在数据读取器中没有具有相同名称的对应列 [英] does not have a corresponding column in the data reader with the same name
问题描述
我有一个名为 tbl_search
的表
,其列为: id(int),title( nvarchar100),结果(ntext)
,我想使用 SQL查询
,例如:
使用(var db = new GoogleEntities())
{
const string selectCmd =
@从tbl_search中选择前1个标题其中title = @ title和id = @ id;
var data = db.Database.SqlQuery< tbl_search>(
selectCmd,
新SqlParameter( @ title, wcf),
新SqlParameter( @id,1)
).FirstOrDefault();
if(data!= null)
{
var serviceMember = data.ToString();
label1.Text = serviceMember ==吗? :(serviceMember == True吗? On: Off);
}
}
但它给我一个错误:
数据读取器与指定的 GoogleModel.tbl_search不兼容。类型 id的成员在数据读取器中没有具有相同名称的对应列。
注意:这是我的 tbl_search
类:
公共局部类tbl_search
{
public int id {get;组; }
公共字符串标题{get;组; }
公用字串结果{get;组; }
}
我有 id
您的SQL语句仅返回标题而不是完整实体。 / p>
更改:
从tbl_search中选择前1个标题title = @ title and id = @ id
至:
选择顶部1 *从tbl_search其中title = @ title和id = @ id
I have Table
named tbl_search
with columns : id(int), title(nvarchar100), result(ntext)
and i want using SQL query
, like this :
using (var db = new GoogleEntities())
{
const string selectCmd =
@"Select top 1 title From tbl_search Where title=@title and id=@id ";
var data = db.Database.SqlQuery<tbl_search>(
selectCmd,
new SqlParameter("@title", "wcf"),
new SqlParameter("@id", 1)
).FirstOrDefault();
if (data != null)
{
var serviceMember = data.ToString();
label1.Text = serviceMember == "" ? "" : (serviceMember == "True" ? "On" : "Off");
}
}
but it give me an error :
The data reader is incompatible with the specified 'GoogleModel.tbl_search'. A member of the type, 'id', does not have a corresponding column in the data reader with the same name.
NOTE: this is my tbl_search
class :
public partial class tbl_search
{
public int id { get; set; }
public string title { get; set; }
public string result { get; set; }
}
i have id
in my table.. What is the problem!!
Your SQL Statement only returns the title not the full entity.
Change:
Select top 1 title From tbl_search Where title=@title and id=@id
to:
Select top 1 * From tbl_search Where title=@title and id=@id
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