java - 为什么 Hibernate 每次请求都创建新的数据库连接？

Question

我有 Java - Spring Boot - Hibernate - Postgres 应用程序。 hibernate 每次请求都会创建数据库连接，为什么？有可配置的吗？例如，一个 session 持续 10 分钟？

我的 hibernate 配置:

@Autowired
private Environment environment;

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

@Bean
public DataSource dataSource() {
    DriverManagerDataSource dataSource = new DriverManagerDataSource();
    dataSource.setDriverClassName("org.postgresql.Driver");
    dataSource.setUrl(environment.getRequiredProperty("spring.datasource.url"));
    dataSource.setUsername(environment.getRequiredProperty("spring.datasource.username"));
    dataSource.setPassword(environment.getRequiredProperty("spring.datasource.password"));
    return dataSource;
}

private Properties hibernateProperties() {
    Properties properties = new Properties();
    properties.put("hibernate.dialect", environment.getRequiredProperty("spring.jpa.properties.hibernate.dialect"));
    properties.put("hibernate.show_sql", environment.getRequiredProperty("spring.jpa.hibernate.show-sql"));
    properties.put("hibernate.format_sql", "false");
    properties.put("hibernate.jdbc.lob.non_contextual_creation", "true");
    return properties;
}

我收到的每个请求都遵循日志:

11:19:13.584 [http-nio-8080-exec-2] DEBUG o.s.j.d.DriverManagerDataSource - 创建新的 JDBC DriverManager 连接到 [jdbc:postgresql://localhost:5432/monit]

为什么？我该如何更改它？

Answer 1

由于定义了数据源，因此需要手动配置连接池。 来自 Spring official documentation :

If you define your own DataSource bean, auto-configuration does not occur.

从spring boot 2开始，HikariCP是内嵌spring boot starter(spring-boot-starter-jdbc和spring-boot- starter-data-jpa).

您可以使用 HikariCP

使用以下配置来配置最大池大小

spring.datasource.hikari.maximum-pool-size= 10