我有一个 Team 实体，我想将一个额外的 String 列映射到结果集。为此，我使用了 @SqlResultSetMapping 并创建了一个名为 TeamListInformation 的新类。
我的团队实体:
@Entity
@Table(name="teams")
@SqlResultSetMapping(
name = "TeamInformation",
entities={
@EntityResult(
entityClass=Team.class,
fields={
@FieldResult(name="id", column="id"),
@FieldResult(name="name", column="name"),
@FieldResult(name="rating", column="rating"),
@FieldResult(name="id_country", column="id_country"),
@FieldResult(name="id_division", column="id_division")
}
)
},
columns={
@ColumnResult(name="country"),
@ColumnResult(name="division"),
@ColumnResult(name="games")
}
)
public class Team implements Serializable{
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Integer id;
@Column(name = "name", length = 40, nullable = false)
private String name;
@Column(name = "rating", length = 6, nullable = false)
private Integer rating;
@ManyToOne(fetch = FetchType.EAGER)
@JoinColumn(name = "id_country", nullable = false)
private Country country;
@ManyToOne(fetch = FetchType.EAGER)
@JoinColumn(name = "id_division", nullable = false)
private Division division;
@Column(name = "desc_image", length = 100, nullable = true)
private String descImage;
@OneToMany(fetch = FetchType.EAGER, mappedBy = "team")
private List<ActividadeEquipa> actividadesEquipa;
我的 TeamListInformation 类:
public class TeamListInformation {
private Integer id;
private String name;
private Integer rating;
private String id_country;
private String country;
private String id_division;
private String division;
private String games;
getters and setters...
}
然后，在我的 DAO 类中，我创建了一个函数来生成我的查询:
public List<TeamListInformation> getTeams(){
Query q = em.createNativeQuery(
"SELECT " +
"T.id as id, " +
"T.name as name, " +
"T.rating as rating, " +
"T.id_country as id_country, " +
"C.name as country, " +
"D.id_division as id_division, " +
"D.name as division, " +
"group_concat(J.nome SEPARATOR ', ') as games " +
"FROM teams T " +
"INNER JOIN countries C " +
"ON T.id_country = C.id_country " +
"INNER JOIN divisions D " +
"ON T.id_division = D.id_division " +
"INNER JOIN actividade_equipa AE " +
"ON T.id = AE.id_equipa " +
"INNER JOIN jogo J " +
"ON AE.id_jogo = J.id " +
"GROUP BY T.id, T.name, T.rating, T.id_country, C.name, D.id_division, D.name",
"TeamInformation");
List<TeamListInformation> teams = q.getResultList();
return teams;
}
生成的查询:
SELECT
T.id as id,
T.name as name,
T.rating as rating,
T.id_country as id_country,
C.name as country,
D.id_division as id_division,
D.name as division,
group_concat(J.nome SEPARATOR ', ') as games
FROM
teams T
INNER JOIN
countries C
ON T.id_country = C.id_country
INNER JOIN
divisions D
ON T.id_division = D.id_division
INNER JOIN
actividade_equipa AE
ON T.id = AE.id_equipa
INNER JOIN
jogo J
ON AE.id_jogo = J.id
GROUP BY
T.id,
T.name,
T.rating,
T.id_country,
C.name,
D.id_division,
D.name
生成的查询是正确的，当我在 MySQL Workbench 中直接执行它时，它返回了理想的结果，但是，我收到以下异常:java.sql.SQLException: Column 'id_count5_5_0_' not found。
我错过了什么？
错误:
HTTP Status 500 - Request processing failed; nested exception is javax.persistence.PersistenceException: org.hibernate.exception.SQLGrammarException: could not execute query
type Exception report
message Request processing failed; nested exception is javax.persistence.PersistenceException: org.hibernate.exception.SQLGrammarException: could not execute query
description The server encountered an internal error that prevented it from fulfilling this request.
exception
java.sql.SQLException: Column 'id_count5_5_0_' not found.
