基于Java配置Spring加Hibernate和再加SpringData时的差别

先在类路径application.properties

 jdbc.driverClassName = org.postgresql.Driver
 jdbc.url = jdbc:postgresql://localhost:5432/数据库
 jdbc.username = 用户名
 jdbc.password = 密码

 hibernate.dialect = org.hibernate.dialect.PostgreSQLDialect
 hibernate.show_sql = true
 hibernate.format_sql = true
 hibernate.hbm2ddl.auto = update  //自动更新数据库

只使用Spring+Hibernate配置

配置DataSource、LocalSessionFactoryBean、HibernateTransactionManager

import java.util.Properties;

import javax.sql.DataSource;

import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
import org.springframework.core.env.Environment;
import org.springframework.jdbc.datasource.DriverManagerDataSource;
import org.springframework.orm.hibernate5.HibernateTransactionManager;
import org.springframework.orm.hibernate5.LocalSessionFactoryBean;
import org.springframework.transaction.annotation.EnableTransactionManagement;

@Configuration
@EnableTransactionManagement
@ComponentScan({"com.websystique.springmvc.configuration"}) //配置包名
@PropertySource(value = {"classpath:application.properties"})
public class HibernateConfiguration {

    @Autowired
    private Environment environment;

    private Properties hibernateProperties() {
        Properties properties = new Properties();
        properties.put("hibernate.dialect", environment.getRequiredProperty("hibernate.dialect"));
        properties.put("hibernate.show_sql", environment.getRequiredProperty("hibernate.show_sql"));
        properties.put("hibernate.format_sql", environment.getRequiredProperty("hibernate.format_sql"));
        properties.put("hibernate.hbm2ddl.auto", environment.getRequiredProperty("hibernate.hbm2ddl.auto"));
        return properties;
    }

    @Bean
    public DataSource dataSource() {
        DriverManagerDataSource dataSource = new DriverManagerDataSource();
        dataSource.setDriverClassName(environment.getRequiredProperty("jdbc.driverClassName"));
        dataSource.setUrl(environment.getRequiredProperty("jdbc.url"));
        dataSource.setUsername(environment.getRequiredProperty("jdbc.username"));
        dataSource.setPassword(environment.getRequiredProperty("jdbc.password"));
        return dataSource;
    }

    @Bean
    public LocalSessionFactoryBean sessionFactory() {
        LocalSessionFactoryBean sessionFactory = new LocalSessionFactoryBean();
        sessionFactory.setDataSource(dataSource());
        sessionFactory.setPackagesToScan(new String[]{"com.websystique.springmvc.model"});
        sessionFactory.setHibernateProperties(hibernateProperties());
        return sessionFactory;
    }

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

使用Spring+Hibernate+SpringData配置

配置：DataSource、LocalContainerEntityManagerFactoryBean、JpaTransactionManager

 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.PropertySource;
 import org.springframework.core.annotation.Order;
 import org.springframework.core.env.Environment;
 import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
 import org.springframework.jdbc.datasource.DriverManagerDataSource;
 import org.springframework.orm.jpa.JpaTransactionManager;
 import org.springframework.orm.jpa.JpaVendorAdapter;
 import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
 import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
 import org.springframework.transaction.annotation.EnableTransactionManagement;

 import javax.sql.DataSource;
 import java.util.Properties;

 @Configuration
 @EnableTransactionManagement
 @EnableJpaRepositories({"com.example.repository"})  //持久层包名
 @PropertySource(value = {"classpath:application.properties"})
 public class HibernateConfig {

     @Autowired
     private Environment environment;

     private Properties hibernateProperties() {
         Properties properties = new Properties();
         properties.put("hibernate.dialect", environment.getRequiredProperty("hibernate.dialect"));
         properties.put("hibernate.show_sql", environment.getRequiredProperty("hibernate.show_sql"));
         properties.put("hibernate.format_sql", environment.getRequiredProperty("hibernate.format_sql"));
         properties.put("hibernate.hbm2ddl.auto",environment.getRequiredProperty("hibernate.hbm2ddl.auto"));
         return properties;
     }
     @Bean
     public DataSource dataSource() {
         DriverManagerDataSource dataSource = new DriverManagerDataSource();
         dataSource.setDriverClassName(environment.getRequiredProperty("jdbc.driverClassName"));
         dataSource.setUrl(environment.getRequiredProperty("jdbc.url"));
         dataSource.setUsername(environment.getRequiredProperty("jdbc.username"));
         dataSource.setPassword(environment.getRequiredProperty("jdbc.password"));
         return dataSource;
     }

     @Bean
     public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
         LocalContainerEntityManagerFactoryBean entityManagerFactory = new LocalContainerEntityManagerFactoryBean();
         entityManagerFactory.setDataSource(dataSource());
         entityManagerFactory.setPackagesToScan(new String[] { "com.example.model" });
         JpaVendorAdapter jpaVendorAdapter = new HibernateJpaVendorAdapter();
         entityManagerFactory.setJpaVendorAdapter(jpaVendorAdapter);
         entityManagerFactory.setJpaProperties(hibernateProperties());
         return entityManagerFactory;
     }

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

 }