SqlResultSetMapping 到 POJO class 从 NamedNativeQuery 抛出 'could not locate appropriate constructor'
SqlResultSetMapping to POJO class from a NamedNativeQuery throwing 'could not locate appropriate constructor'
我制作了一个 @NamedNativeQuery 并将其附加到实体 'Doctor'，在同一实体上我附加了一个 @SqlResultSetMapping，它获取查询结果的列并将它们映射到专门制作的 POJO class 的构造函数。此查询还连接到驻留在同一实体的存储库中的 JPA 方法。
但是，我不断收到错误消息，提示找不到合适的构造函数，就好像 @SqlResultSetMapping 或 POJO 构造函数不同步一样。 （堆栈跟踪在底部）
我的实体，@NamedNativeQuery 和 @SqlResultSetMapping：
我直接在数据库上尝试了查询，它给出了预期的结果，所以我只写了 select 子句
@Entity
@NamedNativeQuery(
name =
"Doctor.findFreeExaminationTimes", // name of the JPA method in entity's repository (definition below)
query =
"SELECT on_date AS onDate, LAG(to_time, 1, '00:00') OVER mojWindow AS fromTime, from_time AS toTime " +
"...",
resultSetMapping = "freeTimesByDoctorId" // name of the mapping below
)
@SqlResultSetMapping(
name = "freeTimesByDoctorId", // result set mapping name
classes = @ConstructorResult(
targetClass = DoctorAvailabilityResponse.class, // my POJO class (definition below)
columns = { // order and types are the same as in the select clause above and the POJO constructor below
@ColumnResult(name = "onDate", type = java.sql.Date.class),
@ColumnResult(name = "fromTime", type = java.sql.Time.class),
@ColumnResult(name = "toTime",type = java.sql.Time.class)
}
)
)
public class Doctor extends User {...}
我在 'targetClass' 下的 @ConstructorResult 中提到的 POJO class 有一个构造函数，其参数的顺序、数量和类型在 'columns'[=34 下指定=]
我的 POJO class 应该映射到查询的结果：
public class DoctorAvailabilityResponse {
final private java.sql.Date onDate;
final private java.sql.Time fromTime;
final private java.sql.Time toTime;
public DoctorAvailabilityResponse(java.sql.Date onDate, java.sql.Time fromTime, java.sql.Time toTime) {
this.onDate = onDate;
this.fromTime = fromTime;
this.toTime = toTime;
}
// getters
}
我的存储库：
@RepositoryRestResource
public interface DoctorRepository extends UserRepository<Doctor> {
// JPA method mapped to the named native query above
List<DoctorAvailabilityResponse> findFreeExaminationTimes(@Param("doctorId") Long doctorId);
}
然而，在测试此 JPA 方法时，我收到一条异常消息 'could not locate appropriate constructor'。
我的测试：
@SpringBootTest
public class DoctorTests {
@Autowired
private DoctorRepository doctorRepository;
private final Logger LOGGER = LoggerFactory.getLogger(this.getClass());
@Test
public void shouldReturnDoctorAvailability() {
// Exception thrown here
List<DoctorAvailabilityResponse> freeTimes = doctorRepository.findFreeExaminationTimes(4L);
LOGGER.info(freeTimes.toString());
}
}
我不明白为什么会这样。有没有办法在维护 JPA 存储库方法的同时手动将此结果集映射到 POJO？
堆栈跟踪：
org.springframework.dao.InvalidDataAccessApiUsageException: Could not locate appropriate constructor on class : com.example.isaproj.isa_projekat_2019.Model.DTO.DoctorAvailabilityResponse; nested exception is java.lang.IllegalArgumentException: Could not locate appropriate constructor on class : com.example.isaproj.isa_projekat_2019.Model.DTO.DoctorAvailabilityResponse
at org.springframework.orm.jpa.EntityManagerFactoryUtils.convertJpaAccessExceptionIfPossible(EntityManagerFactoryUtils.java:374)
at org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:256)
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.translateExceptionIfPossible(AbstractEntityManagerFactoryBean.java:528)
...
