How Do I .. Use A Dataview To Break Up Sqldatareader ? Please Help!
Feb 8, 2006
Hello,
I am using a sqldatareader to get back a whole set of data.
The columns are id, data_id and data_desc
for example, the collection is
id data_id data_desc
0 100 this is name for id 0
0 101 this is address for id 0
0 102 this is gender for id 0
1 100 this is name for id 1
1 101 this is address for id 1
1 102 this is gender for id 1
2 100 this is name for id 2
2 101 this is address for id 2
2 102 this is gender for id 2
3 100 this is name for id 3
3 101 this is address for id 3
3 102 this is gender for id 3
I want to be able to go thru' this list and break up for each id and create a txt file. So, i will have four text files.
txt0.txt will contain
100, this is name for id 0
101, this is address for id 0
102, this is gender for id 0
I would like to know, how do i use a dataview to break up the sqldatareader so i can then repeat the loop for each id and generate the text file.
I have a report with several matrix objects. The data contained in each matrix is simple. One matrix has one column of labels and a column of data. The other has 3 columns of data. Both matrix's only show about 25 rows of data. A variable amount of data is displayed above the matrix's so that sometime the render across a page boundary. Whenever this happens the matrix doesn't render rows down to the bottom of the page. A considerable amount of empty space is left on the page, the completed matrix is displayed on the next page. I'm wondering how to get the matrix to render in this empty space.
This problem only occurs when I view the report on screen, in the Visual Studio "Preview" window, or from the Report Server web site. Tiff, pdf and printed output doesn't contain the extra space.
I've tried adding my matrix to a List and a Rectangle to see of this would fix the problem but it didn't help.
I've check the dimensions and margins or the page and I don't think I have any sizing problems, everything should fit on the page.
I don't know if this topic should go in this forum category or in the SQLDataSource forum. I need to be able to provide SQL which varies based on what the user enters on a page. However, this isn't as simple a providing parameters in the SQLDataSource control because the SQL changes depending on what the user selects. For example, in a customer search page, they choose to search by either first name or last name from a drop down list and then enter the name to search for in a text box. The dataview should display the matching customers. How can I set this SQL based on the entered values while also keeping the paging and sorting capabilities of the dataview? You don't seem to be able to set the SQL for an SQLDataSource at run time.
In the dataview rowfilter property, how can I say that I just wantTitles that start with 'A' to 'J' ??ex:dv.rowfilter = " Country = ' France ' "I wantdv.rowfilter = " Title = (from 'A' to 'J') "This doesn't work :dv.rowfilter = " Title like '[a-j]%' "Neither does :dv.rowfilter = " Title like 'a%'" AND "Title like 'b%'" AND..so onBut this does work just for the Titles starting with 'a'dv.rowfilter = " Title like 'a%' "any idea ?JMT
I am creating an ad-hoc reporting module for my website. The user may select a list of columns and specify the WHERE for the report. I build the select statement and the where statement and pass the info to a stored procedure. The stored procedure accepts 3 select parameters and a 3 wherestmt parameters. I finally got the SQLDatasource to work by setting the parameter values in the Selecting method of the SQLDatasource. Binding it to a gridview shows me all my values. Now, I am trying to programmatically call the select method of the SQLDatasource so I can get a dataview or datareader to manipulate further. I am getting an null back when I call the select method. Any ideas why? or a workaround? <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:AssetMgmtRWConnectionString %>"SelectCommand="getAdhocRptData" SelectCommandType="StoredProcedure" DataSourceMode="DataReader"> <SelectParameters> <asp:Parameter Name="strSelect" Type="String" /> <asp:Parameter Name="strSelect2" Type="String" /> <asp:Parameter Name="strSelect3" Type="String" /> <asp:Parameter Name="strWhere" Type="String" /> <asp:Parameter Name="strWhere2" Type="String" /> <asp:Parameter Name="strWhere3" Type="String" /> <asp:Parameter Name="bitDebug" Type="Boolean" /> </SelectParameters> </asp:SqlDataSource>
