DataSet Limitation?

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 - DataGrid Problem I am trying to create and load a datagrid at runtime. I am not having any luck. The Datagrid shows up and one column which is about 50 wide shows up with no header. What am I doing wrong? Here is my code. dgcColLeft1 = new DataGridTextBoxColumn(); dgtsGridLeft = new DataGridTableStyle(); grdLeft = new DataGrid(); // Make the Grid grdLeft.Location = new System.Drawing.Point(6, 6); grdLeft.Size = new System.Drawing.Size(300, 300); grdLeft.Dock = DockStyle.Fill; grdLeft.CaptionVisible = false; grdLeft.DataMember = ""; grdLeft.DataSource = dv; //dataview grdLeft.Name = "GridLeft"; grdLeft.TableStyles.Add(dgtsGridLeft); // add table styles // make the styles dgtsGridLeft.DataGrid = this.grdLeft; dgtsGridLeft.MappingName = "Services"; dgtsGridLeft.GridColumnStyles.Add(dgcColLeft1); // add the column // make the column dgcColLeft1.Format = ""; dgcColLeft1.FormatInfo = null; dgcColLeft1.HeaderText = "Test this"; dgcColLeft1.MappingName = "ColumnLeft1Name"; dgcColLeft1.NullText = ""; dgcColLeft1.Width = 125; Tag: DataSet Limitation? Tag: 76529
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 - Performance It is my understanding that in SQL2000, stored procedure are no longer compiled. If that is true is there really any performance advantage to using sp's for .Net datasets or datareaders? -- Barry Fitzgerald Tag: DataSet Limitation? Tag: 76528
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 - Data Analyzer with many users We have the potential of 500 users for DA, need to know if that is reasonable, if there is a web-component that we could employ that would let the report remain dynamic, instead of static, when posted, how other organizations have used this product. Tag: DataSet Limitation? Tag: 76526
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 - Update ... Where with a DataSet/DataTable I am trying to do something that I would expect to be very easy but I am not having much luck finding the solution. I have a DataSet containing one data table of potentially 10000's of rows of data. Using ADO.NET I need to programmatically perform the equivalent of the following SQL Statement: UPDATE DataTable1 SET Field1 = 987 WHERE Field2 = 'XYZ'; Is there a way of performing this function directly against the DataSet or DataTable without iterating through all of the Rows and examining the value of each field? Please note that I must perform the updates against the DataTable and not the original data source. Any help would be appreciated. Thanks John Tag: DataSet Limitation? Tag: 76524
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 - Assign a string value a null date in one line? Hello, I'm pulling dates from a dataset and then assigning that to a textbox. These dates can be null, that is where my problem comes in at. I guess there is no such thing as an "empty date", I'll have to deal with the nulls, but I'm having trouble assigning them. I'd prefer to do it in one line of code if at all possible, just because I'm assigning like 80 fields out of the dataset, and would rather not have that many if then else's out there. Does anyone have a good way to take a null value from a dataset and assign it to a string value? Thanks, --Michael Tag: DataSet Limitation? Tag: 76518
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 - RowViewFilter and Nulls If you are trying to set a filter where a particulare column is null or not null, how do you do this? MyDataView = string.Format("MyField1 = '{0}' and MyField2 = '{1}'", "Fred", System.DbNull.Value). Would that be correct? Value.ToString()? Tag: DataSet Limitation? Tag: 76515
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 - Some Thoughts On Connection Strings I am seeing way too many connection strings not being properly protected. This morning an indiviual asked me to help him with an unrelated issue and I was shocked to see his password/username of his SQL Server shown in a XML file with absolutely no protection whatsoever. Any user could have opened the file and had access to his entire database. Even those who have the connection in code are not safe because of those who can decompile applications. I think in the next release of ADO.NET MS has to do something about this. I think this is a timebomb that is going to come back and bite some people. I am trying to write a paper on encryption and connection strings that is easily understandable. It is not easy to do. Hopefully will have it done soon. Tag: DataSet Limitation? Tag: 76511
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 - Dataset Insert Parameters... Hello I have a strong typed dataset, and when the add btn on the toolbar is clicked I do the following - which basiscally defines the strongly typed row, creates a new one & adds it to the dataset datarowcollection. drow As ds_studies.sp_retrieve_studiesRow drow = ds_studies.sp_retrieve_studies.Newsp_retrieve_studiesRow ds_studies.EnforceConstraints = False ds_studies.sp_retrieve_studies.Addsp_retrieve_studiesRow(drow) The user finds a blank screen and proceeds on filling values into the textbox controls / combo boxes etc. When the user clicks on the save button, I do the dataset update and all the usual stuff like checking for a successful update / retrieving the newly added row. My problem: when I reach the line of code in the save btn i.e. dataadapter.Update(dataset), I expect to have my adapter.InsertCommand.Parameter Collection filled with the user entered values: The parameters look right, the source column in each of them is the colum specified in the table mappings However none of the parm values are filled in. I dont think I should be filling in these values programatically. For your info my datasource is a stored proc and the parms are exactly mapped to what the proc requires. If anyone can shed some light on this, I'd appreciate it. Thanks, Nisha Tag: DataSet Limitation? Tag: 76507
