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);

秒客网

我的EntityFramework（2）：简单的数据查询

常见的数据集查询

拼接SQL字符串执行查询

相关文章