<VB Code>Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load 'Getting an error that the object is null? why is the above code not returning any data? 'Tried using a datareader and datasource.Dim rptview As IDataReader = CType(SqlDataSource1.Select(DataSourceSelectArguments.Empty), IDataReader) If rptview.Read Then lblMsg.Text = "Got Rows" End If End Sub Protected Sub SqlDataSource1_Selecting(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.SqlDataSourceSelectingEventArgs) Handles SqlDataSource1.Selecting 'For this sp, need to set each paramater even if it is not being used. Setting it in the wizard 'does not work. Need to be set programmatically. e.Command.Parameters("@strSelect").Value = "p.field1, p.field2 " e.Command.Parameters("@strSelect2").Value = "s.field1, s.field2" e.Command.Parameters("@strSelect3").Value = "a.field1, a.field2, a.field4, a.field5" e.Command.Parameters("@strWhere").Value = "p.field3 is not null and a.field5 is null" e.Command.Parameters("@strWhere2").Value = "'" e.Command.Parameters("@strWhere").Value = "" e.Command.Parameters("@bitdebug").Value = False End Sub
Hi, I use a filter on a dataview which has uniq rows. I need to bind several fields of the result filtered row to textboxes. Here the code : protected void Page_Load(object sender, EventArgs e) { string id = Request.QueryString["id"]; if (PreviousPage != null) { SqlDataSource dsPrev = (SqlDataSource)PreviousPage.FindControl("SqlDataSource1"); DataView dv = (DataView)(dsPrev.Select(DataSourceSelectArguments.Empty)); dv.RowFilter = "dr_id='" + id + "' "; dv.RowStateFilter = DataViewRowState.CurrentRows; txtFirstName.Text = // ??? FirstName Field txtLastName.Text= // ??? LastName Field txtAddress.Text= // ??? Address Field } } I don't know which cod to put in those lines. On the help of the dataView there is an example that use DataBindings. This example is in the DataView.RowFilter article: Text1.DataBindings.Add("Text",view,"CompanyName"); The big problem is that I don't have a method or event call 'DataBindings'. I just have 'DataBind' method or dataBinding event and they both don't support the 'Add' method. So how can I bound those controls to my filtered Dataview field value. Thanks, David
Question related to Visual Basic Video Lesson 09 (Databinding.wmv) by Bob Tabor.
Made a table and a UI form according to this lesson (table colums: CustomerID, FirstName, LastName).
Is it possible to use the same or an identical looking query form to find "Bob" by typing Bob in the Fist Name textbox or "Tabor" by typing Tabor in the Last Name textbox as in FileMaker?
Hi, I need to create filter which retrieves data for current moment. [time].[date].lastchild is not an option because the calender in database is generated till following year (2008).
I guess script goes like..
[time].[date].currentmember
but it does not work.
I'm green with these MDX scripts.. I'd be very pleased if some one of you gurus could help me.
I have the following SqlDataSource in my page:<asp:SqlDataSource ID="sqlds" runat="server" ConnectionString="<%$ ConnectionStrings:cs %>" SelectCommand="SELECT [Quest1], [Quest2], [Quest3], [Quest4], [Quest5] WHERE ([QuestID] = @QuestID)"> <SelectParameters> <asp:Parameter Name="QuestID" /> </SelectParameters> In my code I get the following error: "Cannot convert type 'int' to 'System.Data.DataView'", I don't understand why I am getting this error because I am casting my SqlDataSource as type DataView when passing it to my DataView type.Code: protected void Chart(string record) { System.Data.DataView dv = (System.Data.DataView)sqlds.SelectParameters.Add("QuestID", System.TypeCode.Int32, record); //Error line ... ... ...}If anyone could point me in the right direction I would be very grateful.
I need access to the underlying DataView associated with a declaratively defined SQLDataSource. Ideally, I need this access in the SQLDataSource's Selected event. I know that I can use the SQLDataSouce.Select() method to return the underlying DataView object. But, there is a GridView control bound to the datasource so I don't want to explicity call Select() since it will end up being called again implicity by the gridview itself. I have seen that this can be done with an ObjectDataSouce as follows: void odsDataSouce_Selected(object sender, ObjectDataSourceStatusEventArgs e) { DataView oDV = (DataView)e.ReturnValue;} Is there any way to accomplish the same thing with a SQLDataSouce? It seems hard to believe that the query results are not exposed to the Selected event. Thanks!