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 - Retrieving Text data type - help I have a stored procedure in SQL Server: procedure proc_xxx @textOut Text output As Declare @ptrval varbinary(16) Select @textOut = someTextField From myTable Where... READTEXT myTable.someTextField @ptrval 0 0 I'm also using the MS Data Access Application Block, which I doubt is the problem here, with the following code snipet: parms[1] = new SqlParameter("@someTextField", SqlDbType.Text); parms[1].Direction = ParameterDirection.Output; SqlHelper.ExecuteNonQuery(_connectionString, CommandType.StoredProcedure, "proc_xxx", parms); When executing, I get the following error message: Parameter 1: '@someTextFieldof type: String, the property Size has an invalid size: 0 Where am I going wrong? in the stored procedure? in the SqlDbType setting? Thanks Alex Dinu alex_dinu@adp.com Tag: DataSet Limitation? Tag: 76506
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 - I don't know how... I want to add a column to a dataset and then update my Access XP database with the dataset changes. Anyone knowns how to do it?? Thanks! Andres Tag: DataSet Limitation? Tag: 76500
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 - how to update a ds in aspx, and implement this code? I found some sample code (below) that will handle all the update logic for a dataset. All you need to pass is the dataset, the tablename, & the name of the table in the db. Problem is, in our ASP.NET app, our dataset is bound to a grid. But how is it updated? If I send it to the SaveDataSet function below, the dataset will have the same original data that was retrieved into the grid. How does one update the dataset :) ? Thats my rediculous question. Thanks for any help! -- Jason Shohet public override int SaveDataSet(DataSet ds, string Tablename, string DatabaseTablename) { int RowsUpdated = -1; this.SetError(); if (!this.Open()) return -1; this.LoadDataAdapterCommands( new OleDbCommand("SELECT * FROM " +DatabaseTablename), ref this.DataAdapter); if (this.Transaction != null) { this.DataAdapter.InsertCommand.Transaction = this.Transaction; this.DataAdapter.UpdateCommand.Transaction = this.Transaction; this.DataAdapter.DeleteCommand.Transaction = this.Transaction; } /// update & return # of rows updated try { RowsUpdated = ((SqlDataAdapter) this.DataAdapter).Update(ds, ds.Tables[Tablename].ToString()); } catch(Exception ex) { this.SetError(ex.Message); return -1; } return RowsUpdated; } public override bool LoadDataAdapterCommands(IDbCommand SelectCommand,ref IDbDataAdapter Adapter) { if (Adapter == null) Adapter = this.CreateDataAdapter(SelectCommand); SqlCommandBuilder CommandBuilder= new SqlCommandBuilder((SqlDataAdapter) Adapter); Adapter.SelectCommand = SelectCommand; Adapter.DeleteCommand = CommandBuilder.GetDeleteCommand(); Adapter.UpdateCommand = CommandBuilder.GetUpdateCommand(); Adapter.InsertCommand = CommandBuilder.GetInsertCommand(); return true; } Tag: DataSet Limitation? Tag: 76495
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 - Paradox, BDE and ODBC -- OH MY! Hi! If this is not the place to post this, I apologize in advance... I am connecting to a Paradox 4.X database using ODBC. I have the latest version of MDAC loaded and have BDE 5.11 loaded. When I run the following query: select * from mytable I get the following results back (sorry for any bad tabbing): Code Sub Code Value 001 A 1 001 A 2 001 A 3 ... However, when I run this query: select * from mytable where [Code] = '001' I get only the first row back. Any ideas? Thanks in advance, cj Tag: DataSet Limitation? Tag: 76492
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 - ANN: Strong typed dataset schema generation template Hi, I've put together a template that generates strong typed dataset schema (xsd) content for a given selection of tables. *It includes primary and foreign keys*. Template is run with CodeSmith (free template based code generator - to download go to http://www.ericjsmith.net/codesmith/ and download *CodeSmith 2.5 Release Candidate Available*). Template can be obtained from my website: http://www.rthand.com/default.aspx?Page=2&SubPage=1#5 Comments are welcome either to forum http://www.ericjsmith.net/codesmith/forum/?f=9&m=2219 or by e-mail. -- Miha Markic - RightHand .NET consulting & software development miha at rthand com www.rthand.com Tag: DataSet Limitation? Tag: 76487
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 - problem referencing field in sqldatareader I have a db with 4 fields (id,field1, field2,field3). I populate a datareader (named dr) with this sql select * from table where id=2 Now i want to pre-set a textbox with the info in field1. Seems like this should work TextBox5.text=dr("field1") i keep getting this error Exception Details: System.InvalidOperationException: Invalid attempt to read when no data is present. So the first assumption is i've selected a row that doesn't exist or that has no info in field1 BUT if i bind the datareader to a datagrid i see the following info id field1 field2 field3 2 sdf dgfsdg Choose where isn't my reference working? Tag: DataSet Limitation? Tag: 76485
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 - Inputoutput Params I guess this is bad practice but i have an SQL 2000 SP that uses a single varchar(100) parameter for input and output. I would like to use an SQLcommand object to call it but this doesn't seem to work, here's my code: SqlParameter ParamSessionID = new SqlParameter("@SessionID", SqlDbType.VarChar, 100); ParamSessionID.Direction = ParameterDirection.InputOutput; Comm1.Parameters.Add(ParamSessionID); Comm1.Parameters["@SessionID"].Value = m_currentPage.Session.SessionID; Comm1.CommandType = CommandType.StoredProcedure; Conn.Open(); Comm1.ExecuteScalar(); The error i get is 'System.Data.SqlClient.SqlException: String or binary data would be truncated.' Using the debugger i can see the value of the parameteris as a 25 charected string. SQL profiler shows the following command being issued: declare @P1 varchar(100) set @P1=NULL exec sp_CevasSessionCreate @SessionID = @P1 output select @P1 This seems to suggest that SQLClient doesn't implement InputOutput as expected, i could get the data by setting the commandtype to text and using ExecuteScalar but it would be nice to do this via the command object. Any ideas? Micky Tag: DataSet Limitation? Tag: 76478
