Question

我在Net-Beans IDE中有一个现有的JavaFX项目，我使用过JDBC。现在我想使用JPA。 Generel CRUD操作正常。但问题在于搜索时间。

我可以通过JPQL和Native Query进行搜索。作为JPA实现我正在使用Hibernate。但问题在于CriteriaBuilder。我正在关注此链接： Chapter 9. Criteria Queries。在本文中，我发现我必须使用Metamodel。正如文章所述，我已经阅读了这篇文章：Chapter 4. Metamodel

根据这篇文章，我创建了元模型类。

主要类

package com.vocubulary.model;

import javax.persistence.Entity;
import javax.persistence.Id;
import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.NoArgsConstructor;
import lombok.Setter;
import lombok.ToString;

@ToString
@NoArgsConstructor
@AllArgsConstructor
@Entity
public class Model_E2B_WordList
    {
        @Id @Getter @Setter
        private String e2b_word;
    }

元模型类：

package com.vocubulary.model;

import javax.annotation.Generated;
import javax.persistence.metamodel.SingularAttribute;
import javax.persistence.metamodel.StaticMetamodel;


@StaticMetamodel(Model_E2B_WordList.class)
public  class Model_E2B_WordList_ 
    {

    public static volatile SingularAttribute<Model_E2B_WordList, String> e2b_word;
    }

DAO课程：

@Test
     public void dao_e2b_get_wordsList_afterSerach_clean()
        {
        String e2b_searchKey = "cat";
        EntityManager entityManager_local = EntityManagerUtil.getEntityManager();
        List<Model_E2B_WordList> list_e2b_wordList = null;
        try
          {
            entityManager_local.getTransaction().begin();
            CriteriaBuilder criteriaBuilder = entityManager_local.getCriteriaBuilder();
            CriteriaQuery<Model_E2B_WordList> criteriaQuery = criteriaBuilder.createQuery(Model_E2B_WordList.class);
            Root<Model_E2B_WordList> e2b_wordList_Root = criteriaQuery.from(Model_E2B_WordList.class);
            criteriaQuery.where(criteriaBuilder.like(criteriaBuilder.lower(e2b_wordList_Root.get(Model_E2B_WordList_.getE2b_word())), "cat".toLowerCase() + "%"));            
            List<Model_E2B_WordList> e2b_wordList = entityManager_local.createQuery(criteriaQuery).getResultList();
            System.out.println(" Worlist Length : "+e2b_wordList.size());

            entityManager_local.getTransaction().commit();
          }
        catch (Exception e)
          {
            System.out.println("\n\n\n E2B word by Search Key.");
            e.printStackTrace();
            System.out.println("\n\n\n");
            entityManager_local.getTransaction().rollback();
          }
        }

我的IDE显示此行中的错误，具体在Model_E2B_WordList_这里：

criteriaQuery.where(criteriaBuilder.like(criteriaBuilder.lower(e2b_wordList_Root.get(Model_E2B_WordList_.getE2b_word())), "cat".toLowerCase() + "%"));

我也注意到有一个包生成了：

现在在我的主package com.vocubulary.model包中，我还有一个名为Model_E2B_WordList_的类。如果我正在编译它，则编译错误显示：

error: duplicate class: com.vocubulary.model.Model_E2B_WordList_
public abstract class Model_E2B_WordList_ {

如果我从主package com.vocubulary.model中删除该类，则会显示以下错误消息：

Note: Hibernate JPA 2 Static-Metamodel Generator 4.3.1.Final
An exception has occurred in the compiler (1.8.0_102). Please file a bug against the Java compiler via the Java bug reporting page (http://bugreport.java.com) after checking the Bug Database (http://bugs.java.com) for duplicates. Include your program and the following diagnostic in your report. Thank you.
java.lang.IllegalStateException: endPosTable already set
    at com.sun.tools.javac.util.DiagnosticSource.setEndPosTable(DiagnosticSource.java:136)
    at com.sun.tools.javac.util.Log.setEndPosTable(Log.java:350)
    at com.sun.tools.javac.main.JavaCompiler.parse(JavaCompiler.java:667)
    at com.sun.tools.javac.main.JavaCompiler.parseFiles(JavaCompiler.java:950)
    at com.sun.tools.javac.processing.JavacProcessingEnvironment$Round.<init>(JavacProcessingEnvironment.java:892)
    at com.sun.tools.javac.processing.JavacProcessingEnvironment$Round.next(JavacProcessingEnvironment.java:921)
    at com.sun.tools.javac.processing.JavacProcessingEnvironment.doProcessing(JavacProcessingEnvironment.java:1187)
    at com.sun.tools.javac.main.JavaCompiler.processAnnotations(JavaCompiler.java:1170)
    at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:856)
    at com.sun.tools.javac.main.Main.compile(Main.java:523)
    at com.sun.tools.javac.main.Main.compile(Main.java:381)
    at com.sun.tools.javac.main.Main.compile(Main.java:370)
    at com.sun.tools.javac.main.Main.compile(Main.java:361)
    at com.sun.tools.javac.Main.compile(Main.java:56)
    at sun.reflect.GeneratedMethodAccessor539.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.apache.tools.ant.taskdefs.compilers.Javac13.execute(Javac13.java:57)
    at org.apache.tools.ant.taskdefs.Javac.compile(Javac.java:1344)
    at org.apache.tools.ant.taskdefs.Javac.execute(Javac.java:1070)
    at org.netbeans.modules.java.source.ant.JavacTask.execute(JavacTask.java:145)
    at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:293)
    at sun.reflect.GeneratedMethodAccessor435.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
    at org.apache.tools.ant.Task.perform(Task.java:348)
    at org.apache.tools.ant.taskdefs.Sequential.execute(Sequential.java:68)
    at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:293)
    at sun.reflect.GeneratedMethodAccessor435.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
    at org.apache.tools.ant.Task.perform(Task.java:348)
    at org.apache.tools.ant.taskdefs.MacroInstance.execute(MacroInstance.java:396)
    at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:293)
    at sun.reflect.GeneratedMethodAccessor435.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
    at org.apache.tools.ant.Task.perform(Task.java:348)
    at org.apache.tools.ant.Target.execute(Target.java:435)
    at org.apache.tools.ant.Target.performTasks(Target.java:456)
    at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1405)
    at org.apache.tools.ant.Project.executeTarget(Project.java:1376)
    at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
    at org.apache.tools.ant.Project.executeTargets(Project.java:1260)
    at org.apache.tools.ant.module.bridge.impl.BridgeImpl.run(BridgeImpl.java:286)
    at org.apache.tools.ant.module.run.TargetExecutor.run(TargetExecutor.java:555)
    at org.netbeans.core.execution.RunClassThread.run(RunClassThread.java:153)

在互联网上搜索后，我发现将hibernate-jpamodelgen-1.3.0.final.jar添加到类路径中可以解决问题。我添加了但结果是一样的。

我在哪里做错了？

无法按JPA搜索“条件”

0 个答案: