为什么有参数没有给定值？
public Rollback(string id,string t,string obj)
{
string p;
string sql;
HttpContext context;
getSQL(t, out p, out sql, out context);
if (sql != ""&&p!="")
{
con = new DataBaseConnector(p).CreateConnection();
OleDbCommand com = new OleDbCommand(sql, con);
com.Parameters.Add("@ID", int.Parse(obj));
con.Open();
com.ExecuteNonQuery();
con.Close();
com.Parameters.Clear();
com.CommandText = "DELECT FROM [operation] WHERE ID=@id";
com.Parameters.Add("@id", id);
con = new DataBaseConnector(context.Server.MapPath(@"数据库路径，你懂得")).CreateConnection();
con.Open();
com.ExecuteNonQuery();
com.Dispose();
con.Close();
}
}
private static void getSQL(string t, out string p, out string sql, out HttpContext context)
{
context = System.Web.HttpContext.Current;
switch (t)
{
case "主题":
p = context.Server.MapPath(@"数据库路径，你懂得");
sql = "UPDATE [article] SET [ADelected]='0' WHERE ID=@id";
break;
case "回复":
p = context.Server.MapPath(@"数据库路径，你懂得");
sql = "UPDATE [re] SET [Delected]=0 WHERE ID=@id";
break;
case "投票回复":
p = context.Server.MapPath(@"数据库路径，你懂得");
sql = "UPDATE [re] SET [delected]=0 WHERE ID=@id";
break;
case "投票":
p = context.Server.MapPath(@"App_Data\4sdr564gb.mdb");
sql = "UPDATE [article] SET [delected]=0 WHERE ID=@id";
break;
case "用户":
p = context.Server.MapPath(@"数据库路径，你懂得");
sql = "UPDATE [user] SET [valid]='2001/1/1' WHERE ID=@id";
break;
default:
p = "";
sql = "";
break;
}
}
调用时：
用户代码未处理 System.Data.OleDb.OleDbException
Message="至少一个参数没有被指定值。"
Source="Microsoft JET Database Engine"
ErrorCode=-2147217904
StackTrace:
在 System.Data.OleDb.OleDbCommand.ExecuteCommandTextErrorHandling(OleDbHResult hr)
在 System.Data.OleDb.OleDbCommand.ExecuteCommandTextForSingleResult(tagDBPARAMS dbParams, Object& executeResult)
在 System.Data.OleDb.OleDbCommand.ExecuteCommandText(Object& executeResult)
在 System.Data.OleDb.OleDbCommand.ExecuteCommand(CommandBehavior behavior, Object& executeResult)
在 System.Data.OleDb.OleDbCommand.ExecuteReaderInternal(CommandBehavior behavior, String method)
在 System.Data.OleDb.OleDbCommand.ExecuteNonQuery()
在 CQApplication.classes.Rollback..ctor(String id, String t, String obj) 位置 D:\CQApplication\CQApplication\CQApplication\classes\Rollback.cs:行号 25
在 CQApplication.delected.liOp_ItemCommand(Object sender, ListViewCommandEventArgs e) 位置 D:\CQApplication\CQApplication\CQApplication\delected.aspx.cs:行号 57
在 System.Web.UI.WebControls.ListView.OnItemCommand(ListViewCommandEventArgs e)
在 System.Web.UI.WebControls.ListView.HandleEvent(EventArgs e, Boolean causesValidation, String validationGroup)
在 System.Web.UI.WebControls.ListView.OnBubbleEvent(Object source, EventArgs e)
在 System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args)
在 System.Web.UI.WebControls.ListViewDataItem.OnBubbleEvent(Object source, EventArgs e)
在 System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args)
在 System.Web.UI.WebControls.LinkButton.OnCommand(CommandEventArgs e)
在 System.Web.UI.WebControls.LinkButton.RaisePostBackEvent(String eventArgument)
在 System.Web.UI.WebControls.LinkButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument)
在 System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument)
在 System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData)
在 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
InnerException:
调试发现：
com.Parameters.Count
1
com.Parameters[0]
{@ID}
base {System.Data.Common.DbParameter}: {@ID}
DbType: Int32
Direction: Input
IsNullable: false
OleDbType: Integer
ParameterName: "@ID"
Precision: 0
Scale: 0
Size: 0
SourceColumn: ""
SourceColumnNullMapping: false
SourceVersion: Current
Value: 4 --------------------编程问答-------------------- if (sql != ""&&p!="")
{
con = new DataBaseConnector(p).CreateConnection();
OleDbCommand com = new OleDbCommand(sql, con);
com.Parameters.Add("@ID", int.Parse(obj));
改为id不要@, --------------------编程问答-------------------- 改成这样
com.Parameters.AddWithValue("@ID", int.Parse(obj));
com.Parameters.AddWithValue("@id", id);
--------------------编程问答-------------------- 仍有同样问题。 --------------------编程问答-------------------- com.CommandText = "DELECT FROM [operation] WHERE ID=@id";
你这sql语句是错误的DELECT ？还是select 还是Delete? --------------------编程问答-------------------- 另外你执行
com.ExecuteNonQuery();
之前打印出sql看是什么。
另外，ID=@id也可以写成 [ID]=@id
其他应该没什么错误了 --------------------编程问答-------------------- 仍有同样异常。SQL为：
UPDATE [article] SET [ADelected]='0' WHERE [ID]=@id
补充：.NET技术 , ASP.NET