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 - DataAdapter Config Wizard misery We tried using that Config Wizard, but when a query changes, all the update logic goes haywire. So we went back to manually doing things: 1. We have no datasets dragged-and-dropped in Visual Studio. They are all defined in the code, generated at runtime. 2. when a user updates or hits a 'delete' button next to a row in a datagrid, we call a webservice. In there, we coded insert, update & delete functionality. THE PROBLEM: I am looking for a way to have .NET generate its own update / delete / insert statements. BUT, I don't want to use that DataAdapter Configuration Wizard because if we change around a field in the db, everything breaks and there's too much going on under the hood to fix it. If a query changes in our dataset, I would like the update logic to automatically change as well. I've been looking at CommandBuilder -- is this something good to use? In order to use it, do I need to define the dataset at Design Time (visually drag it on to the web service etc) ? Any other suggestions would be appreciated TY Jason Shohet Tag: DataSet Limitation? Tag: 76477
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 - ChildToParent and ParentToChild navigation? The question to the ADO.NET gurus: Is it even possible to navigate from child table to parent table without looping through untyped arrays of datarows? Also, maybe someone can tell, what's wrong in my code when I try to navigate from parent to child (syntax exactly from .NET Framework Tutorials and Samples): private Standardization.Standardizer.Main localParent; //my main MDI parent form private System.Data.DataRow[] foundExperts; ... this.localParent = (Standardization.Standardizer.Main)(this.MdiParent); this.cboName.DataSource = this.localParent.dsBase; this.cboName.DisplayMember = "entityLVExpert.attrName"; this.cboName.ValueMember = "entityLVExpert.attrID"; ... // this works fine, but following code raises that... this.foundExperts = this.localParent.dsBase.entityLVExpert.Select("LVCommitteeExpertLVExpert_FK. attrCommittee = '" + this.txtTC.Text.ToString() + "'", "attrName", System.Data.DataViewRowState.CurrentRows); ...VS.NET2003 tells that it cannot understand object child at position 1... Thanks in advance for any constructive comments! Tag: DataSet Limitation? Tag: 76476
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 - Null problem We've a typed dataset which has a number of datatables. After some computing we insert rows to these datatables. My question is, we want to insert null value to an integer column in this datatable. How can this be done? What should we do to do sth. like below; myTypedDataSet.myDataTable.addmyDataTableRow(strValue1, intValue2, intValue3, null, /*this column is an integer column*/ intValue5); Thanks, Tag: DataSet Limitation? Tag: 76466
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 - Error Message -- Help I built and ran my program. I got a Microsoft Development Environment message saying "An unhandled exception of type 'System.ArgumentException' occured in mscorlib.dll Additional information:Invalid URL." Plus it is highlighting 'MyBase.NEW()' in the Public Sub New() subroutine in the Declarations. What do I do to fix this problem? Would someone please help me. I went thru ADO.NET to my ACCESS database to get my records and I have an DataFrom1.vb form out there that does no come up now because of this message. Mathew Tag: DataSet Limitation? Tag: 76465
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 - Sort, Filter and Restrict RecordCount in a DataSet before Transformation Hello Group, I have a DataSet with one DataTable filled. Before transforming the DataSet into a CSV-Format I have to Filter, Sort and restrict the Number of Records. Any suggestion how to archive this Step? Please remember that it is not possible for me to Filter, Sort and Restrict when filling the DataSet. It must be done with the existing DataSet... Code for Filling the DataSet and Transforming it is already done. Thanks4Help Tag: DataSet Limitation? Tag: 76461
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 - Writing XML file Hi all, I have a small problem in writing XML file from VB.net. I am trying to write the XML file using dataset. I am able to write the XML in sequential way(one node after other). I can write in the hierarchial(tree) structure also but only by using datagrid. But I would like to write the XML file without using datagrid but just the grid. I am sending the sample. Could u please tell me how I can write hierarchially using dataset but without using the datagrid. Best regards, Kelly Tag: DataSet Limitation? Tag: 76447
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 - Using OracleType.Clob Parameter ? Hello, I'm considering the option of using OracleType.Clob Parameter in .net applications. 1. Is it correct that this Parameter type is supported only under Framework 1.1? 2. Are there any performance problems when using Clob with large strings ? thanks. Tag: DataSet Limitation? Tag: 76445
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 - Problem using OLEDB connector Hi, I am trying to insert data into an Excel sheet using Microsoft Jet OLE DB 4.0 driver. One of the fields is exceeding 255 characters. I get the error: "The field is too small to accept the amount of data you attempted to add. Try inserting or pasting less data" This is surely not a problem with Excel since I put in the data manually. Please let me know if we have a solution/workaround for this. Thanks, Pranav. Tag: DataSet Limitation? Tag: 76443
