SQLGrammar 異常，執行本機查詢時可能找不到“Id”

Question

我有以下表格：

標准認證大師

QualificationId studentRegNo CourseName Percentage

1               1            A           91 
2               1            B           81
3               1            C           71
4               1            D           61
5               2            A           91
6               2            B           81
7               2            C           71
8               2            D           50

考官：

TestId  studentRegNo testLevel percentage

1       1            1         91 
2       1            2         81
3       1            3         71
4       2            1         80
5       2            2         99
6       2            3         87

這是我的PlacementDaoRdbms類，它執行上面 2 個表的本機 SQL 查詢：

PlacementDaoRdbms

package com.ms.avalon.master.dao.rdbms;

import java.util.ArrayList;
import java.util.List;
import org.hibernate.SQLQuery;
import org.hibernate.Transaction;
import org.hibernate.criterion.DetachedCriteria;
import com.ms.avalon.master.beans.PlacementCaseBean;
import com.ms.avalon.master.dao.PlacementDao;
import com.ms.avalon.master.formbeans.PlacementFormBean;
import com.ms.avalon.master.pojos.studentpojos.StudentEduPojo;
import com.ms.avalon.master.pojos.studentpojos.StudentTestPojo;

public class PlacementDaoRdbms extends DBConnectionDao implements PlacementDao {

@Override
public List<StudentEduPojo> searchWithCases(PlacementCaseBean caseBean, PlacementFormBean placementBean) {

    System.out.println(session);
    System.out.println(hibernateTemplate);

    DetachedCriteria criteriaE = DetachedCriteria.forClass(StudentEduPojo.class, "qualTable");
    DetachedCriteria criteriaT = DetachedCriteria.forClass(StudentTestPojo.class, "testTable");

    String query = 
            "SELECT stdqualificationmaster.studentRegNo "
            + "FROM "
            + "(SELECT studentRegNo FROM stdqualificationmaster "
            + "WHERE (CourseName = 'High School' AND Percentage >= 90) "
            + "OR (CourseName = 'Intermediate' AND Percentage >= 80) "
            + "OR (CourseName = 'BCA' AND Percentage >= 70) "
            + "OR (CourseName = 'MCA' AND Percentage >= 60) "
            + "GROUP BY studentRegNo "
            + "HAVING COUNT(1) = 4 "
            + ") stdqualificationmaster JOIN "
            + "(SELECT studentRegNo FROM testmaster "
            + "WHERE (testLevel = '1' AND percentage >= 90) "
            + "OR (testLevel = '2' AND percentage >= 80) "
            + "OR (testLevel = '3' AND percentage >= 70) "
            + "GROUP BY studentRegNo "
            + "HAVING COUNT(1) = 3 "
            + ") testmaster ON stdqualificationmaster.studentRegNo = testmaster.studentRegNo;";

    Transaction tx = session.beginTransaction();
    SQLQuery q = session.createSQLQuery(query)
    .addEntity(StudentEduPojo.class);

    List<StudentEduPojo> list = q.list();
    System.out.println(list.size());

    return null;
}

}

好的，所以基本上 SQL 查詢會搜索與兩個表中的最低條件相匹配的 studentRegNo（具有最低資格和測試百分比）。 一旦查詢執行，就會拋出以下異常。

休眠：SELECT * FROM (SELECT studentRegNo FROM stdqualificationmaster WHERE (CourseName = 'High School' AND Percentage >= 90) OR (CourseName = 'Intermediate' AND Percentage >= 80) OR (CourseName = 'BCA' AND Percentage >= 70) OR (CourseName = 'MCA' AND Percentage >= 60) GROUP BY studentRegNo HAVING COUNT(1) = 4 ) stdqualificationmaster JOIN (SELECT studentRegNo FROM testmaster WHERE (testLevel = '1' AND 百分比 >= 90) OR (testLevel = '2 ' AND 百分比 >= 80) OR (testLevel = '3' AND 百分比 >= 70) GROUP BY studentRegNo HAVING COUNT(1) = 3 ) testmaster ON stdqualificationmaster.studentRegNo = testmaster.studentRegNo;

