JPQL，Hibernate的語法錯誤，而查詢數據庫

我有這些類：JPQL，Hibernate的語法錯誤，而查詢數據庫

public class UserCredential { 

    @NotNull(message ="The password must not be null !") 
    @NotEmpty(message="The password must not be empty !") 
    private String password; 

    @NotNull(message ="The email/name must not be null !") 
    @NotEmpty(message="The email/name must not be empty !") 
    private String email; 
    //GETTERS AND SETTERS 
}

和我真正的實體是這樣的：

@Entity 
public class BlogUser { 

    @Id 
    @GeneratedValue 
    private Long id; 

    private String name; 
    private String email; 
    private String password; 
    private String website; 

    //GETTERS AND SETTERS 
}

我使用Spring和在我的存儲庫層我有一個方法是這樣的：

public boolean isValidLogin(UserCredential userCredential) { 
    List <BlogUser> list = em.createQuery("SELECT c FROM BlogUser c WHERE c.email = " + userCredential.getEmail()+ " AND c.password = " + userCredential.getPassword()).getResultList(); 

    if (list.size() == 1) { 
     return true; 
    } else { 
     return false; 
    } 
}

但是當我的程序要執行查詢我得到這個錯誤：

HTTP Status 500 - Request processing failed; nested exception is javax.persistence.PersistenceException: org.hibernate.exception.SQLGrammarException: could not extract ResultSet 

type Exception report 

message Request processing failed; nested exception is javax.persistence.PersistenceException: org.hibernate.exception.SQLGrammarException: could not extract ResultSet 

description The server encountered an internal error that prevented it from fulfilling this request. 

exception 

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is javax.persistence.PersistenceException: org.hibernate.exception.SQLGrammarException: could not extract ResultSet 
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:948) 
    org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:838) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:647) 
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728) 
    org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter.doFilterInternal(OpenEntityManagerInViewFilter.java:180) 
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) 

root cause 

javax.persistence.PersistenceException: org.hibernate.exception.SQLGrammarException: could not extract ResultSet 
    org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1387) 
    org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1310) 
    org.hibernate.ejb.QueryImpl.getResultList(QueryImpl.java:277) 
    com.sts.repository.UserRepositoryImpl.isValidLogin(UserRepositoryImpl.java:52) 
    com.sts.service.UserServiceImpl.isValidLogin(UserServiceImpl.java:37) 
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    java.lang.reflect.Method.invoke(Method.java:606) 
    org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317) 
    org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:198) 
    com.sun.proxy.$Proxy44.isValidLogin(Unknown Source) 
    com.sts.controller.Welcome.loginUser(Welcome.java:53) 
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    java.lang.reflect.Method.invoke(Method.java:606) 
    org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:219) 
    org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132) 
    org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104) 
    org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:745) 
    org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:686) 
    org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80) 
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925) 
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856) 
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:936) 
    org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:838) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:647) 
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728) 
    org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter.doFilterInternal(OpenEntityManagerInViewFilter.java:180) 
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) 

root cause 

org.hibernate.exception.SQLGrammarException: could not extract ResultSet 
    org.hibernate.exception.internal.SQLStateConversionDelegate.convert(SQLStateConversionDelegate.java:123) 
    org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:49) 
    org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:125) 
    org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:110) 
    org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.extract(ResultSetReturnImpl.java:61) 
    org.hibernate.loader.Loader.getResultSet(Loader.java:2040) 
    org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1837) 
    org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1816) 
    org.hibernate.loader.Loader.doQuery(Loader.java:900) 
    org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:342) 
    org.hibernate.loader.Loader.doList(Loader.java:2526) 
    org.hibernate.loader.Loader.doList(Loader.java:2512) 
    org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2342) 
    org.hibernate.loader.Loader.list(Loader.java:2337) 
    org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:495) 
    org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:356) 
    org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:195) 
    org.hibernate.internal.SessionImpl.list(SessionImpl.java:1269) 
    org.hibernate.internal.QueryImpl.list(QueryImpl.java:101) 
    org.hibernate.ejb.QueryImpl.getResultList(QueryImpl.java:268) 
    com.sts.repository.UserRepositoryImpl.isValidLogin(UserRepositoryImpl.java:52) 
    com.sts.service.UserServiceImpl.isValidLogin(UserServiceImpl.java:37) 
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    java.lang.reflect.Method.invoke(Method.java:606) 
    org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317) 
    org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:198) 
    com.sun.proxy.$Proxy44.isValidLogin(Unknown Source) 
    com.sts.controller.Welcome.loginUser(Welcome.java:53) 
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    java.lang.reflect.Method.invoke(Method.java:606) 
    org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:219) 
    org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132) 
    org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104) 
    org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:745) 
    org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:686) 
    org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80) 
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925) 
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856) 
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:936) 
    org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:838) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:647) 
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728) 
    org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter.doFilterInternal(OpenEntityManagerInViewFilter.java:180) 
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) 

