Dataset mapping

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  - 1
    - Use a DataTable in place of a HashTable I have been using a HashTable to store name/value pairs, but now I need to add a third element (name/value/flag). I still need to be able to index by ["Name"], and I'd like to keep lookup speed as high as possible. I'm considering using a DataTable instead of the HashTable since I have to store the values to a database eventually anyway. It seems like the DataTable can do what the HashTable is doing in this case, but I'm concerned about efficiency. Does anyone happen to know the tradeoffs in using the DataTable instead? I was originally considering building both tables at the same time, but that seems unnecessary. Tag: Dataset mapping Tag: 81541
  - 2
    - View data in DataGrid I have this code to read a text file (.txt) and fill a dataset and then filter, using DataView, by user. The final result I want to put into a datagrig, but this last part is not happen and I don't know why. the code is below ------------------------------------------------------------------------ LerLinha = New StreamReader(LerPath) dsMrc = New DataSet dtMrc = New DataTable("Mrc") dcMrc = New DataColumn("Cod", System.Type.GetType("System.String")) dcMrc = New DataColumn("Data", System.Type.GetType("System.String")) dcMrc = New DataColumn("Hora", System.Type.GetType("System.String")) dtMrc.Columns.Add("Cod") dtMrc.Columns.Add("Data") dtMrc.Columns.Add("Hora") Do txtLine = LerLinha.ReadLine() If Not txtLine Is Nothing Then Cd = ProcessCod(txtLine) dtData = ProcessData(txtLine) dtHora = ProcessHora(txtLine) drMrc = dtMrc.NewRow() drMrc("Cod") = Cd drMrc("Data") = dtData drMrc("Hora") = dtHora dtMrc.Rows.Add(drMrc) End If 'dsMrc.Tables("Mrc").Rows.Add(drMrc) Loop Until txtLine Is Nothing dsMrc.Tables.Add(dtMrc) 'dsMrc.Tables("Mrc").Select("Cod='" & FindUser & "'") Dim strFilter As String Dim findRows() As DataRow Dim dtAux As DataTable Dim v As New DataView v.Table = dtMrc v.RowFilter = "Cod=" & FindUser v.Sort = "Data ASC" //this is my datagrid dgMarcacoes.DataSource = v LerLinha.Close() LerLinha = Nothing ------------------------------------------------------------------------ Could you help me???? -- Thank's (if you try to help me) Hope this help you (if I try to help you) ruca Tag: Dataset mapping Tag: 81538
  - 3
    - Problem with SqlCommandBuilder.DeriveParameters H I have the following code sqlConnection1.Open() System.Data.SqlClient.SqlCommand cmd = new System.Data.SqlClient.SqlCommand("[SOMEUSER].[PAK_TEST.P_OPEN]", sqlConnection1) cmd.CommandType = CommandType.StoredProcedure System.Data.SqlClient.SqlCommandBuilder.DeriveParameters(cmd) Since I don't know the parameternames in advance I need to call DeriveParameters to fill the Parameters collection on the SqlCommand object. Previously this has not been a problem since the OleDbCommand object does not need to know the name of the parameters. Iâ??m not very happy doing the extra roundtrip to the server getting the parameters, and it does not make it better that DeriveParameters bombs out when the stored procedure name contains periods. As you see in the code I try to derive parameters from [SOMEUSER].[PAK_TEST.P_OPEN] This is a perfectly valid Procedurename. When I call DeriveParameters it throws a System.Data.SqlClient.SqlException with the following message: "Could not find stored procedure ''. When doing a quick watch on the SqlCommand object after the exception I found that CommandText was changed to "[[SomeUser]]..sp_procedure_params_rowset". The same also happens if I try to set the commandtext of the sqlcommand object in designmode. It also magically changes the commandtext from [SOMEUSER].[PAK_TEST.P_OPEN] to [SOMEUSER].[PAK_TEST.[P_OPEN]], which of course is terrible wrong My conclusion is that DeriveParameters totally ignores all delimiters and will therefore never work correctly on stored procedurenames containing periods I guess this is a known problemâ?¦ Do you have a workaround or fix? Btw: Changing the procedure names is not an option Thank Xandu Tag: Dataset mapping Tag: 81534
  - 4
    - How to make a backup from vb.net Hi, I would like to add a backup function in my winform app. I use MSDE. My idea was to : Detach the database Copy the mdf and ldf file to the destination support Attach the database But I don't know how to detach and attach the database from vb.net Any idea ? Stan Tag: Dataset mapping Tag: 81531
  - 5
    - ReadOnly ComboBox Hi to all How can I make a ComboBox readonly ? Enabled = false and DropDownStyle = DropDwnList are not solutions for me. Thank you Dan Tag: Dataset mapping Tag: 81520
  - 6
    - ODBC Data Reader? Is the DataReader only for SQLServer or can it be used with ODBC? If so, is anyone aware of a sample out there? Tag: Dataset mapping Tag: 81519
  - 7
    - Help in calling Oracle Package from aspx page This is a multi-part message in MIME format. ------=_NextPart_000_001D_01C401B9.CFCC3260 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi, I'm, trying to call a package from my page to populate a datagrid. I'm = using an example from the web, but I can't get it to work. Here is my code: code in the aspx page: ... OracleConnection cnnOracle =3D new = OracleConnection(ConfigurationSettings.AppSettings["ConnectionString"]); = cnnOracle.Open(); OracleCommand oraCmd =3D new OracleCommand("{call = PACKPERSON.AllPerson({resultset 10,ssn,fname,lname})}",cnnOracle);=20 oraCmd.CommandType =3D CommandType.StoredProcedure; DataSet dstPerson =3D new DataSet(); OracleDataAdapter adpPerson =3D new OracleDataAdapter(oraCmd); adpPerson.Fill(dstPerson); this.DataGrid1.DataSource=3D dstPerson; this.DataGrid1.DataBind(); ... When I run my application I get the following error: ORA-06550: line 1, column 7: PLS-00103: Encountered the symbol "{" when = expecting one of the following: begin case declare exit for goto if loop mod null = pragma raise return select update while with <an identifier>=20 <a double-quoted delimited-identifier> <a bind variable>=20 << close current delete fetch lock insert open rollback savepoint set = sql=20 execute commit forall merge <a single-quoted SQL string> pipe=20 Any suggestion are welcome. Thanks Garfield ------=_NextPart_000_001D_01C401B9.CFCC3260 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 6.00.2800.1400" name=3DGENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=3D#ffffff> <DIV><FONT face=3DArial size=3D2> <DIV><FONT face=3DArial size=3D2>Hi,</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>I'm, trying to call a package from my = page to=20 populate a datagrid. I'm using an example from the web, but I can't = get it=20 to work.