那些遇到过的问题

JPA 本机查询结果集映射不起作用？

Ven*_* CH 3 java jpa

我正在尝试将本机查询结果映射到 POJO 类并面临以下错误：

org.springframework.orm.jpa.JpaSystemException: Unknown entity: com.cvrr.btq.model.LossDetails; nested exception is org.hibernate.MappingException: Unknown entity: com.cvrr.btq.model.LossDetails
    at org.springframework.orm.jpa.vendor.HibernateJpaDialect.convertHibernateAccessException(HibernateJpaDialect.java:303) ~[spring-orm-4.1.1.RELEASE.jar:4.1.1.RELEASE]
    at org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:214) ~[spring-orm-4.1.1.RELEASE.jar:4.1.1.RELEASE]
    at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.translateExceptionIfPossible(AbstractEntityManagerFactoryBean.java:417) ~[spring-orm-4.1.1.RELEASE.jar:4.1.1.RELEASE]
    at org.springframework.dao.support.ChainedPersistenceExceptionTranslator.translateExceptionIfPossible(ChainedPersistenceExceptionTranslator.java:59) ~[spring-tx-4.1.1.RELEASE.jar:4.1.1.RELEASE]
    at org.springframework.dao.support.DataAccessUtils.translateIfNecessary(DataAccessUtils.java:213) ~[spring-tx-4.1.1.RELEASE.jar:4.1.1.RELEASE]
    at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:147) ~[spring-tx-4.1.1.RELEASE.jar:4.1.1.RELEASE]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.1.1.RELEASE.jar:4.1.1.RELEASE]
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207) ~[spring-aop-4.1.1.RELEASE.jar:4.1.1.RELEASE]
    at com.sun.proxy.$Proxy270.listLossDetails(Unknown Source) ~[na:na]
    at com.cvrr.btq.service.impl.BotiqueServiceImpl.listLossDetails(BotiqueServiceImpl.java:45) ~[BotiqueServiceImpl.class:na]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_40]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_40]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_40]
    at java.lang.reflect.Method.invoke(Method.java:497) ~[na:1.8.0_40]
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317) ~[spring-aop-4.1.1.RELEASE.jar:4.1.1.RELEASE]
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:201) ~[spring-aop-4.1.1.RELEASE.jar:4.1.1.RELEASE]
    at com.sun.proxy.$Proxy271.listLossDetails(Unknown Source) ~[na:na]
    at com.cvrr.btq.controller.BotiqueController.listLossDetails(BotiqueController.java:44) ~[BotiqueController.class:na]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_40]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_40]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_40]
    at java.lang.reflect.Method.invoke(Method.java:497) ~[na:1.8.0_40]
    at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:215) ~[spring-web-4.1.1.RELEASE.jar:4.1.1.RELEASE]
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132) ~[spring-web-4.1.1.RELEASE.jar:4.1.1.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104) ~[spring-webmvc-4.1.1.RELEASE.jar:4.1.1.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:781) ~[spring-webmvc-4.1.1.RELEASE.jar:4.1.1.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:721) ~[spring-webmvc-4.1.1.RELEASE.jar:4.1.1.RELEASE]
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83) ~[spring-webmvc-4.1.1.RELEASE.jar:4.1.1.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:943) ~[spring-webmvc-4.1.1.RELEASE.jar:4.1.1.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877) ~[spring-webmvc-4.1.1.RELEASE.jar:4.1.1.RELEASE]
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966) [spring-webmvc-4.1.1.RELEASE.jar:4.1.1.RELEASE]
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857) [spring-webmvc-4.1.1.RELEASE.jar:4.1.1.RELEASE]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:618) [servlet-api.jar:na]
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842) [spring-webmvc-4.1.1.RELEASE.jar:4.1.1.RELEASE]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:725) [servlet-api.jar:na]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291) [catalina.jar:8.0.20]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [catalina.jar:8.0.20]
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) [tomcat-websocket.jar:8.0.20]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) [catalina.jar:8.0.20]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [catalina.jar:8.0.20]
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219) [catalina.jar:8.0.20]
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106) [catalina.jar:8.0.20]
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501) [catalina.jar:8.0.20]
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142) [catalina.jar:8.0.20]
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) [catalina.jar:8.0.20]
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610) [catalina.jar:8.0.20]
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) [catalina.jar:8.0.20]
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:516) [catalina.jar:8.0.20]
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1086) [tomcat-coyote.jar:8.0.20]
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:659) [tomcat-coyote.jar:8.0.20]
    at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:223) [tomcat-coyote.jar:8.0.20]
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1558) [tomcat-coyote.jar:8.0.20]
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1515) [tomcat-coyote.jar:8.0.20]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_40]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_40]
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-util.jar:8.0.20]
    at java.lang.Thread.run(Thread.java:745) [na:1.8.0_40]
Caused by: org.hibernate.MappingException: Unknown entity: com.cvrr.btq.model.LossDetails
    at org.hibernate.internal.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:1146) ~[hibernate-core-4.2.11.Final.jar:4.2.11.Final]
    at org.hibernate.loader.custom.sql.SQLQueryReturnProcessor.getSQLLoadable(SQLQueryReturnProcessor.java:336) ~[hibernate-core-4.2.11.Final.jar:4.2.11.Final]
    at org.hibernate.loader.custom.sql.SQLQueryReturnProcessor.processRootReturn(SQLQueryReturnProcessor.java:377) ~[hibernate-core-4.2.11.Final.jar:4.2.11.Final]
