Native Query throw exception
- dto code
import lombok.Value;
@Value
public class IdsOnly {
Integer id;
String otherId;
}
- repository
public interface TestTableRepository extends JpaRepository<TestTable, Integer> {
@Query(value = "select id, otherId from TestTable where CreationDate > ?1", nativeQuery = true)
public Collection<IdsOnly> findEntriesAfterDate(Date creationDate);
}
- service
List<IdsOnly> results = ttRepo.findEntriesAfterDate(theDate);
- exception
org.springframework.core.convert.ConverterNotFoundException: No converter found capable of converting from type [org.springframework.data.jpa.repository.query.AbstractJpaQuery$TupleConverter$TupleBackedMap] to type [com.example.IdsOnly]
解決方法有兩種
- 使用NativeQuery：將IdsOnly更換成接口，提供屬性的get方法。
public interface IdsOnly {
Integer getId();
String getOtherId();
}
- 不使用NativeQuery
@Query("select new com.example.IdsOnly(t.id, t.otherId) from TestTable t where t.creationDate > ?1")
Jpa中沒有update方法
jpa中只有save方法，如果你傳遞的對象的主鍵在數據庫中存在，那么就是更新操作。否則就是插入操作。
Delete operation
JpaRepository Not supported for DML operations [delete query]
- Repository: add
@Modifying
@Modifying
void deleteByUserIdAndToolId(Integer userId, Integer toolId);
- Service: add
@Transactional
@Transactional
public void doDeleteUserTool(Integer userId, Integer toolId) {
userToolMapper.deleteByUserIdAndToolId(userId, toolId);
}
To be continue
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