(Hope this isn't a "stupid" question, but I haven't been able to find a straight-forward answer anywhere)" I currently have code that iterates through a dataview's records, making a change to a field in some of the records. The way I have this coded, a conection has to opened & closed for each individual record that's updated: dsrcUserIae.UpdateCommand = "UPDATE UserIAE SET blnCorrect = @blnCorrect WHERE (ID = @ID)" dsrcUserIae.UpdateParameters.Add("blnCorrect", SqlDbType.Bit) dsrcUserIae.UpdateParameters.Add("ID", SqlDbType.Int) Dim myDataView As DataView = CType(dsrcUserIae.Select(DataSourceSelectArguments.Empty), DataView) For Each myRow As DataRowView In myDataView If myRow("FkUsersAnswerID") = myRow("AnswerID") Then intCorrect = 1 Else intCorrect = 0 End If dsrcUserIae.UpdateParameters.Item("blnCorrect").DefaultValue = intCorrect dsrcUserIae.UpdateParameters.Item("ID").DefaultValue = myRow("ID") intUpdateResult = dsrcUserIae.Update() Next It seems like I should be able to do something like this (call update once), but I'm not sure how... dsrcUserIae.UpdateCommand = "UPDATE UserIAE SET blnCorrect = @blnCorrect WHERE (ID = @ID)" dsrcUserIae.UpdateParameters.Add("blnCorrect", SqlDbType.Bit) dsrcUserIae.UpdateParameters.Add("ID", SqlDbType.Int) Dim myDataView As DataView = CType(dsrcUserIae.Select(DataSourceSelectArguments.Empty), DataView) For Each myRow As DataRowView In myDataView If myRow("FkUsersAnswerID") = myRow("AnswerID") Then myRow("blnCorrect") = 1 Else myRow("blnCorrect") = False End If Next intUpdateResult = dsrcUserIae.Update() 'Want all changed myRow("blnCorrect") to be updated to datasource Can anybody explain how to do the bulk update? I've seen some info about AcceptChanges and Merge, but I'm not sure if they apply here, or if they more for Transactions.
Hi all, In my VWD 2005 Express, I created a website "AverageTCE" that had Default.aspx, Default.aspx.vb and App_Code (see the attached code) for configurating a direct SqlDataSource connection to the dbo.Table "LabData" of my SQL Server 2005 Express "SQLEXPRESS" via SqlDataSource, DataView, CType Function and the Page_Load procedure. I executed the website "AverageTCE" and I got Compilation ErrorBC30451: Name 'SqlDataSource3' is not declared:
Server Error in '/AverageTCE' Application.
Compilation Error Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately. Compiler Error Message: BC30451: Name 'SqlDataSource3' is not declared.Source Error:
Line 8: <DataObjectMethod(DataObjectMethodType.Select)> _ Line 9: Public Shared Function SelectedConcentration() As ConcDB Line 10: Dim dv As DataView = CType(SqlDataSource3.Select(DataSourceSelectArguments.Empty), DataView) Line 11: dvConcDB.RowFilter = "Concentration = '" & ddlLabData.SelectedValue & "'" Line 12: Source File: C:Documents and Settingse1enxshcMy DocumentsVisual Studio 2005WebSitesAverageTCEApp_CodeConcDB.vb Line: 10 //////////--Default.aspx--////////////////////////// <%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server"> <title>SQL DataSource</title> </head> <body> <form id="form1" runat="server">
</div> </form> </body> </html> ///////////--Default.aspx.vb--//////////////////////////////// Partial Class _Default Inherits System.Web.UI.Page End Class ////////////////--App_Code/ConcDB.vb--////////////////////// Imports Microsoft.VisualBasic Imports System.ComponentModel Imports System.Data Imports System.Data.SqlClient Imports System.Data.SqlTypes <DataObject(True)> Public Class ConcDB <DataObjectMethod(DataObjectMethodType.Select)> _ Public Shared Function SelectedConcentration() As ConcDB Dim dv As DataView = CType(SqlDataSource3.Select(DataSourceSelectArguments.Empty), DataView) dvConcDB.RowFilter = "Concentration = '" & ddlLabData.SelectedValue & "'" Dim dvRow As DataRowView = dvConcDB(0) Dim ConcDB As New ConcDB ConcDB.SelectedConcentration = CDec(0)("Concentration") Return ConcDB End Function Call AverageValue (Conc1) Public Shared Function AverageValue(ByVal Conc1 As Decimal) Dim AverageConc As Decimal AverageConc = (Conc1 + 22.0) / 2 Return AverageConc End Function End Class ************************************************************** I have 2 questions to ask: 1) How can I fix this Compilation Error BC30451: Name 'SqlDataSource3' is not declared? 