diff --git "a/\346\262\210\350\202\262\346\236\227/20241212-linq.md" "b/\346\262\210\350\202\262\346\236\227/20241212-linq.md"
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@@ -0,0 +1,4 @@
+```
+  .Take(数字)查询多少个
+  .Skip(数字)跳过多少个
+```
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diff --git "a/\346\262\210\350\202\262\346\236\227/20241213-\346\250\241\345\236\213.md" "b/\346\262\210\350\202\262\346\236\227/20241213-\346\250\241\345\236\213.md"
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+# 模型
+1. 安装 `Entity Framework Core`
+```
+  dotnet add package Microsoft.EntityFrameworkCore.sqlServer
+```
+
+2. 创建实体类型
+
+3. 创建数据库上下文(文件名带 `DbContext`)
+```
+  public class 文件名 : DbContext
+  {
+    public DbSet<实体类型> 数据库表名 {get;set;}
+    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
+    {
+        base.OnConfiguring(optionsBuilder);
+        optionsBuilder.UseSqlServer("server=实例名;database=数据库名;uid=sa;pwd=密码;TrustServerCertificate=True");
+    }
+  }
+```
+
+4. 数据库迁移
+```
+dotnet tool install -g dotnet-ef
+dotnet add package Microsoft.EntityFrameworkCore.Design
+dotnet ef migrations add InitialCreate
+dotnet ef database update
+```
+
+5. 增删改查
+获取数据
+```
+private readonly 数据库上下文名字 实例名;
+public 控制器名称()
+{
+  实例名 = new 数据库上下文名字();
+}
+```
+
+增加数据
+```
+实例名.表名.Add()
+```
+
+删除数据
+```
+实例名.表名.Remove()
+```
+
+修改数据
+```
+实例名.表名.Updata()
+```
+
+增删改后要保存
+```
+实例名.SaveChanges()
+```
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