Dataset Relations

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  - 1
    - 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: Dataset Relations Tag: 59441
  - 2
    - 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: Dataset Relations Tag: 59431
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    - 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: Dataset Relations Tag: 59426
  - 4
    - 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: Dataset Relations Tag: 59424
  - 5
    - 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: Dataset Relations Tag: 59414
  - 6
    - 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: Dataset Relations Tag: 59413
  - 7
    - 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: Dataset Relations Tag: 59412
  - 8
    - 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: Dataset Relations Tag: 59410
  - 9
    - 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: Dataset Relations Tag: 59407
  - 10
    - 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: Dataset Relations Tag: 59404
  - 11
    - 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: Dataset Relations Tag: 59402
  - 12
    - 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: Dataset Relations Tag: 59397
  - 13
    - 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: Dataset Relations Tag: 59396
  - 14
    - 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: Dataset Relations Tag: 59395
  - 15
    - 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: Dataset Relations Tag: 59392
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    - 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: Dataset Relations Tag: 59380
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    - 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: Dataset Relations Tag: 59370
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    - 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: Dataset Relations Tag: 59363
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    - 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: Dataset Relations Tag: 59360
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    - Crystal Reports a.. Crystal Reports works only with OLEDB providers? thanks, Tag: Dataset Relations Tag: 59358
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    - 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: Dataset Relations Tag: 59354
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    - 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: Dataset Relations Tag: 59351
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    - 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: Dataset Relations Tag: 59346
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    - 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: Dataset Relations Tag: 59345
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    - 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: Dataset Relations Tag: 59342
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  - 1
    - 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: Dataset Relations Tag: 59340
  - 2
    - 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: Dataset Relations Tag: 59338
  - 3
    - 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: Dataset Relations Tag: 59334
  - 4
    - 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: Dataset Relations Tag: 59333
  - 5
    - 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: Dataset Relations Tag: 59331
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    - 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: Dataset Relations Tag: 59330
  - 7
    - .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: Dataset Relations Tag: 59321
  - 8
    - 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: Dataset Relations Tag: 59317
  - 9
    - 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: Dataset Relations Tag: 59313
  - 10
    - 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: Dataset Relations Tag: 59296
  - 11
    - Strange timeout problem... I'm working on an ASP.NET website and a strange problem occurs. I execute a stored procedure that gets data out of 2 SQL Server databases. When the stored procedure is executed via the webpage, it times out (time after time). However, once I execute the stored procedure manually in Query analyzer, I get the correct results. After the manual execute, the page performs normally as well. I have another (similar) website in which I follow the exact same logic, and over there I don't have that problem. These are the errormessages I get : SOURCE : .Net SqlClient Data Provider TYPE : System.Data.SqlClient.SqlException ERROR : Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding. Any help would be appreciated. Thanx a lot in advance, Domien. Tag: Dataset Relations Tag: 59294
  - 12
    - PostGreSql data provider Hi, has MicroSoft developed any native ado.net data provider for PostGreSql. TIA regards Tag: Dataset Relations Tag: 59293
  - 13
    - locking headers in the Datagrid Is it possible to have the scroll bar appear beneath the headers, so they stay in view while scrolling down a large list of data in the datagrid control? you could have two grids and split and over lap them via a frame, but for huge tables that would not be a feasible option... i'd also like the chance to have this turned while using the paging and if the second page has a field that's longer that any in the first page, the header's fall out of width with each other when using frames. thanks. Tag: Dataset Relations Tag: 59289
  - 14