</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>Here is my code:</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>code in the aspx = page:<BR>...<BR>  =20 OracleConnection cnnOracle =3D new=20 OracleConnection(ConfigurationSettings.AppSettings["ConnectionString"]);&= nbsp;</FONT></DIV> <DIV> <P><FONT face=3DArial size=3D2>   = cnnOracle.Open();<BR>  =20 OracleCommand oraCmd =3D new OracleCommand("{call = PACKPERSON.AllPerson({resultset=20 10,ssn,fname,lname})}",cnnOracle); <BR>   = oraCmd.CommandType =3D=20 CommandType.StoredProcedure;<BR>   DataSet dstPerson =3D new=20 DataSet();<BR>   OracleDataAdapter adpPerson =3D new=20 OracleDataAdapter(oraCmd);<BR>  =20 adpPerson.Fill(dstPerson);<BR>   this.DataGrid1.DataSource=3D=20 dstPerson;<BR>   this.DataGrid1.DataBind();<BR>...</FONT></P> <P><FONT face=3DArial size=3D2>When I run my application I get the = following=20 error:</FONT></P> <P><FONT face=3DArial size=3D2>ORA-06550: line 1, column 7: PLS-00103: = Encountered=20 the symbol "{" when expecting<BR> one of the following: begin case = declare=20 exit for goto if loop mod null <BR>pragma raise return select update = while with=20 <an identifier> <BR><a double-quoted delimited-identifier> = <a=20 bind variable> <BR><< close current delete fetch lock insert = open=20 rollback savepoint set sql <BR>execute commit forall merge <a = single-quoted=20 SQL string> pipe </FONT></P></DIV> <DIV><FONT face=3DArial size=3D2>Any suggestion are = welcome.</FONT></DIV> <DIV><FONT face=3DArial size=3D2>Thanks</FONT></DIV> <DIV><FONT face=3DArial = size=3D2>Garfield</FONT></DIV></FONT></DIV></BODY></HTML> ------=_NextPart_000_001D_01C401B9.CFCC3260-- Tag: Dataset mapping Tag: 81518
  - 8
    - ReadXmlSchema into an existing DataTable Hi. I'm trying to read xml schema to a dataset that already contains datatable with the same name as the one in schema file and ReadXmlSchema has no effect. This console application in VB.Net demonstrates it: Module Module1 Sub Main() WriteSchemaFromNW() End Sub Private Sub WriteSchemaFromNW() Dim connection As SqlClient.SqlConnection Try Dim connectionString As String = "integrated security=SSPI;data source=localhost;persist security info=False;initial catalog=Northwind" connection = New SqlClient.SqlConnection(connectionString) Dim command As New SqlClient.SqlCommand("Select * from Orders", connection) Dim da As New SqlClient.SqlDataAdapter(command) Dim ds As New DataSet Dim dt As New DataTable("Orders") ds.Tables.Add(dt) da.Fill(dt) ds.WriteXmlSchema("c:\Orders.xml") dt = Nothing Dim ds1 As New DataSet, ds2 As New DataSet Dim dt1 As New DataTable("Orders") ds1.Tables.Add(dt1) ds1.ReadXmlSchema("c:\Orders.xml") ds2.ReadXmlSchema("c:\Orders.xml") Console.WriteLine("Reading schema into dataset with existing table") For Each tbl As DataTable In ds1.Tables Console.WriteLine(String.Format("Table {0} - number of rows = {1}, number of columns = {2}", tbl.TableName, tbl.Rows.Count, tbl.Columns.Count)) Next Console.WriteLine("Reading schema into an empty dataset") For Each tbl As DataTable In ds2.Tables Console.WriteLine(String.Format("Table {0} - number of rows = {1}, number of columns = {2}", tbl.TableName, tbl.Rows.Count, tbl.Columns.Count)) Next Catch ex As Exception Console.WriteLine(ex.Message) Finally If Not connection Is Nothing Then connection.Dispose() End If End Try End Sub End Module Any help is very appreciated. Thanks a lot - Predrag. Tag: Dataset mapping Tag: 81515
  - 9
    - Access to SQL 2000 I would like to write a program to convert Access tables to SQL 2000 tables. I could certainly write a program which collects each field in the access table and creates a similar field in SQL 2000 and then populates the file, however I am assuming that XML may offer a solution which would require only a few statements. Does anyone with XML expertise have an idea of this? Regards Tag: Dataset mapping Tag: 81513
  - 10
    - storing data locally? Hi, in a nutshell, is there a quick and efficient way of storing data from a database on each user's machine so that a WinForm application can query/analyze/do whatever it wishes to this local data? the winform app will never need to interact with the original database except the first time it is run - to create the local data files on each user's computer. From then on, each time a user runs the application, the app would be using the local data. I thought of saving the data as XML files... but I am concerned about efficiency. As well, I do not need the files to be viewed through other mediums (web, excel, etc.). Actually, I would prefer it if the local files are NOT viewable in other mediums... only the WinForm application would use the files. If I am able to query data in these local files using SQL (like "select myCol From file1.dat") that would be also be a huge plus.... I also thought of loading a DataSet object then serializing it to a file... any links/advice/help on this? I couldnt really find any specific examples/white papers on serializing data, but I am still looking. Any other suggestions? Thank you. Tag: Dataset mapping Tag: 81512
  - 11
    - Adding a datarow to datatable bounded to listbox. Please help! Hi, I have a problem with adding a datarow to datatable that is bounded to listbox. Here is what I am trying to accomplish: 1) Connect to access database and select table into dataset (works fine) 2) Create dataview of that table and bind it to listbox (works fine) 3) Add datarow to datatable containing information from some other source and the added datarow should automatically be displayed in listbox (having problem) 4) Update access table with new information... Here is how I add datarow to my datatable. drTo = dsStudents.Tables("ToStudents").NewRow() drTo("SomeColumn") = ... drTo("SomeColumn2") = ... dsStudents.Tables("ToStudents").Rows.Add(drTo) The thing is that datarow is actually gets added to the datatable but in the listbox it is appears as "blank". Now, if I add a second row after that, the first row now changes from "blank" to the one with information (Student's Name). But, now the second row is displayed as "blank". In other words the number of items that are in listbox are n-1 (1 is blank so total is n) and the number in datatable is n. So what do I need to do to get new added row to be displayed properly? I found a solution, to use this line of code: dsStudents.Tables("ToStudents").AcceptChanges() Now this works fine, however, the RowState changes from added to unmodified and calling Update method of DataAdapter would cause no rows to be updated since all rows are marked as unmodified. Is there another way I can get result that I want without using AcceptChanges() I appreciate your help! Tag: Dataset mapping Tag: 81511
