tdengine-demo's Introduction

tdengine-demo

TDengine ORM demo

ORM 框架

    <dependency>
         <groupId>io.xream.x7</groupId>
         <artifactId>x7-spring-boot-starter</artifactId>
         ....
    </dependency>

实体类注解

public class HeatSupply {

    @X.Key
    private Long id; //System.currentTimeMillis()
    private BigDecimal value;
    @X.Tag
    private String city;
    @X.Tag
    private String zone;
    @X.TagTarget //标注sn作为子表名后缀
    private String sn;
    
    ....

Repository

@Repository
public interface HeatSupplyRepository extends BaseRepository<HeatSupply>, ResultMapRepository {}

插入

    HeatSupply heatSupply = new HeatSupply();
    heatSupply.setId(System.currentTimeMillis());
    heatSupply.setCity("北京市");
    heatSupply.setZone("朝阳区");
    heatSupply.setSn("H100003");
    heatSupply.setValue(new BigDecimal(15));
    
    this.heatSupplyRepository.create(heatSupply);

查找

    CriteriaBuilder.ResultMapBuilder criteriaBuilder = CriteriaBuilder.resultMapBuilder();
    criteriaBuilder.reduce(ReduceType.SUM, "value");
    criteriaBuilder.eq("city","北京市").eq("zone","朝阳区");
    //criteriaBuilder.xAggr("INTERVAL(?)", interval); //报语法错误 INTERVAL('2s'), 等TDengine官方支持
    if (StringUtil.isNotNull(interval)) {//需要显示判断是否为null
        criteriaBuilder.xAggr("INTERVAL(" + interval + ")");//INTERVAL(2s)
    }

    criteriaBuilder.paged().page(1).rows(10).ignoreTotalRows();
    
    Criteria.ResultMapCriteria criteria = criteriaBuilder.build();

    List<Map<String,Object>> list = this.heatSupplyRepository.find(criteria);

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