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 - Correct SP:s not executing I often use ADO.NET and SP:s, but now I'm stuck after spending all yesterday on two issues 1) ARITHABORT A form calls SP to insert a record, but executing it only results in the following message :"Insert failed becase the following SET options have incorrect settings 'ARITHABORT'". I've checked the SQL Server documentation and can't see how it at all applies in this case. Tracing the command in SQL Profiler this is what it looks like exec insertReportPeriodExchangeRates @FromCurrencyID = N'GBP', @ToCurrencyID = N'USD', @ExchangeRate = 1.600000, @ReportPeriodID = N'2004Q3', @ReportPeriodExchangeRateID = @P1 output, @TimeStamp = @P2 output If I execute that command from SQL Analyzer it works just fine. No error message 2) .SP does not execute at all Another form calls a SP to delete a record, but the SP is never executed! How is that possible? Tracing the command in SQL Profiler this is what it looks like exec deleteReportPeriods @Original_ReportPeriodID = N'2003Q5', @Timestamp = 0x00000000000083C1 If I execute that command from SQL Analyzer it works just fine. All in all about 200 SP:s are called in the application, and these are the only one that failing. Again, if I run them from SQL Analyzer they execute correctly, so there is something odd happing in ADO:NET. All the commands are executed from inherited forms. Any ideas where to look? Kind regards, Kenneth Bohman Tag: DataSet Limitation? Tag: 76442
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 - Concurrency violation: the DeleteCommand affected 0 records ----------------------------------------------------------------- The PK in the oledbdeletecommand.parameters collection *appears* to have the appropriate Primary Key to look for to delete, so I'm not sure why it's not able to find the record to delete... After reloading the master form, the datarow deletes and the dataadapter.update(me.ds) goes just fine. ----------------------------------------------------------------- I have two forms in a master/detail relationship, with the master form's dataset shared with the detail form. I use the form's currencymanagers to synch the detail record, add a new row, etc. The database is Access, using the Jet driver. After creating a new record with "cm.AddNew()" in the detail form, the following gives me the "affected 0 records" error: 1. update the database with the dataadapter via "masterForm.da.update(masterForm.ds)" 2. use "@@Identity" to get the database's primary key just generated on this database connection for my new row, and alter our dataset row's PK field to conform with database by using "drCm.Item("PK") = newPK" 3. call cm.EndCurrentEdit() & drCm.acceptChanges() to set the row's state from "Modified" to "Unchanged". 4. back in the master form, delete the new record via "dr.Delete()" ////////////////// This throws the Exception ////////////////// 5. attempt to synch the datarow delete w/ the database by using the dataadapter via: "me.da.update(me.ds)" Here are some code snippets: mngUsers.vb ------------------------------------- Private cmEmployees As CurrencyManager Private Sub mngUsers_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load Me.cmEmployees = CType(Me.BindingContext(Me.DsUsers1.Employees), CurrencyManager) '// some code snipped from here End Sub Private Sub btnNew_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnNew.Click Dim myUser As New mngUsersNewEdit(mngUsersNewEdit.formAction.newUser) Me.AddOwnedForm(myUser) myUser.Show() End Sub Private Sub btnDelete_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDelete.Click Dim drCm As DataRow drCm = CType(Me.cmEmployees.Current, DataRowView).Row Try drCm.Delete() Me.OleDbDataAdapter1_Users.Update(Me.DsUsers1.Employees) Catch ex As Exception MessageBox.Show(ex.Message + vbCrLf + vbCrLf + ex.StackTrace) End Try End Sub mngUsersNewEdit.vb ----------------------------------- Private m_actionToTake As formAction Private m_parent As mngUsers Private cmEmployees As CurrencyManager Private cmOwner As CurrencyManager Private Sub mngUsersNewEdit_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load Me.m_parent = Me.Owner Me.cmEmployees = CType(Me.BindingContext(Me.m_parent.DsUsers1.Employees), CurrencyManager) '// If appropriate, Synchronize our Form to the record currently selected in parent form If m_actionToTake = formAction.editUser Then '// set a currency manager for the owner form to find Form1's current record position cmOwner = CType(CType(Me.Owner, masterdetailDeleteTest.mngUsers).BindingContext(Me.m_parent.DsUsers1.Employe es), CurrencyManager) '// synchronize the table record positions between form1 and form2 Me.cmEmployees.Position = Me.cmOwner.Position Else '// create a new itemOption cmEmployees.AddNew() '// set up default data so avoid DBnull conflicts '// casting the currency manager and accessing it's 'row' object allows us to access an item by column name. Dim drNew As DataRow = CType(cmEmployees.Current, DataRowView).Row drNew.Item("IsActive") = True drNew.Item("Birthdate") = "1/1/1970" End If '// Set our databindings Me.tbEmployeeID.DataBindings.Add("text", Me.m_parent.DsUsers1.Employees, "EmployeeID") Me.tbFirstName.DataBindings.Add("text", Me.m_parent.DsUsers1.Employees, "FirstName") '// etc. w/ the databinding End Sub Private Sub btnOK_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnOK.Click Me.cmEmployees.EndCurrentEdit() Try Me.m_parent.OleDbDataAdapter1_Users.Update(Me.m_parent.DsUsers1) If Me.m_actionToTake = formAction.newUser Then '// To avoid having the autogenerated primary key in dataset out of synch with database, '// retrieve the newly created database PK and update our dataset's PK with it. '// Include a variable and a command to retrieve the autogenerated primary key value '// (identity value) from the Access database. '// cf. ms-help://MS.VSCC/MS.MSDNVS/cpguide/html/cpconretrievingidentityorautonumber values.htm Dim newID As Integer = 0 Dim idCMD As OleDbCommand = New OleDbCommand("SELECT @@IDENTITY", Me.m_parent.OleDbConnection1) '// Retrieve the identity value. newID = CInt(idCMD.ExecuteScalar()) '// Assign retrieved autonumber to our new row's primary key. Dim drCm As DataRow = CType(Me.cmEmployees.Current, DataRowView).Row '// datarow to inspect our current row drCm.Item("EmployeeID") = newID '// push DB's new PK to row's "Current", "Original", and "Default" values '// Roll our PK value change into the row's "original version." '// The deleteCommand uses the original row PK values to do the deletion, '// which may be out of synch with the database. If so, the dataset would throw an '// exception when the database (looking for the wrong PK) could still not find the row to delete. cmEmployees.EndCurrentEdit() '// allow this row's changes to remain drCm.AcceptChanges() '// set row's state from "Modified" to "Unchanged" to prevent unneccessary labor End If Catch ex As Exception MessageBox.Show(ex.Message + vbcrlf + vbcrlf + ex.StackTrace) End Try Me.Owner.Focus() Me.Close() End Sub Tag: DataSet Limitation? Tag: 76440