  - 12
    - Common database code for Oracle, SQL Server, MS Access I am writting an application in VB.Net, as part of programming I realize that depending on what database I connect to Access, SQL Server or Oracle, I have to use a different SQL Query Syntax... and include different type of database libraries in my code In phase one we want to develop the app on MS Access and later on wants to migrate to Oracle or SQL Server. >>What do I need to do to write the code in such a way that I don't have to rewrite any code when I migrate the app from MS Access to SQL Server or Oracle? Can I just use ODBC connection all across? Will ODBC work on ACCESS from VB.Net? Thanks in advance -Raj Tag: Dataset mapping Tag: 81510
  - 13
    - Performance considerations Hi all I am currently designing a program that uses the ado.net. I have a question.. Which is better? To have your data constraints implemented on the dataset or constraints on the database? Or both Thanks a million Tag: Dataset mapping Tag: 81509
  - 14
    - ExecuteScalar return decimal instead of int? Hi When I use the ExecuteScalar and the sql looks like this "Insert ...; Select SCOPE_IDENTITY()" I get the return value as decimal - how can I cast it so it will return an integer? I use .net c# Thanks Tag: Dataset mapping Tag: 81505
  - 15
    - Looking for asp.net + mssql hosting Hi, I have several days looking for good alternatives to host asp.net sites that uses MsSQL Server. I found here several good comments about this site : http://www.webhost4life.com/, and seems very good. However I found this other, which really overpass the first one, regarding space and traffic allowance : http://www.securemate.com Also, the connection is very fast. The only things I see webhost is better than securemate is because they have more components included. Please, tell me where's the trick ? Could somebody compare their current hosting provider to this company and tell what are they missing ? Thanks in advance, Tag: Dataset mapping Tag: 81502
  - 16
    - Not Enough Storage We are receiving the following exception quite frequently in our application and was wondering if anyone could shed some light on this. Error Description: Not enough storage is available to process this command. Source: System.Data Stack Trace: at System.Data.SqlClient.SqlConnection.Open() This is ASP.NET corporate intranet website connecting to SQL Server using the Microsoft Data Application Block component. What causes Open() to issue this exception? Scott Lorenz Tag: Dataset mapping Tag: 81499
  - 17
    - Installable ISAM error message This code produces the "Could not find Installable ISAM" error message. Anybody have any suggestions? strConnectString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & strFilePath strConnectString += "Extended Properties=text;HDR=Yes;FMT=Delimited" Dim ds As New DataSet Dim da As New OleDbDataAdapter("SELECT * FROM " & strFileName, strConnectString) da.Fill(ds) I need to fill a dataset from a text file. Tag: Dataset mapping Tag: 81493
  - 18
    - Insert to SQL Server from a text file I am using vb.net and want to insert data from a .csv file into a table. I am looking everywhere but am coming up empty. Can someone be so kind as to post some sample code for me? Thank you. Mike B Tag: Dataset mapping Tag: 81488
  - 19
    - textbox databind problem I have DataSet with two DataTable and DataRelation between them. I have two DataGrids with master / detail style and additional textbox which are bind to detail table. ds.Tables.Add(tableCompany); ds.Tables.Add(tableBranch); ds.Relations.Add("Branch", ds.Tables["Company"].Columns["CompanyID"], ds.Tables["Branch"].Columns["CompanyID"]); this.gridCompany.SetDataBinding(ds.Tables["Company"], ""); this.gridBranch.SetDataBinding(ds.Tables["Company"], "Branch"); this.tbCode.DataBindings.Add("Text", ds.Tables["Company"], "Branch.Code"); this.tbStreet.DataBindings.Add("Text", ds.Tables["Company"], "Branch.Street"); Now if I update textbox tbCode of tbStreet and then click the update button which updates DT changes back to database nothing happens BUT if I after updating TextBox click the DG then it will update changes back to DB. How do I make so that the TextBox will update the DT immediately it loses focus? Do I need to use some refreshing code on TextBox.Leave event? Or some additional code on my Update button? Thanks, Oka Morikawa Tag: Dataset mapping Tag: 81486
  - 20
    - How to return SCOPE_IDENTITY as integer? Thanks Tag: Dataset mapping Tag: 81483
  - 21
    - Object reference not set to an instance of an object Hi All, I have an intermittent problem with an SQLDataAdapter.Fill command. Every now and then the system returns an "Object reference not set to an instance of an object" right after filling the Address table. Public Sub GetProfileTables(ByVal strSQL As String) Dim cnn As New SqlConnection("Server=localhost; Database=myDatabase; UID=user; PWD=password;") _profileSet = New DataSet("Profile") cnn.Open() 'Get the profile tables information ' The SQL statement would be something like SELECT * FROM vwProfile WHERE profile_key = 1110201 ' where the profile key basically is different depending on the record being viewed. Dim daProfile As New SqlDataAdapter(strSQL, cnn) daProfile.Fill(_profileSet, "Profile") _profileView = _profileSet.Tables("Profile").DefaultView 'Get the profile addresses strSQL = "select * from address where profile_key = " & _profileView(0)("profile_key") daProfile.SelectCommand = New SqlCommand(strSQL, cnn) daProfile.Fill(_profileSet, "Address") 'Define the parent and child columns Dim parentCol, childCol As DataColumn parentCol = _profileSet.Tables("Profile").Columns("profile_key") childCol = _profileSet.Tables("Address").Columns("profile_key") ' **THIS IS WHERE THE ERROR OCCURS** 'Define the relationship of the data Dim drProfile As DataRelation drProfile = New DataRelation("ProfileAddress", parentCol, childCol) _profileSet.Relations.Add(drProfile) cnnITT.Close() End Sub Any suggestions? Thanks Ryan Tag: Dataset mapping Tag: 81482
