Hibernate的显示错误，类没有映射

我创建了一个DAO类，实体和所有的Hibernate配置，但是Hibernate的不断出现同样的错误：Hibernate的显示错误，类没有映射

QuerySyntaxException: StudentEntity is not mapped [SELECT s FROM StudentEntity s]

哪里是我的错？

表脚本

CREATE TABLE student(
    id int(3) NOT NULL, 
    firstName varchar(20) NOT NULL, 
    age int(2) NOT NULL, 
    CONSTRAINT id_pk PRIMARY KEY (id) 
); 

INSERT INTO student VALUES ('101','yashik','23'); 

SELECT * FROM student;

实体类

package com.demo.entity; 
import javax.persistence.Entity; 
import javax.persistence.Id; 
import javax.persistence.Table; 

@Entity 
@Table(name="student") 
public class StudentEntity { 
    @Id 
    private int id; 
    private String firstName; 
    private int age; 
    //getter and setter

DAO类

package com.demo.dao; 
import java.util.List; 
import org.hibernate.Session; 
import org.hibernate.SessionFactory; 
import org.hibernate.query.Query; 
import com.demo.entity.StudentEntity; 
import com.demo.resources.HibernateUtility; 
public class StudentDAOImpl implements StudentDAO { 
    @Override 
    public StudentEntity getStudent(Integer studentID) { 
    SessionFactory sessionFactory=HibernateUtility.createSessionFactory(); 
    Session s1=null; 
    StudentEntity stu=null; 
    s1=sessionFactory.openSession(); 
    s1.beginTransaction(); 
    String st1="SELECT s FROM StudentEntity s"; 
    Query q1=s1.createQuery(st1); 
    List<StudentEntity> l1=q1.list(); 
    stu.setAge(l1.get(0).getAge()); 
    stu.setId(l1.get(0).getId()); 
    stu.setFirstName(l1.get(0).getFirstName()); 
    if (s1 != null) { 
     s1.close(); 
    } 
    return stu; 
    } 
}

Hibernate工具

package com.demo.resources; 

import org.hibernate.SessionFactory; 
import org.hibernate.boot.registry.StandardServiceRegistryBuilder; 
import org.hibernate.cfg.Configuration; 
import org.hibernate.service.ServiceRegistry; 

public class HibernateUtility { 

    private static final String CONFIGURATION_LOCATION="com/demo/resources/hibernate.cfg.xml"; 
    private static SessionFactory sessionFactory=getSessionFactory(); 

    public static SessionFactory getSessionFactory() { 
     if (sessionFactory == null) { 
      // loads configuration and mappings 
      Configuration configuration = new Configuration().configure(CONFIGURATION_LOCATION); 
      ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder() 
        .applySettings(configuration.getProperties()).build(); 

      // builds a session factory from the service registry 
      sessionFactory = configuration.buildSessionFactory(serviceRegistry); 
     } 

     return sessionFactory; 
    } 
    public static SessionFactory createSessionFactory(){ 
     return getSessionFactory(); 
    } 
    public static void closeSessionFactory(){ 
     if(!sessionFactory.isClosed()){ 
      sessionFactory.close(); 
     } 
    } 
}

的hibernate.cfg.xml

<?xml version="1.0" encoding="utf-8"?> 
<!DOCTYPE hibernate-configuration SYSTEM "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd"> 

<hibernate-configuration> 
    <session-factory> 
     <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property> 
     <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property> 
     <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/rmc</property> 
     <property name="hibernate.connection.username">root</property> 
     <property name="hibernate.connection.password">******</property> 
     <property name="show_sql">true</property> 
     <property name="connection.pool_size">1</property> 

     <mapping class="com.demo.entity.StudentEntity"></mapping> 
    </session-factory> 
</hibernate-configuration>

