因專案需要在一個應用裡從兩個資料庫取數，所以需要配置多資料來源，網上找了好多方法才啟動成功，整理如下。注意兩個資料來源的repository檔名不能相同，即使在不同的資料夾下，否則系統啟動會報錯。

配置檔案

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

通用資料來源配置

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 {

  /**
   * 第一個資料連線，預設優先順序最高
   * @return
   */
  @Primary
  @Bean(name = "primaryDataSource") //資料來源1配置名
  @Qualifier("primaryDataSource") //資料來源1配置名
  @ConfigurationProperties(prefix="spring.datasource.primary") //見配置檔案
  public DataSource PrimaryDataSource() {
    return DataSourceBuilder.create().type(DruidDataSource.class).build();
  }

  /**
   * 第二個資料來源
   * @return
   */
  @Bean(name = "secondDataSource") //資料來源2配置名
  @Qualifier("secondDataSource") //資料來源2配置名
  @ConfigurationProperties(prefix="spring.datasource.second") //見配置檔案
  public DataSource secondaryDataSource() {
    return DataSourceBuilder.create().type(DruidDataSource.class).build();
  }
}

資料來源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= { "***此處為資料來源1 repository的存放資料夾***" })
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("***實體類所在資料夾，兩個資料來源的實體類可相同***")
        .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());
  }
}

資料來源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(
    //實體管理
    entityManagerFactoryRef="entityManagerFactorySecond",//事務管理
    transactionManagerRef="transactionManagerSecond",//實體掃描,設定Repository所在位置
    basePackages= { "***此處為資料來源1 repository的存放資料夾***" })
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("***實體類所在資料夾，兩個資料來源的實體類可相同***")
        .persistenceUnit("secondPersistenceUnit")
        .build();
  }

  private Map<String,"org.springframework.orm.hibernate5.SpringSessionContext");
    return jpaProperties;
  }

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

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支援我們。