java – 使用相同存储库和模型类的多个数据源的Spring Boot？

我必须做一个Spring Boot 1.5版应用程序,它可以这样做：它创建一个对象并尝试持久化到两个数据源(例如：2个数据库名为：test_book_1和Postgresql中的test_book_2).

我找到了一个可以用于2个不同对象的例子(作者：A,书籍：B),它们可以存储在不同的数据库中(A转到test_book_1,B转到test_book_2).这是一个很好的例子,但它不是我想要的.
Store separate objects to different data sources

我认为我需要定义2个自定义JPA DatabaseConfigurations,并需要将它们配置为管理相同的存储库和域类.但是,Spring只使用第二个类作为限定符来注入JPA存储库(我知道当两个配置指向同一个类时,第二个类可以覆盖).

问题是,我怎么能告诉Spring让它知道什么时候应该从想要的数据源中注入正确的Bean(BookRepository)(我想将对象持久保存到两个数据源,而不仅仅是第二个数据源).

以下是上面示例链接中的修改代码.

一个application.properties文件,它被修改为在Postgresql中创建2个数据库,而不是在Postgresql中创建1个,在Mysql中创建1个.

server.port=8082
# -----------------------
# POSTGRESQL DATABASE CONFIGURATION
# -----------------------
    spring.postgresql.datasource.url=jdbc:postgresql://localhost:5432/test_book_db
spring.postgresql.datasource.username=petauser
spring.postgresql.datasource.password=petapasswd
spring.postgresql.datasource.driver-class-name=org.postgresql.Driver

# ------------------------------
# POSTGRESQL 1 DATABASE CONFIGURATION
# ------------------------------

   spring.mysql.datasource.url=jdbc:postgresql://localhost:5432/test_author_db
spring.mysql.datasource.username=petauser
spring.mysql.datasource.password=petapasswd
spring.mysql.datasource.driver-class-name=org.postgresql.Driver

包：com.roufid.tutorial.configuration
class APostgresqlConfiguration

package com.roufid.tutorial.configuration;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
import java.util.stream.Collectors;

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

import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.autoconfigure.jdbc.DataSourceBuilder;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.orm.jpa.EntityManagerFactoryBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PropertiesLoaderUtils;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.orm.jpa.JpaTransactionManager;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;

import com.roufid.tutorial.entity.postgresql.Book;

/**
 * Spring configuration of the "PostgreSQL" database.
 *
 * @author Radouane ROUFID.
 *
 */
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
        entityManagerFactoryRef = "postgresqlEntityManager",transactionManagerRef = "postgresqlTransactionManager",basePackages = "com.roufid.tutorial.dao.postgresql"
)
public class APostgresqlConfiguration {

    /**
     * PostgreSQL datasource definition.
     *
     * @return datasource.
     */
    @Bean
    @Primary
    @ConfigurationProperties(prefix = "spring.postgresql.datasource")
    public DataSource postgresqlDataSource() {
        return DataSourceBuilder
                .create()
                .build();
    }

    /**
     * Entity manager definition.
     *
     * @param builder an EntityManagerFactoryBuilder.
     * @return LocalContainerEntityManagerFactoryBean.
     */
    @Primary
    @Bean(name = "postgresqlEntityManager")
    public LocalContainerEntityManagerFactoryBean postgresqlEntityManagerFactory(EntityManagerFactoryBuilder builder) {
        return builder
                .dataSource(postgresqlDataSource())
                .properties(hibernateProperties())
                .packages(Book.class)
                .persistenceUnit("postgresqlPU")
                .build();
    }

    @Primary
    @Bean(name = "postgresqlTransactionManager")
    public PlatformTransactionManager postgresqlTransactionManager(@Qualifier("postgresqlEntityManager") EntityManagerFactory entityManagerFactory) {
        return new JpaTransactionManager(entityManagerFactory);
    }

    private Map

package com.roufid.tutorial.configuration;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
import java.util.stream.Collectors;

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

import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.autoconfigure.jdbc.DataSourceBuilder;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.orm.jpa.EntityManagerFactoryBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PropertiesLoaderUtils;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.orm.jpa.JpaTransactionManager;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;

import com.roufid.tutorial.entity.mysql.Author;
import com.roufid.tutorial.entity.postgresql.Book;

/**
 * Spring configuration of the "mysql" database.
 *
 * @author Radouane ROUFID.
 *
 */
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
        entityManagerFactoryRef = "mysqlEntityManager",transactionManagerRef = "mysqlTransactionManager",basePackages = "com.roufid.tutorial.dao.postgresql"
)
public class MysqlConfiguration {

    /**
     * MySQL datasource definition.
     *
     * @return datasource.
     */
    @Bean
    @ConfigurationProperties(prefix = "spring.mysql.datasource")
    public DataSource mysqlDataSource() {
        return DataSourceBuilder
                .create()
                .build();
    }

    /**
     * Entity manager definition.
     *
     * @param builder an EntityManagerFactoryBuilder.
     * @return LocalContainerEntityManagerFactoryBean.
     */
    @Bean(name = "mysqlEntityManager")
    public LocalContainerEntityManagerFactoryBean mysqlEntityManagerFactory(EntityManagerFactoryBuilder builder) {
        return builder
                .dataSource(mysqlDataSource())
                .properties(hibernateProperties())
                .packages(Book.class)
                .persistenceUnit("mysqlPU")
                .build();
    }

    /**
     * @param entityManagerFactory
     * @return
     */
    @Bean(name = "mysqlTransactionManager")
    public PlatformTransactionManager mysqlTransactionManager(@Qualifier("mysqlEntityManager") EntityManagerFactory entityManagerFactory) {
        return new JpaTransactionManager(entityManagerFactory);
    }

    private Map

package com.roufid.tutorial.dao.postgresql;

import org.springframework.data.repository.CrudRepository;

import com.roufid.tutorial.entity.postgresql.Book;

/**
 * Book repository.
 * 
 * @author Radouane ROUFID.
 *
 */
public interface BookRepository extends CrudRepository

package com.roufid.tutorial.entity.postgresql;

import java.io.Serializable;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name = "BOOK")
public class Book implements Serializable {

    private static final long serialVersionUID = -9019470250770543773L;

    @Id
    private Long id;

    @Column
    private String name;

    @Column
    private Long authorId;

    ...
    // Setters,Getters

}

@RunWith(SpringRunner.class)
@SpringBootTest
public class ApplicationTest {
@Autowired
private BookRepository bookRepository;
@Before
public void init() {   
    Book book = new Book();
    book.setId(bookId);
    book.setName("Spring Boot Book");

    // How can it persist to the first datasource?  
    bookRepository.save(book);
}