Querying ADO.NET Datasets

TheMSsForum.com: The Microsoft Software Forum

The MSS Forum ‹ Ado
- Archive
  - Biz
  - MCSE
  - CRM
  - Drivers
  - Framework
  - ADO
  - ASP
  - Compact
  - Forms
  - Dotnet
  - C#
  - VB
  - FontpageGen
  - Excel
  - WorkSheet
  - Exchange
  - Setup
  - Fox
  - Fontpage
  - ASP
  - IIS
  - Entourage
  - Money
  - Messanger
  - PocketPC
  - Powerpoint
  - Project
  - Publisher
  - Excel
  - VB
  - Security
  - Portal
  - Services
  - SQLServerDev
  - SVCS
  - SQLServer
  - VB
  - VC
  - MFC
  - ExcelGen

- Previous
  - 1
    - AS400 DB2 I have problem with DB2/400 running on AS/400 R4V5! The OLEDB name IBMDA400 it's doesn't work with server explorer i connect to server and the data arrived (the data arrived is not correct too) but when click on the name of the table VS.net will show console and display some text "MiniDump" then close and restart automatically and it appear like anything used to happen. can anyone descript what happening and how i resolve this prob, or where i can try another better provider? Thx u Tag: Querying ADO.NET Datasets Tag: 59530
  - 2
    - Naming conventions! Hello, I have searched MSDN and cant find any naming conventions for MS SQL Server in the .NET environment. Have I missed it or does not Microsoft have any conventions for this? (table, column, SPROC names and so on) Regards Stefan Hellberg Tag: Querying ADO.NET Datasets Tag: 59525
  - 3
    - Error in inserting in table in data binded form i've used dataform wizard and i have binded every column of my table to the form's controls.but when trying to add a new row to the table an error message is recieved : "column X does not allow nulls" while the related control is binded and filled.why?? can anybody help me? Tag: Querying ADO.NET Datasets Tag: 59524
  - 4
    - strongly typed dataset Hi, I have to add 40 records in 40 tables with my application (using strongly typed dataset). Do I have to use 40 times the "Fill" method before adding each record in the corresponding table ? If not, how can I do to give a new value for the primary key to each record ? thanx, Ced Tag: Querying ADO.NET Datasets Tag: 59523
  - 5
    - [Microsoft][ODBC SQL Server Driver]Incorrect syntax near '\' I'm receiving this error when executing a SQL statement with the connection string below. The exact same code works when "server=MyServer" rather than "MyServer\MSDE1". It appears to be a problem with the instance. Any ideas? [Microsoft][ODBC SQL Server Driver][SQL Server]Line 1: Incorrect syntax near '\'. driver={SQL Server};server=MyServer\MSDE1;database=Main;uid=test;pwd=abc123;Network= dbmssocn;Connect Timeout = 60; *** Sent via Developersdex http://www.developersdex.com *** Don't just participate in USENET...get rewarded for it! Tag: Querying ADO.NET Datasets Tag: 59518
  - 6
    - primary key problem. This is a multi-part message in MIME format. ------=_NextPart_000_00B2_01C347B4.2A87BCD0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I'm new to ADO.NET, I have nonetheless the very ambitious purpose to = write an ADO.NET provider for the FileMaker "DataBase" (or so they say). So far it goes not too bad, but I have one big problem about primary = keys (RECORDID in my particular case). I see that the IDbDataAdapter has 4 members (the update, delete, = insert,select command). I read that a DbAdapter coulad automatically create the corresponding = update/insert/delete during its Update() method using a CommandBuilder, = provided the select command is defined what puzzle me, because I can do it, but I have no idea how to do it in = a generic way is how the insert (from the new line in the dataset) can = be inserted and return back their primary key (RECORDID in this case). Is there a generic method providing such information or should my = DbAdapter write some FIleMaker specific stuff ?=20 And what code will generate the CommandBuilder ? I never use it, I have = no idea .... thanks for reading up to there.. if you have any tip :-) Lloyd ------=_NextPart_000_00B2_01C347B4.2A87BCD0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=3DContent-Type content=3D"text/html; = charset=3Diso-8859-1"> <META content=3D"MSHTML 6.00.2800.1170" name=3DGENERATOR> <STYLE></STYLE> </HEAD> <BODY> <DIV><FONT face=3DArial size=3D2>I'm new to ADO.NET, I have nonetheless = the very=20 ambitious purpose to write an ADO.NET provider for the FileMaker = "DataBase" (or=20 so they say).</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>So far it goes not too bad, but I have = one big=20 problem about primary keys (RECORDID in my particular = case).</FONT></DIV> <DIV><FONT face=3DArial size=3D2>I see that the IDbDataAdapter has 4 = members (the=20 update, delete, insert,select command).</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>I read that a DbAdapter coulad = automatically create=20 the corresponding update/insert/delete during its Update() method using = a=20 CommandBuilder, provided the select command is defined</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2><FONT color=3D#800000>what puzzle = me</FONT>, because=20 I can do it, but I have no idea how to do it in a generic way is how the = insert=20 (from the new line in the dataset) can be inserted and return back their = primary=20 key (RECORDID in this case).</FONT></DIV> <DIV><FONT face=3DArial size=3D2>Is there a generic method providing = such=20 information or should my DbAdapter write some FIleMaker specific stuff ? = </FONT></DIV> <DIV><FONT face=3DArial size=3D2>And what code will generate the = CommandBuilder ? I=20 never use it, I have no idea ....</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>thanks for reading up to = there..</FONT></DIV> <DIV><FONT face=3DArial size=3D2>if you have any tip :-)</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>Lloyd</FONT></DIV></BODY></HTML> ------=_NextPart_000_00B2_01C347B4.2A87BCD0-- Tag: Querying ADO.NET Datasets Tag: 59512
  - 7
    - Timeout Error when insert data into Database(MSDE) Timeout Error when insert data into Database(MSDE) when I insert data from DataRow to Database(MSDE2000) with ADO.NET , sometime it can insert into the database , but sometime it can not which has an error message "Err no.5 Timeout Expired" [ These events have the same environment and infromation.] In the error case, - The program will show the error dialogbox. - I press OK. button to accept the error message. - I press INSERT [ button ] again. It can be inserted into the database. Dim cn As OleDbConnection Dim command As OleDbCommand = New OleDbCommand() cn = New OleDbConnection (strConnectionString) cn.Open() command.Connection = cn command.CommandText = strInsertCommand command.CommandType = CommandType.Text rowsAffected = command.ExecuteNonQuery() ' The error has been occured in this line. Note :- strInsertCommand ="INSERT INTO testTable (id,Person_id,USNumber,UAddress,UnitType,SNumber,Stype,User Type,CName,Notes,DL_id,Priority,Stime,HB) VALUES ( 1994, 17, 0, 0, 0,N'43532', 2, 1,N'435435435',N'43543543', 1,NULL, 0, 1)" I try to solve this problem by set the connectionstring with Connect TimeOut= 60. However It will be an error within 40 seconds. Comment : UPDATE and DELETE statement Its have no error. Can anyone help me please? Best Regards Awi Tag: Querying ADO.NET Datasets Tag: 59511
