springboot 多数据源怎么配置在控制台的sql打印日志

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单数据源的配置：

mybatis-plus:
  mapper-locations: classpath:mapper/*.xml
  configuration:
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl

但是多数据源就不适用了，那么多数据源应该怎么配置呢？

先看看多数据源配置实现：

application.yml:

spring:
  #数据源配置(可配置多个数据库)
  datasource:
    #主数据库
    master:
      type: com.alibaba.druid.pool.DruidDataSource
      driverClassName: com.mysql.jdbc.Driver
      url: jdbc:mysql://localhost:3306/hello1?useUnicode=true&characterEncoding=UTF-8&useSSL=false
      username: root
      password: 1234
    slave:
      type: com.alibaba.druid.pool.DruidDataSource
      driverClassName: com.mysql.jdbc.Driver
      url: jdbc:mysql://localhost:3306/hello2?useUnicode=true&characterEncoding=UTF-8&useSSL=false
      username: root
      password: 1234

配置数据源：

MasterDataSourceConfig.java

@Configuration
@MapperScan(basePackages = "com.master.*.Mapper", sqlSessionFactoryRef = "masterSqlSessionFactory")
public class MasterDataSourceConfig {

    static String MAPPER_LOCATION = "classpath*:masterMapper/*Mapper.xml";


    /**
     * 配置数据源
     * @return
     */
    @Bean(name = "masterDataSource")
    @ConfigurationProperties(prefix = "spring.datasource.master")
    public DataSource masterDataSource() {
        return new DruidDataSource();
    }

    /**
     * 事务管理器
     */
    @Bean(name = "masterTransactionManager")
    public DataSourceTransactionManager masterTransactionManager() {
        return new DataSourceTransactionManager(masterDataSource());
    }

    /**
     * 会话工厂
     */
    @Bean(name = "masterSqlSessionFactory")
    public SqlSessionFactory masterSqlSessionFactory(@Qualifier("masterDataSource") DataSource masterDataSource) throws Exception {
        final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
        sessionFactory.setDataSource(masterDataSource);
        sessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(MasterDataSourceConfig.MAPPER_LOCATION));
        return sessionFactory.getObject();
    }
}

SlaveDataSourceConfig.java

@Configuration
@MapperScan(basePackages = "com.slave.*.Mapper", sqlSessionFactoryRef = "slaveSqlSessionFactory")
public class SlaveDataSourceConfig {

    static String MAPPER_LOCATION = "classpath*:slaveMapper/*Mapper.xml";


    /**
     * 配置数据源
     * @return
     */
    @Bean(name = "slaveDataSource")
    @ConfigurationProperties(prefix = "spring.datasource.slave")
    public DataSource slaveDataSource() {
        return new DruidDataSource();
    }

    /**
     * 事务管理器
     */
    @Bean(name = "slaveTransactionManager")
    public DataSourceTransactionManager slaveTransactionManager() {
        return new DataSourceTransactionManager(slaveDataSource());
    }

    /**
     * 会话工厂
     */
    @Bean(name = "slaveSqlSessionFactory")
    public SqlSessionFactory slaveSqlSessionFactory(@Qualifier("slaveDataSource") DataSource slaveDataSource) throws Exception {
        final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
        sessionFactory.setDataSource(slaveDataSource);
        sessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(SlaveDataSourceConfig.MAPPER_LOCATION));
        return sessionFactory.getObject();
    }
}

如果想打印Master数据源的sql日志，修改SqlSessionFactory，添加sql打印配置，slave同理。

/**
     * 会话工厂
     */
    @Bean(name = "slaveSqlSessionFactory")
    public SqlSessionFactory slaveSqlSessionFactory(@Qualifier("slaveDataSource") DataSource slaveDataSource) throws Exception {
        final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
        sessionFactory.setDataSource(slaveDataSource);
        sessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(SlaveDataSourceConfig.MAPPER_LOCATION));

        MybatisConfiguration configuration = new MybatisConfiguration();
        configuration.setMapUnderscoreToCamelCase(true);
        // 配置打印sql语句
        configuration.setLogImpl(StdOutImpl.class);
        sessionFactory.setConfiguration(configuration);
        return sessionFactory.getObject();
    }