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 - How to create dataview from two datatables Hi is there any way to create a dataview from two different datatables. My purpose is to display a datagrid. some columns from one table and some other columns from other table. i am using commandbuilder for automatic query. so i am not able to join query from datasource. Thanks in advance. Regards H. Mahadevan Tag: DataSet Limitation? Tag: 76436
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 - Select a Row in A DATAGRID Hai All, I have a Datagrid in a help Screen. How I can select more than one row (HIGHLIGHTS). Help me to get the selected rows from that datagrid. I am awiting for your earlier valuable reply. Thanks in Advance, Regards, Karnan.S Tag: DataSet Limitation? Tag: 76434
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 - how to do transaction hiye, is there a nice sql script example out there which shows how t-sql transaction is done? Tag: DataSet Limitation? Tag: 76432
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 - how to return stored procedure error? hiye, does anyone know how to return a stored procedure error to vb.net? any or all error capture in stored procedure i want em to be return to vb.net. thanks for the help.. Tag: DataSet Limitation? Tag: 76428
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 - "One or more accessor flags were invalid." -- VFPOLEDB I am trying to do a simple Asp.Net update using the same OleDb code that has worked for Access databases, and I get this error message when using a Visual Foxpro database: "One or more accessor flags were invalid." It retrieves data ok, but won't update it. Anyone know why? Thanks. Tag: DataSet Limitation? Tag: 76418
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 - Table Names with Spaces I wrote a program that inserts records into a table in a MS Access database. For some reason, it works only for tables without spaces in their names: There are four tables: "test 1" "test2" "test 3" and "test4" each with fields word, pos, and meaning. The following code works only for test2 and test4, the tables whose names do not contain any spaces. string tableName="test 1"; //place table name here OleDbConnection conn=new OleDbConnection("provider=microsoft.jet.oledb.4.0;data source=lists.mdb"); OleDbDataAdapter da=new OleDbDataAdapter("select * from ["+tableName+"]",conn); OleDbCommandBuilder cb=new OleDbCommandBuilder(da); DataSet ds=new DataSet(); da.Fill(ds); conn.Close(); DataTable dt=ds.Tables[0]; DataRow dr=dt.NewRow(); dr["word"]="myword"; dr["pos"]="mypos"; dr["meaning"]="mymeaning"; dt.Rows.Add(dr); try { da.Update(ds); } catch(OleDbException ole){Console.WriteLine(ole.Message);} Tag: DataSet Limitation? Tag: 76415
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 - OleDb versus (Sql,Oracle,Odbc etc..) Is there a peformance difference when using OleDB classes instead of SqlServer? Or are the differences mainly functional, for example SqlServer lets you perform more of its proprietry functions using it's classes. Any help appriciated! This question is the same for Oracle, Odbc and any other specific .NET provider... Thanks, Robby Tag: DataSet Limitation? Tag: 76410
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 - possible to step into a stored procedure Hi- when debugging, is it possiblt to step into a stored procedure? For example, if I have a method in my DAL class called AddProduct() and it makes a call to SqlCommand.ExecuteNonQuery() can I step into that sproc that it will be calling? I hope so, that would be the coolest! OK, if this is possible and you know how, please do share. Thanks, Steve Tag: DataSet Limitation? Tag: 76404
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 - Why aren't there any interfaces?? I'm working with DataSets in my code and cannot find a suitable Interface to reference. As a work-around, I've written an Interface (IDataSet) that defines all of the public method signatures of a DataSet class. A custom class (DataSetExt) implements that Interface and delegates public method calls to *base*. I know that in taking this approach I've left myself open to a slew of potential problems especially if the signatures of the DataSet class change. However, the System.Data.DataSet class has no primary interface....???? Any thoughts on this? thx Tag: DataSet Limitation? Tag: 76399
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 - SqlParameter SqlDBType.text size What is the correct way to address the size of a SqlDBType.text field in a SqlParameter The Data Adapter configuration wizard does this cmdUpdate.Parameters.Add("@myvar", SqlDbType.Varchar, 2147483647) Is that right (I'm assuming so), but could I also do this? (using SqlDbType.Text) cmdUpdate.Parameters.Add("@myvar", SqlDbType.Text, 2147483647) or even this, as the size is defined in Sql server cmdUpdate.Parameters.Add("@other_accident_cause", SqlDbType.Text, 16) Little confused here.. :) --Michael Tag: DataSet Limitation? Tag: 76397
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 - Speeding up a Directory Search Process This is a multi-part message in MIME format. ------=_NextPart_000_00D6_01C3D46F.A23E0DE0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I having trouble querying for users that have changed, when I have a = node that have over 750 users. It takes way to long over 1 hour, if it = does return users. How can I improve this? objADSDirEntry =3D New DirectoryEntry(sInADSADsPath, strADSUserName, = strADSPassword, AuthenticationTypes.ServerBind) ObjADSDirSearcher =3D New = DirectoryServices.DirectorySearcher(objADSDirEntry) Err.Clear() ObjADSDirSearcher.Filter =3D = "(&(|(objectClass=3Duser)(objectClass=3Dgroup)(objectClass=3Dcontact))(&(= uSNChanged>=3D" & LastMod & ")(uSNChanged<=3D" & NewLastMod & ")))" 'ObjADSDirSearcher.PageSize =3D 1000 ObjADSDirSearcher.ServerTimeLimit =3D TimeSpan.FromMinutes(3) For Each objSearchResult In ObjADSDirSearcher.FindAll objadsDirEntry2 =3D objSearchResult.GetDirectoryEntry Thanks Robert ------=_NextPart_000_00D6_01C3D46F.A23E0DE0 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 6.00.2800.1126" name=3DGENERATOR> <STYLE></STYLE> </HEAD> <BODY> <DIV> </DIV> <DIV>I having trouble querying for users = that have=20 changed, when I have a node that have over 750 users. It takes way to = long over=20 1 hour, if it does return users. How can I improve this?