  - 8
    - Retrieving row info Hi! I learned how to use Adapters to create a Connection and retrieve a Dataset based on a query using the VB control tools on the Data toolbar. Now, if I don't have any fields to display the info, how would I go about to go into my dataset, and check to see if my query returned a value or not. For example, I am building a login system, I run a stored procedure based on the parameters login and password inside the DataAdapter and create a Dataset. Now where do I go from there. I want to check the results and compare it to the fields entered by the users in the text boxes to see if they match. Sorry for asking so much, I am in the process of learning and I bought David Sceppa book, but I don't seem to find many examples using the graphical DataAdapter. Hope someone can help, I know it's really basic stuff but if I learn it well from the begining I will be able to learn it well. Thanks so much in advance, Teo Tag: Querying ADO.NET Datasets Tag: 59474
  - 9
    - executenonquery error Hello Everyone, I am at my wits end with this problem, and any help would be appreciated. I have a web app which contains a keywords textbox that the user enters terms into. I am trying to validate that the terms entered are in a thesaurus I have stored in a SQLServer 2000 database. What I have done is gather the terms entered in the textbox into an array. I split the array and use a procedure to check each term against the thesaurus database. My problem is that it works for the first term I check (i.e. the first element in the array) but doesnt for the second, third, etc. term. I've checked and the new term is going into the input parameter each time, but beyond that...nothing. Any ideas???? The procedure in SQLServer 2000: CREATE PROCEDURE thes_check @STHES varchar(50), @RESULT varchar(50) OUTPUT AS set nocount on SELECT @RESULT = (select distinct term FROM term WHERE term = @STHES) GO The VB.NET code: Dim i As String = txtSubject.Text Dim a() As String Dim j As Integer Dim subject As String i.ToLower() i.Trim() a = i.Split(",") For j = 0 To a.GetUpperBound(0) 'Response.Write(a(1)) 'create the connection for a datareader Dim strconn As String = "blahblahblah" Dim cnSqlServer As New SqlClient.SqlConnection(strconn) Dim cmdSqlServer As New SqlClient.SqlCommand() Dim prmSQLPar As SqlClient.SqlParameter Dim thesterm As String With cmdSqlServer .Connection = cnSqlServer .CommandText = "thes_check" .CommandType = CommandType.StoredProcedure End With prmSQLPar = cmdSqlServer.Parameters.Add("@STHES", a(j)) prmSQLPar.Direction = ParameterDirection.Input prmSQLPar.SqlDbType = SqlDbType.VarChar prmSQLPar = cmdSqlServer.Parameters.Add("@RESULT", Nothing) prmSQLPar.Direction = ParameterDirection.Output prmSQLPar.SqlDbType = SqlDbType.VarChar prmSQLPar.Size = 250 cnSqlServer.Open() cmdSqlServer.ExecuteNonQuery() cmdSqlServer.Cancel() cnSqlServer.Close() Response.Write("Input: " & CheckNull(cmdSqlServer.Parameters("@STHES").Value)) Response.Write("Output: " & CheckNull(cmdSqlServer.Parameters("@RESULT").Value)) Next Tag: Querying ADO.NET Datasets Tag: 59469
  - 10
    - Populate each column of a datatable from a different oledbprovider Hello, Is it possible in ADO.NET to populate each column of a datatable from a different oleDBprovider. I mean, if I define a datatable with 5 columns. First column should be populated from a sybase data source. Second from a SQL server , third from a XML file. Also based on the data populated in this way, I need to make 4th and 5th columns as calculated columns based on data in first three columns. The data for 4th column should be something like this: Round(ColData_1,2) + (ColData_2-ColData_3)/2 Any help on this would be great.. Thanks -Mahesha Tag: Querying ADO.NET Datasets Tag: 59468
  - 11
    - Copy a datacolumn - Most code done, Missing one thing though.... Hello, I am trying to copy a datacolumn from a good table, and append it to an incoming table that needs to be modified. This incoming table has data, and I would rather not copy each property one by one, Is thier a way to get the propertyinfo stuff to work were I can read the property of a datacolumn, and set it on a new datacolumn...Here is were I am at in Code: If Not (TBL.Columns.Contains(DC.ColumnName)) Then Dim DCNEW As New DataColumn Dim T As Type T = DC.GetType Dim Pi As System.Reflection.PropertyInfo For Each Pi In T.GetProperties(System.Reflection.BindingFlags.Public Or System.Reflection.BindingFlags.Instance) Dim result As Object If Pi.CanWrite Then Try result = Pi.GetValue(DC, System.Reflection.BindingFlags.Public Or Reflection.BindingFlags.Instance Or Reflection.BindingFlags.GetProperty, Nothing, Nothing, Nothing) '********Now that I havge the result, how do I get it back into the new datacolumn? Catch Debug.WriteLine(Pi.Name & " = " & "Can't get Value") End Try End If Next TBL.Columns.Add(DC) End If Thanks to anyone who can help me with this. Cade Tag: Querying ADO.NET Datasets Tag: 59465
  - 12
    - How to pass a 'null' value to INSERT Hi, I use a SqlDataAdapter to add a row to a table. I want to set one column value to be 'null' but it did not show '<null>' on the data grid after I run the app. It only shows an empty space on the datagrid cell instead of a '<null>'. The following is my call to set the null value for the 'Date'. Thanks for help, CT DataSet ds = new DataSet("Info"); adapter.Fill(ds, "Info"); DataTable tbl = ds.Tables["Info"]; DataRow row = tbl.NewRow(); row["Id"] = sID; row["Date"] = null; tbl.Rows.Add(row); adapter.Update(ds, "Visitor_Info"); Tag: Querying ADO.NET Datasets Tag: 59457
  - 13
    - Truncate function??? Does anybody know if there is a similiar function in MS Access like the ORACLE "TRUNCATE" function? eg: trunc(RSS_TRACKING.COMPLETION_DATE) AS COMPLETION_DATE result is: 6/29/03 The truncate function basically will aggregate dates (which I have in my GROUP BY clause) based off of a common starting point, like every Sunday, for instance. I tried using ROUND, but it seems only for numbers, not dates. I also tried using the CONVERT and CAST functions in addition to the ROUND function, but still couldn't do the date conversion. Thanks, Bill....... Tag: Querying ADO.NET Datasets Tag: 59454
  - 14
    - Reflection with SqlConnection I am using reflection to create a data access component. I have the following code: SqlConnection o_Temp = new SqlConnection(); System.Data.IDbConnection o_Connection; o_Connection = o_Temp as IDbConnection; This works correctly but it does not use reflection. Now I am looking to use this code: System.Reflection.Assembly o_Assembly = System.Reflection.Assembly.LoadWithPartialName("System.Data"); object o_Temp2 = o_Assembly.CreateInstance("System.Data.SqlClient.SqlConnection"); System.Data.IDbConnection o_Connection; o_Connection = o_Temp2 as IDbConnection; This does not work as o_Connection is null when it attempts to cast. Any idea why this would be? Thanks in advance! Tag: Querying ADO.NET Datasets Tag: 59453