    - Intermittent exception Hi. We get an intermittent exception as in the example below. Any suggestions on how to approach this problem would be appreciated. We cannot find more information on this exception anywhere. Exception: Internal connection fatal error. Source: System.Data Stack trace: at System.Data.SqlClient.TdsParser.Run(RunBehavior run, SqlCommand cmdHandler, SqlDataReader dataStream) at System.Data.SqlClient.TdsParser.PropagateDistributedTransa ction(Byte[] buffer, Int32 length, Int32 timeout) at System.Data.SqlClient.SqlInternalConnection.EnlistDistribu tedTransaction(ITransaction newTransaction, Guid newTransactionGuid) at System.Data.SqlClient.SqlInternalConnection.EnlistDistribu tedTransaction() at System.Data.SqlClient.SqlInternalConnection.Activate (Boolean isInTransaction) at System.Data.SqlClient.SqlConnection.Open() at Intenda.Procurement.Application.UserContext..ctor (String session) at Intenda.Procurement.Services.ViewStateHandler.Persist (String session, String key, String viewState) Tag: Dataset Relations Tag: 59283
  - 15
    - Error Deleting file or folder. Hi, Good Day! I need to know how can i delete my ASP.Net program? I tried to delete from Windows Explorer and from IIS's Default Web Site, both won't works. The error message pop out as below: "Cannot delete XXX: Access is denied. The source file may be in use." Can someone help. Thanks in advanced. rgds, Phoebe. Tag: Dataset Relations Tag: 59281
  - 16
    - Debugging problem. Hi, Good Day! I wonder why i can't debug my ASP.Net program. I do checked the "ASP.Net debugging" under configuration properties but there's an error pop out when i try to run my program. Below is the error message: "Error while trying to run project: Unable to start debugging on the web server. You do not have the permissions to debug the server. Verify that you are a member of the 'Debugger Users' group on the server. Would you like to disable future attempts to debug ASP.NET pages for this project?" Can someone help? Thanks in advanced. rgds, Phoebe. Tag: Dataset Relations Tag: 59280
  - 17
    - OFF TOPIC : SQL history? does anyone know why the syntax for SQL Inserts and Updates is so different? the Insert syntax can cause so many problems it would be nice to use something similar to the update syntax eg Insert into Mytable a = val1, b = val2 etc.. me Tag: Dataset Relations Tag: 59279
  - 18
    - Displaying constraints How do i display the constraints that a table has..i'm using oracle 9i....I wish to display all the constraints that a table has... Tag: Dataset Relations Tag: 59269
  - 19
    - Image datatype in SQL eqivalent in .NET? I am reading a SQL server datatype "image" field from a SQL server table. What .NET datatype should I convert it into? That is, what is the officially correct/best type to convert into? I am currently working with the sample pubs database. I have a reference to a single DataRow in the table 'pub_info'... DataRow dr = ....<bunch of code> object fieldValue = dr["logo"]; System.Drawing.Image imgLogo = (System.Drawing.Image)fieldValue; // ???? My guess just looks to simple. Does anyone know for sure? Michael Tag: Dataset Relations Tag: 59258
  - 20
    - SQL Connections .Net SqlClient Data Provider When using the trace log set to audit login information when debugging connections I observed that my connection through asp.net event class audit logout doesnt happen as soon as I call .close or even .dispose. It happens after several minutes I am supposing when the connection times out. Why? Why is the connection not being closed. The audit logout event doesnt happen right after the audit login when I am actually closing the connection immediatly. EXPLANATION PLEASE. Tag: Dataset Relations Tag: 59255
  - 21
    - SELECT FROM tablename containing space? I've written a generic code generator that generates classes with properties based on table names and fields. I'm just now testing it with the Northwind database. One of the tables is named "Order Details". I have to remove the space or replace it with an underscore for the class names. How do I qualify the table name in my SELECT statement? Single quote? Select * FROM 'Order Details' ?? I couldn't find this in the help files. Mike Tag: Dataset Relations Tag: 59254
  - 22
    - [VB.Net] Updating oledbdataadapter Hi, In vb.net, I have a dataset, which I make changes to. When I add a row and update the database, it's ok, but when I delete or edit a row, i get the following errormessage: "Object reference not set to an instance of an object." on this line: OleDbDataAdapter1.DeleteCommand.CommandText = "DELETE FROM Person WHERE Id='26'" In short, my update looks like this: Dim newdataset As New DataSet() newdataset = DataSet11.GetChanges Me.BindingContext(DataSet11, "person").EndCurrentEdit() OleDbDataAdapter1.DeleteCommand.CommandText = "DELETE FROM Person WHERE Id='26'" 'This is the line! OleDbDataAdapter1.Update(newdataset, "person") I hope someone can help me solve this (I've just updated from vb6 to vb.net) Thanks in advance! -- Lasse Tag: Dataset Relations Tag: 59253
  - 23
    - Saving Byte arrays via OleDb Hi, I am doing some crytpo stuff, and I want to store my key, IV and encrypted values (These are all generated as byte arrays) in a database table via a stored procedure and the OleDB namespace classes. I have tried sending them as binary and varbinary but I always get the same error: "Object reference not set to an instance of an object." I have confirmed the connection is working, so I don't really know where to go from here. If somebody has a suggestion of how I could get this to work I would really appreciate the help. Thanks, James Tag: Dataset Relations Tag: 59252
  - 24
    - parameters.add When using: objParameter = objCommand.Parameters.Add("@ResultsID", SqlDbType.Int) VS .Net does not recognize "SqlDbType". Yes I have imported the System.Data.SqlClient namespace. Does anyone know what i'm doing wrong? Tag: Dataset Relations Tag: 59250
  - 25
    - Databind to Treenode / Listview Item? Is it possible to databind the text property of both a treenode and listview item (windows forms)? I can't seem to find the appropriate solution for this. Tag: Dataset Relations Tag: 59249

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

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