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MP官方文档提供有多数据源配置方案，这里没有使用其方案，原因是项目不想引入过多依赖

提供一下官网的文档供各位选择多数据源支持 | MyBatis-Plus (baomidou.com)

配置文件

application.properties文件配置两个数据源信息，yaml文件自行修改格式

# db1 database
spring.datasource.db1.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.db1.type=com.zaxxer.hikari.HikariDataSource
spring.datasource.db1.url=jdbc:mysql://127.0.0.1:3306/db1?useUnicode=true&characterEncoding=utf-8&serverTimezone=Asia/Shanghai&useSSL=false&rewriteBatchedStatements=true
spring.datasource.db1.username=root
spring.datasource.db1.password=123456
spring.datasource.db1.hikari.pool-name=db1
spring.datasource.db1.hikari.auto-commit=true
spring.datasource.db1.hikari.connection-timeout=30000
spring.datasource.db1.hikari.idle-timeout=600000
spring.datasource.db1.hikari.max-lifetime=1800000
spring.datasource.db1.hikari.maximum-pool-size=10
spring.datasource.db1.hikari.leak-detection-threshold=30000# db2 database
spring.datasource.db2.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.db2.type=com.zaxxer.hikari.HikariDataSource
spring.datasource.db2.url=jdbc:mysql://127.0.0.1:3306/db2?useUnicode=true&characterEncoding=utf-8&serverTimezone=Asia/Shanghai&useSSL=false&rewriteBatchedStatements=true
spring.datasource.db2.username=root
spring.datasource.db2.password=123456
spring.datasource.db2.hikari.pool-name=db2
spring.datasource.db2.hikari.auto-commit=true
spring.datasource.db2.hikari.connection-timeout=30000
spring.datasource.db2.hikari.idle-timeout=600000
spring.datasource.db2.hikari.max-lifetime=1800000
spring.datasource.db2.hikari.maximum-pool-size=10
spring.datasource.db2.hikari.leak-detection-threshold=30000

 创建DataSourceConfig类

我这里两个数据源写在一个文件里面，也可以拆分成两个。

注意mapper接口和xml的目录，不同的数据源在不同的包里面

因为整合的mybatis-plus，所以这里的SqlSessionFactory 为 MyBatis-Plus 的 SqlSessionFactory

com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean

@Configuration
@MapperScan(basePackages = {"com.xxx.mapper.db1"}, sqlSessionFactoryRef = "db1SqlSessionFactory")
@MapperScan(basePackages = {"com.xxx.mapper.db2"}, sqlSessionFactoryRef = "db2SqlSessionFactory")
public class DataSourceConfig {/***  db1数据源配置* @return*/@Bean(name = "db1DataSourceProperties")@Primary@ConfigurationProperties("spring.datasource.db1")public DataSourceProperties db1DataSourceProperties() {return new DataSourceProperties();}@Primary@Bean(name = "db1DataSource")@Qualifier("db1DataSource")@ConfigurationProperties(prefix = "spring.datasource.db1.hikari")public HikariDataSource db1DataSource() {return db1DataSourceProperties().initializeDataSourceBuilder().type(HikariDataSource.class).build();}@Primary@Bean("db1DataSourceTransactionManager")public DataSourceTransactionManager db1DataSourceTransactionManager(@Qualifier("db1DataSource") DataSource dataSource) {return new DataSourceTransactionManager(dataSource);}@Primary@Bean("db1SqlSessionFactory")public SqlSessionFactory db1SqlSessionFactory(@Qualifier("db1DataSource") DataSource dataSource) throws Exception {MybatisSqlSessionFactoryBean sqlSessionFactory = new MybatisSqlSessionFactoryBean();sqlSessionFactory.setDataSource(dataSource);Resource[] resources = new PathMatchingResourcePatternResolver().getResources("classpath:mapper/db1/*.xml");sqlSessionFactory.setMapperLocations(resources);// 插件对象MybatisPlusInterceptor mybatisPlusInterceptor = new MybatisPlusInterceptor();//分页插件mybatisPlusInterceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.MYSQL));sqlSessionFactory.setPlugins(mybatisPlusInterceptor);return sqlSessionFactory.getObject();}/***  db2数据源配置* @return*/@Bean(name = "db2DataSourceProperties")@ConfigurationProperties("spring.datasource.db2")public DataSourceProperties db2DataSourceProperties() {return new DataSourceProperties();}@Bean(name = "db2DataSource")@Qualifier("db2DataSource")@ConfigurationProperties(prefix="spring.datasource.db2.hikari")public DataSource db2DataSource() {return db2DataSourceProperties().initializeDataSourceBuilder().type(HikariDataSource.class).build();}@Bean("db2DataSourceTransactionManager")public DataSourceTransactionManager db2DataSourceTransactionManager(@Qualifier("db2DataSource") DataSource dataSource) {return new DataSourceTransactionManager(dataSource);}@Bean("db2SqlSessionFactory")public SqlSessionFactory db2SqlSessionFactory(@Qualifier("db2DataSource") DataSource dataSource) throws Exception {MybatisSqlSessionFactoryBean sqlSessionFactory = new MybatisSqlSessionFactoryBean();sqlSessionFactory.setDataSource(dataSource);Resource[] resources = new PathMatchingResourcePatternResolver().getResources("classpath:mapper/db2/*.xml");sqlSessionFactory.setMapperLocations(resources);// 插件对象MybatisPlusInterceptor mybatisPlusInterceptor = new MybatisPlusInterceptor();//分页插件mybatisPlusInterceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.MYSQL));sqlSessionFactory.setPlugins(mybatisPlusInterceptor);return sqlSessionFactory.getObject();}
}

参考链接

Spring Boot 2.7.5 HikariCP 连接池多数据源配置_hikari多数据源配置-CSDN博客

Spring Boot Reference Documentation