  - 15
    - Dataset Relations I have a DataSet containing 2 tables, one a header table and the other a detail table. They are related by 3 fields, MrNbr, DocNbr, and TimeStamp. How do I set up a DataSet Relationship based on all 3 of these? I see and understand the examples using just one field but cannot determine from that how to incorporate three fields. Any help is greatly appreciated. Robert Tag: Querying ADO.NET Datasets Tag: 59442
  - 16
    - Crystal reports help! I have an existing crystal report, and I want to integrate it into a new app that receives data as a dataset from a webservice. My question is how do I get the report into the app and assign the datasource at runtime? I would like to do everything in code so I can dynamically access multiple reports down the line in the development cycle. The report was originally designed for direct access to a MSAccess database. I am not very familiar with oledb yet.. I have tried inserting the viewer control, and then adding the report, but when I attempt to run the program with ado.net code accessing the database, it tries to bring up the report which of course does not work because of the use of workgroup security files. this is a huge headache.. can anybody help? Tag: Querying ADO.NET Datasets Tag: 59441
  - 17
    - OleDbDataAdapter won't update database from dataset Armin Zingler of microsoft.public.dotnet.languages.vb says this issue should be more appropriately addressed by microsoft.public.dotnet.framework.adonet. I cannot get my OleDbDataAdapter to update my database table from my local dataset table. The Knowledge Base doesn't seem to help - see item 10 below. I have a Microsoft Access 2000 database which indexes computer magazine articles for personal reference. I am developing a Visual Basic.NET program whose sole purpose is to enter new records into the database. No updates to existing entries, no deletions, and no display of existing records will be performed by this program; only the entry of new records. 1. I use the following code to attempt the update (CRLF is pre-coded - see item 9 below): Try OleDbDataAdapterArticles.Update _ (DsInfoBase, "Articles") ' An unhandled exception of type ' System.Data.OleDb.OleDbException ' occurs in system.data.dll Catch ex As Exception MsgBox("Type = " & _ ex.GetType.ToString() & CRLF & _ "Message = " & ex.Message, _ MsgBoxStyle.OKOnly, _ "Try-Catch Mechanism") End Try It reports: Type = System.Data.OleDb.OleDbException Message = Syntax error in INSERT INTO statement. 2. However, the INSERT INTO statement was automatically generated by the IDE when the OleDbDataAdapterArticles was created. For your reference, that INSERT INTO statement is: INSERT INTO Articles (Author1, Author2, Author3, bkTitleID, catCode1, catCode2, catCode3, catCode4, catCode5, catCode6, catCode7, catCode8, [Date], Location, magTitleID, miscTitleID, Month, Notes, [Number], PageEnd, PageStart, Title, Type, Volume, Year) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ? , ?, ?, ?, ?, ?) and the data adapter's corresponding SELECT statement is: SELECT artTitleID, Author1, Author2, Author3, bkTitleID, catCode1, catCode2, catCode3, catCode4, catCode5, catCode6, catCode7, catCode8, [Date], Location, magTitleID, miscTitleID, Month, Notes, [Number], PageEnd, PageStart, Title, Type, Volume, Year FROM Articles 3. Also for your reference, the schema for the Articles table (the only table being updated) is: artTitleID AutoNumber Primary Key Title Text 128 Default = "No Title ???" Author1 Text 32 Default = " " Author2 Text 32 Default = " " Author3 Text 32 Default = " " Type Text 4 Default = "misc" bkTitleID LongInteger Default = 0 magTitleID LongInteger Default = 0 Foreign Key = Magazines.magTitleID miscTitleID LongInteger Default = 0 Year LongInteger Default = 2003 Month LongInteger Default = 18 Date LongInteger Default = 0 PageStart Text 4 Default = " " PageEnd Text 4 Default = " " Volume Text 4 Default = " " Number Text 4 Default = " " Location Text 128 Default = "MDJ Library" Notes Memo Default = " " catCode1 Text 16 Default = " " Foreign Key = Categories.catCode catCode2 Text 16 Default = " " Foreign Key = Categories.catCode catCode3 Text 16 Default = " " Foreign Key = Categories.catCode catCode4 Text 16 Default = " " Foreign Key = Categories.catCode catCode5 Text 16 Default = " " Foreign Key = Categories.catCode catCode6 Text 16 Default = " " Foreign Key = Categories.catCode catCode7 Text 16 Default = " " Foreign Key = Categories.catCode catCode8 Text 16 Default = " " Foreign Key = Categories.catCode The schema for the referenced Magazines table is: magTitleID LongInteger Primary Key Title Text 64 PubName Text 32 PubCity Text 32 And the schema for the referenced Categories table is: catCode Text 16 Primary Key catTitle Text 255 supCatCode Text 8 4. Before attempting the above update, I use the following code to display the data from the newly created row in the local dataset's table (DsInfoBase.Articles): Dim rowCount As Integer Dim xc As Integer xc = 1 rowCount = DsInfoBase.Articles.Rows.Count() MsgBox("Row Count = " & rowCount.ToString _ & CRLF & "artTitleID = " & _ DsInfoBase.Articles.Rows _ (rowCount - xc).Item("artTitleID") & CRLF _ & "Title = " & DsInfoBase.Articles.Rows _ (rowCount - xc).Item("Title") & CRLF _ & "Author1 = " & DsInfoBase.Articles.Rows _ (rowCount - xc).Item("Author1") & CRLF _ & "Author2 = " & DsInfoBase.Articles.Rows _ (rowCount - xc).Item("Author2") & CRLF _ & "Author3 = " & DsInfoBase.Articles.Rows _ (rowCount - xc).Item("Author3") & CRLF _ & "Type = " & DsInfoBase.Articles.Rows _ (rowCount - xc).Item("Type") & CRLF _ & "bkTitleID = " & DsInfoBase.Articles.Rows _ (rowCount - xc).Item("bkTitleID") & CRLF _ & "magTitleID = " & DsInfoBase.Articles.Rows _ (rowCount - xc).Item("magTitleID") & CRLF & _ "miscTitleID = " & DsInfoBase.Articles.Rows _ (rowCount - xc).Item("miscTitleID") & CRLF _ & "Year = " & DsInfoBase.Articles.Rows _ (rowCount - xc).Item("Year") & CRLF _ & "Month = " & DsInfoBase.Articles.Rows _ (rowCount - xc).Item("Month") & CRLF _ & "Date = " & DsInfoBase.Articles.Rows _ (rowCount - xc).Item("Date") & CRLF _ & "PageStart = " & DsInfoBase.Articles.Rows _ (rowCount - xc).Item("PageStart") & CRLF _ & "PageEnd = " & DsInfoBase.Articles.Rows _ (rowCount - xc).Item("PageEnd") & CRLF _ & "Volume = " & DsInfoBase.Articles.Rows _ (rowCount - xc).Item("Volume") & CRLF _ & "Number = " & DsInfoBase.Articles.Rows _ (rowCount - xc).Item("Number") & CRLF _ & "Location = " & DsInfoBase.Articles.Rows _ (rowCount - xc).Item("Location") & CRLF _ & "Notes = " & DsInfoBase.Articles.Rows _ (rowCount - xc).Item("Notes") & CRLF _ & "catCode1 = " & DsInfoBase.Articles.Rows _ (rowCount - xc).Item("catCode1") & CRLF _ & "catCode2 = " & DsInfoBase.Articles.Rows _ (rowCount - xc).Item("catCode2") & CRLF _ & "catCode3 = " & DsInfoBase.Articles.Rows _ (rowCount - xc).Item("catCode3") & CRLF _ & "catCode4 = " & DsInfoBase.Articles.Rows _ (rowCount - xc).Item("catCode4") & CRLF _ & "catCode5 = " & DsInfoBase.Articles.Rows _ (rowCount - xc).Item("catCode5") & CRLF _ & "catCode6 = " & DsInfoBase.Articles.Rows _ (rowCount - xc).Item("catCode6") & CRLF _ & "catCode7 = " & DsInfoBase.Articles.Rows _ (rowCount - xc).Item("catCode7") & CRLF _ & "catCode8 = " & DsInfoBase.Articles.Rows _ (rowCount - xc).Item("catCode8") & CRLF, _ MsgBoxStyle.OKOnly, "Temporary Check") An inspection of the information displayed in the msgBox shows that everything seems okay. 5. To double-check, I then use the following code: Dim i As Integer Dim HC As String Dim HE As String Dim ErrRec As String Dim TE As DataTable Dim RE As DataRow() Dim CE As DataColumn HC = "No Changes" HE = "No Errors" ErrRec = "" If DsInfoBase.HasChanges Then HC = "Changes" If DsInfoBase.HasErrors Then HE = "Errors" For Each TE In DsInfoBase.Tables If TE.HasErrors Then RE = TE.GetErrors For i = 0 To RE.Length For Each CE In TE.Columns ErrRec = ErrRec & CE.ColumnName & _ " " & RE(i).GetColumnError(CE) _ & CRLF Next RE(i).ClearErrors() Next End If Next End If End If ErrRec = HC & CRLF & HE & CRLF & ErrRec MsgBox(ErrRec, MsgBoxStyle.OKOnly, _ "Record of Errors") It reports: Changes No Errors from which I conclude that the data has been successfully entered into the local dataset's table but the OleDbDataAdapter is failing to update the database from the dataset for some reason I can't figure out. 6. FYI, I am using Microsoft Access 2000 (9.0.3821 SR-1) and Visual Basic.NET(Microsoft Development Environment 2002 Version 7.0.9466, Microsoft .NET Framework 1.0 Version 1.0.3705) running under Microsoft Windows 2000 Professional (5.0.2195, Service Pack 3, Build 2195) on a Dell Optiplex GX400 (P4, 1.3 GHz, 512 MB RAM, 37.2 GB HD). 7. After designing the form layout, I went to Server Explorer and dragged the Articles table to the form, thus creating OleDbConnection1 and OleDbDataAdapterArticles. From the DataAdapter, I generated the DsInfoBase dataset. 8. I then dragged the two reference tables to the form, thus creating OleDbDataAdapterMagazines and OleDbDataAdapterCategories. I added the corresponding local tables to the DsInfoBase dataset. I created several dataviews based on the two reference tables and bound them to listboxes on the form. The form includes an "Add Record" button to execute the addition of the new row to the Articles table. The following code performs the transfer of information from the form to the local dataset's Articles table: ' Update the Local Articles Table Dim drN As DataRow = _ DsInfoBase.Articles.NewRow() drN("Title") = HTitle drN("Author1") = HAuthor1 drN("Author2") = HAuthor2 drN("Author3") = HAuthor3 drN("Type") = HType drN("bkTitleID") = HBkTitleID drN("magTitleID") = HMagTitleID drN("miscTitleID") = HMiscTitleID drN("Year") = HYear drN("Month") = HMonth drN("Date") = HDate drN("PageStart") = HPageStart drN("PageEnd") = HPageEnd drN("Volume") = HVolume drN("Number") = HNumber drN("Location") = HLocation drN("Notes") = HNotes drN("catCode1") = HCatCode1 drN("catCode2") = HCatCode2 drN("catCode3") = HCatCode3 drN("catCode4") = HCatCode4 drN("catCode5") = HCatCode5 drN("catCode6") = HCatCode6 drN("catCode7") = HCatCode7 drN("catCode8") = HCatCode8 DsInfoBase.Articles.Rows.Add(drN) 9. CRLF = Chr(13) & Chr(10) This is a personal idiosyncrasy - I prefer this to using the constant vbCrLf because it's sometimes convenient when generating certain files for Linux servers. 10. The Knowledge Base doesn't seem to have much on this. I used various search terms including keyword searches on kbADONET and kbVBNET. The few articles I found (301248, 308055, 316323, and 326602) indicate that I'm using the proper update statement format. The microsoft.public.dotnet.languages.vb, microsoft.public.dotnet.framework.adonet, and other newsgroups don't seem to address this either (at least, I haven't been able to find anything). M. David Johnson Director of Information Technology Illinois Racing Board david_johnson@irb.state.il.us File c:\work\word work\20030709dbProblem.rtf Posted to: microsoft.public.dotnet.languages.vb 2003/07/09 14:05 CDT - Recorded at 12:08 Posted to: microsoft.public.dotnet.framework.adonet 2003/07/10 09:10 CDT Tag: Querying ADO.NET Datasets Tag: 59431
  - 18
    - Accessing db with Workgroup file Help! I need to pull data from an access database that uses a workgroup security file (mycomp.mdw). The database is also a previous version of microsoft Access... I cannot convert it because it is in use by a VB6.0 application for which I do not have the source code. I would like to programmatically access the data in that database for other functions without disturbing the existing security. I have all of the valid passwords and such, I just need some assistance getting into it. Please email me at nektoinphx@yahoo.com Tag: Querying ADO.NET Datasets Tag: 59426
  - 19
    - Property Binding I have the following: a combo box, cboPrinterType a DataSet, dsPrinterTypes a second DataSet, dsPrinter I want to have the combo box list the values in dsPrinterTypes, so I have set the DisplayMember and Data Source - this works Next I want to have the selected item in the combo box bound to dsPrinter - this does not work. I have tried the following: cboPrinterType.DataBindings.Add("Text", dsPrinter.Tables(0), "printer_type") cboPrinterType.DataBindings.Add("SelectedItem", dsPrinter.Tables(0), "printer_type") cboPrinterType.DataBindings.Add("SelectedValue", dsPrinter.Tables(0), "printer_type") None of which work. The displayed items & values listed in the combo are text. Any suggestions? TIA, Jeremy Tag: Querying ADO.NET Datasets Tag: 59424
  - 20
    - ADO.net and datasets question? Hello, Currently I have a sql server 2000 stored proc which executes queries to return historical data for a number of financial bonds in the following format. Date OutputCol1 OutputCol2 OutputCol3 --------------------------------------------- 1/1/90 3.2938 90.2930 94.019 1/2/90 3.2938 90.2930 94.019 The underlying query in the stored proc which returns the data as above is in the following format. Select a.CurveDate as Date, b.TblCol1 as OutputCol1, c.TblCol2 + d.TblCol3 + log(e.TblCol4) as OutputCol2 Each of these TblCols are retrieved from a different table based on the joins on the Date field across all the tables. As of now all these tables are within a single SQL server 2000 database. We need to move all the math operations which we are currently doing in stored proc to the middle tier(Either VB or C# class library application). and use database just for retrieving raw data from the tables. Also We need to expand this functionality to get raw data for columns from different data sources like SQL server, Oracle sybase or a xml data file and perform math operations in the middle tier and then return the processed data to the front end. We were thinking of doing it in ADO.net which lets us get each of the raw data columns(without math experessions) into different oledbadapters and them filling each into a dataset. I need to know if it is possible to execute join queries on different tables of a dataset. Also I want to perform math operations like dataset.tables(0).columns(1) + log(dataset.tables(1).columns(2)). If not do let me know if you have any other suggestions. Thanks -Mahesha Tag: Querying ADO.NET Datasets Tag: 59414
