我的EntityFramework（2）：简单的数据查询

原文:我的EntityFramework（2）：简单的数据查询

在上一篇博文中，已经搭建了基本的框架，接下来就进行简单的数据查询，这里主要用了Linq

常见的数据集查询

            var companyList = from c in dbs.Company
                              where c.ID > 417154
                              orderby c.CompanyName descending
                              select new { c.ID, c.CompanyName, c.Email, c.HtmlUrl };
            gvList.DataSource = companyList.ToList();//类型转换
            gvList.DataBind();

拼接SQL字符串执行查询

 using (var dbs = new Movie_DBEntities1())
            {
                string sql = "select [Title] from Movie";
                var objList2 = dbs.Database.SqlQuery<string>(sql);//此语句，仅支持单列多行的查询
                foreach (var item in objList2)
                {
                    Response.Write(item + "<br>");
                }
            }

下面属于转载的

EF中使用语句 或存储过程 查询 

1、无参数查询

var model = db.Database.SqlQuery<UserInfo>("select* from UserInfoes ").ToList();

 

2、有参查询

var model = db.Database.SqlQuery<UserInfo>("select* from UserInfoes where id=@ID ",new SqlParameter("@ID",id)).ToList();

 

3、结合linq查询

 

var model = (from p in db.userinfo.SqlQuery("select * from UserInfoes where id=@ID",new SqlParameter("@ID", 1)) select p).ToList();

 

4：EF原始查询单独表

 

model = db.userinfo.OrderByDescending(a => a.ID).Skip(10 * (当前页 - 1)).Take(10).ToList();

 

 

5，EF 执行存储过程或delete 删除语句

 

SqlParameter[] para = new SqlParameter[] { 

new SqlParameter("@ID",id)

};

db.Database.ExecuteSqlCommand("delete UserInfoes  where id=@ID", para);

 

存储过程 删除，有几个参数，存储后面要带几个参数以逗号分隔

 

SqlParameter[] para = new SqlParameter[] { 

new SqlParameter("@ID",id)

};

db.Database.ExecuteSqlCommand("sp_Userinfos_deleteByID @ID", para);

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