多数据源配置Jpa(十六)下-阿里云开发者社区

二.五数据多数据源配置

主要配置数据源 DataSource 和关于扫描库，扫描实体。

二.五.一 DataSource 数据源配置

package top.yueshushu.learn.config;
import com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceBuilder;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Primary;
import org.springframework.stereotype.Component;
import javax.sql.DataSource;
/**
 * @ClassName:DataSourceConfig
 * @Description 数据库源的配置
 * @Author zk_yjl
 * @Date 2021/9/2 10:42
 * @Version 1.0
 * @Since 1.0
 **/
@Component
public class DataSourceConfig {
    /**
     * 创建 springboot 的数据库的数据源 DataSource
     * @return
     */
    @Bean("dataSourceOne")
    @ConfigurationProperties("spring.datasource.one")
    @Primary  //通过注解 @Primary 表明默认的库
    public DataSource dataSourceOne(){
        return DruidDataSourceBuilder.create().build();
    }
    /**
     * 创建 springboot2 的数据库的数据源 DataSource
     * @return
     */
    @Bean("dataSourceTwo")
    @ConfigurationProperties("spring.datasource.two")
    public DataSource dataSourceTwo(){
        return DruidDataSourceBuilder.create().build();
    }
}

在 dataSourceOne() 方法上，多添加了一个注解 @Primary ,指定默认的库。默认库为 springboot

二.五.二配置扫描库和扫描实体

二.五.二.一配置主库 dataSourceOne 数据源

package top.yueshushu.learn.config;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.orm.jpa.JpaProperties;
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.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 javax.annotation.Resource;
import javax.persistence.EntityManager;
import javax.sql.DataSource;
/**
 * @ClassName:JpaOneConfig
 * @Description 数据库 springboot的Jpa 主库 配置信息
 * @Author zk_yjl
 * @Date 2021/9/6 18:00
 * @Version 1.0
 * @Since 1.0
 **/
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
        basePackages = "top.yueshushu.learn.repository.one", // 指定扫描仓库的位置
        entityManagerFactoryRef = "localContainerEntityManagerFactoryBeanOne", //指定扫描实体的位置
        transactionManagerRef = "platformTransactionManagerOne") //指定事务
public class JpaOneConfig {
    @Resource(name="dataSourceOne")
    DataSource dataSourceOne;
    @Autowired
    JpaProperties jpaProperties;
    @Primary  //配置默认
    @Bean(name = "entityManagerPrimaryOne")
    public EntityManager entityManagerOne(EntityManagerFactoryBuilder builder) {
        return localContainerEntityManagerFactoryBeanOne(builder).getObject().createEntityManager();
    }
    @Bean
    @Primary //配置默认
    LocalContainerEntityManagerFactoryBean localContainerEntityManagerFactoryBeanOne(EntityManagerFactoryBuilder builder) {
        return builder.dataSource(dataSourceOne)
                // 设置实体的包
                .packages("top.yueshushu.learn.pojo.one")
                //设置配置信息
                .properties(jpaProperties.getProperties())
                //设置持久化的名称
                .persistenceUnit("onePersistenceUnit")
                .build();
    }
    @Bean
    @Primary  //配置默认
    PlatformTransactionManager platformTransactionManagerOne(EntityManagerFactoryBuilder builder) {
        LocalContainerEntityManagerFactoryBean factoryBeanOne = localContainerEntityManagerFactoryBeanOne(builder);
        return new JpaTransactionManager(factoryBeanOne.getObject());
    }
}

