Deleting rows in dataset

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  - 1
    - Access queryDef as stored procedure in the 'Access Cookbook' by Getz, Litwin and Baron, it shows how to get a qryAlternativeAlbums query as an OleDbDataReader: 'Construct an OleDbCommand to execute the query Dim AltRock as OleDbCommand = _ New OleDbCommand("qryAlternativeAlbums", cnx) 'Odd as it may seem, you need to set the CommandType 'to CommandType.StoredProcedure. cmdAltRock.CommandType = CommandType.StoredProcedure 'Run the query and place the rows in an OledbDataReader. Dim drAltRock as OleDbDataReader drAltRock = cmdAltRock.ExecuteReader 'Bind the OleDbDataReader to the DataGrid dgrAltRock.DataSource = drAltRock dgrAltRock.DataBind() As an Access developer, this was exciting news, as I thought I presently had no way to use joins to Union queries, etc... Anyhow, I was wondering if I can use the DataAdapter in the same fashion? Please help me get any kinks out if this is possible. And if not, how can I parameterize a DataReader - is this possible? Tag: Deleting rows in dataset Tag: 122946
  - 2
    - Updating - let me count the ways There are several ways of updating a database through ADO.Net 2. In my case, I'm interested in using queries to update my Access data. I'm not sure what all the pros and cons are for each method. Below I've listed what I know, I'd welcome some discussion. And some correction on the 'terms' if required For my examples, I have a table called Weeks. This table has a boolean field, PastWeek. I wish to set this to true for all weeks prior to a supplied week number. Which one do you use? Whats the fastest to run? Thanks Vayse __________________________________________________________________________ 1) TableAdapter Where one opens the xsd file, right clicks on the table adapter, and clicks on Add Query. For my example, I create a query called SetPastWeeks, as follows UPDATE Weeks SET PastWeek = True WHERE (WeekID<= ?) To use this in my code, I would do Me.WeeksTableAdapter.SetPastWeeks(lNewWeekID) Pros: Easy to setup Easy to test - you can run the query in the xsd window. (what is the correct term for xsd window?) Its easy to use Cons: I guess its slower, but I don't know for sure. __________________________________________________________________________ 2) Commands and Dymanic SQL Using connection As New OleDbConnection(stConnection) connection.Open() Dim stSQL as string = "UPDATE Weeks SET PastWeek = True WHERE WeekID<= " & lNewWeekID Dim command As New OleDbCommand(stSQL, Connection) Dim lRows = command.ExecuteNonQuery() End Using Pros/ Cons: I'm not sure! __________________________________________________________________________ 3) Commands and Access Query That is, create the query in Access, then run it via your code. Now that I think about it, I'm not sure how to pass a parameter to such a query! Anyway, running it should be the same at the Dymanic SQL. I don't know what advantages this has over method 2, but it can make your code trickier to debug. __________________________________________________________________________ 4) DataAdapter To keep the code short, I won't add the parameters to the command. Dim dbConn As New OleDbConnection(stConnection) dbConn.Open() Dim stSQL As String = "SELECT * FROM Weeks" Dim daWeeks As New OleDbDataAdapter(stSQL, dbConn) stSQL = "UPDATE Weeks SET PastWeek = True WHERE WeekID <= 9" Dim command As New OleDbCommand(stSQL, dbConn) daWeeks.UpdateCommand = command daWeeks.UpdateCommand.ExecuteNonQuery() Tag: Deleting rows in dataset Tag: 122939
  - 3
    - Newbie Client-Server select Query Question It might be a very basic question, but I don't the answer. Please clear my boubt. From the client system when we execute "select * from Employee" where does the execution takes place. Does it execute it at server or at client. Do we need to have a high power client to do any queries. Please Help, Andy Tag: Deleting rows in dataset Tag: 122936
  - 4
