我一直在一个使用 Spring mvc 4 的项目中工作,JPA 配置豆是在 java 类中创建的,没有持久性.xml就像下面的代码一样。
package test.conf;
import java.util.Properties;
import javax.persistence.EntityManagerFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
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;
@Configuration
@EnableTransactionManagement
public class JPAConfiguration {
@Bean
@Primary
public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
LocalContainerEntityManagerFactoryBean factoryBean = new LocalContainerEntityManagerFactoryBean();
JpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
factoryBean.setJpaVendorAdapter(vendorAdapter);
factoryBean.setDataSource(dataSource());
Properties props = new Properties();
props.setProperty("hibernate.dialect", "org.hibernate.dialect.MySQL5Dialect");
props.setProperty("hibernate.show_sql", "false");
props.setProperty("hibernate.hbm2ddl.auto", "update");
factoryBean.setJpaProperties(props);
String [] packages = {"test.model"};
factoryBean.setPackagesToScan(packages);
return factoryBean;
}
@Bean
@Primary
public DriverManagerDataSource dataSource() {
DriverManagerDataSource dataSource = new DriverManagerDataSource();
dataSource.setUsername("root");
dataSource.setPassword("root");
dataSource.setUrl("jdbc:mysql://localhost:3306/database");
dataSource.setDriverClassName("com.mysql.jdbc.Driver");
return dataSource;
}
@Bean
@Primary
public JpaTransactionManager transactionManager(EntityManagerFactory emf){
return new JpaTransactionManager(emf);
}
}
这工作正常,但现在,我们必须连接到第二个数据库 (ORACLE(,并且需要第二个实体管理器工厂。我该怎么做?我找到了在持久性上创建第二个持久性单元的示例.xml但我在该项目中没有持久性.xml。其他人教授如何使用 spring boot 创建与多个数据源的连接,但这不是 spring 引导项目。
我尝试为另一个数据库创建第二个 JPAConfiguration 类,然后指定一个 factoryBean.setPersistenceUnitName("(;对于每个实体管理器工厂豆,但似乎 Spring 搞砸了,因为它总是初始化一个 persiscence 单元两次。
您需要在属性中具有第二个数据源详细信息
#second db ...
spring.secondDatasource.url = [url]
spring.secondDatasource.username = [username]
spring.secondDatasource.password = [password]
spring.secondDatasource.driverClassName = oracle.jdbc.OracleDriver
然后创建您的配置类,该类将具有使用此第二个数据源的所有配置,并使用第二个数据源启用 jpa 存储库。
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(entityManagerFactoryRef = "secondEntityManagerFactory",
transactionManagerRef = "secondTransactionManager",
basePackages = {"com.server.second.repo"}
)
public class SecondDBConfiguration
@Bean("secondDatasource")
@ConfigurationProperties(prefix="spring.secondDatasource")
public DataSource secondaryDataSource() {
return DataSourceBuilder.create().build();
}
@Bean(name = "secondEntityManagerFactory")
public LocalContainerEntityManagerFactoryBean
secondEntityManagerFactory(
EntityManagerFactoryBuilder builder,
@Qualifier("secondDatasource") DataSource dataSource
) {
return
builder
.dataSource(dataSource)
.packages("com.server.shadow.domain")
.persistenceUnit("shadow")
.build();
}
@Bean(name = "secondTransactionManager")
public PlatformTransactionManager secondTransactionManager(
@Qualifier("secondEntityManagerFactory") EntityManagerFactory
secondEntityManagerFactory
) {
return new JpaTransactionManager(secondEntityManagerFactory);
}