...
Caused by: java.lang.IllegalArgumentException: Could not locate appropriate constructor on class : com.example.isaproj.isa_projekat_2019.Model.DTO.DoctorAvailabilityResponse
at org.hibernate.loader.custom.ConstructorResultColumnProcessor.resolveConstructor(ConstructorResultColumnProcessor.java:92)
at org.hibernate.loader.custom.ConstructorResultColumnProcessor.performDiscovery(ConstructorResultColumnProcessor.java:45)
at org.hibernate.loader.custom.CustomLoader.autoDiscoverTypes(CustomLoader.java:494)
at org.hibernate.loader.Loader.processResultSet(Loader.java:2333)
at org.hibernate.loader.Loader.getResultSet(Loader.java:2289)
at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:2045)
at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:2007)
at org.hibernate.loader.Loader.doQuery(Loader.java:953)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:354)
at org.hibernate.loader.Loader.doList(Loader.java:2810)
at org.hibernate.loader.Loader.doList(Loader.java:2792)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2624)
at org.hibernate.loader.Loader.list(Loader.java:2619)
at org.hibernate.loader.custom.CustomLoader.list(CustomLoader.java:338)
at org.hibernate.internal.SessionImpl.listCustomQuery(SessionImpl.java:2137)
at org.hibernate.internal.AbstractSharedSessionContract.list(AbstractSharedSessionContract.java:1134)
at org.hibernate.query.internal.NativeQueryImpl.doList(NativeQueryImpl.java:173)
at org.hibernate.query.internal.AbstractProducedQuery.list(AbstractProducedQuery.java:1526)
at org.hibernate.query.Query.getResultList(Query.java:165)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at org.springframework.orm.jpa.SharedEntityManagerCreator$DeferredQueryInvocationHandler.invoke(SharedEntityManagerCreator.java:409)
at com.sun.proxy.$Proxy212.getResultList(Unknown Source)
at org.springframework.data.jpa.repository.query.JpaQueryExecution$CollectionExecution.doExecute(JpaQueryExecution.java:126)
at org.springframework.data.jpa.repository.query.JpaQueryExecution.execute(JpaQueryExecution.java:88)
at org.springframework.data.jpa.repository.query.AbstractJpaQuery.doExecute(AbstractJpaQuery.java:154)
at org.springframework.data.jpa.repository.query.AbstractJpaQuery.execute(AbstractJpaQuery.java:142)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:618)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:605)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:353)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:99)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:139)
... 73 more
完整性检查和替代方法
为了进行完整性检查，我删除了 @SqlResultSetMapping，在这种情况下，查询应该是 return 'Object[]' 值的列表，然后我测试了每个单独的值那个数组来检查它的类型，它告诉我类型是我假设它们是 'java.sql.Date' 和 'java.sql.Time' 两次，并且它们三个都按预期顺序排列，（日期，时间，时间), 这与我的 POJO class.
的构造函数参数的顺序相匹配
我的实体和 namedNativeQuery：
@Entity
@NamedNativeQuery(
name =
"Doctor.findFreeExaminationTimes",
query =
"SELECT on_date AS onDate, LAG(to_time, 1, '00:00') OVER mojWindow AS fromTime, from_time AS toTime " +
"..."
)
public class Doctor extends User {...}
我的存储库有一个新的 return 类型：
@RepositoryRestResource
public interface DoctorRepository extends UserRepository<Doctor> {
List<Object[]> findFreeExaminationTimes(@Param("doctorId") Long doctorId);
}
我的测试：
@SpringBootTest
public class DoctorTests {
@Autowired
private DoctorRepository doctorRepository;
private final Logger LOGGER = LoggerFactory.getLogger(this.getClass());
@Test
public void shouldReturnDoctorAvailability() {
// Exception thrown here
List<DoctorAvailabilityResponse> freeTimes = doctorRepository.findFreeExaminationTimes(4L);
freeTimes.stream().forEach((ft) -> {
// Values are in expected order and of expected types
String classNameOnDate = ft[0].getClass().toString(); // java.sql.Date
String classNameFromTime = ft[1].getClass().toString(); // java.sql.Time
String classNameToTime = ft[1].getClass().toString(); // java.sql.Time
// I suppose the mapping mechanism is supposed to do something like this, but fails for some reason
DoctorAvailabilityResponse dar = new DoctorAvailabilityResponse((Date)ft[0], (Time)ft[1], (Time)ft[2]);
});
LOGGER.info(freeTimes.toString());
}
}
运行 这个测试工作完美，据推测表明问题出在@SqlResultSetMapping 或 POJO class.