2) I just read MSDN Visual Studio 2005 Technical Article "Data Access in ASP.NET 2.0" and I saw the following thing: Types of Data Sources: SqlDataSouirce: The configuration of a SqlDataSoure is more complex then that of the AccessDataSource, and is intended for enterprise applications that require the features provided by a true database management system (DBMS). I am using the website application in VWD 2005 Express to do the task of extracting data values from the Tables of SQL Server 2005 Express via .NET Framwork, ASP.NET 2.0 and VB 2005 programming. Can VWD 2005 Express be configured to SQL Server 2005 Express (SQLEXPESS) for the SqlDataSource connection and do the data-extraction task via DataView, CType Function and the Page-Load procedure? Please help, respond and answer the above-mentiopned 2 questions. Many Thanks, Scott Chang
Hi.. Every time I want to read any record from data base I read it in dataset for example:SqlConnection con = new SqlConnection(@"Data Source=localhost ;Initial Catalog=university ;Integrated Security=True"); SqlCommand cmd = new SqlCommand("select [User_AuthorityID] from users where [UserID]='" + TextBox1.Text + "' and [UserPassword]='" + TextBox2.Text + "' ", con);SqlDataAdapter adp = new SqlDataAdapter(); adp.SelectCommand = cmd;DataSet ds = new DataSet(); adp.Fill(ds, "UserID");foreach (DataRow dr in ds.Tables["UserID"].Rows) { user_type = dr[0].ToString(); Session.Add("User_AuthorityID", user_type); ......... Is there easier way to read data from data base? How I can use SqlDataReader to do that? Thanks..
Hey All, I have come across a situation with two tables, they are dynamic and the user can add and edit values in the tables so I need to build a dynamic display control. It is all based around an FAQ system I have built. The user can create new FAQ categories (that is one table) then create a new FAQ Question & Answer (that is the second table). The tables are linked by the category id. So now I am trying to display the FAQ section like so. CATEGORY NAME QuestionAnswerQuestionAnswerCATEGORY NAME QuestionAnswerQuestionAnswerCATEGORY NAME QuestionAnswerQuestionAnswer So my idea was to run a loop within a loop. First loop the category name, then within the category name, loop a second time to grab all of the questions & answers within the category id captured from the first loops sql select statement, then proceed to loop the category name again and of course repeat the process until all loops are completed. However I am getting, and I kinda figured I would get an error about my SQLDataReader. Bellow is my code maybe some type of edit or different recommendation is needed. Any help will do, thanks!Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load '--- Database Connection ---Dim sConnStr As String = ConfigurationManager.ConnectionStrings("ConnectionString").ConnectionString Dim cnBKPost As New SqlConnection(sConnStr) '--- End DB Connection ---- '----- FAQ's ------- Dim sql As String = "SELECT category_id, category_name FROM faq_category ORDER BY category_name DESC"Dim cmd As New SqlCommand(sql, cnBKPost) cnBKPost.Open()Dim reader As SqlDataReader = cmd.ExecuteReader() Dim str As New StringBuilder() Dim catid As IntegerDo While reader.Read() '--- Category Titles ----catid = reader("category_id") str.Append("<h2>" & reader("category_name") & "</h2>") '--- End Category Title --- '--- Get FAQ's In Category --- Dim sqlcat As String = "SELECT faq_question, faq_answer FROM tbl_faq WHERE faq_category = '" & catid & "'"Dim cmdcat As New SqlCommand(sqlcat, cnBKPost) Dim readerfaq As SqlDataReader = cmdcat.ExecuteReader()Do While readerfaq.Read() str.Append("<p><font style='font-size:12pt;font-color:#daa520;>'" & reader("faq_question") & "</font><br />")str.Append(reader("faq_answer") & "</p>") str.Append("<br /><br /><br />") Loop readerfaq.Close() '--- End Get FAQ's in Category --- Loop reader.Close() cnBKPost.Close()Me.Literal1.Text = str.ToString() End Sub End Class
i'm using c# and SqlDataReader to simply retrieve data from one column of a database. problem is it's an integer i'm trying to retrieve, and so i'm trying to put it into an int variable, and i get the error "CS0029: Cannot implicitly convert type 'object' to 'int'" . i've looked for an answer for about an hour and every example for the SqlDataReader that i can find deals with strings only or the examples are too complex for me to understand.
