MyBatis-Plus使用动态表名分表查询的实现

 <dependency>
     <groupId>com.baomidou</groupId>
     <artifactId>mybatis-plus-boot-starter</artifactId>
     <version>3.5.3</version>   
 </dependency>

@Configuration
@Slf4j
public class MybatisPlusConfig {

    @Bean
    public MybatisPlusInterceptor mybatisPlusInterceptor() {
        MybatisPlusInterceptor mybatisPlusInterceptor = new MybatisPlusInterceptor();
        // 数据权限
        //mybatisPlusInterceptor.addInnerInterceptor(new DataFilterInterceptor());
        // 乐观锁
        mybatisPlusInterceptor.addInnerInterceptor(new OptimisticLockerInnerInterceptor());
        // 防止全表更新与删除
        mybatisPlusInterceptor.addInnerInterceptor(new BlockAttackInnerInterceptor());
        //动态表名
        DynamicTableNameInnerInterceptor dynamicTableNameInnerInterceptor = new DynamicTableNameInnerInterceptor();
        dynamicTableNameInnerInterceptor.setTableNameHandler((sql, tableName) -> { //匿名内部类
            String tenant = TenantContext.TENANT_DATA.get();
            // 如果不为空，使用动态表名。
            if (StringUtils.isNotBlank(tenant) && TenantContext.containsTableName(tableName)) {
                log.info("dynamicTableName -- >tableName={}, tenant={}",tableName, tenant);
                return tableName + "_" + tenant;
            }
            return tableName;
        });
        mybatisPlusInterceptor.addInnerInterceptor(dynamicTableNameInnerInterceptor);
        // 分页插件
        mybatisPlusInterceptor.addInnerInterceptor(new PaginationInnerInterceptor());
        return mybatisPlusInterceptor;
    }
}

public class TenantContext {

    // 需要替换的动态表名
    public static ThreadLocal<String> TENANT_DATA = new ThreadLocal<>();

    //用于记录哪些表可以使用该动态表名处理器
    private static List<String> tableNames = Arrays.asList("test_user");

    //设置请求线程的租户数据
    public static void setTenantData(String tenant) {
        TENANT_DATA.set(tenant);
    }

    //删除当前请求线程的租户数据
    public static void removeYearData() {
        TENANT_DATA.remove();
    }

    public static Boolean containsTableName(String tableName) {
        if (tableNames.contains(tableName)) {
            return true;
        }
        return false;
    }

}

@Data
@TableName("test_user")
public class TestUser implements Serializable {
    private String id;
    private String name;
    private String managerId;
    private String salary;
    private String age;
    private String departId;
    private String remark;
    private String province;
}

@RestController
@Slf4j
public class TestController {

    @Resource
    private ITestUserService testUserService;

    @GetMapping("/selectList")
    public List<TestUser> selectList(@RequestParam String tenant) {
        return testUserService.selectList(tenant);
    }
}

public interface ITestUserService extends IService<TestUser> {

    List<TestUser> selectList(String tenant);
}

@Service
public class TestUserServiceImpl extends ServiceImpl<TestUserMapper, TestUser> implements ITestUserService {

    @Overridejava
    public List<TestUser> selectList(String tenant) {
        TenantContext.setTenantData(tenant);
        Wrapper<TestUser> queryWrapper = new QueryWrapper<>();
        return baseMapper.selectList(queryWrapper);
    }
}