    at org.hibernate.loader.custom.sql.SQLQueryReturnProcessor.processReturn(SQLQueryReturnProcessor.java:356) ~[hibernate-core-4.2.11.Final.jar:4.2.11.Final]
    at org.hibernate.loader.custom.sql.SQLQueryReturnProcessor.process(SQLQueryReturnProcessor.java:172) ~[hibernate-core-4.2.11.Final.jar:4.2.11.Final]
    at org.hibernate.loader.custom.sql.SQLCustomQuery.<init>(SQLCustomQuery.java:87) ~[hibernate-core-4.2.11.Final.jar:4.2.11.Final]
    at org.hibernate.engine.query.spi.NativeSQLQueryPlan.<init>(NativeSQLQueryPlan.java:67) ~[hibernate-core-4.2.11.Final.jar:4.2.11.Final]
    at org.hibernate.engine.query.spi.QueryPlanCache.getNativeSQLQueryPlan(QueryPlanCache.java:197) ~[hibernate-core-4.2.11.Final.jar:4.2.11.Final]
    at org.hibernate.internal.AbstractSessionImpl.getNativeSQLQueryPlan(AbstractSessionImpl.java:226) ~[hibernate-core-4.2.11.Final.jar:4.2.11.Final]
    at org.hibernate.internal.AbstractSessionImpl.list(AbstractSessionImpl.java:232) ~[hibernate-core-4.2.11.Final.jar:4.2.11.Final]
    at org.hibernate.internal.SQLQueryImpl.list(SQLQueryImpl.java:157) ~[hibernate-core-4.2.11.Final.jar:4.2.11.Final]
    at org.hibernate.ejb.QueryImpl.getResultList(QueryImpl.java:268) ~[hibernate-entitymanager-4.2.11.Final.jar:4.2.11.Final]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_40]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_40]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_40]
    at java.lang.reflect.Method.invoke(Method.java:497) ~[na:1.8.0_40]
    at org.springframework.orm.jpa.SharedEntityManagerCreator$DeferredQueryInvocationHandler.invoke(SharedEntityManagerCreator.java:360) ~[spring-orm-4.1.1.RELEASE.jar:4.1.1.RELEASE]
    at com.sun.proxy.$Proxy277.getResultList(Unknown Source) ~[na:na]
    at com.cvrr.btq.dao.impl.BotiqueDAOImpl.listLossDetails(BotiqueDAOImpl.java:107) ~[BotiqueDAOImpl.class:na]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_40]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_40]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_40]
    at java.lang.reflect.Method.invoke(Method.java:497) ~[na:1.8.0_40]
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317) ~[spring-aop-4.1.1.RELEASE.jar:4.1.1.RELEASE]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190) ~[spring-aop-4.1.1.RELEASE.jar:4.1.1.RELEASE]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) ~[spring-aop-4.1.1.RELEASE.jar:4.1.1.RELEASE]
    at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:136) ~[spring-tx-4.1.1.RELEASE.jar:4.1.1.RELEASE]
    ... 51 common frames omitted
Oct 18, 2015 4:09:06 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [SpringDispatcher] in context with path [/Botique] threw exception [Request processing failed; nested exception is org.springframework.orm.jpa.JpaSystemException: Unknown entity: com.cvrr.btq.model.LossDetails; nested exception is org.hibernate.MappingException: Unknown entity: com.cvrr.btq.model.LossDetails] with root cause
org.hibernate.MappingException: Unknown entity: com.cvrr.btq.model.LossDetails
    at org.hibernate.internal.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:1146)
    at org.hibernate.loader.custom.sql.SQLQueryReturnProcessor.getSQLLoadable(SQLQueryReturnProcessor.java:336)
    at org.hibernate.loader.custom.sql.SQLQueryReturnProcessor.processRootReturn(SQLQueryReturnProcessor.java:377)
    at org.hibernate.loader.custom.sql.SQLQueryReturnProcessor.processReturn(SQLQueryReturnProcessor.java:356)
    at org.hibernate.loader.custom.sql.SQLQueryReturnProcessor.process(SQLQueryReturnProcessor.java:172)
    at org.hibernate.loader.custom.sql.SQLCustomQuery.<init>(SQLCustomQuery.java:87)
    at org.hibernate.engine.query.spi.NativeSQLQueryPlan.<init>(NativeSQLQueryPlan.java:67)
    at org.hibernate.engine.query.spi.QueryPlanCache.getNativeSQLQueryPlan(QueryPlanCache.java:197)
    at org.hibernate.internal.AbstractSessionImpl.getNativeSQLQueryPlan(AbstractSessionImpl.java:226)
    at org.hibernate.internal.AbstractSessionImpl.list(AbstractSessionImpl.java:232)
    at org.hibernate.internal.SQLQueryImpl.list(SQLQueryImpl.java:157)
    at org.hibernate.ejb.QueryImpl.getResultList(QueryImpl.java:268)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at org.springframework.orm.jpa.SharedEntityManagerCreator$DeferredQueryInvocationHandler.invoke(SharedEntityManagerCreator.java:360)
    at com.sun.proxy.$Proxy277.getResultList(Unknown Source)
    at com.cvrr.btq.dao.impl.BotiqueDAOImpl.listLossDetails(BotiqueDAOImpl.java:107)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
    at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:136)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207)
    at com.sun.proxy.$Proxy270.listLossDetails(Unknown Source)
    at com.cvrr.btq.service.impl.BotiqueServiceImpl.listLossDetails(BotiqueServiceImpl.java:45)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:201)
    at com.sun.proxy.$Proxy271.listLossDetails(Unknown Source)
    at com.cvrr.btq.controller.BotiqueController.listLossDetails(BotiqueController.java:44)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:215)
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:781)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:721)
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:943)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966)
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:618)
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:516)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1086)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:659)
    at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:223)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1558)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1515)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:745)
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我的实体类的注释为：