  - 21
    - ado answer to TableDefs Can anyone tell me what the code is to replicate the Access TableDefs collection? For instance I can code the following to get table data: Dim db as DAO.database Dim tdf as DAO.TableDef set db = currentDb() For Each tdf In db.TableDefs Debug.Print tdf.Name Next tdf What I want to do is to loop through an Access database and see if a specific table exists and if not create the table, which brings me to my next question. Can I use DDL to create the table? Thanks, Tom Tag: Querying ADO.NET Datasets Tag: 59413
  - 22
    - Data Relations using GUID (uniqueidentifier) I am trying to build a data relationship between two tables in a dataset. I am making the join on fields that are both System.Guid types in .NET and uniqueidentifiers in SQL Server 2000. The join works as expected when used in an SQL query but I get an empty set when I use the join in my dataset. The join was working correctly when we were using integers as the primary key but after changing the data types to GUIDs I am not able to make the join. Has anyone else experienced this kind of problem. Thanks, Andrew Tag: Querying ADO.NET Datasets Tag: 59412
  - 23
    - Getting a list of columns that accept null values Hi, I need to find a way to generate a list of columns that accept null values for a given table. The easiest for me would be to do this through a SELECT statement, but I haven't been able to figure out how. regards Natrajk Tag: Querying ADO.NET Datasets Tag: 59410
  - 24
    - Third party code generation tool for .net Hello, Just wondering if anyone out there has used or can recommend a good third party product for generating the database access layer. I have looked at a product called ORM.Net an Object-Relational Mapping and Code Generation Tool for .NET, which auto-generates a data layer object model based on your database schema. However this product generated only C# code, did not support "ORDER By" and concurrency. If anyone else has come across/used a good product, I would be interested to hear about it. Thanks, Kay. Tag: Querying ADO.NET Datasets Tag: 59407
  - 25
    - MSSQL7 Linked Sever and Foxpro tables We need to combine MSSQL7 tables with Visual FoxPro 6 tables for reporting purposes using Crystal Reports Version 6. The process we follows to create a Linked server is as follows: 1. We create a System DSN using Visual FoxPro Tables (*.dbf) driver and pointing to the directory (Free Table Directory) of the Visual FoxPro tables. 2. In SQL we are creating a Linked Server using the Microsoft OLE DB Provider for ODBC and the DSN as the FoxPro DSN that we have created in 1. 3. Now you should see the FoxPro tables under the Tables section of the Linked Server. After formatting the SQL server and re-Installed Windows 2000 Server SP3 and SQL Server 7.0 SP3, we could create the Linked Server without any problems. After 3 days of work, the linked server's tables were not visible anymore. We tried to re-create the Linked Server as described above, but without any success. Although Linked server is visible, the FoxPro tables are then not visible. It seems that the only way to re-establish the Linked Server is to format the drive. Then it will work properly for a short while. How can we re-create the Linked server without formatting SQL server again? Can anyone tell us what are the prerequisites for Linked Server? Why do the FoxPro Linked Server tables disappear? We are using MSDASQL.DLL version 2.53.6200.0. The Visual FoxPro Tables are all version 6. To create the DSN, we are using Visual FoxPro tables (*.dbf) driver version 6.01.8629.01 Where can we look for errors, as there are no errors reported in the SQL logs? Thanks Tag: Querying ADO.NET Datasets Tag: 59404
- Next
  - 1
    - Ordinal Versus Columnname I need some references to some hard facts to why the Ordinal value is a better choice than the column/field name when extracting information of a row in ADO.NET. Anybody have some good reference with numbers that I can show to someone. Peace, Keith Tag: Querying ADO.NET Datasets Tag: 59402
  - 2
    - Is ADO.NET Microsoft's answer to JDO ? I have some experience in ADO.NET and none in JDO. The articles on JDO (Java Data Objects - I think) though, seem to suggest that it is a new and the 'best yet' attempt at solving the relational-object mismatch. From what I understand, as developer I would really only work with JDO's and link any sort of backend datastore (Relational, object database, files, XML files and database etc) to the JDO and truly code against and object model. The JDO's handle caching, transactions (or makes it very easy for me to manage), instantiating new instances while sorting out id's an various optimizations. I got on this track through an article by Dirk Bartels on DevX 'JDO Brings DB Programming into 21st Century Despite Controversy' (http://www.devx.com/devx/editorial/16373) It all sounds great. In ADO.NET a still work with tables and relations like in a relational model. Strongly typed datasets, and similar commercial attempts such as Deklarit, is actually just mass code generation on an inherantly relational model, and in my view a weak solution for a very big problem. So is ADO.NET Microsoft's answer to JDO ? If not, what is ? Tag: Querying ADO.NET Datasets Tag: 59397
  - 3
    - Timeout Error when insert data into Database(MSDE) Timeout Error when insert data into Database(MSDE) when I insert data from DataRow to Database(MSDE2000) with ADO.NET , sometime it can insert into the database , but sometime it can not which has an error message "Err no.5 Timeout Expired" [ These events have the same environment and infromation.] In the error case, - The program will show the error dialogbox. - I press OK. button to accept the error message. - I press INSERT [ button ] again. It can be inserted into the database. Dim cn As OleDbConnection Dim command As OleDbCommand = New OleDbCommand() cn = New OleDbConnection (strConnectionString) cn.Open() command.Connection = cn command.CommandText = strInsertCommand command.CommandType = CommandType.Text rowsAffected = command.ExecuteNonQuery() ' The error has been occured in this line. Note :- strInsertCommand ="INSERT INTO testTable (id,Person_id,USNumber,UAddress,UnitType,SNumber,Stype,User Type,CName,Notes,DL_id,Priority,Stime,HB) VALUES ( 1994, 17, 0, 0, 0,N'43532', 2, 1,N'435435435',N'43543543', 1,NULL, 0, 1)" I try to solve this problem by set the connectionstring with Connect TimeOut= 60. However It will be an error within 40 seconds. Comment : UPDATE and DELETE statement Its have no error. Tag: Querying ADO.NET Datasets Tag: 59396
