国内永久在线免费建站友情链接检测方法
TDengine
是国内比较流的时序库之一，支持群集并且免费，在.NET中资料比较少，这篇文章主要介绍SqlSugar ORM来操作TDengine
优点：
1、SqlSugar支持ADO.NET操作来实现TDengine，并且支持了常用的时间函数、支持联表、分页和批量插入和删等操作
2、使用了原生连接（非http连接 ）保证了TDengine性能
TDengine 连接字符串
Host=localhost;Port=6030;Username=root;Password=taosdata;Database=powerTDengine 客户端SDK安装
当前程序需要安装Sdk才能连接数据库
https://docs.taosdata.com/connector
TDengine Nuegt安装
下面是NUGET安装
SqlSugar.TDengineCore
SqlSugarCore执行SQL
//建库db.Ado.ExecuteCommand("CREATE DATABASE IF NOT EXISTS power WAL_RETENTION_PERIOD 3600");//建超级表db.Ado.ExecuteCommand("CREATE STABLE IF NOT EXISTS MyTable (ts TIMESTAMP, current FLOAT, voltage INT, phase FLOAT) TAGS (location BINARY(64), groupId INT)");//创建子表db.Ado.ExecuteCommand(@"create table IF NOT EXISTS MyTable01 using MyTable tags('California.SanFrancisco',1)");//insert sql//db.Ado.ExecuteCommand(insrtSql);//查询子表var dt = db.Ado.GetDataTable("select * from MyTable01");//查询超级表var dt2 = db.Ado.GetDataTable("select * from MyTable");单表查询
var list2 = db.Queryable<MyTable02>().Where(it => it.name == "测试2").ToList();var list22 = db.Queryable<MyTable02>().Where(it => it.voltage == 222).ToList();var list222 = db.Queryable<MyTable02>().Where(it => it.phase == 1.2).ToList();var list2222 = db.Queryable<MyTable02>().Where(it => it.isdelete == true).ToList();联表查询
//联表查询:不支持left join只能这样var list101= db.Queryable<MyTable02, MyTable02>((x, y) => x.ts == y.ts).Select((x,y) => new{xts=x.ts,yts=y.ts}).ToList();函数用法
//模糊查询var list3 = db.Queryable<MyTable02>().Where(it => it.name.Contains("a")).ToList();//时间差函数 var list31 = db.Queryable<MyTable02>().Select(it =>new{diff = SqlFunc.DateDiff(DateType.Day, it.ts, DateTime.Now),time=it.ts}).ToList();//时间加1天var list32 = db.Queryable<MyTable02>().Select(it =>new{addTime = SqlFunc.DateAdd(it.ts,1, DateType.Day),oldime = it.ts}).ToList();//自定义函数:实现时间加1天var list33 = db.Queryable<MyTable02>().Select(it =>new{addTime =SqlFunc.MappingColumn<DateTime>(" `ts`+1d "),oldime = it.ts}).ToList();分页查询
//分页var Count = 0;var list4 = db.Queryable<MyTable02>().Where(it => it.voltage == 111).ToPageList(1, 2, ref Count);插入
超级表是不能插入的，我们只插入子表
//批量插入子表db.Insertable(GetInsertDatas()).ExecuteCommand();//子表实体public class MyTable02{[SugarColumn(IsPrimaryKey =true)]public DateTime ts { get; set; }public float current { get; set; }public bool isdelete { get; set; }public string name { get; set; }public int voltage { get; set; }public float phase { get; set; }[SugarColumn(IsOnlyIgnoreInsert =true,IsOnlyIgnoreUpdate =true)]//Tags字段禁止插入public string location { get; set; }[SugarColumn(IsOnlyIgnoreInsert = true, IsOnlyIgnoreUpdate = true)]//Tags字段禁止插入public int groupId { get; set; }}删除数据
只能范围删除不能直接等于删除
var count = db.Deleteable<MyTable02>().Where(it => it.ts>time).ExecuteCommand();源码和DEMO
找到TDengineTests文件夹
https://github.com/DotNetNext/SqlSugar