错误信息

Jul 06, 2016 10:06:18 PM org.hibernate.Version logVersion 
INFO: HHH000412: Hibernate Core {5.2.0.Final} 
Jul 06, 2016 10:06:18 PM org.hibernate.cfg.Environment <clinit> 
INFO: HHH000206: hibernate.properties not found 
Jul 06, 2016 10:06:18 PM org.hibernate.cfg.Environment buildBytecodeProvider 
INFO: HHH000021: Bytecode provider name : javassist 
Jul 06, 2016 10:06:19 PM org.hibernate.annotations.common.reflection.java.JavaReflectionManager <clinit> 
INFO: HCANN000001: Hibernate Commons Annotations {5.0.1.Final} 
Jul 06, 2016 10:06:19 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure 
WARN: HHH10001002: Using Hibernate built-in connection pool (not for production use!) 
Jul 06, 2016 10:06:19 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator 
INFO: HHH10001005: using driver [com.mysql.jdbc.Driver] at URL [jdbc:mysql://localhost:3306/rmc] 
Jul 06, 2016 10:06:19 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator 
INFO: HHH10001001: Connection properties: {user=root, password=****} 
Jul 06, 2016 10:06:19 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator 
INFO: HHH10001003: Autocommit mode: false 
Jul 06, 2016 10:06:19 PM org.hibernate.engine.jdbc.connections.internal.PooledConnections <init> 
INFO: HHH000115: Hibernate connection pool size: 1 (min=1) 
Wed Jul 06 22:06:19 IST 2016 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification. 
Jul 06, 2016 10:06:19 PM org.hibernate.dialect.Dialect <init> 
INFO: HHH000400: Using dialect: org.hibernate.dialect.MySQLDialect 
Jul 06, 2016 10:06:19 PM org.hibernate.hql.internal.QueryTranslatorFactoryInitiator initiateService 
INFO: HHH000397: Using ASTQueryTranslatorFactory 
Exception in thread "main" java.lang.IllegalArgumentException: org.hibernate.hql.internal.ast.QuerySyntaxException: StudentEntity is not mapped [SELECT s FROM StudentEntity s] 
    at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:131) 
    at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:155) 
    at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:162) 
    at org.hibernate.internal.AbstractSharedSessionContract.createQuery(AbstractSharedSessionContract.java:633) 
    at org.hibernate.internal.AbstractSharedSessionContract.createQuery(AbstractSharedSessionContract.java:101) 
    at com.demo.dao.StudentDAOImpl.getStudent(StudentDAOImpl.java:22) 
    at com.demo.userInterface.UserInterface.main(UserInterface.java:9) 
Caused by: org.hibernate.hql.internal.ast.QuerySyntaxException: StudentEntity is not mapped [SELECT s FROM StudentEntity s] 
    at org.hibernate.hql.internal.ast.QuerySyntaxException.generateQueryException(QuerySyntaxException.java:79) 
    at org.hibernate.QueryException.wrapWithQueryString(QueryException.java:103) 
    at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:218) 
    at org.hibernate.hql.internal.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:142) 
    at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:115) 
    at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:77) 
    at org.hibernate.engine.query.spi.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:152) 
    at org.hibernate.internal.AbstractSharedSessionContract.getQueryPlan(AbstractSharedSessionContract.java:523) 
    at org.hibernate.internal.AbstractSharedSessionContract.createQuery(AbstractSharedSessionContract.java:625) 
    ... 3 more 
Caused by: org.hibernate.hql.internal.ast.QuerySyntaxException: StudentEntity is not mapped 
    at org.hibernate.hql.internal.ast.util.SessionFactoryHelper.requireClassPersister(SessionFactoryHelper.java:171) 
    at org.hibernate.hql.internal.ast.tree.FromElementFactory.addFromElement(FromElementFactory.java:91) 
    at org.hibernate.hql.internal.ast.tree.FromClause.addFromElement(FromClause.java:79) 
    at org.hibernate.hql.internal.ast.HqlSqlWalker.createFromElement(HqlSqlWalker.java:321) 
    at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromElement(HqlSqlBaseWalker.java:3704) 
    at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromElementList(HqlSqlBaseWalker.java:3593) 
    at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromClause(HqlSqlBaseWalker.java:718) 
    at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.query(HqlSqlBaseWalker.java:574) 
    at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.selectStatement(HqlSqlBaseWalker.java:311) 
    at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.statement(HqlSqlBaseWalker.java:259) 
    at org.hibernate.hql.internal.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:262) 
    at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:190) 
    ... 9 more

来源

2016-07-06 Yashik

你可以更改String st1 =“SELECT s FROM StudentEntity s”; to String st1 =“FROM StudentEntity”;并尝试 –

不是这不工作，它会产生相同的错误。谢谢 – Yashik

欢迎来到Stack Overflow！我编辑了一下你的问题，把焦点放在完整的错误信息上，就在开始。所以我删除了一些介绍性文字，这些文字并没有真正帮助读者快速理解您的问题。 – trincot

String st1="SELECT s FROM StudentEntity s";

在此你想获得的所有数据在实体，如果我是正确的。

我通常使用

字符串ST1 = “从StudentEntity”;

就是这样，告诉它是否有效。

来源

2017-09-19 17:43:27

Hibernate的显示错误，类没有映射

回答

相关问题