如果有任何反馈，我将不胜感激。谢谢！
解决方案
我不得不更改 @SqlResultSetMapping 和我的 POJO class 的构造函数中的类型。
已更改 @SqlResultSetMapping
@SqlResultSetMapping(
name = "freeTimesByDoctorId",
classes = @ConstructorResult(
targetClass = DoctorAvailabilityResponse.class,
columns = {
@ColumnResult(name = "onDate", type = String.class),
@ColumnResult(name = "fromTime", type = String.class),
@ColumnResult(name = "toTime",type = String.class)
}
)
)
更改了 POJO class 构造函数
public DoctorAvailabilityResponse(String onDate, String fromTime, String toTime) {
this.onDate = Date.valueOf(onDate);
this.fromTime = Time.valueOf(fromTime);
this.toTime = Time.valueOf(toTime);
}
仅此一项并没有解决我的问题，因为我遇到了上述的休眠异常并解决了 。根据这个答案，我还更改了我的存储库并添加了一个额外的注释。
已更改存储库
@RepositoryRestResource
public interface DoctorRepository extends UserRepository<Doctor> {
@Query(nativeQuery = true) // This is added
List<DoctorAvailabilityResponse> findFreeExaminationTimes(@Param("doctorId") Long doctorId);
}
现在一切正常，但问题仍然是为什么 @SqlResultSetMapping 首先不将 java.sql.* 类型映射到构造函数。
@ConstructorResult 不能很好地与 java.sql.Date.class 或 java.sql.Time.class 类型一起使用。解决问题的一种方法是改用 String.class，然后在 DoctorAvailabilityResponse 的构造函数
中将字符串值转换为 Date/Time
我制作了一个 @NamedNativeQuery 并将其附加到实体 'Doctor'，在同一实体上我附加了一个 @SqlResultSetMapping，它获取查询结果的列并将它们映射到专门制作的 POJO class 的构造函数。此查询还连接到驻留在同一实体的存储库中的 JPA 方法。
但是，我不断收到错误消息，提示找不到合适的构造函数，就好像 @SqlResultSetMapping 或 POJO 构造函数不同步一样。 （堆栈跟踪在底部）
我的实体，@NamedNativeQuery 和 @SqlResultSetMapping：
我直接在数据库上尝试了查询，它给出了预期的结果，所以我只写了 select 子句
@Entity
@NamedNativeQuery(
name =
"Doctor.findFreeExaminationTimes", // name of the JPA method in entity's repository (definition below)
query =
"SELECT on_date AS onDate, LAG(to_time, 1, '00:00') OVER mojWindow AS fromTime, from_time AS toTime " +
"...",
resultSetMapping = "freeTimesByDoctorId" // name of the mapping below
)
@SqlResultSetMapping(
name = "freeTimesByDoctorId", // result set mapping name
classes = @ConstructorResult(
targetClass = DoctorAvailabilityResponse.class, // my POJO class (definition below)
columns = { // order and types are the same as in the select clause above and the POJO constructor below
@ColumnResult(name = "onDate", type = java.sql.Date.class),
@ColumnResult(name = "fromTime", type = java.sql.Time.class),
@ColumnResult(name = "toTime",type = java.sql.Time.class)
}
)
)
public class Doctor extends User {...}
我在 'targetClass' 下的 @ConstructorResult 中提到的 POJO class 有一个构造函数，其参数的顺序、数量和类型在 'columns'[=34 下指定=]
我的 POJO class 应该映射到查询的结果：
public class DoctorAvailabilityResponse {
final private java.sql.Date onDate;
final private java.sql.Time fromTime;
final private java.sql.Time toTime;
public DoctorAvailabilityResponse(java.sql.Date onDate, java.sql.Time fromTime, java.sql.Time toTime) {
this.onDate = onDate;
this.fromTime = fromTime;
this.toTime = toTime;
}
// getters
}
我的存储库：
@RepositoryRestResource
public interface DoctorRepository extends UserRepository<Doctor> {
// JPA method mapped to the named native query above
List<DoctorAvailabilityResponse> findFreeExaminationTimes(@Param("doctorId") Long doctorId);
}
然而，在测试此 JPA 方法时，我收到一条异常消息 'could not locate appropriate constructor'。
我的测试：
@SpringBootTest
public class DoctorTests {
@Autowired
private DoctorRepository doctorRepository;
private final Logger LOGGER = LoggerFactory.getLogger(this.getClass());
@Test
public void shouldReturnDoctorAvailability() {
// Exception thrown here
List<DoctorAvailabilityResponse> freeTimes = doctorRepository.findFreeExaminationTimes(4L);
LOGGER.info(freeTimes.toString());
}
}
