SpringBoot多数据源配置方式以及报错问题的解决

spring:
#单数据源
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    jdbc-url: jdbc:mysql://127.0.0.1:3306/meeting?serverTimezone=UTC
    username: root
    password: 1111
# 多数据源
  datasource:
    one: #数据源1的配置
      driver-class-name: com.mysql.cj.jdbc.Driver
      jdbc-url: jdbc:mysql://127.0.0.1:3306/meeting?serverTimezone=UTC
      username: root
      password: 1111
    two:  #数据源2的配置
      driver-class-name: com.mysql.cj.jdbc.Driver
      jdbc-url: jdbc:mysql://127.0.0.1:3306/xin-master?serverTimezone=UTC
      username: root
      password: 1111

@Configuration
> 这里进行mapper接口路径的扫描
@MapperScan(basePackages = "com.sbp.api.mapper.mapper1", sqlSessionTemplateRef = "db1SqlSessionTemplate")
public class DataSourceOneConfig {
> 这里是一个不同点，主库要加"@Primary"注解
    @Bean
    @ConfigurationProperties(prefix = "spring.datasource.one")
    @Primary
    public DataSource db1DataSource() {
        return DataSourceBuilder.create().build();
    }
> 这里是一个不同点，主库要加"@Primary"注解
    @Bean
    @Primary
    @Lazy  //这个是懒加载的注解，根据自己项目需要看是否添加 
    public SqlSessionFactory db1SqlSessionFactory(@Qualifier("db1DataSource") DataSource dataSource) throws Exception {
        MybatisSqlSessionFactoryBean bean = new MybatisSqlSessionFactoryBean();
        bean.setDataSource(dataSource);
        //开启驼峰
        MybatisConfiguration configuration = new MybatisConfiguration();
        configuration.setMapUnderscoreToCamelCase(true);
        bean.setConfiguration(configuration);
        > "这个方法的调用是指定当前数据源的mybatis的Xml文件的路径"
        bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mapping/mapper1/*.xml"));
        return bean.getObject();
    }
    @Bean
    @Primary
    public DataSourceTransactionManager db1TransactionManager(@Qualifier("db1DataSource") DataSource dataSource) {
        return new DataSourceTransactionManager(dataSource);
    }
    @Bean
    @Primary
    @Lazy
    public SqlSessionTemplate db1SqlSessionTemplate(@Qualifier("db1SqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
        return new SqlSessionTemplate(sqlSessionFactory);
    }
}

@Configuration
@MapperScan(basePackages = "com.sbp.api.mapper.mapper2", sqlSessionTemplateRef = "sqlSessionTemplate2")
public class DataSourceTwoConfig {
    @Bean(name = "dataSource2")
    @ConfigurationProperties(prefix = "spring.datasource.two")
    public DataSource dataSource() {
        return DataSourceBuilder.create().build();
    }
    @Bean(name = "sqlSessionFactory2")
    public SqlSessionFactory db1SqlSessionFactory(@Qualifier("db1DataSource") DataSource dataSource) throws Exception {
        MybatisSqlSessionFactoryBean bean = new MybatisSqlSessionFactoryBean();
        bean.setDataSource(dataSource);
        //开启驼峰
        MybatisConfiguration configuration = new MybatisConfiguration();
        configuration.setMapUnderscoreToCamelCase(true);
        bean.setConfiguration(configuration);
        bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mapping/mapper2/*.xml"));
        return bean.getObject();
    }
    @Bean(name = "transactionManager2")
    public DataSourceTransactionManager transactionManager(@Qualifier("dataSource2") DataSource dataSource) {
        return new DataSourceTransactionManager(dataSource);
    }
    @Bean(name = "sqlSessionTemplate2")
    public SqlSessionTemplate sqlSessionTemplate(@Qualifier("sqlSessionFactory2") SqlSessionFactory sqlSessionFactory) throws Exception {
        return new SqlSessionTemplate(sqlSessionFactory);
    }
}

> "这里@SpringBootApplication中的语句就是排除二者的自动mapper加载，如果你的项目中只有其中一个依赖的话，就只需要排除一个就行，"
> "我的项目在之前开发时，他们两个mybatis持久层框架都使用了，所以两个都需要排除"
@SpringBootApplication(exclude = {MybatisAutoConfiguration.class, MybatisPlusAutoConfiguration.class})
// 开启定时任务
@EnableScheduling
//@MapperScan("com.hnchances.api.mapper")  //多数据源，这里不需要包扫描
@Import({DataSourceOneConfig.class, DataSourceTwoConfig.class})
public class ApiApplication {
    public static void main(String[] args) {
        SpringApplication.run(ApiApplication.class, args);
    }
}