root cause 

org.postgresql.util.PSQLException: ERROR: column "mehdi" does not exist 
    Position: 286 
    org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2157) 
    org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1886) 
    org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:255) 
    org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:555) 
    org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:417) 
    org.postgresql.jdbc2.AbstractJdbc2Statement.executeQuery(AbstractJdbc2Statement.java:302) 
    org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.extract(ResultSetReturnImpl.java:56) 
    org.hibernate.loader.Loader.getResultSet(Loader.java:2040) 
    org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1837) 
    org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1816) 
    org.hibernate.loader.Loader.doQuery(Loader.java:900) 
    org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:342) 
    org.hibernate.loader.Loader.doList(Loader.java:2526) 
    org.hibernate.loader.Loader.doList(Loader.java:2512) 
    org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2342) 
    org.hibernate.loader.Loader.list(Loader.java:2337) 
    org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:495) 
    org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:356) 
    org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:195) 
    org.hibernate.internal.SessionImpl.list(SessionImpl.java:1269) 
    org.hibernate.internal.QueryImpl.list(QueryImpl.java:101) 
    org.hibernate.ejb.QueryImpl.getResultList(QueryImpl.java:268) 
    com.sts.repository.UserRepositoryImpl.isValidLogin(UserRepositoryImpl.java:52) 
    com.sts.service.UserServiceImpl.isValidLogin(UserServiceImpl.java:37) 
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    java.lang.reflect.Method.invoke(Method.java:606) 
    org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317) 
    org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:198) 
    com.sun.proxy.$Proxy44.isValidLogin(Unknown Source) 
    com.sts.controller.Welcome.loginUser(Welcome.java:53) 
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    java.lang.reflect.Method.invoke(Method.java:606) 
    org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:219) 
    org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132) 
    org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104) 
    org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:745) 
    org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:686) 
    org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80) 
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925) 
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856) 
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:936) 
    org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:838) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:647) 
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728) 
    org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter.doFilterInternal(OpenEntityManagerInViewFilter.java:180) 
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

這是我的示例查詢跟蹤：

Hibernate: 
select 
    tuser0_.id as id1_1_, 
    tuser0_.email as email2_1_, 
    tuser0_.name as name3_1_, 
    tuser0_.password as password4_1_, 
    tuser0_.website as website6_1_ 
from 
    BlogUser tuser0_ 
where 
    tuser0_.email=mehdi 
    and tuser0_.password=123456

你認爲

，這是什麼問題???

來源

2013-10-09 Mehdi

在構建您的查詢，而參數（這是一個壞主意），你需要採取報價照顧，並鍵入皈依等等

List <BlogUser> list = em.createQuery("SELECT c FROM BlogUser c WHERE c.email = '" + userCredential.getEmail()+ "' AND c.password = '" + userCredential.getPassword()+"'").getResultList();

一個更好的解決方案是使用參數：

List <BlogUser> list = em.createQuery("SELECT c FROM BlogUser c WHERE c.email = :email AND c.password = :pwd") 
    .setParameter("email",userCredential.getEmail()) 
    .setParameter("pwd",userCredential.getPassword()) 
    .getResultList();

來源

2013-10-09 15:03:30 ben75

老兄我的眼睛裏充滿了疲憊，我沒有看到真正的報價！噴 – Mehdi

和ben75的答案一樣，最好使用參數而不是修改查詢字符串。

另一個問題是，你可能試圖獲得一個BlogUser的列表只是爲了計數它們。想象一下，BlogUser有一個渴望的屬性列表。您可能最終只做很多選擇，看是否有任何BlogUser具有所需的電子郵件/密碼。

將計數部分委託給數據庫會更好。

public boolean isValidLogin(UserCredential userCredential) { 
    Integer count = (Integer)em.createQuery(
    "SELECT count(c.id) "+ 
    "FROM BlogUser c " + 
    "WHERE c.email = :email AND c.password = :pwd") 
     .setParameter("email",userCredential.getEmail()) 
     .setParameter("pwd",userCredential.getPassword()) 
     .getSingleResult(); 
    if (count == 1) { 
     return true; 
    } else { 
     return false; 
    } 
}

來源

2016-11-29 19:08:17 chalailama

JPQL，Hibernate的語法錯誤，而查詢數據庫

回答

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