there must be an easy way to retrieve this data and put it into an integer! help...
my line of code that creates the error:
int intGuestNum = dtrSelectTotalSessions["online_numSessions"];
Hi, from what I can find, there isn't a way to get the number of rows returned from a SQLDataReader command. Is this correct? If so, is there a way around this? My SQLDataReader command is as follows:Dim commandInd As New System.Data.OleDb.OleDbDataAdapter(strQueryCombined, connInd)Dim commandSQL As New SqlCommand("GetAssetList2", connStringSQL)Dim resultDS As New Data.DataSet()'// Fill the dataset with valuescommandInd.Fill(resultDS)'// Get the XML values of the dataset to send to SQL server and run a new queryDim strXML As String = resultDS.GetXml()Dim xmlFileList As SqlParameterDim strContainsClause As SqlParameter'// Create and execute the search against SQL ServerconnStringSQL.Open()commandSQL.CommandType = Data.CommandType.StoredProcedurecommandSQL.Parameters.Add("@xmlFileList", Data.SqlDbType.VarChar, 1000).Value = strXMLcommandSQL.Parameters.Add("@strContainsClause", Data.SqlDbType.VarChar, 1000).Value = strContainsConstructDim sqlReaderSource As SqlDataReader = commandSQL.ExecuteReader()results.DataSource = sqlReaderSourceresults.DataBind()connStringSQL.Close()And the stored procedure is such:DROP PROC dbo.GetAssetList2;GOCREATE PROC dbo.GetAssetList2(@xmlFileList varchar(1000),@strContainsClause varchar(1000))ASBEGINSET NOCOUNT ONDECLARE @intDocHandle intEXEC sp_xml_preparedocument @intDocHandle OUTPUT, @xmlFileListSELECT DISTINCTAssetsMaster.AssetMasterUID,SupportedFiles.AssetPath,FROM AssetsMaster, OPENXML (@intDocHandle, '/NewDataSet/Table',2) WITH (FILENAME varchar(256)) AS x,SupportedFilesWHEREAssetsMaster.AssetFileName = x.FILENAMEAND AssetsMaster.Extension = SupportedFiles.Extension UNIONSELECT DISTINCTAssetsMaster.AssetMasterUID,SupportedFiles.AssetPath,FROM AssetsMaster, OPENXML (@intDocHandle, '/NewDataSet/Table',2) WITH (FILENAME varchar(256)) AS x,SupportedFilesWHEREAssetsMaster.AssetFileName <> x.FILENAMEAND CONTAINS ((Description, Keywords), @strContainsClause)AND AssetsMaster.Extension = SupportedFiles.ExtensionORDER BY AssetsMaster.Downloads DESCEXEC sp_xml_removedocument @intDocHandle ENDGOHow can I access the number of rows returned by this stored procedure?Thanks,James
How do I tell when there is no more data to read in a SQLDataReader? For example, I have an open datareader that I pass into a function that MIGHT still have a valid row in it when it returns from the function. How do I tell? I can't do a read() because then that current record will go away. I need to be able to tell if there is a current record without doing another read. TIA,
Say I have this SQL query running into an SqlDataReader select TaskName, TaskDescription from tblTasks where TaskID = 5 There are two different ways to get the data out of the reader (maybe more) TaskName.Text = Reader.GetString(0);andTaskName.Text = Reader.GetString(Reader.GetOrdinal("TaskName")); My question is, is there a major difference in terms of efficiency between these two? The second one is definitely more robuts (in a situation where you are calling a stored procedure, and the stored procedure might change, etc) but the first one has fewer operations. Is the increase in robustness of the second one worth the potential performance hit, if any? Thank you, -Madrak
May I know what is the purpose of having SqlDataReader in Example A? I can see the same output when I tried out both. Should I use Example A or Example B? Currently, I'm using Example B since it is lesser code.Example A Dim objDR As SqlDataReader 'Create Data Reader
LoginConn.Open() strSQL = "SELECT CountryID, CountryName FROM Country ORDER BY CountryName " cmd = New SqlCommand(strSQL, LoginConn) objDR = cmd.ExecuteReader() 'Populate the DataReader ddlNationality.DataSource = objDR ddlNationality.DataBind() ddlNationality.SelectedValue = dvUserProfile.Item(0)("Nationality")LoginConn.Close() Example BLoginConn.Open() strSQL = "SELECT CountryID, CountryName FROM Country ORDER BY CountryName " cmd = New SqlCommand(strSQL, LoginConn) ddlNationality.DataSource = cmd.ExecuteReader() 'Populate the DataReader ddlNationality.DataBind() ddlNationality.SelectedValue = dvUserProfile.Item(0)("Nationality")LoginConn.Close()