@SqlResultSetMapping(
        name = "LossDetailsMapping",
        entities = @EntityResult(
                entityClass = LossDetails.class,
                fields={
                    @FieldResult(name = "billId", column = "billId"),
                    @FieldResult(name = "billSrlNum", column = "billSrlNum"),
                    @FieldResult(name = "totalInItems", column = "totalInItems"),
                    @FieldResult(name = "totalInAmount", column = "totalInAmount"),
                    @FieldResult(name = "totalSoldItems", column = "totalSoldItems"),
                    @FieldResult(name = "totalSoldAmount", column = "totalSoldAmount"),
                    @FieldResult(name = "remItems", column = "remItems"),
                    @FieldResult(name = "loss", column = "loss")
                }
                )
        )
public class LossDetails {
//setter, getter are here
}
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我的 JPA 查询是：

LIST_LOSS_PROFIT_DETAILS="SELECT sd_data.bill_id as billId ,"
            + "  sd_data.bill_srl_no as billSrlNum ," + "  sd_data.total_act_qnt as totalInItems ,"
            + "  sd_data.tot_act_

Ish*_*Ish 5

有两种方法可以将本机 SQL 查询的结果集映射到类 - 通过@EntityResult和@ConstructorResult

@EntityResult 可以从本机 SQL 查询中检索托管实体。您可以将通过 SQL 查询返回的值映射到实体属性。例如，您有一个实体类LossDetails.class并映射到LOSS_DETAILS表。

@Entity
@Table(name="LOSS_DETAILS)
public class LossDetails {
    @Id
    private Long billId;

    private String billSrlNum;

    private Integer totalInItems;

    private Double totalInAmount;

    private Integer totalSoldItems;

    private Double totalSoldAmount;

    private Integer remItems;

    private Double loss;
}
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然后，例如您的本机 SQL 查询将返回 ff。列：