</DIV> <DIV> </DIV> <DIV> </DIV> <DIV> </DIV> <DIV>objADSDirEntry =3D New = DirectoryEntry(sInADSADsPath,=20 strADSUserName, strADSPassword, = AuthenticationTypes.ServerBind)</DIV> <DIV>ObjADSDirSearcher =3D New=20 DirectoryServices.DirectorySearcher(objADSDirEntry)</DIV> <DIV>Err.Clear()</DIV> <DIV>ObjADSDirSearcher.Filter =3D=20 "(&(|(objectClass=3Duser)(objectClass=3Dgroup)(objectClass=3Dcontact)= )(&(uSNChanged>=3D"=20 & LastMod & ")(uSNChanged<=3D" & NewLastMod &=20 ")))"</DIV> <DIV>'ObjADSDirSearcher.PageSize =3D = 1000</DIV> <DIV>ObjADSDirSearcher.ServerTimeLimit =3D=20 TimeSpan.FromMinutes(3)</DIV> <DIV>For Each objSearchResult In=20 ObjADSDirSearcher.FindAll</DIV> <DIV>objadsDirEntry2 =3D=20 objSearchResult.GetDirectoryEntry</DIV> <DIV> </DIV> <DIV> </DIV> <DIV>Thanks</DIV> <DIV> </DIV> <DIV>Robert </DIV></BODY></HTML> ------=_NextPart_000_00D6_01C3D46F.A23E0DE0-- Tag: DataSet Limitation? Tag: 76392
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 - ConnectionString: set ANSI NULL on/off I want to know if there is a way to specify ANSI NULL processing ON/OFF, based on a ConnectionString parameter. This will take care of processing "x = NULL" and "x IS NULL" kind of SQL expressions appropriately based on the ON/OFF setting. I expect to set this like: ConnectionString="Provider=...; ANSI_NULL=no"; OR ConnectionString="Provider=...; Extended Properties="ANSI_NULL=no;" This is for connecting to Sybase, using Ole DB classes. TIA Raj "Operator... Get me outa here." Tag: DataSet Limitation? Tag: 76385
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 - Oracle CLOB Support Does latest MDAC versions possibly could support Oracle CLOB datatype? Thanks, Leonid. Tag: DataSet Limitation? Tag: 76381
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 - DataGrid Help This is a multi-part message in MIME format. ------=_NextPart_000_0008_01C3D45A.E2D57150 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I am using Provider=3DMSIDXS.1 and following code to fill datagrid.=20 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As = System.EventArgs) Handles Button1.Click Dim strCatalog As String ' Catalog Name strCatalog =3D "TestCatalog" Dim strQuery As String If TextBox1.Text <> "" Then DataGrid1.Visible =3D True strQuery =3D "Select DocTitle,Filename,Size,PATH,URL from SCOPE() where = FREETEXT('" & TextBox1.Text & "')" Dim connString As String =3D "Provider=3DMSIDXS.1;Integrated Security = .=3D'';Data Source=3D'" & strCatalog & "'" Dim cn As New System.Data.OleDb.OleDbConnection(connString) Dim cmd As New System.Data.OleDb.OleDbDataAdapter(strQuery, cn) Dim testDataSet As New DataSet() cmd.Fill(testDataSet) Dim source As New DataView(testDataSet.Tables(0)) DataGrid1.DataSource =3D source DataGrid1.DataBind() Else DataGrid1.Visible =3D False End If End Sub End Class The result I am getting in datagrid is in plain text How do I make datagrid to show url in clickable format? Or how can I make datagrid item in hyperlink format? ------=_NextPart_000_0008_01C3D45A.E2D57150 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 6.00.2800.1276" name=3DGENERATOR> <STYLE></STYLE> </HEAD> <BODY> <DIV>I am using Provider=3DMSIDXS.1 and following = code to fill=20 datagrid. </DIV> <DIV> </DIV> <DIV> Private = <FONT=20 color=3D#0000ff size=3D2>Sub = Button1_Click(<FONT=20 color=3D#0000ff size=3D2>ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim = strCatalog=20 As = <FONT=20 color=3D#0000ff size=3D2>String ' Catalog Name strCatalog =3D "TestCatalog" Dim = strQuery=20 As = <FONT=20 color=3D#0000ff size=3D2>String If = TextBox1.Text=20 <> "" Then DataGrid1.Visible =3D True<FONT=20 size=3D2> strQuery =3D "Select DocTitle,Filename,Size,PATH,URL from SCOPE() = where=20 FREETEXT('" & TextBox1.Text & "')" Dim = connString=20 As = <FONT=20 color=3D#0000ff size=3D2>String =3D = "Provider=3DMSIDXS.1;Integrated=20 Security .=3D'';Data Source=3D'" & strCatalog & "'" Dim cn = <FONT=20 color=3D#0000ff size=3D2>As New = System.Data.OleDb.OleDbConnection(connString) Dim cmd = <FONT=20 color=3D#0000ff size=3D2>As New = System.Data.OleDb.OleDbDataAdapter(strQuery,=20 cn) Dim = testDataSet=20 As = <FONT=20 color=3D#0000ff size=3D2>New DataSet() cmd.Fill(testDataSet) Dim source As New<FONT=20 size=3D2> DataView(testDataSet.Tables(0)) DataGrid1.DataSource =3D source DataGrid1.DataBind() Else DataGrid1.Visible =3D False<FONT=20 size=3D2> End = <FONT=20 color=3D#0000ff size=3D2>If End = <FONT=20 color=3D#0000ff size=3D2>Sub End Class   The = result I am getting=20 in datagrid is in plain text</DIV> <DIV>How do I make datagrid to = show url in=20 clickable format?</DIV> <DIV>Or how can I make datagrid item = in hyperlink=20 format?</DIV></BODY></HTML> ------=_NextPart_000_0008_01C3D45A.E2D57150-- Tag: DataSet Limitation? Tag: 76379
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 - Getting a RecorSet returned by a SP Please, how can i get and read a RecordSet returned by a SQL SERVER stored procedure? Tks in adv. Fabiano Tag: DataSet Limitation? Tag: 76377
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 - Navigation in DataGrid Hallo I have a DataGrid that shows records from my database and allow the user to navigate to the children records (i.e. press on the + sign and then on the DataRelation name to navigate to the corrosponding rows) Anyway the DataRelation names are not very user-friendly. My client expects something more discriptive than "credit2details". How can I change only these tabs without to change all the DataRelation throughout the whole project thanks in advance Tag: DataSet Limitation? Tag: 76373
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 - .Tif Pictures I got some .tif pictures that I used in ACCESS. I am trying to use these pictures in VB.NET. Do I have to switch these pictures format over to something else or is there a way I can use them? Tag: DataSet Limitation? Tag: 76365
