EF基本操作

一、 EF分页查询

 1 #region EF分页
 2 static void UserPagingQuery (int page, int pageSize) {
 3     var p = page == 0 ? 0 : (page - 1) * pageSize;
 4     DemoDbEntities db = new DemoDbEntities ();
 5     //在分页前先要是用OrderBy或者OrderByDescending对数据进行正序或者倒序
 6     //然后在skip（）跳过多少条，take（）查询多少条。
 7     db.User.OrderBy (u => u.ID)
 8         .Skip (p)
 9         .Take (pageSize)
10         .ToList ()
11         .ForEach (c => Console.WriteLine (c.ID));
12 }
13 #endregion
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二、EF中执行SQL

 1 #region EF中执行SQL语句
 2 
 3 static void EFExecuteSql () {
 4     DemoDbEntities db = new DemoDbEntities ();
 5     string sql = "update [DemoDb].[dbo].[User] set NAME=@name where ID>@id";
 6 
 7     SqlParameter[] p = new SqlParameter[] {
 8         new SqlParameter ("@id", 5),
 9         new SqlParameter ("@name", "王五")
10     };
11     db.Database.ExecuteSqlCommand (sql, p);
12     Console.WriteLine ("修改成功");
13 }
14 
15 #endregion
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posted @ 2019-07-23 19:51  iHey  阅读(534)  评论(0)    收藏  举报