我不明白为什么会这样。有没有办法在维护 JPA 存储库方法的同时手动将此结果集映射到 POJO？
堆栈跟踪：
org.springframework.dao.InvalidDataAccessApiUsageException: Could not locate appropriate constructor on class : com.example.isaproj.isa_projekat_2019.Model.DTO.DoctorAvailabilityResponse; nested exception is java.lang.IllegalArgumentException: Could not locate appropriate constructor on class : com.example.isaproj.isa_projekat_2019.Model.DTO.DoctorAvailabilityResponse
at org.springframework.orm.jpa.EntityManagerFactoryUtils.convertJpaAccessExceptionIfPossible(EntityManagerFactoryUtils.java:374)
at org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:256)
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.translateExceptionIfPossible(AbstractEntityManagerFactoryBean.java:528)
...
...
Caused by: java.lang.IllegalArgumentException: Could not locate appropriate constructor on class : com.example.isaproj.isa_projekat_2019.Model.DTO.DoctorAvailabilityResponse
at org.hibernate.loader.custom.ConstructorResultColumnProcessor.resolveConstructor(ConstructorResultColumnProcessor.java:92)
at org.hibernate.loader.custom.ConstructorResultColumnProcessor.performDiscovery(ConstructorResultColumnProcessor.java:45)
at org.hibernate.loader.custom.CustomLoader.autoDiscoverTypes(CustomLoader.java:494)
at org.hibernate.loader.Loader.processResultSet(Loader.java:2333)
at org.hibernate.loader.Loader.getResultSet(Loader.java:2289)
at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:2045)
at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:2007)
at org.hibernate.loader.Loader.doQuery(Loader.java:953)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:354)
at org.hibernate.loader.Loader.doList(Loader.java:2810)
at org.hibernate.loader.Loader.doList(Loader.java:2792)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2624)
at org.hibernate.loader.Loader.list(Loader.java:2619)
at org.hibernate.loader.custom.CustomLoader.list(CustomLoader.java:338)
at org.hibernate.internal.SessionImpl.listCustomQuery(SessionImpl.java:2137)
at org.hibernate.internal.AbstractSharedSessionContract.list(AbstractSharedSessionContract.java:1134)
at org.hibernate.query.internal.NativeQueryImpl.doList(NativeQueryImpl.java:173)
at org.hibernate.query.internal.AbstractProducedQuery.list(AbstractProducedQuery.java:1526)
at org.hibernate.query.Query.getResultList(Query.java:165)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at org.springframework.orm.jpa.SharedEntityManagerCreator$DeferredQueryInvocationHandler.invoke(SharedEntityManagerCreator.java:409)
at com.sun.proxy.$Proxy212.getResultList(Unknown Source)
at org.springframework.data.jpa.repository.query.JpaQueryExecution$CollectionExecution.doExecute(JpaQueryExecution.java:126)
at org.springframework.data.jpa.repository.query.JpaQueryExecution.execute(JpaQueryExecution.java:88)
at org.springframework.data.jpa.repository.query.AbstractJpaQuery.doExecute(AbstractJpaQuery.java:154)
at org.springframework.data.jpa.repository.query.AbstractJpaQuery.execute(AbstractJpaQuery.java:142)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:618)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:605)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:353)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:99)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:139)
... 73 more
完整性检查和替代方法
为了进行完整性检查，我删除了 @SqlResultSetMapping，在这种情况下，查询应该是 return 'Object[]' 值的列表，然后我测试了每个单独的值那个数组来检查它的类型，它告诉我类型是我假设它们是 'java.sql.Date' 和 'java.sql.Time' 两次，并且它们三个都按预期顺序排列，（日期，时间，时间), 这与我的 POJO class.