BILL_ID, BILL_SRL_NO, TOTAL_ACT_QNT, TOTAL_ACT_RT, SOLD_QNT, SOLD_ACT_RT, REM_ITEMS, LOSS
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请注意，列名称与实体类的属性名称不完全匹配LossDetails。为此，您需要@SqlResultSetMapping像这样指定：

@SqlResultSetMapping(name="LossDetailsMapping",
    entities=@EntityResult(
        entityClass=LossDetails.class,
        fields={
            @FieldResult(name="billId", column="BILL_ID"),
            @FieldResult(name="billSrlNum", column="BILL_SRL_NO"),
            @FieldResult(name="totalInItems", column="TOTAL_ACT_QNT"),
            @FieldResult(name="totalInAmount", column="TOTAL_ACT_RT"),
            @FieldResult(name="totalSoldItems", column="SOLD_QNT"),
            @FieldResult(name="totalSoldAmount", column="SOLD_ACT_RT"),
            @FieldResult(name="remItems", column="REM_ITEMS"),
            @FieldResult(name="loss", column="LOSS")
        }
    )
)
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如果您的 SQL 列和实体属性与名称完全匹配，则您不需要枚举字段。像这样：

@SqlResultSetMapping(name="LossDetailsMapping",
    entities=@EntityResult(
        entityClass=LossDetails.class)
)
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请注意，只要结果列将映射到每个实体属性并且它们的类型兼容，本机 SQL 查询就可能从另一个表（不同于映射到实体的表）中进行选择。

要在创建本机查询时使用声明的结果集映射，只需按其名称引用即可。下面的例子：

private String LIST_LOSS_PROFIT_DETAILS = "...YOUR NATIVE SQL QUERY HERE...";

Query query = entityManager.createNativeQuery(LIST_LOSS_PROFIT_DETAILS, "LossDetailsMapping");
List lossDtls = query.getResultList();
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@ConstructorResult

如果您的目的只是将本机 SQL 的结果映射到 POJO 或 bean 类，并且该 bean 不一定必须通过对其执行保存/更新/删除操作来管理，那么您不需要实体班级。您实际上可以将 SQL 结果集列映射到纯 Java 对象。我相信这是您想要使用的。随着JPA 2.1版本，你必须构建能力非实体类型从通机查询@ConstructorResult。

下面是一个例子：

public class LossDetails {

    public LostDetails(Long billId, String billSrlNum, 
        Integer totalInItems, Double totalInAmount, 
        Integer totalSoldItems, Double totalSoldAmount,
        Integer remItems, Double loss) {
        this.billId = billId;
        this.billSrlNum = billSrlNum;
        this.totalInItems = totalInItems;
        this.totalInAmount = totalInAmount;
        this.totalSoldItems = totalSoldItems;
        this.totalSoldAmount = totalSoldAmount;
        this.remItems = remItems;
        this.loss = loss;
    }

    private Long billId;

    private String billSrlNum;

    private Integer totalInItems;

    private Double totalInAmount;

    private Integer totalSoldItems;

    private Double totalSoldAmount;

    private Integer remItems;

    private Double loss;
}
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请注意，这LossDetails只是一个 POJO，没有用@Entity. 还要注意构造函数的存在。使用的 sql 结果集映射@ConstructorResult将使用此构造函数从本机 SQL 查询结果中创建 POJO。

根据 JPA 规范：

必须使用 ConstructorResult 注释的列元素以与构造函数的参数列表相同的顺序指定与预期构造函数的参数相对应的所有列。

所以这是一个使用示例@ConstructorResult：

@SqlResultSetMapping(name="LossDetailsMapping",
    classes={
        @ConstructorResult(targetClass=LossDetails.class,
            columns={
                @ColumnResult(name="billId", type=Long.class),
                @ColumnResult(name="billSrlNum", type=String.class),
                @ColumnResult(name="totalInItems", type=Integer.class),
                @ColumnResult(name="totalInAmount", type=Double.class),
                @ColumnResult(name="totalSoldItems", type=Integer.class),
                @ColumnResult(name="totalSoldAmount", type=Double.class),
                @ColumnResult(name="remItems", type=Integer.class),
                @ColumnResult(name="loss", type=Double.class)
            })
    }
)
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我不确定您使用的是哪个 JPA 版本 2.0 或 2.1。@ConstructorResult仅在 JPA 2.1 版本中受支持。检查是否可以导入java.persistence.ConstructorResult而不会出现任何编译错误。

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