首先需要創建多個數據庫

簡單的user表

CREATE TABLE `user` (`id` int NOT NULL AUTO_INCREMENT,`name` varchar(255) DEFAULT NULL,`age` int DEFAULT NULL,PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;

導入項目依賴

<dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-jdbc</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>2.1.4</version></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId></dependency><dependency><groupId>com.alibaba</groupId><artifactId>druid-spring-boot-starter</artifactId><version>1.1.10</version></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><scope>runtime</scope></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency></dependencies>

application.properties

spring.datasource.one.type=com.alibaba.druid.pool.DruidDataSource spring.datasource.one.username=root spring.datasource.one.password=feng10.10 spring.datasource.one.url=jdbc:mysql://localhost:3306/m_1?characterEncoding=utf8&serverTimezone=UTCspring.datasource.two.type=com.alibaba.druid.pool.DruidDataSource spring.datasource.two.username=root spring.datasource.two.password=feng10.10 spring.datasource.two.url=jdbc:mysql://localhost:3306/m_2?characterEncoding=utf8&serverTimezone=UTC# 多數據源配置時，mybatis這里設置的配置是不生效的！！ #mybatis.mapper-locations=classpath*:/mapper1/*.xml, classpath*:/mapper2/*.xml #mybatis.type-aliases-package=com.zlf.mybatisDemo.domain

手動配置數據源

DataSourceConfig.java

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.Configuration;import javax.sql.DataSource;/*** 配置多數據源*/ @Configuration public class DataSourceConfig {//將配置文件中對應的屬性注入改數據源中@ConfigurationProperties("spring.datasource.one")@BeanDataSource dsOne(){return DruidDataSourceBuilder.create().build();}//將配置文件中對應的屬性注入改數據源中@ConfigurationProperties("spring.datasource.two")@BeanDataSource dsTwo(){return DruidDataSourceBuilder.create().build();} }

手動配置myBatis配置

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.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.core.io.support.PathMatchingResourcePatternResolver;import javax.annotation.Resource; import javax.sql.DataSource;/*** 配置myBaits配置 1* 在@MapperScan注解中指定Mapper接口所在的位直， 同時指定SqlSessionFactory的實例名， 則該位置下的 Mapper將使用 SqlSessionFactory 實例。* 提供 SqlSessionFactory 的實例， 直接創建出來， 同時將 DataSource 的實例設置給 SqlSessionFactory，* 這里創建的 SqlSessionFactory 實例也就是@MapperScan 注解中 sqlSessionFactoryRef參數指定的實例 。*/ @Configuration @MapperScan(value = "com.zlf.mybatisDemo.mapper1",sqlSessionFactoryRef = "sqlSessionFactoryBean1") public class MyBatisConfigOne {@Resource(name = "dsOne")DataSource dataSource;/*** 提供 SqlSessionFactory 的實例， 直接創建出來， 同時將 DataSource 的實例設置給 SqlSessionFactory，* 這里創建的 SqlSessionFactory 實例也就是@MapperScan 注解中 sqlSessionFactoryRef參數指定的實例 。* @return* @throws Exception*/@BeanSqlSessionFactory sqlSessionFactoryBean1() throws Exception{SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean();factoryBean.setDataSource(dataSource);// 需要手動設置mapper文件的路徑factoryBean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath*:/mapper1/*.xml"));return factoryBean.getObject();}/*** 提供一個 SqlSessionTemplate 實例。 這是一個線程安全類，主要用來管理 MyBatis 中的 SqlSession 操作。* @return* @throws Exception*/@BeanSqlSessionTemplate sqlSessionTemplate1() throws Exception{return new SqlSessionTemplate(sqlSessionFactoryBean1());}} 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.boot.context.properties.ConfigurationProperties; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.core.io.support.PathMatchingResourcePatternResolver;import javax.annotation.Resource; import javax.sql.DataSource;/*** 配置myBaits配置 2* 在@MapperScan注解中指定Mapper接口所在的位直， 同時指定SqlSessionFactory的實例名， 則該位置下的 Mapper將使用 SqlSessionFactory 實例。* 提供 SqlSessionFactory 的實例， 直接創建出來， 同時將 DataSource 的實例設置給 SqlSessionFactory，* 這里創建的 SqlSessionFactory 實例也就是@MapperScan 注解中 sqlSessionFactoryRef參數指定的實例 。*/ @Configuration @MapperScan(value = "com.zlf.mybatisDemo.mapper2",sqlSessionFactoryRef = "sqlSessionFactoryBean2") public class MyBatisConfigTwo {@Resource(name = "dsTwo")DataSource dataSource;/*** 提供 SqlSessionFactory 的實例， 直接創建出來， 同時將 DataSource 的實例設置給 SqlSessionFactory，* 這里創建的 SqlSessionFactory 實例也就是@MapperScan 注解中 sqlSessionFactoryRef參數指定的實例 。* @return* @throws Exception*/@BeanSqlSessionFactory sqlSessionFactoryBean2() throws Exception{SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();sqlSessionFactoryBean.setDataSource(dataSource);// 需要手動設置mapper文件的路徑sqlSessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath*:/mapper2/*.xml"));return sqlSessionFactoryBean.getObject();}/*** 提供一個 SqlSessionTemplate 實例。 這是一個線程安全類，主要用來管理 MyBatis 中的 SqlSession 操作。* @return* @throws Exception*/@BeanSqlSessionTemplate sqlSessionTemplate2() throws Exception {return new SqlSessionTemplate(sqlSessionFactoryBean2());}}

項目結構

啟動類

import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplication//@MapperScan(basePackages = {"com.zlf.mybatisDemo.mapper1","com.zlf.mybatisDemo.mapper2"}) 已經在配置類中設置了 public class MybatisDemoApplication {public static void main(String[] args) {SpringApplication.run(MybatisDemoApplication.class, args);}}

測試結果

測試類

import com.zlf.mybatisDemo.domain.User; import com.zlf.mybatisDemo.mapper1.userMapper1; import com.zlf.mybatisDemo.mapper2.userMapper2; import org.junit.jupiter.api.Test; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.test.context.SpringBootTest;import java.util.List;@SpringBootTest class MybatisDemoApplicationTests {@AutowireduserMapper1 userMapper1;@AutowireduserMapper2 userMapper2;@Testvoid TestMybatis(){List<User> users1 = userMapper1.findAll();List<User> users2 = userMapper2.findAll();System.out.println("第一個數據源:m_1");System.out.println(users1);System.out.println("第二個數據源:m_2");System.out.println(users2);}}

總結

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