Hello every one and happy new year... i have a problem with SqlDataReader used in asp.net application: I defined a public object of SqlDataReader and assigned it the resultset of a query, well, this happened ,lets say in page 1# but whan i want to use this datareader in another page it keeps telling my that the reader is closed so i can't abstract information from, regarding that i used it's methods such "Read()" and "NextResult()" but there is no use, what should i do, help me please !!!!!?
Hello im fairly new to ASP.Net and have a problem with an Intranet Page I am creating. In this part of the page I want to retrive a value from an SQL Table based on criteria and then store it as a variable to be used elsewhere on my page. I have tried using the SQL Data reader to retrive the value but somewhere in my code I am going wrong. Can anyone advise me on this please? See code below My Visual Studio debugger has point out that there is a problem with my r = cmd.ExecuteReader() line Oh and the connection to my SQL database is opened further up the page from this code. Dim strSQL As String = "SELECT top 1 OrderID FROM tblStationeryOrder WHERE ORDERMADEBY = '" & lstUsers.SelectedValue & "' ORDER BY OrderID DESC"Dim cmd As New System.Data.SqlClient.SqlCommand cmd.CommandText = strSQLDim r As System.Data.SqlClient.SqlDataReader r = cmd.ExecuteReader()Do While r.Read() Dim OrderID As Integer = r!OrderID Exit Do
I found this tutorial at C# Station called "Reading Data with the SqlDataReader". In my code behind file I followed what I think the tutorial was telling me to do but I keep getting a syntax error near '='
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.Data.SqlClient.SqlException: Line 1: Incorrect syntax near '='. (Line 45: rdr = cmd.ExecuteReader();) Heres my code:
this is my code: and their is an error ,,really dunno where and why coz it seems logical to me :)Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click If RadioButton1.Checked = True Then
Dim admin As Stringadmin = "SELECT * from ADMINISTRATOR where UserName='" & TextBox1.Text & "' and UserPassword='" & TextBox2.Text & "'"
Dim sConnect As String = "Data Source=.SQLEXPRESS;AttachDbFilename=|DataDirectory|Database.mdf;Integrated Security=True;User Instance=True"Dim cnt As New SqlConnection cnt.ConnectionString = sConnect cnt.Open()Dim com As New SqlCommand com.Connection = cnt com.CommandText = adminerror!!>>>>Dim rd As SqlDataReader rd = com.ExecuteReader If rd.Read ThenSession("admn") = rd("UserName")Session("id") = rd("UserID") rd.Close() cnt.Close()Response.Redirect("~/adminpage.aspx") ElseSession("admn") = 0 Label3.Visible = True rd.Close() cnt.Close() End If Else Dim instrct As Stringinstrct = "SELECT * from instructor where name='" & TextBox1.Text & "' and passs='" & TextBox2.Text & "'"
Dim sConnect As String = "Data Source=.SQLEXPRESS;AttachDbFilename=|DataDirectory|Database.mdf;Integrated Security=True;User Instance=True"Dim con As New SqlConnection con.ConnectionString = sConnect con.Open()Dim com As New SqlCommand com.Connection = con com.CommandText = instrctDim r As SqlDataReader r = com.ExecuteReader If r.Read ThenSession("inst") = r("inst_name") r.Close() con.Close()Response.Redirect("~/instructorpage.aspx?id=" & Session("inst")) ElseSession("inst") = 0 Label3.Visible = True r.Close() con.Close() End If End If End Sub ----------------- this is the error line: The data types text and varchar are incompatible in the equal to operator. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.Data.SqlClient.SqlException: The data types text and varchar are incompatible in the equal to operator.... so,,,any suggestions?
