springboot：Hibernate配置

Question

我添加了application.properties文件，如下所示：

spring数据源（DataSourceAutoConfiguration&DataSourceProperties)Spring.DATASOURCE.url=jdbc：mysql：//localhost:3306/test？usessl=false Spring.DATASOURCE.username=root Spring.DATASOURCE.password=root

Hibernate属性SQL方言使Hibernate为所选数据库生成更好的SQL，spring.jpa.Properties.Hibernate.dialect=org.Hibernate.dialect.mysql5innoddDialect

Hibernate ddl自动（创建、创建-删除、验证、更新）spring.jpa.Hibernate.ddl-auto=创建

spring.jpa.properties.hibernate.current_session_context_class=org.springframework.orm.hibernate4.springsessioncontext

对于dao层，类：

package com.repository;

import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Repository;

@Repository
public class DaoClass
{
    @Autowired
    private SessionFactory sessionFactory;

    public SessionFactory getSessionFactory()
    {
        return sessionFactory;
    }

    @Bean
    public void setSessionFactory(SessionFactory sessionFactory)
    {
        this.sessionFactory = sessionFactory;
    }
}

现在运行springboot应用程序时，我面临以下错误：

应用程序启动失败

描述：

Com.Repository.DaoClass中得字段sessionFactory需要类型为“org.hibernate.sessionFactory”得bean,但找不到该bean.

行动：

考虑在您的配置中定义一个“org.hibernate.sessionFactory”类型的bean。

pom.xml

null

<project xmlns="http://maven.apache.org/POM/4.0.0"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>springboot</groupId>
	<artifactId>firstprogram</artifactId>
	<packaging>war</packaging>
	<version>0.0.1-SNAPSHOT</version>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.0.2.RELEASE</version>
	</parent>
	<name>firstprogram Maven Webapp</name>
	<url>http://maven.apache.org</url>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<dependency>
			<groupId>org.hibernate</groupId>
			<artifactId>hibernate-validator</artifactId>
			<version>5.3.6.Final</version>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-jpa</artifactId>			
		</dependency>

	</dependencies>
	<build>
		<finalName>firstprogram</finalName>
	</build>
</project>

null

package com.repository;

import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;

import org.springframework.stereotype.Component;

@Component
public class DaoClass
{
    @PersistenceContext
    private EntityManager entityManger;

    public EntityManager getEntityManger()
    {
        return entityManger;
    }

    public void setEntityManger(EntityManager entityManger)
    {
        this.entityManger = entityManger;
    }
}

Answer 1

spring boot不会自动配置SessionFactory，而是配置EntityManagerFactory，您可以直接使用它，也可以通过以下方式从中获取SessionFactory:

SessionFactory sessionFactory = entityManagerFactory.unwrap(SessionFactory.class);