TDengine 时序数据库的 ADO.Net Core 提供程序 Maikebing.EntityFrameworkCore.Taos

 

简介

Entity, Framework, EF, Core, Data, O/RM, entity-framework-core,TDengine

Maikebing.Data.Taos 是一个基于TDengine 的RESTful Connector构建的ADO.Net 提供器。 这将允许你通过.Net Core 访问TDengine数据库。

Maikebing.EntityFrameworkCore.Taos 是一个Entity Framework Core 的提供器， 基于Maikebing.Data.Taos构建。 此功能尚未开发完成， 暂时误作使用。

 

安装使用:

Install-Package Maikebing.Data.Taos -Version 1.0.0

Maikebing.Data.Taos 使用范例

///Specify the name of the database
    string database = "db_" + DateTime.Now.ToString("yyyyMMddHHmmss");
    var builder = new TaosConnectionStringBuilder()
    {
        DataSource = "http://td.gitclub.cn/rest/sql",
        DataBase = database,
        Username = "root",
        Password = "taosdata"
    };
    //Example for ADO.Net 
    using (var connection = new TaosConnection(builder.ConnectionString))
    {
        connection.Open();
        Console.WriteLine("create {0} {1}", database, connection.CreateCommand($"create database {database};").ExecuteNonQuery());
        Console.WriteLine("create table t {0} {1}", database, connection.CreateCommand($"create table {database}.t (ts timestamp, cdata int);").ExecuteNonQuery());
        Console.WriteLine("insert into t values  {0}  ", connection.CreateCommand($"insert into {database}.t values ('{DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss.ms")}', 10);").ExecuteNonQuery());
        Console.WriteLine("insert into t values  {0} ", connection.CreateCommand($"insert into {database}.t values ('{DateTime.Now.AddMonths(1).ToString("yyyy-MM-dd HH:mm:ss.ms")}', 20);").ExecuteNonQuery());
        var cmd_select = connection.CreateCommand();
        cmd_select.CommandText = $"select * from {database}.t";
        var reader = cmd_select.ExecuteReader();
        Console.WriteLine(cmd_select.CommandText);
        Console.WriteLine("");
        ConsoleTableBuilder.From(reader.ToDataTable()).WithFormat(ConsoleTableBuilderFormat.MarkDown).ExportAndWriteLine();
        Console.WriteLine("");
        Console.WriteLine("DROP TABLE  {0} {1}", database, connection.CreateCommand($"DROP TABLE  {database}.t;").ExecuteNonQuery());
        Console.WriteLine("DROP DATABASE {0} {1}", database, connection.CreateCommand($"DROP DATABASE   {database};").ExecuteNonQuery());
        connection.Close();
    }
    //Example for  Entity Framework Core  
    using (var context = new TaosContext(new DbContextOptionsBuilder()
                                            .UseTaos(builder.ConnectionString).Options))
    {
        Console.WriteLine("EnsureCreated");
        context.Database.EnsureCreated();
        for (int i = 0; i < 10; i++)
        {
            var rd = new Random();
            context.sensor.Add(new sensor() { ts = DateTime.Now.AddMilliseconds(i), degree = rd.NextDouble(), pm25 = rd.Next(0, 1000) });
        }
        Console.WriteLine("Saveing");
        context.SaveChanges();
        Console.WriteLine("");
        Console.WriteLine("from s in context.sensor where s.pm25 > 0 select s ");
        Console.WriteLine("");
        var f = from s in context.sensor where s.pm25 > 0 select s;
        var ary = f.ToArray();
        ConsoleTableBuilder.From(ary.ToList()).WithFormat(ConsoleTableBuilderFormat.MarkDown).ExportAndWriteLine();
        context.Database.EnsureDeleted();
    }
    Console.WriteLine("");
    Console.WriteLine("Pass any key to exit....");
    Console.ReadKey();