I have an sp, which has 2 select statements, so iam using a sqldatareader and binding the data to a dropdown. the first binding is fine, but when i say dataReader.NextResult(), It is null.It says the reader is closed. Can any one tell a work around for this.
error message is, Invalid attempt to call Read when reader is closed. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.InvalidOperationException: Invalid attempt to call Read when reader is closed.Source Error:
Line 77: if (sdr != null) Line 78: { Line 79: while (sdr.Read()) Line 80: { Line 81: ue.UserId = sdr["lecture_usr_id"].ToString();Source File: C:Users aphyrDocumentsVisual Studio 2008ProjectslectureBusinessLogicUserManager.cs Line: 77 I can't understand!!! I try to debuging!!! but, I don't know. please help me!
suppose I have a data reader which is returned by excuting a command "SELECT [xxx], [yyy], FROM [zzz]" , then I reads the data as normal. while I am reading , there is another thread that excute an insert command to that table , does this insertion effect the order of data that I am reading?
I have an SP that returns a result set that contains a tinyint. My problem is that, when I try and access this value using GetInt16 (or 32), I get an error saying that "Specified cast is not valid". TinyInt is 1 byte, or 8 bits. GetInt16 'Gets the value of the specified column as a 16-bit unsigned integer'. I am assuming that this is the root cause of my problem. But, there doesn't seem to be a GetInt8 ?! Any ideas? Thanks, Martin
hi..i am kind of new to asp.net n having trouble with the SqlException error message.. n this code works as 1st page pass the id to second page and the second page took the id to execute the query..i dun know the wer the error occurs..can give a help..Thanks. private void Page_Load(object sender, System.EventArgs e) {
SqlConnection connection = null; SqlCommand command = null; string sqlConnection = null; string sql = null; string ab = null; sqlConnection = ConfigurationSettings.AppSettings["MSQLConnectionString"]; connection = new SqlConnection(sqlConnection); if (!Page.IsPostBack) { try { if (Request.QueryString["categoryID"] == null) { } else { ab= Request.QueryString["categoryID"].ToString(); //getting the id from page that pass this values
sql = "Select groupname, categoryid, description from groups where groups.categoryid=?"; // can this query execute? command = new SqlCommand(sql, connection); connection.Open(); command.Parameters.Add(new SqlParameter("categoryid", ab)); reader = command.ExecuteReader(); // error on here "SqlException" while (reader.Read()) { group.InnerText = reader["groupname"].ToString(); desc.InnerText = reader["description"].ToString();
My query is as follows:Dim CurrentDate As DateCurrentDate = "09/02/2007" MyCommand = New SqlCommand("SELECT RegisterID FROM Registers WHERE RegisterDate = @RegisterDate AND IsMorningRegister = 1", MyConn)MyCommand.Parameters.Add("@RegisterDate", Data.SqlDbType.DateTime)MyCommand.Parameters("@RegisterDate").Value = CurrentDate My DB table is called RegisterDate and is of type DateTime. The record that should be matched is: Register ID: 13 RegisterDate: 09/02/2007 09:00:00IsMorningRegister: TrueIsAfternoonRegister: False But no records are returned. Any idea why?
