EF基本操作

一、 EF分页查询

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

二、EF中执行SQL

#region EF中执行SQL语句

static void EFExecuteSql () {
    DemoDbEntities db = new DemoDbEntities ();
    string sql = "update [DemoDb].[dbo].[User] set NAME=@name where ID>@id";

    SqlParameter[] p = new SqlParameter[] {
        new SqlParameter ("@id", 5),
        new SqlParameter ("@name", "王五")
    };
    db.Database.ExecuteSqlCommand (sql, p);
    Console.WriteLine ("修改成功");
}

#endregion