休眠和 MySQL 配置

Question

我花了几个小时尝试设置我的第一个 Hibernate 应用程序，但它仍然无法运行。

我有 WAMP 服务器和我的 MySQL 数据库，名为 "hibernatetest"。我在 Eclipse 中有项目，其中包含 Hibernate 库和 mysql-connector-java-5.1.18-bin.jar。我也有这个类:

HibernateUtil.java:

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

public class HibernateUtil {

    private static final SessionFactory sessionFactory = buildSessionFactory();

    private static SessionFactory buildSessionFactory() {
        try {
            // Create the SessionFactory from hibernate.cfg.xml
            return new Configuration().configure().buildSessionFactory(
                new StandardServiceRegistryBuilder().build() );
        }
        catch (Throwable ex) {
            // Make sure you log the exception, as it might be swallowed
            System.err.println("Initial SessionFactory creation failed." + ex);
            throw new ExceptionInInitializerError(ex);
        }
    }

    public static SessionFactory getSessionFactory() {
        return sessionFactory;
    }

}

test.java（包含主要内容）：

import org.hibernate.Session;

import templates.Album;

public class test {
    public static void main(String[] args){
        Album i = new Album();
        i.setID(1);
        i.setArtist("Iron Maiden");
        i.setTitle("The Book of Souls");
        i.setLabel("Warner Music");

        Session session = HibernateUtil.getSessionFactory().getCurrentSession();
        session.beginTransaction();

        session.save(i);

        session.getTransaction().commit();
        session.close();
        System.out.println("Saved");
    }
}

Album.java:

package templates;

public class Album {
    private int ID;
    private String title;
    private String artist;
    private String label;

    public Album(){

    }

    public int getID() {
        return ID;
    }

    public void setID(int iD) {
        ID = iD;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getArtist() {
        return artist;
    }

    public void setArtist(String artist) {
        this.artist = artist;
    }

    public String getLabel() {
        return label;
    }

    public void setLabel(String label) {
        this.label = label;
    }

}

Album.hbm.xml: link

Hibernate.cfg.xml: link

堆栈跟踪：

wrz 15, 2015 10:04:47 PM org.hibernate.Version logVersion
INFO: HHH000412: Hibernate Core {5.0.1.Final}
wrz 15, 2015 10:04:47 PM org.hibernate.cfg.Environment <clinit>
INFO: HHH000206: hibernate.properties not found
wrz 15, 2015 10:04:47 PM org.hibernate.cfg.Environment buildBytecodeProvider
INFO: HHH000021: Bytecode provider name : javassist
wrz 15, 2015 10:04:47 PM org.hibernate.boot.jaxb.internal.stax.LocalXmlResourceResolver resolveEntity
WARN: HHH90000012: Recognized obsolete hibernate namespace http://hibernate.sourceforge.net/hibernate-configuration. Use namespace http://www.hibernate.org/dtd/hibernate-configuration instead.  Support for obsolete DTD/XSD namespaces may be removed at any time.
wrz 15, 2015 10:04:48 PM org.hibernate.annotations.common.reflection.java.JavaReflectionManager <clinit>
INFO: HCANN000001: Hibernate Commons Annotations {5.0.0.Final}
wrz 15, 2015 10:04:49 PM org.hibernate.engine.jdbc.connections.internal.ConnectionProviderInitiator initiateService
WARN: HHH000181: No appropriate connection provider encountered, assuming application will be supplying connections
wrz 15, 2015 10:04:49 PM org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator initiateService
WARN: HHH000342: Could not obtain connection to query metadata : The application must supply JDBC connections
Initial SessionFactory creation failed.org.hibernate.service.spi.ServiceException: Unable to create requested service [org.hibernate.engine.jdbc.env.spi.JdbcEnvironment]
Exception in thread "main" java.lang.ExceptionInInitializerError
    at HibernateUtil.buildSessionFactory(HibernateUtil.java:18)
    at HibernateUtil.<clinit>(HibernateUtil.java:7)
    at test.main(test.java:13)
Caused by: org.hibernate.service.spi.ServiceException: Unable to create requested service [org.hibernate.engine.jdbc.env.spi.JdbcEnvironment]
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:244)
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:208)
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:189)
    at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:51)
    at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:94)
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:217)
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:189)
    at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.handleTypes(MetadataBuildingProcess.java:352)
    at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:111)
    at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.build(MetadataBuildingProcess.java:83)
    at org.hibernate.boot.internal.MetadataBuilderImpl.build(MetadataBuilderImpl.java:418)
    at org.hibernate.boot.internal.MetadataBuilderImpl.build(MetadataBuilderImpl.java:87)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:692)
    at HibernateUtil.buildSessionFactory(HibernateUtil.java:12)
    ... 2 more
Caused by: org.hibernate.HibernateException: Access to DialectResolutionInfo cannot be null when 'hibernate.dialect' not set
    at org.hibernate.engine.jdbc.dialect.internal.DialectFactoryImpl.determineDialect(DialectFactoryImpl.java:100)
    at org.hibernate.engine.jdbc.dialect.internal.DialectFactoryImpl.buildDialect(DialectFactoryImpl.java:54)
    at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:137)
    at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:35)
    at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.initiateService(StandardServiceRegistryImpl.java:88)
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:234)
    ... 15 more

我做错了什么？

Answer 1

如错误所述，您需要在 hibernate.cfg 文件中指定方言。

<property name="dialect">org.hibernate.dialect.MySQLDialect</property>

Answer 2

我注意到一些可能导致问题的原因：

1) 在您的 hibernate.cfg.xml 中，您没有指定连接密码。您可以通过添加 <property name="connection.password">your_Pass_here</property> 属性（或者出于隐私原因省略它？）

来实现

2) 正如@Prerak Tiwari 提到的，您没有指定方言。按照他提到的 <property name="dialect">org.hibernate.dialect.MySQLDialect</property> 属性

3) 我注意到您的属性名称与大多数人使用的名称不同。不要添加 ...name="hibernate.connection.driver_class"... 省略 hibernate. 部分，所以它应该如下所示：

<session-factory>
    <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
    <property name="connection.url">jdbc:mysql://localhost/hibernatetest</property>
    <property name="connection.username">root</property>
    Your password property here...
    <property name="dialect">org.hibernate.dialect.MySQLDialect</property>

    <mapping resource="/templates/Album.hbm.xml"/>
</session-factory>

希望其中一些对你有用:)

Answer 3

这就是我修复错误的方法。

我的环境和你的一样Hibernate 5+, Mysql & WAMP Server

确保包含 jta jar，它包含在此位置 \hibernate-release-5.0.5.Final\lib\osgi

您应该添加新用户并授予所有权限。主机应该是 localhost

你的 hibernate.cfg.xml 应该是这样的

这就是它对我有用的方式。我想我必须给 localhost 而不是 %

Answer 4

我遇到了同样的问题。只需在 localhost 之后添加您的端口号。在我的例子中它是 localhost:3306

<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/your_db</property>

Answer 5

检查密码是否正确 hibernate.cfg.xml

<property name="connection.password">root</property>

休眠和 MySQL 配置

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