如何将两个OR语句与QueryDSL结合？

Question

如何在QueryDSL A OR (B AND C)进行以下声明？

Answer 1

Let's say you have a Person Entity as follows

@Entity
public class Person {
    @Id
    @GeneratedValue(strategy = AUTO)
    private Long id;
    private String username;
    private Integer age;

    // Getter, Setter, Constructors as required

}

You have a query object like below

QPerson personA = new QPerson("a");
QPerson personB = new QPerson("b");
QPerson personC = new QPerson("c");

Assuming all are Person class query object

You can create a Predicate like below

BooleanExpression A = personA.username.eq("X");
BooleanExpression B = personB.username.eq("Y");
BooleanExpression C = personC.username.eq("Z");

Then you can combine the BooleanExpression (Predicate) like below

A.or(B.and(C))