如何在Hibernate中的复合主键中自动增加ID? [英] How to autoincrement an Id in a composite primary key in Hibernate?

问题描述

我有一个带有复合主键的表- groupId 和 batchId .实体类如下:

I have a table with a composite primary key - groupId and batchId. Entity class looks like:

@Entity(name="EMPLOYEE")
public class Employee {

    @EmbeddedId
    private EmployeePK employeePK;

    //Other columns and their getters and setters
    //Getters and setters
}

复合PK:

@Embeddable
public class EmployeePK implements Serializable {

    private long groupId;
    private long batchId;

    @GeneratedValue(strategy=GenerationType.AUTO)
    public long getBatchId() {
        return batchId;
    }

    public void setBatchId(long batchId) {
        this.batchId = batchId;
    }
}

我正在尝试自动增加批次ID，以便插入新记录.

I'm trying to auto increment the batch Id, for a new record to be inserted.

//For saving
Employee employee = new Employee();
EmployeePK pk = new IRAmendmentBatchesPK();
pk.setBatchId(0);
pk.setGroupId(4388);

Employee employee = employeeRepository.save(employee);


//Repository Interface
public interface EmployeeRepository extends JpaRepository<Employee, EmployeePK>{

}

我明确地将 batchId 设置为0，希望在保存(插入)期间在batchId中设置自动递增的值.到目前为止，此代码将保存一个新的条目，其batchId为0.

I'm explicity setting batchId as 0, in hopes that the auto-incremented value is set in the batchId during save(insert). As of now, this code will save a new entry with batchId as 0.

推荐答案

@Embeddable
public class EmployeePK implements Serializable {

    private long groupId;
    @GeneratedValue(strategy = GenerationType.AUTO)
    private long batchId;

   
    public long getBatchId() {
        return batchId;
    }

    public void setBatchId(long batchId) {
        this.batchId = batchId;
    }

//implements equals and hashcode

}

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