- 合并 FreeSql.DbContext 项目至 FreeSql 维护；

Examples/dbcontext_01/Program.cs

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+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.IO;
+using System.Linq;
+using System.Numerics;
+using System.Threading.Tasks;
+using FreeSql;
+using FreeSql.DataAnnotations;
+using Microsoft.AspNetCore;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.Logging;
+
+namespace dbcontext_01
+{
+    public class Program
+    {
+
+		public class Song {
+			[Column(IsIdentity = true)]
+			public int Id { get; set; }
+			public string BigNumber { get; set; }
+
+			[Column(IsVersion = true)]//使用简单
+			public long versionRow { get; set; }
+		}
+
+		public class SongContext : DbContext {
+
+			public DbSet<Song> Songs { get; set; }
+
+			protected override void OnConfiguring(DbContextOptionsBuilder builder) {
+				builder.UseFreeSql(fsql);
+			}
+		}
+		static IFreeSql fsql;
+		public static void Main(string[] args) {
+			fsql = new FreeSql.FreeSqlBuilder()
+				.UseConnectionString(FreeSql.DataType.Sqlite, @"Data Source=|DataDirectory|\dd2.db;Pooling=true;Max Pool Size=10")
+				.UseAutoSyncStructure(true)
+				.UseLazyLoading(true)
+				.UseNoneCommandParameter(true)
+
+				.UseMonitorCommand(cmd => Trace.WriteLine(cmd.CommandText))
+				.Build();
+
+
+			using (var ctx = new SongContext()) {
+				var song = new Song { BigNumber = "1000000000000000000" };
+				ctx.Songs.Add(song);
+
+				ctx.Songs.Update(song);
+
+				song.BigNumber = (BigInteger.Parse(song.BigNumber) + 1).ToString();
+				ctx.Songs.Update(song);
+
+				ctx.SaveChanges();
+
+				var sql = fsql.Update<Song>().SetSource(song).ToSql();
+			}
+
+			CreateWebHostBuilder(args).Build().Run();
+		}
+
+        public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
+            WebHost.CreateDefaultBuilder(args)
+                .UseStartup<Startup>();
+    }
+}