    - Can't open two DataReaders to the same connection I don't know if I am outdated or is my grouse still valid. I am trying to connect two concurrent DataReader objects to the same connection, but the attempt fails with the error "Another DataReader is already open, it needs to be closed.. bla..bla.." Using good old ADO I could connect as many Recordsets I wanted through one connection, so how come ADO.Net is not allowing me to connect two DataReaders? I think I read somewhere that this can be done through .Net Framework 2.0. Is this true? How stable is .Net 2.0? Are there any big issues that I should know about? My application will be distributed as a packaged software, so it should be as stable as possible. Please do send me your ideas. Thanks Cyril Gupta Tag: Deleting rows in dataset Tag: 122924
  - 5
    - Specify alternative base class for strongly-typed DataSet Our application, currently in .NET 1.1, uses strongly-typed DataSets as business objects. These have been created using a third-party generator (from AdoGuy.com) which reproduced the standard Microsoft STD code, but added a couple of extra things to make deriving from the generated DataSet/Table/Rows work properly. The generator was open-source, and I modified it to allow me to specify different base classes for the DataSet/Table/Rows, so I could add common functionality there-in. So now we want to move the project into 2.0, and the original motive for the alternative generator no longer exists, because STDs are declared as partial, so business logic can be added in a separate file. But I now have a lot of code in my alternative base classes, which would have to be duplicated in each and every DataSet/Table/Row. We've got half a dozen DataSets, with an average of eight tables in each, and I expect to create another half a dozen over the next year, so that'd be a lot of work. (Of course, when C# 3.0 appears, I could just use an extension method, but I can't really wait another two-to-three years...) What I'd like to do is find a way of changing the base classes in the generated code as easily as possible. Does anyone know of a third-party DataSet generator that will let me do this? Alternatively, how feasible would it be to write a VS2005 plug-in to change the base classes in the generated code, preferably automagically after the MS generator runs when the XSD is saved, but manually if necessary? I've also considered writing a plug-in to generate an additional partial class with the extra code in, but that would inflate the classes quite a lot. Or are there any other suggestions for a good way to achieve this? Any thoughts would be much appreciated. Oh, and Happy New Year. Mark Tag: Deleting rows in dataset Tag: 122923
  - 6
    - SqlServer Express, Firebird & stored procedure question I want to toy with an embeded database for shareware application. I would like to know better SqlServer as well. However, correct me if I'm wrong, but it seems that as much as I would like to play with SqlServerExpress it seems higly unfit to this kind of application for the following reasons: - +20Mb to the install plus strange question to answer (for the clueless user) - Even though SqlServer express is installed your consumer application could fail if the service is, for some reason, off. - Even though SqlServer express is up and running you might not have connect access right to it, or right to create a new (file based) database (if need to), or maybe the server name is not what you expect and it can't be guess (or could 127.0.0.1 be used?) Because of these problem I was thinking to use Firebird (real, embeded, file based, database engine). Is the Procedural SQl language of Firebird the same as SqlServer express? Would it grows my SqlServer understanding to play with Firebird? Tag: Deleting rows in dataset Tag: 122919
  - 7
