Java Hibernate-org.Hibernate.hql.internal.ast.QuerySyntaxException:未映射产品
我在尝试对数据库进行测试查询时遇到此错误。我引用java类而不是表名,但它没有帮助。也添加了到cfg.xml的映射,但没有成功。原因可能是什么 hibernate.cfg.xmlJava Hibernate-org.Hibernate.hql.internal.ast.QuerySyntaxException:未映射产品,java,hibernate,Java,Hibernate,我在尝试对数据库进行测试查询时遇到此错误。我引用java类而不是表名,但它没有帮助。也添加了到cfg.xml的映射,但没有成功。原因可能是什么 hibernate.cfg.xml <?xml version="1.0" encoding="utf-8"?> <!DOCTYPE hibernate-configuration SYSTEM "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd"> &l
<?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/michal
</property>
<property name="hibernate.connection.username">
root
</property>
<property name="hibernate.connection.password">
root
</property>
<property name="hibernate.hbm2ddl.auto">
</property>
<!-- List of XML mapping files -->
<mapping package="regularmikey.DatabaseSingleton"/>
<mapping class="regularmikey.DatabaseSingleton.Product" />
</session-factory>
</hibernate-configuration>
DBSession.java
package regularmikey.DatabaseSingleton;
import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
public class DBSession {
private static DBSession dbSession = null;
private SessionFactory sessionFactory = null;
private DBSession(){
Configuration configuration = new Configuration().configure();
ServiceRegistry serviceRegistry
= new StandardServiceRegistryBuilder()
.applySettings(configuration.getProperties()).build();
sessionFactory = (configuration.buildSessionFactory(serviceRegistry));
};
public static DBSession getInstance()
{
if(dbSession == null) {
dbSession = new DBSession();
}
return dbSession;
}
public SessionFactory getSessionFactory() {
return sessionFactory;
}
}
App.java
package regularmikey.DatabaseSingleton;
import java.util.Iterator;
import java.util.List;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.Transaction;
public class App
{
public static void main( String[] args )
{
DBSession dbFactory = DBSession.getInstance();
Session session = dbFactory.getSessionFactory().openSession();
Transaction tx = null;
try{
tx = session.beginTransaction();
List products = session.createQuery("FROM Product").list();
for (Iterator iterator =
products.iterator(); iterator.hasNext();){
Product product = (Product) iterator.next();
System.out.print("Name: " + product.getName());
System.out.print("Alloy: " + product.getAlloy());
System.out.println("Weight: " + product.getWeight());
}
tx.commit();
}catch (HibernateException e) {
if (tx!=null) tx.rollback();
e.printStackTrace();
}finally {
session.close();
}
}
}
将其添加到您的
hibernate.cfg.xml
-true
中,并检查日志记录,如您的schema generator属性设置不正确。请将您的hibernate.hbm2ddl.auto
更改为以下create
,并返回问题是否已解决。@Bonifacio可惜没有帮助
package regularmikey.DatabaseSingleton;
import java.util.Iterator;
import java.util.List;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.Transaction;
public class App
{
public static void main( String[] args )
{
DBSession dbFactory = DBSession.getInstance();
Session session = dbFactory.getSessionFactory().openSession();
Transaction tx = null;
try{
tx = session.beginTransaction();
List products = session.createQuery("FROM Product").list();
for (Iterator iterator =
products.iterator(); iterator.hasNext();){
Product product = (Product) iterator.next();
System.out.print("Name: " + product.getName());
System.out.print("Alloy: " + product.getAlloy());
System.out.println("Weight: " + product.getWeight());
}
tx.commit();
}catch (HibernateException e) {
if (tx!=null) tx.rollback();
e.printStackTrace();
}finally {
session.close();
}
}
}