通過配置類創建transactionmanager和實體管理器

Question

我對spring比較新，想用mysql實現spring jpa。下面提到的是我的配置...

<beans ... 
<context:component-scan base-package="com.pg" /> 

<mvc:annotation-driven /> 

<tx:annotation-driven/> 

<aop:aspectj-autoproxy /> 

<jpa:repositories base-package="com.pg.dao" /> ... 

我的配置類創建數據源，transactionmanager和entitymanager下面列出。

package com.pg.conf; 

import java.util.Properties; 

import javax.persistence.EntityManagerFactory; 
import javax.sql.DataSource; 
import javax.transaction.TransactionManager; 

import org.apache.tomcat.dbcp.dbcp.BasicDataSource; 
import org.springframework.beans.factory.FactoryBean; 
import org.springframework.context.annotation.Bean; 
import org.springframework.context.annotation.Configuration; 
import org.springframework.orm.jpa.JpaTransactionManager; 
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean; 
import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter; 

@Configuration 
public class JPAConfiguration { 

    @Bean 
    public DataSource dataSource(){ 
     BasicDataSource datasource = new BasicDataSource(); 
     datasource.setDriverClassName(com.mysql.jdbc.Driver.class.getName()); 
     datasource.setUrl("jdbc:mydql://localhost:3306/pg1"); 
     datasource.setUsername("root"); 
     datasource.setPassword("root"); 
     return datasource; 
    } 

    @Bean 
    public **FactoryBean<EntityManagerFactory>** entityManagerFactory(){ 
     LocalContainerEntityManagerFactoryBean containerEntityManagerFactoryBean = new LocalContainerEntityManagerFactoryBean(); 
     containerEntityManagerFactoryBean.setDataSource(dataSource()); 
     HibernateJpaVendorAdapter adaptor = new HibernateJpaVendorAdapter(); 
     containerEntityManagerFactoryBean.setJpaVendorAdapter(adaptor); 
     containerEntityManagerFactoryBean.setPackagesToScan("com.pg.entity"); 
     Properties props = new Properties();   
     props.setProperty("hibernate.dialect", "org.hibernate.dialect.MySQLDialect"); 
     props.setProperty("hibernate.show_sql", "true"); 
     containerEntityManagerFactoryBean.setJpaProperties(props); 
     return containerEntityManagerFactoryBean; 
    } 

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

} 

我有上線jpaTransactionManager.setEntityManagerFactory誤差（的entityManagerFactory（））;

我認爲EntityManager的方法的返回類型是不正確的......即使它沒有顯示錯誤....

任何幫助表示讚賞。

Answer 1

從閱讀Spring參考指南開始閱讀有關FactoryBeans。

然後相應地更改您的代碼。

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