  - 22
    - Timeout Expired exception Hi, I have a question regarding the "Timeout Expired" excetpion. We have a database server running SQL 2000, and another computer accessing the database server using ADO.NET (via a CAT 5 cable directly). Occationally, I get a "Timeout Expired" exception tring to access database server. I do notice that the clock on the two computers may be drifted as far away as 6 minutes. Can this contribute to the timeout exception? In the sense of robust programming, what should I do in my code to survive these kind of exceptions? Thanks, Guogang Tag: Dataset mapping Tag: 81479
  - 23
    - using xsd and datasets with XmlDataDocument I have the following xml: <message> <envelope> <body key="" value="" /> </envelope> </message> I have associated an xsd to this xml in order to use the XmlDataDocument and give me the possibility to access the data through a dataset in the manner below specified: DataSet ds = XmlDataDocument.DataSet; When I try to add an element of type "body" to this xml file, this tag is added to the node "message" while I want to add it to the node "envelope". Here is the code which I use to do this task: DataRow dr = ds.Tables["body"].NewRow(); dr["key"]=126; dr["value"]="example"; ds.Tables["body"].Rows.Add(dr); and here is the resulting xml: <message> <envelope> <body key="" value="" /> </envelope> <body key="126" value="example" /> </message> while I want the following result: <message> <envelope> <body key="" value="" /> <body key="126" value="example" /> </envelope> </message> Last but not least when I try to get the attribute values of the node inserted in the xml by the previous code I don't have any problem even if the xsd doesn't allow a "body" tag out of the "envelope" tag. For example: foreach(DataRow row in ds.Tables["body"].Rows ) { if (row[0].ToString() == "126") { myVariable = row[1].ToString(); break; } } How can I avoid to append the node inserted by code to the root node using the dataset and its related classes ? How can I insert the new node correctly inside the envelope element (always using datasets) ? Every suggestion will be appreciate, thanks in advance Tag: Dataset mapping Tag: 81478
  - 24
    - How Deadlock are handled in ADO.NET Hello everyone, I want to know how it work in ADO.NET when a DEADLOCK occur and a victim is choosen? Is an exception raised? Thank's Carl Posted Via Usenet.com Premium Usenet Newsgroup Services ---------------------------------------------------------- ** SPEED ** RETENTION ** COMPLETION ** ANONYMITY ** ---------------------------------------------------------- http://www.usenet.com Tag: Dataset mapping Tag: 81476
  - 25
    - How to access .edb files I need to access the data in a .edb file, which is the type of database used by the Windows System Resource Manager, natively in my C# application. I can't seem to find a data provider that will connect to it, though. Although the WSRM stores the .edb file in a folder called "Jet DB", none of the existing Jet providers will connect to it (the usual Jet extension is .mdb) Does anyone know how I can access this data? Right now I have to open up the WSRM, manually export the data to a text file, and then work with it from there. It's not a very good permanent solution Thanks Jeff Tag: Dataset mapping Tag: 81467
- Next
  - 1
    - timout error on server running vb .net routine I'm getting the following error - not always, only randomly - when I run a certain routine (the routine is a simple executenonquery and it appears to complete despite the message) against sql server 2000: "timout expired. The timeout period elapsed prior to completion of the operation or the server is not responding" Anyone have any idea what causes this and how to avoid it? Thanks for any help. Bernie Yaeger Tag: Dataset mapping Tag: 81460
  - 2
    - Help with Net Provide for Oracle... Hello All I am using the 1.1 framework, and the Microsoft Oracle Provider for .net, and have oracle Client (8.1.7) installed The problem I am having is that I am querying an Oracle 7.3 Database, which does not support double-bit characters, but upon querying the database, it appears that all varchar2 fields are coming back as kanji or something, whereas dates and ints are returning correctly I have tried changing the connection string from unicode=true, even unicode=false, and not having it all all, but I still get the same results Also, I have connected using the typical OLEDB connection, which returns the data correctly, but would prefer the Oracle Provider for .net Any help would be great. Tag: Dataset mapping Tag: 81459
  - 3
    - ASP update to database, need sample or tutorial In preparation for an app that will be a simple ASP.NET page with about 40 text boxes I need sample to do the following: 1. Select the current data (done) 2. Bind to the textboxes (done) 3. When user clicks the update button the page will update the data in the database. Existing code: Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load 'Put user code to initialize the page here If Not Page.IsPostBack Then Me.SqlConnection1.Open() Me.SqlDataAdapter1.Fill(Me.TerrDataSet) Me.DataBind() Me.SqlConnection1.Close() End If End Sub The above works and shows the value of the fields in the text boxes. Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim picnt As Integer Me.SqlConnection1.Open() Try picnt = Me.SqlDataAdapter1.Update(Me.TerrDataSet) Catch ex As Exception Dim s As String = ex.Message End Try Me.SqlConnection1.Close() End Sub This code shows a count of 0 for the Update??? Tag: Dataset mapping Tag: 81458
  - 4
    - Thanks for everyone's feedback Looks like I've got a lot of reading to do : As I understand the concept of Singleton objects, they can only be instantiated once. Then, all other calls to that object rely on that previously created instance. If you have 300 hundred users, and each of them are doing multiple things (i.e. pulling data, executing stored procedures, etc..), and each time some communication to the data layer takes place, it must filter through that ONE instance (the Singleton obj) because IT is set up to be your data access object, then how does this architecture benefit you? Would it not become a bottle-neck due to their being only the one instance of it Tag: Dataset mapping Tag: 81455