  - 4
    - updating a typed dataset (newbie question?) I created a DataGrid and bound a DataView of a typed DataSet to it (i tried with the DataSet as well but i'd rather use the DataView as i'm using it for sorting). I have paging working, sorting and the edit template is cool. When i hit Update i wonder what i have to do to update the database with the user inputted values. Now in a perfect world the datagrid, bound to my view would have a method for updating the selected row of the dataset/view with the templated values. All i had to do is call myDataAdapter.Update(myDataSet) to make the changes in the database. I've been looking for this and i can't seem to find a way to do it though. I found a lot of examples using a string or stored procedure to update the values through a new Command object, but i was wondering why i shouldn't use the automaticly generated update, delete, insert of my typed dataset? To find the row i want to update i'd do something like this myTypedDataRow = myTable.Rows.FindById(selectedId); Now my biggest problem is how do i find the selectedId of the row just edited? I already set the Key on the datagrid, so it knows the key of my datatable, yet all the fancy methods on my DataGridEventArgs (or what it's called - i don't have VS/my project here) all just return the index in the datagrid - so since the Id is not the same as the index in the datagrid i can't use it. Anyone know how to solve this or have a good tutorial on DataGrids? I searched for a good one, but only found very simple examples that didn't cover my problem :( Thanks! Per Tag: Querying ADO.NET Datasets Tag: 59395
  - 5
    - dllregisterserver entry point is not found While i am instaling a new driver, i am getting the error message like dllregisterserver entry point is not found. I don't know how to slove this issue. Can anyone help me in this issue. Thanx in advance. Tag: Querying ADO.NET Datasets Tag: 59392
  - 6
    - Untyped Dataset and Datarows??? Hi, I am having difficulty updating an existing record in a database through an untyped dataset. Can't seem to work out what i am doing wrong, and have had no luck finding any good examples on the net that match what i want to do. Below is my code segment, currently i am getting an error that states "Column 'Code' contains non-unique values" and i don't understand why it's giving it to me, because there is only one record with that code and its the one i am trying to update. Any help would be appreciated. DataRow tblRow ; DataColumn[] pki = new DataColumn[1] ; try { DtlsConnection.ConnectionString = ConnectionPath ; DtlsConnection.Open() ; DtlsCommand.CommandText = "Select * From tbl" ; DtlsCommand.Connection = DtlsConnection ; DtlsAdapter.SelectCommand = DtlsCommand ; DtlsAdapter.Fill(DtlsDs, "tbl") ; pki[0] = SecurityDtlsDs.Tables["tbl"].Columns["Code"] ; pki[0].Unique = true ; DtlsDs.Tables["tbl"].PrimaryKey = pki ; tblRow = DtlsDs.Tables["tbl"].Rows.Find(pCode) ; tblRow.BeginEdit() ; tblRow["Code"] = txtCode.Text ; tblRow["Name"] = txtName.Text ; tblRow["Type"] = txtType.Text ; tblRow.EndEdit() ; DtlsAdapter.Update(DtlsDs, "tbl") ; //DtlsAdapter.Fill(DtlsDs, "tbl") ; } catch (Exception e) { MessageBox.Show(e.Message, "Finwin", MessageBoxButtons.OK, MessageBoxIcon.Error) ; } //Closing the connection DtlsConnection.Close() ; Kind Regards Darryn Ross Tag: Querying ADO.NET Datasets Tag: 59380
  - 7
    - Timeout expired I am continually experiencing this error message while developing and test a simple .net application. The timeout period elapsed prior to obtaining a connection from the pool. This may have occurred because all pooled connections were in use and max pool size was reached. This has only started happening since installing 1.1. I have checked every connection to be sure it is being closed after executing my queries. I have tried reading everything I can about connection pooling. Nothing helps. I have tried monitoring using Performance Counters but the .NET CLR Data performance counters seem to accumulate and are not a correct reflection. Can anyone help me please? Thanks Ros Lee Tag: Querying ADO.NET Datasets Tag: 59370
  - 8
    - Client/Server Samples with Business Logic Layer Sorry for the cross-post, but I didn't know whom to ask.. Are there any samples for a true C/S app (preferably VB, but C# is welcomed) with a middle tier using datasets/datatables similar to the the Fitch/Maher sample w/VB6? The only thing i can find on windowsforms.com & MSDN is TaskVision, which is overly complicated for my needs(dont need to expose data via web services). I have adopted the "MS Building Blocks" data access class, but it's only been used in ASP.Net samples, and would like to continue using it in the BLL. Is this possible? Thanks, Morgan Tag: Querying ADO.NET Datasets Tag: 59363
  - 9
    - Which alternative acheives best performance? VB.NET/SQL Server Using datareader to create objects and populate collections (no datasets involved) Part of my object model looks like this (with corresponding tables in the database with PrimaryKey/ForeignKey relationships) Organisation contains Projects contains Contacts contains Allowances contains Adjustments contains Adjustment Costs Which of the following will provide better performance in terms of downloading data? Read all Projects belonging to the Organisation, then loop through each Project and read all Contracts belonging to the Project,then loop through each Contract and read all allowances belonging to the Contract etc. OR Amend my stored procedures to include multiple joins (up to 6 levels deep) so that I read all Projects belong to the Organisation, then read all Contracts belonging to the Organisation, then read all Allowance belonging to the Organisation etc. The first method means I can create the correct heirarchy as data is read but involves many more calls to server and corresponding open/closing of the reader. The second method involves less (but more complex) calls. In addition, I would need to create a temporary hashtable of each collection in order to find out where objects lower down the model belong Stephen Tag: Querying ADO.NET Datasets Tag: 59360
  - 10
    - Crystal Reports a.. Crystal Reports works only with OLEDB providers? thanks, Tag: Querying ADO.NET Datasets Tag: 59358
  - 11
    - sql server vs msde, how to tell How do I tell if someone is running sql server or msde? the reason I need to know this has to do with the connection strings. When I try to connect to sql server I connect with the name of the server easily with Data Source=mysqlserver. If I want to connect to an msde instance I have to do Data Source=(local)\NETSDK. The problem obvoiusly is that neither works with the other connection string. So I'm trying to figure out how to tell which it is so I can insert the (local)\ or not. any help or advice on alternative solutions to my problem would be greatly appreciated. thanks Tag: Querying ADO.NET Datasets Tag: 59354
