Mybatis-plus使用TableNameHandler分表详解(附完整示例源码)

/**
 * 按天分表解析
 */
public class DaysTableNameParser implements TableNameHandler {

  @Override
  public String dynamicTableName(String sql, String tableName) {
    String dateDay = LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyyMMdd"));
    return tableName + "_" + dateDay;
  }
}

/**
 * 按id取模分表处理器
 */
public class IdModTableNameParser implements TableNameHandler {
  private Integer mod;

  //使用ThreadLocal防止多线程相互影响
  private static ThreadLocal<Integer> id = new ThreadLocal<Integer>();

  public static void setId(Integer idValue) {
    id.set(idValue);
  }

  IdModTableNameParser(Integer modValue) {
    mod = modValue;
  }

  @Override
  public String dynamicTableName(String sql, String tableName) {
    Integer idValue = id.get();
    if (idValue == null) {
      throw new RuntimeException("请设置id值");
    } else {
      String suffix = String.valueOf(idValue % mod);
      //这里清除ThreadLocal的值，防止线程复用出现问题
      id.set(null);
      return tableName + "_" + suffix;
    }
  }
}

@Configuration
@MapperScan(basePackages = "com.yourcom.proname.repository.mapper.mainDb*", sqlSessionFactoryRef = "mainSqlSessionFactory")
public class MainDb {
  @Bean(name = "mainDataSource")
  @ConfigurationProperties(prefix = "dbconfig.maindb")
  public DataSource druidDataSource() {
    return DruidDataSourceBuilder.create().build();
  }

  @Bean(name = "mainTransactionManager")
  public DataSourceTransactionManager masterTransactionManager(@Qualifier(value = "mainDataSource") DataSource dataSource) {
    return new DataSourceTransactionManager(dataSource);
  }

  @Bean(name = "mainSqlSessionFactory")
  @ConfigurationPropertiesBinding()
  public SqlSessionFactory sqlSessionFactory(@Qualifier(value = "mainDataSource") DataSource dataSource) throws Exception {
    MybatisSqlSessionFactoryBean factoryBean = new MybatisSqlSessionFactoryBean();
    factoryBean.setDataSource(dataSource);
     //加载插件
    factoryBean.setPlugins(mybatisPlusInterceptor());
    return factoryBean.getObject();
  }

  @Bean
  public MybatisPlusInterceptor mybatisPlusInterceptor() {
    MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
    DynamicTableNameInnerInterceptor dynamicTableNameInnerInterceptor = new DynamicTableNameInnerInterceptor();
    HashMap<String, TableNameHandler> map = new HashMap<String, TableNameHandler>();

    //这里为不同的表设置对应表名处理器
    map.put("user_daily_record", new DaysTableNameParser());
    map.put("user_consume_flow", new IdModTableNameParser(10));

    dynamicTableNameInnerInterceptor.setTableNameHandlerMap(map);
    interceptor.addInnerInterceptor(dynamicTableNameInnerInterceptor);
    return interceptor;
  }
}

@RestController
public class TableTestController {
  @Resource
  IUserDailyRecordService userDailyRecordService;

  @Resource
  IUserConsumeFlowService userConsumeFlowService;

  @GetMapping("user/record/today")
  public CommonResVo<UserDailyRecord> getRecordToday(Integer userId) throws Exception {
    //这里在查询时，会根据系统当前时间，自动生成当天的表名
    UserDailyRecord userDailyRecord = userDailyRecordService.getOne(new LambdaQueryWrapper<UserDailyRecord>().eq(UserDailyRecord::getUserId, userId));
    return CommonResVo.success(userDailyRecord);
  }

  @GetMapping("user/consume/flow")
  public CommonResVo<List<UserConsumeFlow>> getConsumeFlow(Integer userId) throws Exception {
    //设置用于分表的id值
    IdModTableNameParser.setId(userId);
    List<UserConsumeFlow> userConsumeFlowList = userConsumeFlowService.list(new LambdaQueryWrapper<UserConsumeFlow>().eq(UserConsumeFlow::getUserId, userId));
    return CommonResVo.success(userConsumeFlowList);
  }

  /**
   * 新增数据
   */
  @PostMapping("user/consume/flow")
  public CommonResVo<Boolean> addConsumeFlow(@RequestBody UserConsumeFlow userConsumeFlow) throws Exception {
    Integer userId = userConsumeFlow.getUserId();
    //设置用于分表的id值
    IdModTableNameParser.setId(userId);
    userConsumeFlowService.save(userConsumeFlow);
    return CommonResVo.success(true);
  }
}