2016 年 5 月 12 日下午 3:37:50 org.apache.catalina.core.StandardWrapperValve 調用嚴重：Servlet.service() for servlet [dispatcher] in context with path [/Avalon-1.0] 拋出異常 [Request processing failed; 嵌套異常是org.hibernate.exception.SQLGrammarException：無法執行查詢]，根本原因是 java.sql.SQLException：未找到列“QualificationId”。 在 com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1055) 在 com.mysql.jdbc.SQLError.createSQLException(SQLError.java:956) 在 com.mysql.jdbc.SQLError.createSQLException(SQLError.java:926) ) 在 com.mysql.jdbc.ResultSetImpl.findColumn(ResultSetImpl.java:1136) 在 com.mysql.jdbc.ResultSetImpl.getInt(ResultSetImpl.java:2777) 在 org.apache.commons.dbcp.DelegatingResultSet.getInt(DelegatingResultSet. java:236) at org.hibernate.type.IntegerType.get(IntegerType.java:28) at org.hibernate.type.NullableType.nullSafeGet(NullableType.java:113) at org.hibernate.type.NullableType.nullSafeGet(NullableType) .java:102) 在 org.hibernate.loader.Loader.getKeyFromResultSet(Loader.java:1088) 在 org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:553) 在 org.hibernate.loader.Loader.doQuery( Loader.java:689) 在 org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:224) 在 org.hibernate.loader.Loader.doList(Loader.java:2144) 在 org.hibernate.loader.Loader.listIgnoreQueryCache (L oader.java:2028) 在 org.hibernate.loader.Loader.list(Loader.java:2023) 在 org.hibernate.loader.custom.CustomLoader.list(CustomLoader.java:289) 在 org.hibernate.impl.SessionImpl .listCustomQuery(SessionImpl.java:1695) 在 org.hibernate.impl.AbstractSessionImpl.list(AbstractSessionImpl.java:142) 在 org.hibernate.impl.SQLQueryImpl.list(SQLQueryImpl.java:150) 在 com.ms.avalon。 master.dao.rdbms.PlacementDaoRdbms.searchWithCases(PlacementDaoRdbms.java:107) at com.ms.avalon.master.business.TalentCaseHandler.searchForCases(TalentCaseHandler.java:63) at com.ms.avalon.master.service.impl。 PlacementServiceImpl.searchForTalent(PlacementServiceImpl.java:31) at com.ms.avalon.master.controllers.PlacementController.searchForTalent(PlacementController.java:29) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl。 invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org .springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176) 在 org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:427) 在 org.springframework.web. .servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:415) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:788) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.doService(DispatcherServlet.java:788) .java:717) 在 org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644) 在 org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:560) 在 javax.servlet.http。 HttpServlet.service(HttpServlet.java:646) at javax.servlet.http.HttpServlet.service(HttpServlet.java:727) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303) at org.apache .catali na.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) 在 org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) 在 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain. java:241) 在 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) 在 com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java:119) 在 com.opensymphony.module .sitemesh.filter.PageFilter.doFilter(PageFilter.java:55) 在 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) 在 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java :208) 在 org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220) 在 org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122) 在 org.apache.catalina.authen AuthenticatorBase.invoke(AuthenticatorBase.java:504) 在 org.apache.catalina.core.Stand ardHostValve.invoke(StandardHostValve.java:170) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950) .apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:421) at org.apache.coyote.http11.AbstractHttp11Processor.processProcess(AbstractHttp11) .java:1074) 在 org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611) 在 org.apache.tomcat.util.net.JioEndpoint$SocketProcessor.run(JioEndpoint.java:316) 在 java。 util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)在 java.lang.Thread.run（未知來源）

現在，我不知道為什么它首先要尋找 QualificationId 列，即使它是，為什么沒有找到它？

Answer 1

這是因為您的實體StudentEduPojo已將主鍵 (@Id) 定義為QualificationId 。 所以它在搜索結果中搜索並沒有找到它。

最好在實體中將studentRegNo設置為 Id 或更改查詢以返回QualificationId 。

注意：您還必須進行@Joop Eggen 的另一個答案中所說的更改（字段名稱的別名問題）

Answer 2

我的猜測是別名會造成嚴重破壞。

不確定 2 GROUP BY 是否有效，但以下似乎可行，甚至可能是AND EXISTS( .... s.studentRegNo = studentRegno) 。

String query = 
        "SELECT studentRegNo FROM stdqualificationmaster s "
        + "WHERE (CourseName = 'High School' AND Percentage >= 90) "
        + "OR (CourseName = 'Intermediate' AND Percentage >= 80) "
        + "OR (CourseName = 'BCA' AND Percentage >= 70) "
        + "OR (CourseName = 'MCA' AND Percentage >= 60) "
        + "GROUP BY studentRegNo "
        + "HAVING COUNT(1) = 4 "
        + "AND "
        + "studentRegNo IN (SELECT studentRegNo FROM testmaster "
        + "WHERE (testLevel = '1' AND percentage >= 90) "
        + "OR (testLevel = '2' AND percentage >= 80) "
        + "OR (testLevel = '3' AND percentage >= 70) "
        + "GROUP BY studentRegNo "
        + "HAVING COUNT(1) = 3 "
        + ")";