- 合并 FreeSql.DbContext 项目至 FreeSql 维护；

Examples/dbcontext_01/DbContexts/SongContext.cs

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+using FreeSql;
+using FreeSql.DataAnnotations;
+using System;
+using System.Collections.Generic;
+
+namespace dbcontext_01 {
+
+	public class SongContext : DbContext {
+
+		public DbSet<Song> Songs { get; set; }
+		public DbSet<Tag> Tags { get; set; }
+
+		//protected override void OnConfiguring(DbContextOptionsBuilder builder) {
+		//	builder.UseFreeSql(dbcontext_01.Startup.Fsql);
+		//}
+	}
+
+
+	public class Song {
+		[Column(IsIdentity = true)]
+		public int Id { get; set; }
+		public DateTime? Create_time { get; set; }
+		public bool? Is_deleted { get; set; }
+		public string Title { get; set; }
+		public string Url { get; set; }
+
+		public virtual ICollection<Tag> Tags { get; set; }
+
+		[Column(IsVersion = true)]
+		public long versionRow { get; set; }
+	}
+	public class Song_tag {
+		public int Song_id { get; set; }
+		public virtual Song Song { get; set; }
+
+		public int Tag_id { get; set; }
+		public virtual Tag Tag { get; set; }
+	}
+
+	public class Tag {
+		[Column(IsIdentity = true)]
+		public int Id { get; set; }
+		public int? Parent_id { get; set; }
+		public virtual Tag Parent { get; set; }
+
+		public decimal? Ddd { get; set; }
+		public string Name { get; set; }
+
+		public virtual ICollection<Song> Songs { get; set; }
+		public virtual ICollection<Tag> Tags { get; set; }
+	}
+}