  - 12
    - Navigating DataGrids: How to access information in Child Tables I am using a Windows Forms DataGrid to display a DataSet with two tables using a parent / child relationship. I set this up with the following code: parentColumn = ds.Tables["Parent"].Columns["ID"]; childColumn = ds.Tables["Child"].Columns["ID"]; dr = new DataRelation("RelParentChild",parentColumn, childColumn); ds.Relations.Add(dr); grid.SetDataBinding( ds, "Parent" ); * I need to access information from the Child Table when the user double-clicks it. gridWIP.CurrentRowIndex stores the value of the Parent Table and does not change while the Child Table is being displayed. Furthermore, this.BindingContext[ dsWIP, "Child" ] appears to be useless: None of the events fire and the Current & Position values never change. I can probably access the information I need using the MouseDown event & the HitTest, but I need to be able to determine which Table the DataGrid is showing at the time, and I'm not sure how to do that either. Any suggestions or links to futher reading would be appreciated. Sincerely, Greg Persson Tag: Querying ADO.NET Datasets Tag: 59351
  - 13
    - Help: Create schema dynamically from a valid XML string? Hi All I think I am attempting a little chicken before the egg, but I am trying: XmlDataDocument parsedErrorDoc = new XmlDataDocument(); parsedErrorDoc.LoadXml(strXML); //where strXML is a valid xml string string schema = parsedErrorDoc.DataSet.GetXmlSchema(); parsedErrorDoc.DataSet.ReadXmlSchema(schema); So I suppose that the dataset doesn't have a schema to return, correct? Is there anyway to programtically generate a schema from a string of valid xml, then apply said schema to the XmlDataDocument's dataset? Or must I load the XmlDataDocument's dataset with a schema first, at all times? Thanks for any help! Geoff Moller geoff_moller@hotmail.com Tag: Querying ADO.NET Datasets Tag: 59346
  - 14
    - ADODB Hi, In VB6 when using DAO e.t.c, it was often required to call the function DBEngine.Idle, otherwise MS Access took ages to release record locks and basically made concurrent use impossible. Will I suffer the same problems with ADODB in VB.NET? if so is there a correct method to also implement this function. or does good old ADODB do all this for me? Thought I'd enquire as I've found no reference to this and didn't want to be caught out in the later stages of my project.. Another issue I have is that when I save a new record to a database and immediatley populate a listbox, I don't get the new record, it's as if there is a 1 second delay before the data is visible, so I miss it but get the new record if I attempt to populate the listbox again; is this some form of cache issue that I can flush programically. Is there any other advice for potential problems I might get? Below is an example of the coding standard I'm using, so it is made clear how I'm accessing data, as there appears to many ways to achieve the same result. Many Thanks, Merlin Imports ADODB Dim StockRec As New ADODB.Recordset dim Sql as string sql="SELECT * FROM SOMETHING" StockRec = New ADODB.Recordset StockRec.CursorLocation = CursorLocationEnum.adUseServer StockRec.Open(Sql, _ "Provider=Microsoft.Jet.OLEDB.4.0;" & _ "Data Source=\\myserver\mydata.mdb;" & _ "user id=admin;password=;" , _ CursorTypeEnum.adOpenKeyset, LockTypeEnum.adLockOptimistic) Do While Not StockRec.EOF Then '// my data pulled from loop Stockrec.movenext Loop Tag: Querying ADO.NET Datasets Tag: 59345
  - 15
    - updating from one data source to another A common scenario I run into is to grab data from one data source and place it in a dataset, modify the data, and then insert the data into another datasource. The problem is that when I use the SqlDataAdapter's update command it doesn't work because the Row versions are all set to Unchanged or Modified and not New so the insert commands never get run. The row version property is read only so it can't be changed. Is there a good work around for this? Thanks! Jason Tag: Querying ADO.NET Datasets Tag: 59342
  - 16
    - Pass array to pl/sql procedure using .NET OracleClient I am trying to pass an array to an oracle procedure using the OracleClient for .NET. I can't find away to do this/ I have trawled the net and have found a few people trying to do the same thing but no solution. The only solution given was to pass the array as a delimited string, but this is no good for my purposes as the array could get quite large. Thanks in advance for any suggestions Ian Tag: Querying ADO.NET Datasets Tag: 59340
  - 17
    - Navision C5 and ASP.NET (ODBC) Hi I'm developing a hotel booking system, an ASP.NET frontend to C5 3.0. I'm having difficulties connecting to C5 through ODBC. I'm using .NET Framework v1.1 and therefore the System.Data.Odbc Namespace. I'm using the C5ODBC driver for C5 3.0 and have tested it succesfull for for instance Microsoft Excel. When the I call the Open() method on the OdbcConnection the application "stalls" , that is the browser keeps on loading and loading. The data source is a System DSN using the C5ODBC driver. Data sourse settings: Datafile: c:\program files\microsoft navision\c5\c5data.dat Additional Parameters: c:\program files\microsoft navision\c5\ .. and the rest is by default Could have something to with the authorization-schema in .NET (forms, windows, etc.)? Or could it be something to do with my config files?: web.config, machine.config. I have not changede any of them. Is it even know to be possible to connect to C5 from ASP.NET? If the above approach is incorrect or there exists a better way please advice. In case this mail has reached the wrong place for this type of problems, could you please redirect it to someone who could assist me, or some place to find information, please (and please notify me as well). I have searched through newsgroups, asp.net forums, and have not been able to find anything. Best regards Michael Bøcker-Larsen Aalborg University, Denmark Tag: Querying ADO.NET Datasets Tag: 59338
  - 18
    - Ignore Trigger When Updating a Table Using VB.Net Code. I have a table MyTable created in SQl Server 2000 which has a UPDATE trigger to update a temporary table. I do not want UPDATE trigger to be fired when I am updating MyTable in my VB.Net code. Is there any ways to accomplish this? Thanks Tag: Querying ADO.NET Datasets Tag: 59334
  - 19
    - Updated DataSet records as XML Hi, How would you get an XML file out of a DataSet? Inside of the XML file you only want to see updated records from a particular table. Thanks Andrew Tag: Querying ADO.NET Datasets Tag: 59333
  - 20