我的实体和 namedNativeQuery：
@Entity
@NamedNativeQuery(
name =
"Doctor.findFreeExaminationTimes",
query =
"SELECT on_date AS onDate, LAG(to_time, 1, '00:00') OVER mojWindow AS fromTime, from_time AS toTime " +
"..."
)
public class Doctor extends User {...}
我的存储库有一个新的 return 类型：
@RepositoryRestResource
public interface DoctorRepository extends UserRepository<Doctor> {
List<Object[]> findFreeExaminationTimes(@Param("doctorId") Long doctorId);
}
我的测试：
@SpringBootTest
public class DoctorTests {
@Autowired
private DoctorRepository doctorRepository;
private final Logger LOGGER = LoggerFactory.getLogger(this.getClass());
@Test
public void shouldReturnDoctorAvailability() {
// Exception thrown here
List<DoctorAvailabilityResponse> freeTimes = doctorRepository.findFreeExaminationTimes(4L);
freeTimes.stream().forEach((ft) -> {
// Values are in expected order and of expected types
String classNameOnDate = ft[0].getClass().toString(); // java.sql.Date
String classNameFromTime = ft[1].getClass().toString(); // java.sql.Time
String classNameToTime = ft[1].getClass().toString(); // java.sql.Time
// I suppose the mapping mechanism is supposed to do something like this, but fails for some reason
DoctorAvailabilityResponse dar = new DoctorAvailabilityResponse((Date)ft[0], (Time)ft[1], (Time)ft[2]);
});
LOGGER.info(freeTimes.toString());
}
}
运行 这个测试工作完美，据推测表明问题出在@SqlResultSetMapping 或 POJO class.
如果有任何反馈，我将不胜感激。谢谢！
解决方案
我不得不更改 @SqlResultSetMapping 和我的 POJO class 的构造函数中的类型。
已更改 @SqlResultSetMapping
@SqlResultSetMapping(
name = "freeTimesByDoctorId",
classes = @ConstructorResult(
targetClass = DoctorAvailabilityResponse.class,
columns = {
@ColumnResult(name = "onDate", type = String.class),
@ColumnResult(name = "fromTime", type = String.class),
@ColumnResult(name = "toTime",type = String.class)
}
)
)
更改了 POJO class 构造函数
public DoctorAvailabilityResponse(String onDate, String fromTime, String toTime) {
this.onDate = Date.valueOf(onDate);
this.fromTime = Time.valueOf(fromTime);
this.toTime = Time.valueOf(toTime);
}
仅此一项并没有解决我的问题，因为我遇到了上述的休眠异常并解决了
已更改存储库
@RepositoryRestResource
public interface DoctorRepository extends UserRepository<Doctor> {
@Query(nativeQuery = true) // This is added
List<DoctorAvailabilityResponse> findFreeExaminationTimes(@Param("doctorId") Long doctorId);
}
现在一切正常，但问题仍然是为什么 @SqlResultSetMapping 首先不将 java.sql.* 类型映射到构造函数。
@ConstructorResult 不能很好地与 java.sql.Date.class 或 java.sql.Time.class 类型一起使用。解决问题的一种方法是改用 String.class，然后在 DoctorAvailabilityResponse 的构造函数