  - 5
    - Dataset persistence Hi I'm relatively new to .NET technologies and basically I need this information. We would like to persist the data returned from a database and present the user in Excel/?/Customized GUI Application in order to make him to change the data. Finally all the data updated are to committed back in Database. I know data persistence is possible using dataset but can guide some kind of examples/cod Is it possible to present the persisted data in Excel or I have to build a customized application? Please some links/examples/samples please I appreciate your assistance TIA Holy Tag: Dataset mapping Tag: 81451
  - 6
    - passing comma delimited string in parameterized query Hello, I am having a problem with passing a comma delimited string as a parameter to be used in the IN() clause for a record selection. What I want to do is select all customer who have a surname that matches one in a specified list, which I pass in as a parameter to the query. I am working in VS.Net and through the designer set up a Sql Command object, the following is generated 'SqlCommand1 Me.SqlCommand1.CommandText = "SELECT * FROM Customer WHERE (SurName IN (@SurNameList))" Me.SqlCommand1.Connection = Me.SqlConnection1 Me.SqlCommand1.Parameters.Add(New System.Data.SqlClient.SqlParameter("@SurNameList", System.Data.SqlDbType.VarChar)). In my code I set SqlCommand1.Parameters("@SurNameList").Value = "Murphy,Sullivan,Lyons" I know there are customers with these surnames in the DB but my datareader is empty. I also have tried "'Murphy','Sullivan','Lyons'" but no good. Any suggestions very much appreciated, Thanks, Kay. Tag: Dataset mapping Tag: 81444
  - 7
    - Filter Data Hi gurus, How can I filter data in my DataSet and then put the result in a DataGrid? NOTE: I'm reading a txt file into a dataset with 3 columns: Id, Name, Age I have this: code------------------------------------------------------------------------ ----------------------- LerLinha = New StreamReader(LerPath) dsMrc = New DataSet dtMrc = New DataTable("Mrc") dcMrc = New DataColumn("Id", System.Type.GetType("System.String")) dcMrc = New DataColumn("Name", System.Type.GetType("System.String")) dcMrc = New DataColumn("Age", System.Type.GetType("System.String")) dtMrc.Columns.Add("Id") dtMrc.Columns.Add("Name") dtMrc.Columns.Add("Age") dsMrc.Tables.Add(dtMrc) Do txtLine = LerLinha.ReadLine() drMrc = dtMrc.NewRow() drMrc("Id") = ProcessId(txtLine) 'FindUser drMrc("Name") = ProcessName(txtLine) drMrc("Age") = ProcessAge(txtLine) dtMrc.Rows.Add(drMrc) dsMrc.Tables("Mrc").Rows.Add(drMrc) Loop Until txtLine Is Nothing Dim strFilter As String strFilter = "Id=" & FindUser dsMrc.Tables("Mrc").Select(strFilter) dgMarcacoes.DataSource = dsMrc LerLinha.Close() LerLinha = Nothing code------------------------------------------------------------------------ ----------------------- What's wrong?????? -- Thank's (if you try to help me) Hope this help you (if I try to help you) ruca Tag: Dataset mapping Tag: 81437
  - 8
    - CommandBuilder generates inproper SQL Statements Hallo, The SQL Statements the CommandBuilder creates never work. (Wrong INSERT INTO ...) To test this I created a new Access DB and a new application. I used the wizzard in the IDE and here is the result: --------- 'OleDbSelectCommand1 ' Me.OleDbSelectCommand1.CommandText = "SELECT ID1, Tabelle1, Tabelle2 FROM Tab1" Me.OleDbSelectCommand1.Connection = Me.OleDbConnection1 ' 'OleDbInsertCommand1 ' Me.OleDbInsertCommand1.CommandText = "INSERT INTO Tab1(Tabelle1, Tabelle2) VALUES (?, ?)" Me.OleDbInsertCommand1.Connection = Me.OleDbConnection1 Me.OleDbInsertCommand1.Parameters.Add(New System.Data.OleDb.OleDbParameter("Tabelle1", System.Data.OleDb.OleDbType.VarChar, 50, "Tabelle1")) Me.OleDbInsertCommand1.Parameters.Add(New System.Data.OleDb.OleDbParameter("Tabelle2", System.Data.OleDb.OleDbType.VarChar, 50, "Tabelle2")) ---------- The problem obviosly is the ? under VALUES. The CommandBuilder generates the same CommandText. Is the CommandBuilder worthless? Tag: Dataset mapping Tag: 81436
  - 9
    - Trapping SQL Error Generated In Trigger I have a .Net 2003 WinForms application. I have a form that uses a SQLDataAdapter along with a Stored procedure to make inserts to a table in my SQL Server 2000 database. The table has an Instead Of Trigger for Inserts that checks a business rule and either raises an error or makes the insert using the data in the Inserted table When the error is raised in the Trigger, it is not picked up by the SQlDataAdapter. My application procedes like the insert was made, but in actuality the server raised the error and the insert is not made. I also tried placing data in the insert that would pass the business rule but would cause a foreign key constraint violation. In this case the Trigger procedes with the insert using the data in the Inserted table but the insert fails and a foreign key contraint error is raised, but again my DataAdapter does not pick up this error and my application procedes as if the insert was made, even though it was not Does anyone know of a way to configure the DataAdapter so it will pick up errors either raiesed in a trigger or generated during the execution of a SQL statement in a trigger? The trigger is working fine and I have verified this by entering data directly into my SQL Table, in which case the errors are generated and displayed. Any help would be greatly appreciated. Here is my trigger code: [code ALTER Trigger trgHouseholdPrimaryChec ON tblHousehol Instead of Inser A Declare @Relation varchar(20 Declare @CaseId intege Set @Relation = (Select Household_Relationship From Inserted Set @CaseId = (Select Household_CaseId From Inserted Select Household_Id From tblHousehold Where Household_CaseId = @CaseId And Household_Relationshi = 'Primary Client If @@Rowcount > 0 And @Relation = 'Primary Client Begi RAISERROR(50001,16,1 en Els INSERT INTO [CaseManagement].[dbo].