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 - Abstracting field names in strongly-typed datasets? I'm working with a table that has poorly-named fields which I cannot change: dptnum dptname I'm creating a strongly-typed DataSet to work with the data in this table, and I would much rather that my DataSet have fieldnames of: DepartmentNumber DepartmentName Is there some way to accomplish this without modifying the original table? some sort of "alias" that I can add to the elements in the XSD? I considered using a Sql Server view to accomplish this, but views do not have primary keys, and so the DataSet would have problems with Update commands. I look forward to your suggestions. Thanks! Tag: DataSet Limitation? Tag: 76362
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 - Updating and Access table with more than 127 columns Due to an existing limitation of Access, you cannot issue an UPDATE query with more than 127 fields (Access has a limit of 255 fields and during an update query, both the column your are updating and the value your are inserting are treated as fields, which therefore limits you to having 127 columns in your query). ADO didn't have a problem with this if you used a connected recordset (I'm assuming because it uses cursors or something). Since updates are submitted via UPDATE queries in ADO.NET this becomes an issue. Making the table have less than 127 columns is not an option as there are existing implmentations of the database (using old clients that used VB and ADO that worked...). Only updating the 'changed' fields does not solve the problem as the problem still exists when you change more thant 127 fields... There are issues with splitting the UPDATE into 127 field chucks if some of the fields more then one chunk are marked as 'required'. My question is, is there any way to deal with this issue in ADO.NET? I don't want to have to resort to using interop and old ADO recordsets but it appears to me like this is the only way to deal with this issue in a generic way. Thanks Wayne Tag: DataSet Limitation? Tag: 76355
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 - Configuration File Hello, I was wondering where I might find a "sample" application configuration file for a windows applications. What should the file be named.... ApplicationName.config ? I am have created web applications and the system automatically generates a "template" configuration file. Can the system generate a template file for windows applications? In a web application I use the method ConfigurationSettings.AppSettings ("ConnectStr") to obtain my configuration settings. Will I still be able to use the same method? Thanks in advance for your assistance!!!!!!!! Tag: DataSet Limitation? Tag: 76353
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 - IDataReader - cannot read I have a method in my datalayer that returns IDataReader. When I call this method it returns the datareader but when I try to read it , gives me following error: any idea ? thanks in advance ------------------ Error description: ------------------ An unhandled exception of type 'System.Runtime.Remoting.RemotingException' occurred in mscorlib.dll Additional information: This remoting proxy has no channel sink which means either the server has no registered server channels that are listening, or this application has no suitable client channel to talk to the server. Tag: DataSet Limitation? Tag: 76351
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 - HELP serious performance degradation compared to QA I have a stored procedure that takes 4 seconds to execute (returning 3840 rows) from Query Analyser, yet when I fill it using the following (assume the variable SQL is the stored procedure) Dim cmd As SqlCommand Dim ds As New DataSet Dim sa As SqlDataAdapter cmd = New SqlCommand(SQL, cn) sa = New SqlDataAdapter(cmd) sa.Fill(ds) it times out or takes much, much longer than 4 seconds - on the order of a minute. This delay has a lot of corresponding server processor activity but absolutely none for the client. I've read some previous posts about timeout issues, but none of them explain this performnace degradation. All I want is the data, and no extra overhead. Is there any way in .Net I can get the *same* performance that I get from QA? The same problem happens in VB6 using recordsets - the 4 second query takes 62 seconds. I already looked at the DataSetSurrogate and it performance is worse. http://support.microsoft.com/?id=829740 DataReader shows the same behavior/problem, only it times out at 30 seconds and reports "system error". Someone please help. TIA, Bob Tag: DataSet Limitation? Tag: 76350
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 - Fill a DataTable in a Class from another Class Hi, I need to fill a dataset in a form and automatically take affect in other form. For example: I have a DataGrid attached to a DataTable in Form1 and I'm adding a record in the same DataTable, but this time from Form2 and it doesn't take effect in form1. Please help me Tag: DataSet Limitation? Tag: 76348
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 - Pros and Cons of MS Data Access Application Block? Is the Microsoft Data Access Application Block worth using? I'm new to it and would like to get the opinions of some seasoned veterans. I'm not sure it if will really save me very much time or effort. Thanks -- Dave Veeneman Chicago Tag: DataSet Limitation? Tag: 76345
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 - Performance Monitor Connection Pools I have done some reading and figured that i can determine the number of connections in my data pool. i.e. http://techrepublic.com.com/5100-6329_11-5034285- 2.html My question relates to performance monitor. While adding the counters to performance monitor there is a selection box for "Instance". I see a couple of my applications in this instance box however, i do not see the web application that I would like to measure. I see a number of w3svc/xx/xxx instances. How do i determine which w3svc instance is the one i need to track? I also have read that I should take the results with a grain of salt. That is fine. Any help is greatly appreciated. dave Tag: DataSet Limitation? Tag: 76344