I am trying to access data using this code: SqlCommand myCommand = new SqlCommand("myStoredProcedure", myConnection); myCommand.CommandType = CommandType.StoredProcedure; myCommand.Parameters.Add(new SqlParameter("@myID", SqlDbType.Int)); myCommand.Parameters["@myID"].Value = myIDValue; myConnection.Open(); myDataReader = myCommand.ExecuteReader(); myTextBox.Text = myDataReader["myColumn"].ToString(); myDataReader.Close(); myConnection.Close(); I get "data reader has no data" error. A problem with the parameter? The stored procedure returns a row when executed from the database explorer. I have used datasets and table adapters up to now as in the data access tutorial on this site Any Ideas?
Hi,I use SqlDataReader to read one row from database and than set some properties to values retrieved like this:string myString = myReader.GetValue(0) // this sets myString to first value in a rowIf, however, I change order of columns returned by stored procedure myString would be set to wrong value. Is there a way to do something like this: string myString = myReader.GetValue["ColumnName"];
Hello, im using sqldatareader to read my data and whenever time i loop through the reader it starts from second row why is that? here is my code:while (reader.Read()){hinfo.Name = reader["_name"].ToString();hi.Add(hinfo);} i look at the database and i have two rows but its reading only the second row, skiping the first row
I am getting a random exception coming out of ADO.NET's SqlDataReader that I can't seem to track down for the life of me. I have put SQL Server and IIS under heavy load, with neither giving me the exceptions except occasionally (they come when there is no load as well). Web Site is built in VS2005 using .NET 2.0. Basically, I have a web page that caches a few tables from a SQL database (about 10 tables are loaded into cache from this page) and the error can come from any of the tables while they are being read from the database randomly. I had assumed it was possible that a timeout was occuring while reading the data but from what the brief results google shows, there would be a different exception thrown it a timeout had occured. Here is the exception that is showing up: System.NullReferenceException: Object reference not set to an instance of an object. at System.Data.SqlClient.SqlDataReader.ReadColumnHeader(Int32 i) at System.Data.SqlClient.SqlDataReader.ReadColumn(Int32 i, Boolean setTimeout) at System.Data.SqlClient.SqlDataReader.GetValueInternal(Int32 i) at System.Data.SqlClient.SqlDataReader.GetValue(Int32 i) at Library.Data.DataProxy.ExecuteStoredProcedure(ArrayList& returnValues, TypeFactory factory) I got the following exception once from the same section of code as well: System.InvalidOperationException: Invalid attempt to FieldCount when reader is closed. at System.Data.SqlClient.SqlDataReader.get_FieldCount() at Library.Data.DataProxy.ExecuteStoredProcedure(ArrayList& returnValues, TypeFactory factory) The code generating these errors is on line 29 below: 1 /// <summary>2 /// Executes a stored procedure that returns values3 /// </summary>4 /// <param name="returnValues">An arraylist of Types</param>5 /// <param name="factory">The Type specific factory</param>6 /// <returns>True if successful, false otherwise</returns>7 public bool ExecuteStoredProcedure(out ArrayList returnValues, TypeFactory factory)8 {9 bool bResult = true;10 SqlDataReader reader = null;11 12 returnValues = new ArrayList();13 MenseType nextType = null;14 15 try16 {17 // Open database connection18 OpenConnection();19 20 // execute SP21 reader = m_sqlCommand.ExecuteReader();22 23 while(reader.Read())24 {25 nextType = factory.CreateInstance();26 27 for(int i = 0; i < reader.FieldCount; i++)28 {29 object val = reader.GetValue(i);30 31 if(DBNull.Value == val)32 val = null;33 34 nextType.SetValue(reader.GetName(i), val);35 }36 37 returnValues.Add(nextType);38 39 } // while40 41 } // @ try42 catch(Exception ex)43 {44 returnValues = null;45 m_LastError = ex.ToString();46 bResult = false;47 48 #if(DEBUG)49 Library.IO.Logging.AddSQLMessage(ex);50 #endif51 52 } // @ catch53 finally54 {55 // close the reader if nessessary56 if (null != reader)57 reader.Close();58 59 // close db connection60 CloseConnection();61 62 } // @ finally63 64 return bResult;65 66 } // ExecuteStoredProcedure() Any input would be greatly appreciated.