[tblHousehold]([Household_CaseId], [Household_Active], [Household_FirstName], [Household_LastName], [Household_MiddleName], [Household_SuffixName], [Household_Relationship], [Household_HomePhone], [Household_WorkPhone], [Household_ContactPhone], [Household_CellPhone], [Household_DateAdded], [Household_InactiveDate], [Household_MailStreetPo], [Household_MailAptNum], [Household_MailCity], [Household_MailState], [Household_MailZip], [Household_SSN], [Household_SecureRoom], [Household_FraudRisk], [Household_EmploymentTraining], [Household_WorkRestrictions], [Household_WorkLimitations], [Household_MaritalStatus], [Household_DOB], [Household_School], [Household_Grade], [Household_Felony], [Household_FelonyDetails], [Household_ParoleProbation], [Household_ParoleProbationOfficer], [Household_ParoleProbationAddress], [Household_ParoleProbationCity], [Household_ParoleProbationState], [Household_ParoleProbationZip], [Household_ParoleProbationDetails], [Household_BranchofMilitary], [Household_RankAtDischarge], [Household_MilitaryStartDate], [Household_MilitaryEndDate], [Household_DischargeType], [Household_Comments], [Household_UpdatedBy], [Household_UpdatedOn], [Household_CreatedBy], [Household_CreatedOn])SELECT [Household_CaseId] [Household_Active], [Household_FirstName], [Household_LastName], [Household_MiddleName], [Household_SuffixName], [Household_Relationship], [Household_HomePhone], [Household_WorkPhone], [Household_ContactPhone], [Household_CellPhone], [Household_DateAdded], [Household_InactiveDate], [Household_MailStreetPo], [Household_MailAptNum], [Household_MailCity], [Household_MailState], [Household_MailZip], [Household_SSN], [Household_SecureRoom], [Household_FraudRisk], [Household_EmploymentTraining], [Household_WorkRestrictions], [Household_WorkLimitations], [Household_MaritalStatus], [Household_DOB], [Household_School], [Household_Grade], [Household_Felony], [Household_FelonyDetails], [Household_ParoleProbation], [Household_ParoleProbationOfficer], [Household_ParoleProbationAddress], [Household_ParoleProbationCity], [Household_ParoleProbationState], [Household_ParoleProbationZip], [Household_ParoleProbationDetails], [Household_BranchofMilitary], [Household_RankAtDischarge], [Household_MilitaryStartDate], [Household_MilitaryEndDate], [Household_DischargeType], [Household_Comments], [Household_UpdatedBy], [Household_UpdatedOn], [Household_CreatedBy], [Household_CreatedOn] FROM Inserted [/code] All parameters and other properties of the DataAdapter have been set in desing mode. I removed the try-catch block that was trapping for a SQLException to see if that was the problem. Even without the try-catch no unhandled errors occur. Here is my update code: [code] Private Sub UpdateDataSet() Dim dtChangesHousehold As dsHouseholdView.tblHouseholdDataTable = New dsHouseholdView.tblHouseholdDataTable Me.BindingContext(Me.DsHouseholdView1.tblHousehold).EndCurrentEdit() dtChangesHousehold = CType(DsHouseholdView1.Tables("tblHousehold").GetChanges(DataRowState.Added Or DataRowState.Modified),dsHouseholdView.tblHouseholdDataTable) If (Not (dtChangesHousehold) Is Nothing) Then SqlDataAdapterHousehold.UpdateCommand.Connection = cnn SqlDataAdapterHousehold.InsertCommand.Connection = cnn SqlDataAdapterHousehold.Update(dtChangesHousehold) DsHouseholdView1.Merge(dtChangesHousehold) DsHouseholdView1.AcceptChanges() MessageBox.Show("Your updates have been successfuly submitted to the database!", "Database Update Successful!") Else MessageBox.Show("There are no updates to the Case data to submit!") Exit Sub End If End Sub [/code] Tag: Dataset mapping Tag: 81432
  - 10
    - ForeignKeyConstraint & GetChanges I've noticed that if I have an update in a child table with a foreignKeyConstraint that the parent table related row is not brought over when .GetChanges is called, thus breaking the foreignKeyConstraint. A full data relation with fix the issue but other than this scenario I will not make use of the data relation and was wondering if there was a to get the parent row in the table before I call get changes. I tried the ImportRow function to get the parent row into the dataset holding changes and then running ds.Merge(otherDS.GetChanges) but it still breaks the ForeignKeyConstraint. Any other ideas, or is the data relation the only way to go? Thanks, AJL Tag: Dataset mapping Tag: 81430
  - 11
    - quotes into SQL query I'm writing a class that crawls through a removable media retrieving file info (who didn't make one yet?) and storing in an Access mdb. OleDbCommand fails when the file name contains quotes as in My friend's pictures.zip When building the SQL INSERT query, I tried putting \" before and after as suggested in a MS KB but it didn't work. I'm almost going to escape the entire file name a la http... Should I use stored procs and pass the file name as a parameter? Would it avoid escaping the file name? Many thanks Henrique --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.608 / Virus Database: 388 - Release Date: 3/3/2004 Tag: Dataset mapping Tag: 81429
  - 12
    - ANN: Data Access Objects 1.3 released (GNU LGPL) Hi all I'm pleased to announce the latest release of my Data Access Objects. The library was released under the LGPL which means that you can use it in commercial applications. At a glance: - Vendor independent relational data access layer - Automation through Persistence Containers that operate upon the data access layer - Object-relational mapping through a Visual Studio add-in (XML files) or custom attributes Visit the project site @ http://dao.sourceforge.net Regards Philipp Tag: Dataset mapping Tag: 81428
  - 13
    - deleting rows from a table that has a composite primary key hi all i am new to the c# language . i would like to know that how would you delete a row on the basis of its primary key in a table which has composite primary key And also tell me how would you delete rows from a table which is inter-related to the other one , i mean if u have the foreign key in the other tabel and u want to delete the row in the table which has the primary key then how wud u delete the both Is it that u have to delete in the primary key table and the foreign key table separatel Thanx in Advanc Tag: Dataset mapping Tag: 81427
  - 14