com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:545)
com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:513)
com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:505)
com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:479)
com.mysql.cj.jdbc.result.ResultSetImpl.findColumn(ResultSetImpl.java:574)
com.mysql.cj.jdbc.result.ResultSetImpl.getString(ResultSetImpl.java:892)
org.hibernate.type.descriptor.sql.VarcharTypeDescriptor$2.doExtract(VarcharTypeDescriptor.java:62)
org.hibernate.type.descriptor.sql.BasicExtractor.extract(BasicExtractor.java:47)
org.hibernate.type.AbstractStandardBasicType.nullSafeGet(AbstractStandardBasicType.java:260)
org.hibernate.type.AbstractStandardBasicType.nullSafeGet(AbstractStandardBasicType.java:256)
org.hibernate.type.AbstractStandardBasicType.nullSafeGet(AbstractStandardBasicType.java:246)
org.hibernate.type.ManyToOneType.hydrate(ManyToOneType.java:179)
org.hibernate.persister.entity.AbstractEntityPersister.hydrate(AbstractEntityPersister.java:2844)
org.hibernate.loader.Loader.loadFromResultSet(Loader.java:1741)
org.hibernate.loader.Loader.instanceNotYetLoaded(Loader.java:1667)
org.hibernate.loader.Loader.getRow(Loader.java:1556)
org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:740)
org.hibernate.loader.Loader.processResultSet(Loader.java:985)
org.hibernate.loader.Loader.doQuery(Loader.java:943)
org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:349)
org.hibernate.loader.Loader.doList(Loader.java:2615)
org.hibernate.loader.Loader.doList(Loader.java:2598)
org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2430)
org.hibernate.loader.Loader.list(Loader.java:2425)
org.hibernate.loader.custom.CustomLoader.list(CustomLoader.java:335)
org.hibernate.internal.SessionImpl.listCustomQuery(SessionImpl.java:2160)
org.hibernate.internal.AbstractSharedSessionContract.list(AbstractSharedSessionContract.java:992)
org.hibernate.query.internal.NativeQueryImpl.doList(NativeQueryImpl.java:148)
org.hibernate.query.internal.AbstractProducedQuery.list(AbstractProducedQuery.java:1414)
org.hibernate.query.Query.getResultList(Query.java:146)
org.o7planning.SpringMVCTeams.dao.imp.TeamDAOImpl.getTeamsTest(TeamDAOImpl.java:195)
org.o7planning.SpringMVCTeams.service.imp.TeamServiceImpl.getNumOfPages(TeamServiceImpl.java:50)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
java.lang.reflect.Method.invoke(Unknown Source)
org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:333)
org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99)
org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:282)
org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213)
com.sun.proxy.$Proxy72.getNumOfPages(Unknown Source)
org.o7planning.SpringMVCTeams.controller.TeamController.getlistOfTeams(TeamController.java:154)
org.o7planning.SpringMVCTeams.controller.TeamController.listOfTeams(TeamController.java:179)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
java.lang.reflect.Method.invoke(Unknown Source)
org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205)
org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:133)
org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:116)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:826)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:737)
org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:964)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:856)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:841)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:317)
org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:127)
org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:91)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:114)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:137)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:170)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:200)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:116)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:64)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:56)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:214)
org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:177)
org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262)
最佳答案
我设法通过更改 @SqlResultSetMapping 来做到这一点:
@SqlResultSetMapping(
name = "TeamInformation",
classes = {
@ConstructorResult(targetClass = TeamListInformation.class,
columns = {@ColumnResult(name="id", type = Integer.class) ,
@ColumnResult(name="name", type = String.class),
@ColumnResult(name="rating", type = Integer.class),
@ColumnResult(name="country", type = String.class),
@ColumnResult(name="division", type = String.class),
@ColumnResult(name="games", type = String.class)}
)}
)
尽管如此，我仍然不知道我之前的实现有什么问题。
关于java - Spring Hibernate - 查询以将附加列映射到我的实体 - java.sq.SQLException : Column not found，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/45220118/