    - oledbCommandBuilder does not work with Excel (could be a bug) All, I am writting an app pre load excel spreadsheets with lots of data, I want to be abil to use the command builder for easy coding, but it dont seam to work with Excel, I have the following code : OleDbDataAdapter myAd = new OleDbDataAdapter(); myAd.SelectCommand = new OleDbCommand( @"select FIELD_1,FIELD_2,FIELD_3 from [TABLE$]",myCon); OleDbCommandBuilder cb = new OleDbCommandBuilder(myAd); /* IF I UNCOMMENT THIS IT WORKS myAd.InsertCommand = new OleDbCommand( "INSERT INTO [TABLE$] (FIELD_1, FIELD_2, FIELD_3) VALUES (?, ?,?)", myCon ); myAd.InsertCommand.Parameters.Add("@FIELD_1", OleDbType.VarChar, 255,"FIELD_1"); myAd.InsertCommand.Parameters.Add("@FIELD_2", OleDbType.VarChar,255).SourceColumn ="FIELD_2"; myAd.InsertCommand.Parameters.Add("@FIELD_3",OleDbType.VarChar,255).SourceCo lumn = "FIELD_3"; */ myAd.Update(DataSetWithDataIn); Tag: Querying ADO.NET Datasets Tag: 59331
  - 21
    - Remote Access to SQL Server Both my SQL: server and Code where located on the same network in the same domain (actually, on the same computer) and now I need to move my code to a completely different Computer on a different network on a different domain with interent access between the servers. When I change the connection string to make the server the ip of the sql server, I get an error message SQL Server does not exist or access denied. What additional security do I need to set up to access this server remotely? Earl Tag: Querying ADO.NET Datasets Tag: 59330
  - 22
    - .net pet shop problem hi! i have install petshop 3.0 sucessfully but when i run it ,the follow error message occurs ---[SqlException: Login failed for user 'mspetshop'. Reason: Not associated with a trusted SQL Server connection.] System.Data.SqlClient.ConnectionPool.GetConnection (Boolean& isInTransaction) +484 System.Data.SqlClient.SqlConnectionPoolManager.GetPooledCo nnection(SqlConnectionString options, Boolean& isInTransaction) +370 System.Data.SqlClient.SqlConnection.Open() +384 PetShop.SQLServerDAL.SQLHelper.PrepareCommand (SqlCommand cmd, SqlConnection conn, SqlTransaction trans, CommandType cmdType, String cmdText, SqlParameter [] cmdParms) +40 PetShop.SQLServerDAL.SQLHelper.ExecuteReader(String connString, CommandType cmdType, String cmdText, SqlParameter[] cmdParms) +140 PetShop.SQLServerDAL.Account.SignIn(String userId, String password) +114 PetShop.BLL.Account.SignIn(String userId, String password) +148 PetShop.Web.ProcessFlow.AccountController.ProcessLogin (String userId, String password) +37 PetShop.Web.SignIn.SubmitClicked(Object sender, ImageClickEventArgs e) +122 System.Web.UI.WebControls.ImageButton.OnClick (ImageClickEventArgs e) +109 System.Web.UI.WebControls.ImageButton.System.Web.UI.IPostB ackEventHandler.RaisePostBackEvent(String eventArgument) +69 System.Web.UI.Page.RaisePostBackEvent (IPostBackEventHandler sourceControl, String eventArgument) +18 System.Web.UI.Page.RaisePostBackEvent (NameValueCollection postData) +33 System.Web.UI.Page.ProcessRequestMain() +1277 --------- my system is : winxp ' mssql 2000 ' vs.net 2003 i'm sure i install it sucessfully if i forget something to configure ms sql? please give me some idea, thanks~:P Tag: Querying ADO.NET Datasets Tag: 59321
  - 23
    - Differnt behavior of ADO.Net Relation.Nested under 1.1 I have an example from MSDN that seems to have worked under 1.0. It does not under 1.1. This is the survey example found at: http://msdn.microsoft.com/library/default.asp? url=/library/en-us/dnaspp/html/surveysample2.asp The write up found there explains how and why the author must change from code some of the properties of her strongly typed dataset. Her code apparently runs fine on 1.0 but will error at rel.Nested = true when using Net Framework V1.1. Here is her code: Public Class ResponseDataSet Inherits BaseResponseDataSet Public Sub New() MyBase.New() AdjustQuestionPrimaryKey() End Sub Protected Sub New(ByVal info As SerializationInfo,_ ByVal context As StreamingContext) MyBase.New(info, context) AdjustQuestionPrimaryKey() End Sub ' This method sets the primary key for the Question table ' to the Id column drawn from the original data ' rather than the Id column created by the autogenerated code Public Sub AdjustQuestionPrimaryKey() Answer.Constraints.Remove("Question_Answer") Question.Constraints.Clear() Question.PrimaryKey = New DataColumn() {Question.Columns("Id")} Dim fkc As ForeignKeyConstraint fkc = New ForeignKeyConstraint("Question_Answer",_ New DataColumn() {Question.Columns ("Id")},_ New DataColumn(){Answer.Columns ("Question_Id")}) fkc.AcceptRejectRule = AcceptRejectRule.None fkc.DeleteRule = Rule.Cascade fkc.UpdateRule = Rule.Cascade Answer.Constraints.Add(fkc) Relations.Remove("Question_Answer") Dim rel As DataRelation = New DataRelation ("Question_Answer",_ New DataColumn() {Question.Columns ("Id")},_ New DataColumn() {Answer.Columns ("Question_Id")},_ False) rel.Nested = True Relations.Add(rel) End Sub End Class Here is the error thrown when hitting the rel.Nested = True line: A column named 'Answer' already belongs to this DataTable: cannot set a nested table name to the same name. 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.DuplicateNameException: A column named 'Answer' already belongs to this DataTable: cannot set a nested table name to the same name. Tag: Querying ADO.NET Datasets Tag: 59317
  - 24
    - naming a typed dataset table during fill I have a typed dataset with three tables. The names are "SaleCustTable", "SaleInvTable", and "CompanyDetail". when the dataset is filled ie: da.fill(ds) should the table be named with the above names or, should you use . and then the table name or just name them something else? When I used the da.fill(ds.SaleInvTable), I had an error "Failed to enable constraints. One or more rows contain values violating non-null, unique, or a foriegn key constraints" Trying da.fill(ds,"SaleInvTable") returned the same error. Trying da.fill(ds,"inv") returned no error and it did have data. I would assume, because off the errors, the first two methods are not the way to go??? If someone would clear this up, I would appreciate it. Thanks, Roy Tag: Querying ADO.NET Datasets Tag: 59313
  - 25
    - ADO Library Corruption Is there any way to find out whether the ADO.Net library installed on the Deployment PC is working fine. I am developing a workflow application using Exchange server. I have defined some custom properties to folder in exchange WSS. I am able to access them using exchange explorer. But when i try to access the same value using ADO.net functions (e.g. WorkflowSession.Fields) it returns no value. The same functions are working fine on the developemnt PC. I feel the ADO.net library is not working properly. Is there a way to find out? Devesh Aggarwal Tag: Querying ADO.NET Datasets Tag: 59296

Hi,

I am populating data of a Microsoft Project 2000(MPP) file into a
dataset through oleDataAdpter using Microsoft Project 2000 OLEDB
Provider.

The above mentioned MPP OLEDB provider does not support queries with
aggregate functions like sum,avg etc. Now i have the data of the MPP
file in my dataset.

Is it possible to query the datatable in my dataset with aggregate
functions like sum,avg etc. ???

If yes how?? If No is there any round about way to perform above
mentioned aggreagte queries on datasets???

Amol...

Top