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	源代码改用vs默认格式化
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		@@ -17,51 +17,56 @@ namespace dbcontext_01
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    public class Program
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    {
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		public class Song {
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			[Column(IsIdentity = true)]
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			public int Id { get; set; }
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			public string BigNumber { get; set; }
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        public class Song
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        {
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            [Column(IsIdentity = true)]
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            public int Id { get; set; }
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            public string BigNumber { get; set; }
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			[Column(IsVersion = true)]//使用简单
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			public long versionRow { get; set; }
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		}
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            [Column(IsVersion = true)]//使用简单
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            public long versionRow { get; set; }
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        }
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		public class SongContext : DbContext {
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        public class SongContext : DbContext
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        {
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			public DbSet<Song> Songs { get; set; }
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            public DbSet<Song> Songs { get; set; }
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			protected override void OnConfiguring(DbContextOptionsBuilder builder) {
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				builder.UseFreeSql(fsql);
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			}
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		}
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		static IFreeSql fsql;
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		public static void Main(string[] args) {
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			fsql = new FreeSql.FreeSqlBuilder()
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				.UseConnectionString(FreeSql.DataType.Sqlite, @"Data Source=|DataDirectory|\dd2.db;Pooling=true;Max Pool Size=10")
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				.UseAutoSyncStructure(true)
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				.UseLazyLoading(true)
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				.UseNoneCommandParameter(true)
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            protected override void OnConfiguring(DbContextOptionsBuilder builder)
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            {
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                builder.UseFreeSql(fsql);
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            }
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        }
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        static IFreeSql fsql;
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        public static void Main(string[] args)
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        {
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            fsql = new FreeSql.FreeSqlBuilder()
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                .UseConnectionString(FreeSql.DataType.Sqlite, @"Data Source=|DataDirectory|\dd2.db;Pooling=true;Max Pool Size=10")
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                .UseAutoSyncStructure(true)
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                .UseLazyLoading(true)
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                .UseNoneCommandParameter(true)
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				.UseMonitorCommand(cmd => Trace.WriteLine(cmd.CommandText))
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				.Build();
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                .UseMonitorCommand(cmd => Trace.WriteLine(cmd.CommandText))
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                .Build();
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			using (var ctx = new SongContext()) {
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				var song = new Song { BigNumber = "1000000000000000000" };
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				ctx.Songs.Add(song);
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            using (var ctx = new SongContext())
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            {
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                var song = new Song { BigNumber = "1000000000000000000" };
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                ctx.Songs.Add(song);
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				ctx.Songs.Update(song);
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                ctx.Songs.Update(song);
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				song.BigNumber = (BigInteger.Parse(song.BigNumber) + 1).ToString();
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				ctx.Songs.Update(song);
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                song.BigNumber = (BigInteger.Parse(song.BigNumber) + 1).ToString();
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                ctx.Songs.Update(song);
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				ctx.SaveChanges();
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                ctx.SaveChanges();
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				var sql = fsql.Update<Song>().SetSource(song).ToSql();
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			}
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                var sql = fsql.Update<Song>().SetSource(song).ToSql();
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            }
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			CreateWebHostBuilder(args).Build().Run();
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		}
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            CreateWebHostBuilder(args).Build().Run();
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        }
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        public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
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            WebHost.CreateDefaultBuilder(args)
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