Question

I do have a problem query problem with spring and hibernate.

I’ve got a class called Car which maps ManyToMany to my class Inventory. Inventory btw holds no references to the Car class.
This causes spring and hibernate to create the mapping table car_loading with a fk to the car and a fk to the inventory table.

I now want to query the inventory for a special car:

String squery = "SELECT i from Inventory i, car_loading loads WHERE i.id = loads.loading AND car = ?";

But I am getting the exception

org.hibernate.hql.ast.QuerySyntaxException: car_loading is not mapped

FYI: Hibernate doesn’t support the JOIN ON x.a = y.b leading me to do it that way…

Thanks inn advance for any help!

EDIT – My Mapping

public class Car {

    @OneToOne
    private Driver driver;

    @ManyToMany(cascade=CascadeType.ALL)
    private List<Inventory> loading = new ArrayList<Inventory>();   

    @Temporal(TemporalType.TIMESTAMP)
    @DateTimeFormat(pattern="dd:MM:yyy HH:mm")
    private Date lastModified;
    //...
}

public class Inventory {

    private Integer shouldAmount;

    private Integer minAmount;

    private Integer isAmount;

    @Temporal(TemporalType.TIMESTAMP)
    @DateTimeFormat(pattern="dd:MM:yyy HH:mm")
    private Date lastModified;
    //..
}

Answer 1

I saw this question and wanted to updated it. I did it the wrong way around. I could simply query the car and return all inventorys within this car. Because there is a relation from car to inventory, but not the other way around. So query a specific car and simply return the inventory list attribute did it for me…