Java：接口org.springframework.data.jpa.repository.JpaRepository中的方法saveAllAndFlush<t,id> 不能应用于给定类型</t,id>

Question

我的实体

public class CarModelEntity {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "model_id")
    private Integer modelId;
    @Column(name = "model_name")
    private String modelName;
    @Column(name = "is_parent")
    private Integer isParent;
    @Column(name = "parent_id")
    private Integer parentId;
    @Column(name = "created_by")
    private Integer createdBy;
    @Column(name = "created_at")
    private Timestamp createdAt;
    @Column(name = "updated_at")
    private Timestamp updatedAt;

}

我的代码：

CarModelEntity data = carModelRepo
                        .saveAllAndFlush(CarModelEntity.builder()
                                .isParent(1)
                                .modelName(value)
                                .build());

语法错误：

Error:(49, 25) java: method saveAllAndFlush in interface org.springframework.data.jpa.repository.JpaRepository<T,ID> cannot be applied to given types;
  required: java.lang.Iterable<S>
  found: com.*****.catprices.mobileapp.model.entity.CarModelEntity
  reason: cannot infer type-variable(s) S
    (argument mismatch; com.****.catprices.mobileapp.model.entity.CarModelEntity cannot be converted to java.lang.Iterable<S>)

我的存储库：

public interface CarModelRepo extends JpaRepository<CarModelEntity, Integer> {
}

Answer 1

转发它作为答案

saveAllAndFlush accept Iterable object while you give simple Object, you can add your CalModelEntity to an Object that implement Iterable such as ArrayList, HashMap or etc, and then pass the Object to saveAllAndFlush method. 并且 saveAllAndFlush 返回列表 Object 所以你需要一个列表来接收方法的返回值。

这是一些示例代码

List<CarModelEntity> paramCarModelEntityList = new ArrayList<CarModelEntity>();
        paramCarModelEntityList.add(CarModelEntity.builder()
                .isParent(1)
                .modelName(value)
                .build());
List<CarModelEntity> carModelEntityList = repository.saveAllAndFlush(paramCarModelEntityList);

以下是一些参考链接：

可迭代的JpaRepository