Spring boot配置多数据源代码实例

因项目需要在一个应用里从两个数据库取数，所以需要配置多数据源，网上找了好多方法才启动成功，整理如下。注意两个数据源的repository文件名不能相同，即使在不同的文件夹下，否则系统启动会报错。

配置文件

spring.datasource.primary.url=***
spring.datasource.primary.username=***
spring.datasource.primary.password=***
spring.datasource.primary.driver-class-name=com.mysql.jdbc.Driver

spring.datasource.second.url=***
spring.datasource.second.username=***
spring.datasource.second.password=***
spring.datasource.second.driver-class-name=com.mysql.jdbc.Driver

通用数据源配置

import com.alibaba.druid.pool.DruidDataSource;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.autoconfigure.jdbc.DataSourceBuilder;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;

import javax.sql.DataSource;

/**
 * @author ruanshuai
 * @date 2020/5/13
 */

@Configuration
public class DataSourceConfig {

  /**
   * 第一个数据连接，默认优先级最高
   * @return
   */
  @Primary
  @Bean(name = "primaryDataSource") //数据源1配置名
  @Qualifier("primaryDataSource") //数据源1配置名
  @ConfigurationProperties(prefix="spring.datasource.primary") //见配置文件
  public DataSource PrimaryDataSource() {
    return DataSourceBuilder.create().type(DruidDataSource.class).build();
  }

  /**
   * 第二个数据源
   * @return
   */
  @Bean(name = "secondDataSource") //数据源2配置名
  @Qualifier("secondDataSource") //数据源2配置名
  @ConfigurationProperties(prefix="spring.datasource.second") //见配置文件
  public DataSource secondaryDataSource() {
    return DataSourceBuilder.create().type(DruidDataSource.class).build();
  }
}

数据源1配置

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
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.persistence.EntityManager;
import javax.sql.DataSource;
import java.util.HashMap;
import java.util.Map;

/**
 * @author ruanshuai
 * @date 2020/5/13
 */

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
    entityManagerFactoryRef="entityManagerFactoryPrimary",
    transactionManagerRef="transactionManagerPrimary",
    basePackages= { "***此处为数据源1 repository的存放文件夹***" })
public class PrimaryConfig {

  @Autowired
  @Qualifier("primaryDataSource")
  private DataSource primaryDataSource;

  @Primary
  @Bean(name = "entityManagerPrimary")
  public EntityManager entityManager(EntityManagerFactoryBuilder builder) {
    return entityManagerFactoryPrimary(builder).getObject().createEntityManager();
  }

  @Primary
  @Bean(name = "entityManagerFactoryPrimary")
  public LocalContainerEntityManagerFactoryBean entityManagerFactoryPrimary (EntityManagerFactoryBuilder builder) {
    return builder
        .dataSource(primaryDataSource)
        .properties(getVendorProperties())
        .packages("***实体类所在文件夹，两个数据源的实体类可相同***")
        .persistenceUnit("primaryPersistenceUnit")
        .build();
  }

  private Map<String, String> getVendorProperties() {
    Map<String, String> jpaProperties = new HashMap<>(16);
    jpaProperties.put("hibernate.hbm2ddl.auto", "update");
    jpaProperties.put("hibernate.show_sql", System.getProperty("spring.jpa.show-sql"));
    jpaProperties.put("hibernate.dialect", System.getProperty("spring.jpa.properties.hibernate.dialect"));
    jpaProperties.put("hibernate.current_session_context_class", "org.springframework.orm.hibernate5.SpringSessionContext");
    return jpaProperties;
  }

  @Primary
  @Bean(name = "transactionManagerPrimary")
  public PlatformTransactionManager transactionManagerPrimary(EntityManagerFactoryBuilder builder) {
    return new JpaTransactionManager(entityManagerFactoryPrimary(builder).getObject());
  }
}

数据源2配置

import org.omg.CORBA.Environment;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
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.persistence.EntityManager;
import javax.sql.DataSource;
import java.util.HashMap;
import java.util.Map;

/**
 * @author ruanshuai
 * @date 2020/5/13
 */

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
    //实体管理
    entityManagerFactoryRef="entityManagerFactorySecond",
    //事务管理
    transactionManagerRef="transactionManagerSecond",
    //实体扫描,设置Repository所在位置
    basePackages= { "***此处为数据源1 repository的存放文件夹***" })
public class SecondConfig {

  @Autowired
  @Qualifier("secondDataSource")
  private DataSource secondDataSource;

  @Bean(name = "entityManagerSecond")
  public EntityManager entityManager(EntityManagerFactoryBuilder builder) {
    return entityManagerFactorySecond(builder).getObject().createEntityManager();
  }

  @Bean(name = "entityManagerFactorySecond")
  public LocalContainerEntityManagerFactoryBean entityManagerFactorySecond (EntityManagerFactoryBuilder builder) {
    return builder
        .dataSource(secondDataSource)
        .properties(getVendorProperties())
        .packages("***实体类所在文件夹，两个数据源的实体类可相同***")
        .persistenceUnit("secondPersistenceUnit")
        .build();
  }

  private Map<String, String> getVendorProperties() {
    Map<String, String> jpaProperties = new HashMap<>(16);
    jpaProperties.put("hibernate.hbm2ddl.auto", "update");
    jpaProperties.put("hibernate.show_sql", System.getProperty("spring.jpa.show-sql"));
    jpaProperties.put("hibernate.dialect", System.getProperty("spring.jpa.properties.hibernate.dialect"));
    jpaProperties.put("hibernate.current_session_context_class", "org.springframework.orm.hibernate5.SpringSessionContext");
    return jpaProperties;
  }

  @Bean(name = "transactionManagerSecond")
  PlatformTransactionManager transactionManagerSecond(EntityManagerFactoryBuilder builder) {
    return new JpaTransactionManager(entityManagerFactorySecond(builder).getObject());
  }
}

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