不使用XML配置JPA

不使用XML配置JPA

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不使用XML配置JPA / Hibernate / PostgreSQL

本文介绍了不使用XML配置JPA / Hibernate / PostgreSQL的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我重新回到了Java世界，我试图用JPA，Hibernate和PostgreSQL配置一个新的Spring web应用程序。



我找到了很多具有各种XML配置文件的旧例子，我想知道是否有一种首选的新方法来执行此配置而不依赖于XML文件创作。



有些我需要配置的东西是hibernate的sql语言，驱动程序等。 解决方案

将以下片段放入注释类使用 @Configuration 和 @EnableTransactionManagement



Hibernate / JPA （编辑packagesToScan字符串）： 

  @Bean 
 LocalContainerEntityManagerFactoryBean entityManagerFactory（）{
 LocalContainerEntityManagerFactoryBean em =新的LocalContainerEntityManagerFactoryBean（）; 
 em.setDataSource（dataSource（））; 
 em.setPackagesToScan（new String [] {com.XY.model}）; 
 JpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter（）; 
 em.setJpaVendorAdapter（vendorAdapter）; 
 em.setJpaProperties（additionalProperties（））; 
返回em; 
 
 
属性additionalProperties（）{
属性properties = new Properties（）; 
 properties.setProperty（hibernate.hbm2ddl.auto，update）; 
 properties.setProperty（hibernate.dialect，org.hibernate.dialect.PostgreSQL9Dialect）; 
 properties.setProperty（hibernate.show_sql，true）; 
返回属性; 
 
 $ / code>

数据源（编辑用户名，密码和主机地址）：

  @Bean 
 public DataSource dataSource（）{
 DriverManagerDataSource dataSource = new DriverManagerDataSource（）; 
 dataSource.setDriverClassName（org.postgresql.Driver）; 
 dataSource.setUrl（jdbc：postgresql：// localhost：port / DB_NAME）; 
 dataSource.setUsername（root）; 
 dataSource.setPassword（）; 
返回dataSource; 
 
 
 
 $ b $ p 
 
 
 $ b 
 pre>  @Bean 
 public PlatformTransactionManager transactionManager（EntityManagerFactory emf）{
 JpaTransactionManager transactionManager = new JpaTransactionManager（）; 
 transactionManager.setEntityManagerFactory（emf）; 
返回transactionManager; 
}


I'm getting back into the Java world, and I'm trying to configure a new Spring web application with JPA, Hibernate and PostgreSQL.

I have found a lot of older examples with various XML configuration files, and I'm wondering if there is a preferred new way to perform this configuration without relying on XML file authoring.

Some of the things I need to configure are the hibernate sql dialect, driver, etc.

解决方案

Put the following fragments into a class annotated with @Configuration and @EnableTransactionManagement

Hibernate/JPA (edit the packagesToScan String):

@Bean
public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
    LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
    em.setDataSource(dataSource());
    em.setPackagesToScan(new String[] { "com.XY.model" });
    JpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
    em.setJpaVendorAdapter(vendorAdapter);
    em.setJpaProperties(additionalProperties());
    return em;
}

Properties additionalProperties() {
    Properties properties = new Properties();
    properties.setProperty("hibernate.hbm2ddl.auto", "update");
    properties.setProperty("hibernate.dialect", "org.hibernate.dialect.PostgreSQL9Dialect");
    properties.setProperty("hibernate.show_sql", "true");
    return properties;
}

DataSource (edit username, password and host address):

@Bean
public DataSource dataSource() {
    DriverManagerDataSource dataSource = new DriverManagerDataSource();
    dataSource.setDriverClassName("org.postgresql.Driver");
    dataSource.setUrl("jdbc:postgresql://localhost:port/DB_NAME");
    dataSource.setUsername("root");
    dataSource.setPassword("");
    return dataSource;
}

Transaction Manager:

@Bean
public PlatformTransactionManager transactionManager(EntityManagerFactory emf) {
    JpaTransactionManager transactionManager = new JpaTransactionManager();
    transactionManager.setEntityManagerFactory(emf);
    return transactionManager;
}

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08-13 08:34
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