    - Problem OLEDB Oracle with .Net 1.0 - Exeption when i have date fie Hi, We have one application that return the exception below, when retrieve any date fields: "Specified argument was out of the range of valid values. Parameter name: Hour, Minute, and Second parameters describe an unrepresentable DateTime." If change from OLEDB to Oracle Provider the exception disappear, however we canÂ´t change this application in this time. This application use .NET 1.0, Oracle 9.2.0.7.0 and OLEDB Provider. Could anyone help us show any solution or article for this problem? (Therefore i need show in my job) Thanks Tag: Deleting rows in dataset Tag: 122918
  - 8
    - data access block for ADo.NET 2.0 Does anyone know when the data access block for ADO.NET 2.0 will be released? (or has it - and i cant find it?) guy Tag: Deleting rows in dataset Tag: 122917
  - 9
    - Newbee: Help on child-parent relation and binding to Forms Hello, i'm a newbee to ADO.Net. I need to create a Form that contains values of a Childtable 'artikel' and the corresponding value of the field 'lieferant.firma' which connects through a FL-constraint to the table 'lieferant'. I tried to bind the realtion lieferantartiekel as the datamember to the Combobox. Doesn't work. Is there any hint how to solve this problem ? Thanks a lot. Thomas Tag: Deleting rows in dataset Tag: 122911
  - 10
    - Deleting a bound DataGridView row? I have a DataGridView which is bound to a dataset. When I delete rows from the DataGridView, should it delete the same rows from the dataset also? I have tried the following code, but apparently, the dataset isn't updated. Did I miss (understood) something? for(int i = 0; i < dataGridView.SelectedRows.Count; i++) { DataGridViewRow row = dataGridView.SelectedRows[i]; dataGridView.Rows.Remove(row); } Debug.WriteLine(myTypedDataset.myTypedDataTable.Rows.Count.ToString()); // Here, the count is the same as before the deletion, but when // accessing the dataTable rows, a // DeletedRowInaccessibleException occurs on the deleted rows Tag: Deleting rows in dataset Tag: 122910
  - 11
    - Connect to Foxpro Data (*.DBF) in VB.Net Dear All We are currently write a program to "Transfer" Data from old system. How can i connect to a set of DBF files by What is the connection string to connect the DBF? I have try this one but error. connstr = "Provider = VFPOLEDB;Data Source=" & "C:\ESS2001\DATA\" I have the following question? 1. Does [OleDBConnection] Object support DBF Files? or i should use [ODBCConnection] ? 2. Should I it a must to have a "*.dbc" file ? 3. I need to use ADO instead of ADO.Net in VB.Net ? Thank you for your help in advance! -- EricLun Tag: Deleting rows in dataset Tag: 122902
  - 12
    - Use ADO.NET to keep data between client and server in sync Hi, my server has a database table. I read this table on the server into a dataset and my client retrieves it through a webservice. No changes on the client and server happen. What's the best way to keep the data in sync? I want to avoid that I transfer the entire dataset all the time. Is there feature of ADO.NET which I can use to find changes and send just them? Thanks for any hint Anthony -- Anthony Malt Tag: Deleting rows in dataset Tag: 122900
  - 13
    - Random 'Invalid Row Handle' This is a multi-part message in MIME format. ------=_NextPart_000_0203_01C61032.6F29FDF0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hello, I am facing a weird problem using the DataReader. This is what my code looks like. --------------- Dim dbCommand As OleDbCommand Dim dReader As OleDbDataReader dbCommand =3D New OleDbCommand("SELECT * FROM CmpDet where = cmpDet_CompanyID =3D " & CurrentCompany.CompanyID, DBCompany) dReader =3D dbCommand.ExecuteReader 'Retrieve info from the database dReader.Read() 'Read the record 'Load the company details Try CurrentCompany.Address =3D dReader.Item("cmpDet_MailAddress") CurrentCompany.CompanyName =3D dReader.Item("cmpDet_CompanyName") CurrentCompany.City =3D dReader.Item("cmpDet_CityName") CurrentCompany.State =3D dReader.Item("cmpDet_State") Catch ex As Exception MsgBox(ex.Message) Stop End Try 'Empty the objects dReader.Close() dbCommand.Dispose() dReader =3D Nothing dbCommand =3D Nothing --------------------- My problem is that on the dReader.item("cmpDet_MailAddress") line (When = I try to read the contents