    - Multiple statements with one command using System.Data.OracleClient I am writing a dataaccess layer in which am building my SQL statements dynamically. Currently i am using the Oracle classes in System.Data.OracleClient but executing muliple statements does not seem to work. What i try to do is something like INSERT INTO A (.. ) VALUES (:a ); SELECT * FROM A WHERE .. = :a; INSERT INTO B ( ... ) VALUES (:a) so I have one row in my dataset and want to split this row out into multiple tables reading back the record in between to get the values that are updated using triggers. This is no problem using the SqlClient classes but the Oracle implementation does not seem to support this. It seems to be a limitation in the Microsoft implemetation. Did anyone try to get around this problem using anonymous procedures? So for instance BEGIN UPDATE A SET "a" = :a WHERE (a = :OriginalA); SELECT * FROM A WHERE (a = :OriginalA); END; results in the following error "ORA-06550: ... :PLS-00428: In this SELECT-statement an INTO-clausule must be used. ORA-06550: ... PL/SQL: SQL Statement ignored.". Does anybody have a solution for this problem? Has anyone tried using mulitple statements while making use of ODP.NET (or alternatively with the DataDirect Data Provider?) Any help would be greately appreciated. R. van Poelgeest (just remove the spaces to get my email address) @ metaobjects.net Tag: Dataset mapping Tag: 81416
  - 15
    - Error Creating TXT File Private Sub find_file(ByVal strFile) Dim Path As String Dim NewFile As StreamWriter strFile = "Extern\" & strFile Path = Server.MapPath(strFile) If Not File.Exists(Path ) Then NewFile = File.CreateText(Path ) NewFile .Close() End If End Sub I have this to find (and create, if not found) a file. The problem is that it's not working. It gives me an error like this: Access to the path "c:\(all path)\Extern\novo.txt" is denied I think that I have to set permissions, but where??? I already put the Read an Write Permissions for that application in IIS, and in the right path too. How can I set this up? It's missing anything? -- Thank's (if you try to help me) Hope this help you (if I try to help you) ruca Tag: Dataset mapping Tag: 81411
  - 16
    - Could not add to Oracle DB with dynamic SQL Hi all, I want to use dynamic SQL to add a new dataset to an existing Oracle Table. The table is 'CONTENTTYPE' and contains only 1 field named 'CONTENTTYPE' which is Char(100). When I create the SQL-String manually' (see example below, for 'boolDynamicSQL = False') everything works fine and the new value is added. But when I try to use Dynamic SQL it always returns an error: ORA-01036: Variablenname/-nummer ungültig (= ORA-01036: Variable name /-number invalid) I could not find any typing error, and the manual SQL-String works fine :-( I've searched lots of internet sites but without access. Also my 'ASP.NET Codebook' states it should be working this way... Anyone any ideas? Could this be caused by single / double quotes? I did not find a setting in Visual Studio.NET to define which quotes .NET should use for the dynamic SQL. But when I replace the single quotes in the manual SQL string with double quotes, it returns 'ORA-00984: column not allowed here ', so not exactly the same error message. (By the way, one time error message is english, and in other case it's german. Might this be a hint?) Thanks in advance!! Private Sub btnSubmit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSubmit.Click REM First check whether Application name is entered Dim cnnORA As OracleConnection Dim comORA As OracleCommand Dim DR As DataRow Dim dtContentType As DataTable Dim ds As DataSet Dim sqlCommand As String Dim sqlInsertCommand As String Dim boolDynamicSQL As Boolean Dim da As OracleDataAdapter Dim boolUpdate As Boolean 'Added for checking Dynamic SQL boolDynamicSQL = True If txtContentType.Text = "" Then boolUpdate = False ASPNET_MsgBox("You have to enter a Content Type!") Else REM Check whether this application name already exists cnnORA = New OracleConnection(Oracle_Connection_String) cnnORA.Open() comORA = New OracleCommand comORA.Connection = cnnORA ds = New DataSet sqlCommand = "SELECT CONTENTTYPE FROM CONTENTTYPE" comORA.CommandText = sqlCommand da = New OracleDataAdapter(sqlCommand, cnnORA) da.Fill(ds, "CONTENTTYPE") dtContentType = ds.Tables("CONTENTTYPE") boolUpdate = True For Each DR In dtContentType.Rows If txtContentType.Text.ToUpper = _ (Convert.ToString(DR.Item("CONTENTTYPE")).ToUpper) Then boolUpdate = False Exit For End If Next If boolUpdate Then REM Add new data to database If boolDynamicSQL Then sqlInsertCommand = "INSERT INTO CONTENTTYPE (" & _ "CONTENTTYPE) VALUES (@CTYPE)" Else sqlInsertCommand = "INSERT INTO CONTENTTYPE (" & _ "CONTENTTYPE) VALUES (" End If Dim comInsert As New OracleCommand comInsert.Connection = cnnORA comInsert.CommandText = sqlInsertCommand DR = dtContentType.NewRow() DR("CONTENTTYPE") = txtContentType.Text For Each objColumn As DataColumn In dtContentType.Columns If boolDynamicSQL Then Dim param As New OracleParameter param.OracleType = OracleType.VarChar param.Direction = ParameterDirection.Input param.Value = "value" param.ParameterName = "@CONTENTTYPE" param.DbType = DbType.AnsiString comInsert.Parameters.Add(param) 'ORA-01036: Variablenname/-nummer ungültig Else sqlCommand = Convert.ToString(DR(objColumn.ColumnName)) sqlInsertCommand = sqlInsertCommand & _ "'" & sqlCommand & "', " 'Mit Double Quotes: 'ORA-00984: column not allowed here End If Next If Not boolDynamicSQL Then sqlInsertCommand = Left$(sqlInsertCommand, Len(sqlInsertCommand) - 2) & ")" comInsert.CommandText = sqlInsertCommand End If Try comInsert.ExecuteNonQuery() Catch ex As Exception LblResponse.Text = ex.Message End Try Else ASPNET_MsgBox("ContentType already exists. Please choose another name " & _ "or update existing data.") End If End If cnnORA.Close() End Sub Tag: Dataset mapping Tag: 81410
  - 17
    - AS400 invalid token Ji, i've a simple but strange problem. I must connect to an AS400 from a window form in C#. I use the Data Access of IBM as OLE DB driver and it works good but not with a library calle Â§DATAACCOUNT. The error sais "Token error" . Could someone tell me how coding the character 'Â§' to send it to AS400 ? Thanks in advance Tag: Dataset mapping Tag: 81406
  - 18
    - How do I query a dataset? Hello, I get how to populate a dataset by querying a database server... but once I've populated my dataset, say with several related tables, how can I then select records from the dataset copy of data using SQL statements instead of the database server itself? In some cases I'd say this is preferable to hitting the database server everytime a subset of data needs to be retrieved. Only suitable for small amounts of static data of course. As an example if I have a populated table of employee data in a dataset and I want to populate a temp table with only those records where employee age > 60..... am I limited to filters or can I use SQL statements (which would then mean no extra code if I decided to point back at the database server instead of the dataset itself)....? Hope this makes sense to you guys... cheers Tag: Dataset mapping Tag: 81390
