Below is the MySql query,

StringBuilder query = new StringBuilder();
query.append("UPDATE  bus_transport.trip_calendar a ,");
query.append("bus_transport.trip_resource_allocator b,");
query.append("bus_transport.vehicle_calendar c ,");
query.append("bus_transport.driver_calendar d ");

query.append("SET c.vehicle_status_code='Available',");
query.append("a.route_code='" + jsonObjInside.getString("rCode") + "',");
query.append("a.trip_from_date_time='" + finalStartDateTime + "',");
query.append("a.trip_to_date_time='" + finalEndDateTime + "',");
query.append("b.emp_id='" + jsonObjInside.getString("driverId") + "' ,");
query.append("b.vehicle_id='" + jsonObjInside.getString("vehId") + "',");
query.append("c.vehicle_id='" + jsonObjInside.getString("vehId")+ "' ,");
query.append("d.emp_id='" + jsonObjInside.getString("driverId") + "'");

query.append("where a.trip_id='" + jsonObjInside.getString("tripId")+ "'");
query.append(" and b.trip_id='" + jsonObjInside.getString("tripId") + "'");
query.append("and c.trip_id='" + jsonObjInside.getString("tripId")+ "'");
query.append("and d.trip_id='" + jsonObjInside.getString("tripId")+ "' ");

int var = stmt.executeUpdate(query);     

Please help me to convert into Hibernate Update query.

Thanks in advance.

Answer 1

Converting an update statement to HQL would be very similar to converting any SQL statement to HQL. Assuming you have your object mapping set-up correctly already you'd just need to write a correct HQL QUERY. You'll need to use the HQL(HQL Docs) syntax. You replace the table & column names with the object names you have set up.

This:

UPDATE  bus_transport.trip_calendar a , bus_transport.trip_resource_allocator b,
bus_transport.vehicle_calendar c , bus_transport.driver_calendar d "

could be come something like this:

UPDATE  TripCalendar a , TripResourceAllocator b,
VehicleCalendar c , DriverCalendar d "

You reference columns in a similar fashion

This:

SET c.vehicle_status_code='Available'

Could become something like this:

SET c.vehicleStatusCode = 'Available'

For more on the Hiberate DML specific stuff check out this link: HQL DML Docs