SpringBoot 2.0整合mybatis 实现多数据源

闲来无事，偶然看见了springboot 可以整合多个数据源，本文就来实现一下！ 参考例子

本文使用的是springboot 2.1.3，mysql6.0以上的版本，具体配置较之前的版本可能有点差距，详细配置请看代码。

pom.xml

<?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 http://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>2.1.3.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.example</groupId>
	<artifactId>multi-data-source</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>multi-data-source</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-test</artifactId>
			<scope>test</scope>
		</dependency>

		<!-- https://mvnrepository.com/artifact/org.mybatis.spring.boot/mybatis-spring-boot-starter -->
		<dependency>
			<groupId>org.mybatis.spring.boot</groupId>
			<artifactId>mybatis-spring-boot-starter</artifactId>
			<version>1.3.3</version>
		</dependency>

		<!-- https://mvnrepository.com/artifact/com.alibaba/druid -->
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>druid</artifactId>
			<version>1.1.13</version>
		</dependency>

		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<scope>runtime</scope>
		</dependency>


	</dependencies>

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

</project>

application.properties :

first.datasource.jdbc-url=jdbc:mysql://localhost:3306/first?serverTimezone=UTC&useUnicode=true&characterEncoding=utf8&useSSL=false
first.datasource.username=root
first.datasource.password=123456
first.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
first.datasource.type=com.alibaba.druid.pool.DruidDataSource

second.datasource.jdbc-url=jdbc:mysql://localhost:3306/second?serverTimezone=UTC&useUnicode=true&characterEncoding=utf8&useSSL=false
second.datasource.username=root
second.datasource.password=123456
second.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
second.datasource.type=com.alibaba.druid.pool.DruidDataSource

server.port=8090

这里的配置前缀可自行定义，springboot2.0以上的版本，数据库的 url 变成了 jdbc-url，mysql 6.0 驱动从 com.mysql.jdbc.Driver 变成了 com.mysql.cj.jdbc.Driver 请注意版本问题，不然会报错

项目结构：
在这里插入图片描述
代码：

两个配置类，StudentMybatisConfig 、 UserMybatisConfig

package com.example.multidatasource.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.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternResolver;

import javax.sql.DataSource;
import java.io.IOException;

/**
 * @author HX
 * @date 2019-03-28 15:24
 */
@Configuration
@MapperScan(basePackages = "com.example.multidatasource.mapper.user", sqlSessionTemplateRef = "userSqlSessionTemplate")
public class UserMybatisConfig {

    @Bean(name = "userDataSource")
    @Primary  // 表示这个数据源是默认数据源,第二个数据源配置类不用加
    @ConfigurationProperties(prefix = "first.datasource")
    public DataSource userDataSource() {
        return DataSourceBuilder.create().build();
    }



    @Bean
    public SqlSessionFactory userSqlSessionFactory(@Qualifier("userDataSource") DataSource dataSource) throws IOException {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(dataSource);
        // 添加XML目录
        ResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
        bean.setMapperLocations(resolver.getResources("classpath*:mapper/user/*.xml"));
        try {
            return bean.getObject();
        } catch (Exception e) {
            e.printStackTrace();
            throw new RuntimeException(e);
        }
    }



    @Bean
    public SqlSessionTemplate userSqlSessionTemplate(@Qualifier("userSqlSessionFactory") SqlSessionFactory sqlSessionFactory){
        return new SqlSessionTemplate(sqlSessionFactory);
    }



}

package com.example.multidatasource.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.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternResolver;

import javax.sql.DataSource;
import java.io.IOException;

/**
 * @author HX
 * @date 2019-03-28 15:52
 */
@Configuration
@MapperScan(basePackages = "com.example.multidatasource.mapper.stu", sqlSessionTemplateRef = "stuSqlSessionTemplate")
public class StudentMybatisConfig {

    @Bean
    @ConfigurationProperties(prefix = "second.datasource") // 数据源配置前缀
    public DataSource stuDataSource() {
        return DataSourceBuilder.create().build();
    }



    @Bean
    public SqlSessionFactory stuSqlSessionFactory(@Qualifier("stuDataSource") DataSource dataSource) throws IOException {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(dataSource);
        // 添加XML目录
        ResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
        bean.setMapperLocations(resolver.getResources("classpath*:mapper/stu/*.xml"));
        try {
            return bean.getObject();
        } catch (Exception e) {
            e.printStackTrace();
            throw new RuntimeException(e);
        }
    }



    @Bean
    public SqlSessionTemplate stuSqlSessionTemplate(@Qualifier("stuSqlSessionFactory") SqlSessionFactory sqlSessionFactory){
        return new SqlSessionTemplate(sqlSessionFactory);
    }

}

mapper 注意包结构

package com.example.multidatasource.mapper.stu;

import com.example.multidatasource.domain.Student;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Repository;

/**
 * @author HX
 * @date 2019-03-28 16:19
 */
@Mapper
@Repository
public interface StudentMapper {

    Student findStudentByName(String name);

}

package com.example.multidatasource.mapper.user;

import com.example.multidatasource.domain.User;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Repository;

/**
 * @author HX
 * @date 2019-03-28 16:12
 */
@Mapper
@Repository
public interface UserMapper {
    User findUserById(String id);
}

xml文件：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.example.multidatasource.mapper.stu.StudentMapper">
  
    <select id="findStudentByName" resultType="com.example.multidatasource.domain.Student" parameterType="java.lang.String">
        SELECT name ,age  FROM t_student where id = #{id};

    </select>

</mapper>

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.example.multidatasource.mapper.user.UserMapper">
  
    <select id="findUserById" resultType="com.example.multidatasource.domain.User" parameterType="java.lang.String">
        SELECT username userName,password passWord FROM t_user where id = #{id};

    </select>

</mapper>

数据库数据：

在这里插入图片描述

测试：

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package com.example.multidatasource;

import com.example.multidatasource.domain.Student;
import com.example.multidatasource.domain.User;
import com.example.multidatasource.mapper.stu.StudentMapper;
import com.example.multidatasource.mapper.user.UserMapper;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

@RunWith(SpringRunner.class)
@SpringBootTest
public class MultiDataSourceApplicationTests {
    @Autowired
    UserMapper userMapper;

    @Autowired
    StudentMapper stuMapper;

    @Test
    public void contextLoads() {

        User user = userMapper.findUserById("1");
        Student student = stuMapper.findStudentByName("1");

        System.out.println(user);
        System.out.println(student);

    }

}

结果：
在这里插入图片描述

SpringBoot 2.0整合mybatis 实现多数据源

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