  - 19
    - INSERT a datetime using convert Hallo I have an SQLCE database into which I want to insert a datetim INSERT INTO ADR_ADDRESS (Last_Edited) VALUES ( Convert('01-FEB-2004 11:12:22','dd-mon-yyyy hh:mi:si') The table was defined wit CREATE TABLE ADR_ADDRESS ( Address_ID integer Primary Key NOT NULL ,Last_Edited datetime Unfortunately this does not work, can anyone see what is wrong Thanks.. Nigel.. Tag: Dataset mapping Tag: 81388
  - 20
    - DataSet.Update on related tables. Hi all. Could anyone help me with the following "common" chalenge? I have 2 simple tables. Customers and Zipcodes. Customer: CustomerID, CustomerNr, CustomerName, ZipID ZipCodes: ZipID, ZipCode, ZipText I use the ZipID in the Customer table so if it changes I can change it for all Customers with that ID. Everey time I show this data in a grid I JOIN to the ZipID and shows the ZipCode to the users. That works OK. What I want to do i to use a dataset connected to a datagrid where the user kan massupdate zipcodes. As you know the user don't know the ZipID that I need to update the customer field with. He just want to change the ZipCode on all the customers and push Update. I need to find the corresponding ZipID and fill that into the corresponding Customer. Is there anyway this can be incorporated into the dataset so I don't have to check and test and lookup ZipID's. Mabe with some hidden columns or something. Short Version: When the user changes ZipCode in the datagrid I want to save the corresponding ZipID on that Customer. I would thing this scenario is rather common but.... I uses stored prosedures to fill and update all data in the database so I guess I could handle it there based on the ZipCode, but if there are anything within .NET that handles this I would like to use it. Thanks a lott all. -gh Tag: Dataset mapping Tag: 81386
  - 21
    - Dataset From Textfile question I have created at Dataset from an OleDB connected text file using schema.ini and so forth, so far no problem, now what I need to do is take the data from that dataset and update records in another database, (SQL Server) which has a table that contains the same key as I used in the text file. I have been able to walk through the first dataset and issue update commands to the other database one at a time, but I can't help feeling there has to be an easier way to do this. I am trying to avoid walking through either the file with file IO commands or the dataset one row at a time in favor of a batch operation. The data in the text file will always be used to update records that exist in the target SQL Server database, never to insert a new row. Any suggestions? I am writing this as a Winforms app in VB.Net with 1.1 Framework. Thanks in advance. Bob Porter Tag: Dataset mapping Tag: 81382
  - 22
    - Oracle stored procedure with db link doesn't work from C#? Hi I am calling an Oracle stored procedure which has no input or output parameters, and only does an insert to a table on a remote Oracle server, like this PROCEDURE Joe_test I BEGI insert into leslie@acc_db2 values ('insert') commit END When I call it from C# using System.Data.OracleClient, I get the exception ORA-02041: client database did not begin a transactio ORA-06512: at "OPS$JOE.JOE_TEST", line ORA-06512: at line If I change it to insert into a local table instead of a remote one, it works. If I run it as is from SQL/Plus, it works. It only fails when I run it from .NET with System.Data.OracleCommand.ExecuteNonQuery() I have tried using "enlist=false" in the database connect string. This actually seems to solve the problem if I use ODP instead of System.Data.OracleClient, but has no effect with the latter. I don't have a good understanding of what it does other than changing the default handling of distributed transactions. System.Data.OracleClient is supposed to handle distributed transactions I would appreciate any help or suggestions! Tag: Dataset mapping Tag: 81376
  - 23
    - Act! connection I am only able to connect to an Act6.0 db with ODBC Connection (Foxpro DSN). Is there a better way? Tag: Dataset mapping Tag: 81374
  - 24
    - paging with related records I'm trying to implement paging in a windows form application on about 50 thousand records the problem is I have related records, which is another 20 thousand. I've searched with google and only found paging but with none related data. http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/html/cpconpagingthroughqueryresult.asp Right now I can only think of one solution where I populate the related data by hitting the database after loading the paged data of the first table? Any other ideas? Tag: Dataset mapping Tag: 81373
  - 25
    - DataAdapter.Update - batch or round trips? Hi - I've seen several clues to this but I wonder if any experts can definitively confirm ...... Does the DataAdapter.Update method pass all updated datarows to the database for some kind of batch process with multiple calls to the update command but only one open and close of the connection, or does it do multiple round trips to the database and multiple connection open/closes, one for each updated datarow? (My specific interest is in the OracleDataAdapter but I'm guessing the answer applies to all DB providers). Thanks for any responses. Tag: Dataset mapping Tag: 81367

Hi all,

Is it possible to read data from one database table into a dataset,
apply a sort of mapping scheme to the dataset and update two other
database tables with the data from the source table?

If yes, how can this be achieved?

Thanx,
Klaas

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Re: Dataset mapping by Jason

Jason
Fri Mar 05 07:08:30 CST 2004

You could load all three tables into a dataset and set DataRelations on
each. MSDN has plenty of documentation on how to do this.

Jason Bentley

"Klaas" <hemerijckxk@spector.be> wrote in message
news:a54c3e5c.0403040405.1800b3d@posting.google.com...
> Hi all,
>
> Is it possible to read data from one database table into a dataset,
> apply a sort of mapping scheme to the dataset and update two other
> database tables with the data from the source table?
>
> If yes, how can this be achieved?
>
> Thanx,
> Klaas

Top