Set where clause on field

问题

I have a base entity that holds a enum field called State.

public enum State {

    DELETED(0),
    ACTIVE(1)
    ;

    private int value;

    private State(int value) {
        this.value = value;
    }

    public int getValue() {
        return this.value;
    }

}

Is there a JPA annotated way to set the where clauses of the generated queries to retrieve only entities that the state field is "ACTIVE"?
The reason is that if i have an entity "A" that holds a list of entities "B", when i retrieve from the DB an instance of "A" and initialize it, i want the list of "B" to hold only the entities where the State filed is "ACTIVE"

回答1:

There is no filter or where annotations in JPA and there is no way to filter collection entities using annotations.

I suggest you retrieving A entities and fetching only active B entities.

回答2:

Use @Filter as

 @Filter(name, condition)

or @Where as

 @where(state = STATE.ACTIVE.getValue())

回答3:

There is no standard way to do this in JPA.

One method might be to create a view that filters the table and map to the view instead of the table.

If you are using EclipseLink you can use @AdditionalCriteria

http://www.eclipse.org/eclipselink/documentation/2.4/jpa/extensions/a_additionalcriteria.htm#additionalcriteria

回答4:

I suggest you do this with database views. Access the underlying table containing all entities including the soft deleted entities and access a view for the non-deleted entities

来源：https://stackoverflow.com/questions/12921136/set-where-clause-on-field

标签

jpa

annotations

where-clause