springboot2.0系列七（整合多数据源）

原理使用根据包名，加载不同的数据源

项目结构

pom文件 

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.4.1</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>springbootduoshujuyuan</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>springbootduoshujuyuan</name>
<description>Demo project for Spring Boot</description>

<properties>
<java.version>1.8</java.version>
</properties>

<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- mysql 依赖 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<!-- mybatis 依赖 -->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.1.1</version>
</dependency>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>

<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>

</project>

配置文件中新增两个数据源

###datasource1
spring.datasource.test1.driver-class-name = com.mysql.jdbc.Driver
spring.datasource.test1.jdbc-url = jdbc:mysql://localhost:3306/test01?useUnicode=true&characterEncoding=utf-8&serverTimezone=Asia/Shanghai
spring.datasource.test1.username = root
spring.datasource.test1.password = 123@qq
###datasource2
spring.datasource.test2.driver-class-name = com.mysql.jdbc.Driver
spring.datasource.test2.jdbc-url = jdbc:mysql://localhost:3306/test02?useUnicode=true&characterEncoding=utf-8&serverTimezone=Asia/Shanghai
spring.datasource.test2.username = root
spring.datasource.test2.password = 123@qq

建立连接数据源的配置文件

package com.example.springbootduoshujuyuan.config;

import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.SqlSessionTemplate;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.jdbc.DataSourceBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;

import javax.sql.DataSource;

//DataSource01
@Configuration // 注册到springboot容器中
@MapperScan(basePackages = "com.example.springbootduoshujuyuan.test01", sqlSessionFactoryRef = "test1SqlSessionFactory")
public class DataSource1Config {

   /**
    * 
    * 功能描述:(配置test1数据库)
    */
   @Bean(name = "test1DataSource")
   @ConfigurationProperties(prefix = "spring.datasource.test1")
   @Primary
   public DataSource testDataSource() {
      return DataSourceBuilder.create().build();
   }

   /**
    * 
    *  功能描述:(test1 sql会话工厂)
    *
    */
   @Bean(name = "test1SqlSessionFactory")
   @Primary
   public SqlSessionFactory testSqlSessionFactory(@Qualifier("test1DataSource") DataSource dataSource)
         throws Exception {
      SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
      bean.setDataSource(dataSource);
      // bean.setMapperLocations(
      // new
      // PathMatchingResourcePatternResolver().getResources("classpath:mybatis/mapper/test1/*.xml"));
      return bean.getObject();
   }

   /**
    * 
    *  功能描述:(test1 事物管理)
    *
    */
   @Bean(name = "test1TransactionManager")
   @Primary
   public DataSourceTransactionManager testTransactionManager(@Qualifier("test1DataSource") DataSource dataSource) {
      return new DataSourceTransactionManager(dataSource);
   }

   @Bean(name = "test1SqlSessionTemplate")
   @Primary
   public SqlSessionTemplate testSqlSessionTemplate(
         @Qualifier("test1SqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
      return new SqlSessionTemplate(sqlSessionFactory);
   }

}

package com.example.springbootduoshujuyuan.config;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.SqlSessionTemplate;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.jdbc.DataSourceBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;

import javax.sql.DataSource;

//DataSource2
@Configuration // 注册到springboot容器中
@MapperScan(basePackages = "com.itmayiedu.test02", sqlSessionFactoryRef = "test2SqlSessionFactory")
public class DataSource2Config {

   /**
    * 功能描述:(配置test2数据库)
    *
    */
   @Bean(name = "test2DataSource")
   @ConfigurationProperties(prefix = "spring.datasource.test2")
   public DataSource testDataSource() {
      return DataSourceBuilder.create().build();
   }

   /**
    *
    功能描述:(test2 sql会话工厂)
    */
   @Bean(name = "test2SqlSessionFactory")
   public SqlSessionFactory testSqlSessionFactory(@Qualifier("test2DataSource") DataSource dataSource)
         throws Exception {
      SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
      bean.setDataSource(dataSource);
      // bean.setMapperLocations(
      // new
      // PathMatchingResourcePatternResolver().getResources("classpath:mybatis/mapper/test2/*.xml"));
      return bean.getObject();
   }

   /**
   功能描述:(test2 事物管理)
    */
   @Bean(name = "test2TransactionManager")
   public DataSourceTransactionManager testTransactionManager(@Qualifier("test2DataSource") DataSource dataSource) {
      return new DataSourceTransactionManager(dataSource);
   }

   @Bean(name = "test2SqlSessionTemplate")
   public SqlSessionTemplate testSqlSessionTemplate(
         @Qualifier("test2SqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
      return new SqlSessionTemplate(sqlSessionFactory);
   }

}

创建分包Mapper

package com.example.springbootduoshujuyuan.test01.mapper;

  

  import org.apache.ibatis.annotations.Insert;

  import org.apache.ibatis.annotations.Param;

  

  public interface User1Mapper {

   @Insert("insert into users values(null,#{name},#{age});")

   public int addUser(@Param("name") String name, @Param("age") Integer age);

}

创建分包Mapper

package com.example.springbootduoshujuyuan.test02.mapper;

  

  import org.apache.ibatis.annotations.Insert;

  import org.apache.ibatis.annotations.Param;

  

  public interface User2Mapper {

   @Insert("insert into users values(null,#{name},#{age});")

   public int addUser(@Param("name") String name, @Param("age") Integer age);

}

创建userservice

package com.example.springbootduoshujuyuan;

  

  import com.example.springbootduoshujuyuan.test01.mapper.User1Mapper;

  import com.example.springbootduoshujuyuan.test02.mapper.User2Mapper;

  import org.springframework.beans.factory.annotation.Autowired;

  import org.springframework.stereotype.Service;

  

  @Service

  public class UserService {

    @Autowired

    User1Mapper user1Mapper;

  

    @Autowired

    User2Mapper user2Mapper;

  

    public int addUser1( String name,  Integer age){

        return  user1Mapper.addUser(name,age);

    }

    public int addUser2( String name,  Integer age){

        return  user2Mapper.addUser(name,age);

    }

}

创建userController

package com.example.springbootduoshujuyuan.controller;

  

  

  import com.example.springbootduoshujuyuan.UserService;

  import org.springframework.beans.factory.annotation.Autowired;

  import org.springframework.web.bind.annotation.GetMapping;

  import org.springframework.web.bind.annotation.RestController;

  

  @RestController

  public class userController {

    @Autowired

    UserService userService;

  

    @GetMapping("user")

    public boolean addUser( String name,  Integer age) {

   if (userService.addUser1(name,age)==1&&userService.addUser2(name,age)==1){

       return true;

   }return false;

    }

}

多数据源事务注意事项

在多数据源的情况下，使用@Transactional注解时，应该指定事务管理者

@Transactional(transactionManager = "test2TransactionManager")

启动项目

@SpringBootApplication public class App {       public static void main(String[] args) {             SpringApplication.run(App.class, args);       } }

 

效果

异常解决

No qualifying bean of type [javax.sql.DataSource] is defined: expected single matching bean but found 2: test1DataSource,test2DataSource

加上@Primary即可。

 

 

There was an unexpected error (type=Internal Server Error, status=500).

No qualifying bean of type 'org.springframework.transaction.PlatformTransactionManager' available: expected single matching bean but found 2: test1TransactionManager,test2TransactionManager

 

 指定事务管理器

 

 

Springboot1.5的时候 没有默认指向数据源 会报错

Springboot2.0的时候 不报错