I have a SQL table that has a column defined as Sql Data Type decimal(38,15). In case you are wondering, the precision and scope are that large because it contains 'scientific' numbers which require a range of that size

Anyway, if I try to fill a DataSet with a DataAdapter, with a simple "select * from table", I get

System.OverflowException: Conversion overflow

when it gets to a row that has a column over some value (and I'm sure under some value as well)

For instance: "1000000000000000.000000000000000" produces the erro

Does anyone know what this value is? And is there anyway around this, or is it simply the case that .NET DataSet can't handle a Sql Data Type decimal with a precision and/or scope of that size

TI

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RE: DataSet Limitation? by anonymous

anonymous
Wed Jan 07 16:56:08 CST 2004

On further review, it looks like the Fill method of the DataAdapter uses int32, which would explain it.

Is there any way around this, that anyone can think of?

jdn

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RE: DataSet Limitation? by v-kevy

v-kevy
Wed Jan 07 20:01:39 CST 2004

Hi,

This is an know issue, that a "Convertion Overflow" exception will be
thrown if the precision of the decimal field is greater than 28. This will
be fixed in the next version of VS.net. The workaround is to use methods
like SqlDataRead.GetSqlDecimal() to get the decimal values.

If anything is unclear, please feel free to reply to the post.

Kevin Yu
=======
"This posting is provided "AS IS" with no warranties, and confers no
rights."

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RE: DataSet Limitation? by anonymous

anonymous
Thu Jan 08 08:56:15 CST 2004

I am still having problems with it.

If I try to pull over the value "1000000000000000.000000000000000", I get an overflow. I've tried casting it into decimal and long (I would think long should work), but same "Conversion overflow error." And you can't cast SqlDbDecimal into a double.

What should I do?

jdn

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RE: DataSet Limitation? by anonymous

anonymous
Thu Jan 08 09:06:06 CST 2004

Okay, I got it. You have to do:

"DataReader.GetSqlDecimal[0].ToDouble()"

and then you are good to go. I never understand why the syntax of languages are such that "(double)DataReader.GetSqlDecimal[0]" doesn't work, but there is a method to do it.

I guess there is a method to the madness.

jdn

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