二.五.二.二配置从库 dataSourceOne 数据源

package top.yueshushu.learn.config;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.orm.jpa.JpaProperties;
import org.springframework.boot.orm.jpa.EntityManagerFactoryBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
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 javax.annotation.Resource;
import javax.persistence.EntityManager;
import javax.sql.DataSource;
/**
 * @ClassName:JpaOneConfig
 * @Description 数据库 springboot的Jpa配置信息
 * @Author zk_yjl
 * @Date 2021/9/6 18:00
 * @Version 1.0
 * @Since 1.0
 **/
@Configuration
@EnableJpaRepositories(basePackages = "top.yueshushu.learn.repository.two", // 指定扫描仓库的位置
        entityManagerFactoryRef ="localContainerEntityManagerFactoryBeanTwo",  //指定扫描实体的位置
        transactionManagerRef = "platformTransactionManagerTwo") //指定事务
@EnableTransactionManagement
public class JpaTwoConfig {
    @Resource(name="dataSourceTwo")
    DataSource dataSourceTwo;
    @Autowired
    JpaProperties jpaProperties;
    @Bean(name = "entityManagerTwo")
    public EntityManager entityManager(EntityManagerFactoryBuilder builder) {
        return localContainerEntityManagerFactoryBeanTwo(builder).getObject().createEntityManager();
    }
    @Bean
    LocalContainerEntityManagerFactoryBean localContainerEntityManagerFactoryBeanTwo(EntityManagerFactoryBuilder builder) {
        return builder.dataSource(dataSourceTwo)
                .packages("top.yueshushu.learn.pojo.two")
                .properties(jpaProperties.getProperties())
                //设置持久化的名称
                .persistenceUnit("twoPersistenceUnit")
                .build();
    }
    @Bean
    PlatformTransactionManager platformTransactionManagerTwo(EntityManagerFactoryBuilder builder) {
        LocalContainerEntityManagerFactoryBean factoryBeanTwo = localContainerEntityManagerFactoryBeanTwo(builder);
        return new JpaTransactionManager(factoryBeanTwo.getObject());
    }
}

二.六接口及其实现

UserService.java 接口

public interface UserService {
    void addUser(User user);
    List<User> listUser();
    void addDept(Dept dept);
    List<Dept> listDept();
}

UserServiceImpl.java 实现类

@Service
public class UserServiceImpl implements UserService {
    // 数据源1  放置到 springboot 数据库里面
    @Resource
    private UserRepository userRepository;
    //数据源2， 放置到 springboot2 数据库里面
    @Resource
    private DeptRepository deptRepository;
    /**
     * 使用的是数据源 springboot
     */
    @Override
    public void addUser(User user) {
        userRepository.save(user);
    }
    /**
     * 使用的是数据源 springboot
     */
    @Override
    public List<User> listUser() {
       return userRepository.findAll();
    }
    /**
     * 使用的是数据源 springboot2
     */
    @Override
    public void addDept(Dept dept) {
      deptRepository.save(dept);
    }
    /**
     * 使用的是数据源 springboot2
     */
    @Override
    public List<Dept> listDept() {
       return deptRepository.findAll();
    }
}

二.七测试

二.七.一创建测试类

@SpringBootTest
@Log4j2
public class MultipeDataSourceApplicationTests {
    @Autowired
    private UserService userService;
    @Test
    public void addUserTest(){
        //1. 构建对象
        User user=new User();
        user.setName("周小欢");
        user.setAge(22);
        user.setSex("女");
        user.setDescription("一个非常可爱的女孩纸");
        //2. 添加方法
        userService.addUser(user);
        log.info("添加员工成功");
    }
    @Test
    public void listUserTest(){
        List<User> userList=userService.listUser();
        userList.forEach(n->log.info(n));
    }
    @Test
    public void addDeptTest(){
        //1. 构建对象
        Dept dept=new Dept();
        dept.setName("信息管理部");
        //2. 添加方法
        userService.addDept(dept);
        log.info("添加部门成功");
    }
    @Test
    public void listDeptTest(){
        List<Dept> deptList=userService.listDept();
        deptList.forEach(n->log.info(n));
    }
    /**
     * 数据源切换配置
     */
    @Test
    public void allDataSourceTest(){
        addUserTest();
        listDeptTest();
        addDeptTest();
        listUserTest();
    }
}