java文件中的hibernate.cfg.xml替代方案

Question

我正在使用 spring 框架和数据库我使用 hibernate.cfg.xml 以下方式

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
    "-//Hibernate/Hibernate Configuration DTD//EN"
    "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory>
        <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
        <property name="show_sql">false</property> 
        <property name="hbm2ddl.auto">update</property>
        <mapping class="com.lynas.test.Student" />
    </session-factory>
</hibernate-configuration>

现在有什么方法可以在java文件中编写这段代码。 像豆子什么的？？

Answer 1

答案是肯定的。 来自http://java.dzone.com/articles/springhibernate-application

package com.sivalabs.springmvc.config;

import java.util.HashMap;
import java.util.Map;
import java.util.Properties;

import javax.sql.DataSource;

import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.jdbc.datasource.DriverManagerDataSource;
import org.springframework.orm.hibernate3.HibernateTemplate;
import org.springframework.orm.hibernate3.HibernateTransactionManager;
import org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean;
import org.springframework.orm.hibernate3.support.IdTransferringMergeEventListener;
import org.springframework.transaction.annotation.AnnotationTransactionAttributeSource;
import org.springframework.transaction.interceptor.TransactionAttributeSource;
import org.springframework.transaction.interceptor.TransactionInterceptor;

/**
 * @author SivaLabs
 *
 */
@Configuration
public class RepositoryConfig
{
    //${jdbc.driverClassName}
    @Value("${jdbc.driverClassName}")     private String driverClassName;
    @Value("${jdbc.url}")                 private String url;
    @Value("${jdbc.username}")             private String username;
    @Value("${jdbc.password}")             private String password;

    @Value("${hibernate.dialect}")         private String hibernateDialect;
    @Value("${hibernate.show_sql}")     private String hibernateShowSql;
    @Value("${hibernate.hbm2ddl.auto}") private String hibernateHbm2ddlAuto;

    @Bean()    
    public DataSource getDataSource()
    {
        DriverManagerDataSource ds = new DriverManagerDataSource();        
        ds.setDriverClassName(driverClassName);
        ds.setUrl(url);
        ds.setUsername(username);
        ds.setPassword(password);        
        return ds;
    }

    @Bean
    @Autowired
    public HibernateTransactionManager transactionManager(SessionFactory sessionFactory)
    {
        HibernateTransactionManager htm = new HibernateTransactionManager();
        htm.setSessionFactory(sessionFactory);
        return htm;
    }

    @Bean
    @Autowired
    public HibernateTemplate getHibernateTemplate(SessionFactory sessionFactory)
    {
        HibernateTemplate hibernateTemplate = new HibernateTemplate(sessionFactory);
        return hibernateTemplate;
    }

    @Bean
    public AnnotationSessionFactoryBean getSessionFactory()
    {
        AnnotationSessionFactoryBean asfb = new AnnotationSessionFactoryBean();
        asfb.setDataSource(getDataSource());
        asfb.setHibernateProperties(getHibernateProperties());        
        asfb.setPackagesToScan(new String[]{"com.sivalabs"});
        return asfb;
    }

    @Bean
    public Properties getHibernateProperties()
    {
        Properties properties = new Properties();
        properties.put("hibernate.dialect", hibernateDialect);
        properties.put("hibernate.show_sql", hibernateShowSql);
        properties.put("hibernate.hbm2ddl.auto", hibernateHbm2ddlAuto);

        return properties;
    }

}

Answer 2

不，上面的数据库配置不能移动到 java 文件，但可以移动到调度服务器。实际上，从 spring 2.5 版本开始，不需要整个 hibernate.cfg.xml。 您可以像这样在调度程序 servlet 中设置休眠属性。 以下代码使用 mysql 方言，因此将其替换为您的要求，同时替换数据库的名称、数据库的用户名和密码。

 <?xml version="1.0" encoding="UTF-8" ?> 
 <beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:jee="http://www.springframework.org/schema/jee" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.1.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.1.xsd">
  <context:component-scan base-package="com.c.controllers" /> 
  <context:component-scan base-package="com.c.service" /> 
  <context:component-scan base-package="com.c.dao" /> 
  <mvc:annotation-driven /> 

 <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
  <property name="prefix" value="/WEB-INF/jsp/" /> 
  <property name="suffix" value=".jsp" /> 
  </bean>
 <bean id="myDataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
 <property name="driverClassName">
  <value>com.mysql.jdbc.Driver</value> 
  </property>
 <property name="url">
  <value>jdbc:mysql://localhost:3306/"your database name"</value> 
  </property>
 <property name="username">
  <value>"insert username here"</value> 
  </property>
 <property name="password">
  <value>"insert password here"</value> 
  </property>
  </bean>
 <bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
 <property name="dataSource">
  <ref bean="myDataSource" /> 
  </property>
 <property name="annotatedClasses">
 <list>
  <value>com.c.beans.Employee</value> 
  </list>
  </property>
 <property name="hibernateProperties">
 <props>
  <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop> 
  <prop key="hibernate.show_sql">true</prop> 
  <prop key="hibernate.format_sql">true</prop> 
  </props>
  </property>
  </bean>
 <bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">
  <property name="sessionFactory" ref="sessionFactory" /> 
  </bean>
  <tx:annotation-driven transaction-manager="transactionManager" /> 
  </beans>

Answer 3

一个更现代、更有效的解决方案：

@Configuration
@ComponentScan(basePackageClasses = {массив пакетов с классами @Component, @Service, @Repository, @Controller})
@EnableTransactionManagement
@EnableJpaRepositories(basePackages = "com.jdev.blog.admin.crud.repositories", entityManagerFactoryRef = "entityManagerFactory")
public class ApplicationConfiguration { 
   @Bean
    public DataSource dataSource() {
        DriverManagerDataSource dataSource = new DriverManagerDataSource();

        dataSource.setDriverClassName(env.getRequiredProperty(PROPERTY_NAME_DATABASE_DRIVER));
        dataSource.setUrl(env.getRequiredProperty(PROPERTY_NAME_DATABASE_URL));
        dataSource.setUsername(env.getRequiredProperty(PROPERTY_NAME_DATABASE_USERNAME));
        dataSource.setPassword(env.getRequiredProperty(PROPERTY_NAME_DATABASE_PASSWORD));

        return dataSource;
    }

    @Bean
    public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
        LocalContainerEntityManagerFactoryBean entityManagerFactoryBean = new LocalContainerEntityManagerFactoryBean();
        entityManagerFactoryBean.setDataSource(dataSource());
        entityManagerFactoryBean.setPersistenceProviderClass(HibernatePersistenceProvider.class);

        entityManagerFactoryBean.setJpaProperties(hibProperties());

        return entityManagerFactoryBean;
    }

    private Properties hibProperties() {
        Properties properties = new Properties();
        properties.put(PROPERTY_NAME_HIBERNATE_DIALECT, env.getRequiredProperty(PROPERTY_NAME_HIBERNATE_DIALECT));
        properties.put(PROPERTY_NAME_HIBERNATE_SHOW_SQL, env.getRequiredProperty(PROPERTY_NAME_HIBERNATE_SHOW_SQL));
        return properties;
    }

    @Bean
    public JpaTransactionManager transactionManager() {
        JpaTransactionManager transactionManager = new JpaTransactionManager();
        transactionManager.setEntityManagerFactory(entityManagerFactory().getObject());
        return transactionManager;
    }
}