of the dReader object). I sometimes get an = error 'Invalid Row Handler'=20 This error does not occur all of the time, only some of it. Could it be = because the records that the dReader retrieves were added to the db in a = line just above this code block? I am using a dbCommand object with an = "INSERT INTO" query to add the contents to the DB so I expect that there = should be no problems retrieving data. This error only occurs some of the time, and at other times it runs = fine. Any clues why this could be happening? Thanks Cyril Gupta ------=_NextPart_000_0203_01C61032.6F29FDF0 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 6.00.2900.2802" name=3DGENERATOR> <STYLE></STYLE> </HEAD> <BODY> <DIV><FONT face=3DVerdana size=3D2>Hello,</FONT></DIV> <DIV><FONT face=3DVerdana size=3D2></FONT> </DIV> <DIV><FONT face=3DVerdana size=3D2>I am facing a weird problem using the = DataReader.</FONT></DIV> <DIV><FONT face=3DVerdana size=3D2></FONT> </DIV> <DIV><FONT face=3DVerdana size=3D2>This is what my code looks = like.</FONT></DIV> <DIV><FONT face=3DVerdana size=3D2></FONT> </DIV> <DIV><FONT face=3DVerdana size=3D2>---------------<BR></FONT><FONT = face=3DVerdana=20 size=3D2>Dim dbCommand As OleDbCommand<BR>Dim dReader As=20 OleDbDataReader</FONT></DIV> <DIV> <P><FONT face=3DVerdana size=3D2>dbCommand =3D New OleDbCommand("SELECT = * FROM CmpDet=20 where cmpDet_CompanyID =3D " & CurrentCompany.CompanyID, = DBCompany)<BR>dReader=20 =3D dbCommand.ExecuteReader 'Retrieve info from the = database<BR>dReader.Read()=20 'Read the record</FONT></P> <P><FONT face=3DVerdana size=3D2>'Load the company=20 details<BR>Try<BR> CurrentCompany.Address =3D=20 dReader.Item("cmpDet_MailAddress")<BR> CurrentCompany.CompanyName = =3D=20 dReader.Item("cmpDet_CompanyName")<BR> CurrentCompany.City =3D=20 dReader.Item("cmpDet_CityName")<BR> CurrentCompany.State =3D=20 dReader.Item("cmpDet_State")<BR>Catch ex As=20 Exception<BR> MsgBox(ex.Message)<BR> Stop<BR>End = Try</FONT></P> <P><FONT face=3DVerdana size=3D2>'Empty the objects</FONT></P> <P><FONT face=3DVerdana = size=3D2>dReader.Close()<BR>dbCommand.Dispose()<BR>dReader =3D=20 Nothing<BR>dbCommand =3D Nothing</FONT></P> <P><FONT size=3D2><FONT = face=3DVerdana>---------------------</FONT></FONT></P> <P><FONT face=3DVerdana size=3D2>My problem is that on the=20 dReader.item("cmpDet_MailAddress") line (When I try to read the contents = of the=20 dReader object). I sometimes get an error 'Invalid Row Handler' = </FONT></P> <P><FONT face=3DVerdana size=3D2>This error does not occur all of the = time, only=20 some of it. Could it be because the records that the dReader retrieves = were=20 added to the db in a line just above this code block? I am using a = dbCommand=20 object with an "INSERT INTO" query to add the contents to the DB so I = expect=20 that there should be no problems retrieving data.</FONT></P> <P><FONT face=3DVerdana size=3D2>This error only occurs some of the = time, and at=20 other times it runs fine.</FONT></P> <P><FONT face=3DVerdana size=3D2>Any clues why this could be = happening?</FONT></P> <P><FONT face=3DVerdana size=3D2>Thanks<BR>Cyril=20 Gupta</FONT></P></DIV></BODY></HTML> ------=_NextPart_000_0203_01C61032.6F29FDF0-- Tag: Deleting rows in dataset Tag: 122887
  - 14
    - SQL Server Starting Points Greetings - Several of you were helpful in disuading me from using Jet in a prior post. I'm developing an application that needs a "person manager" attached to it, with typical interfaces like "add person" "edit person" "get list of people" plus some custom items. A few questions. I'm experienced in relational database design, access and .net, but not at all in sql server: 1. How steep is the learning curve on SQL Server? 2. Any suggestions for good materials on getting started (most of the documentation looks geared to those who are proficient with prior versions) 3. Any suggestions for how I can find a third party to get me started on this -- most of the solution providers listed online seem to be looking to do large turnkey packages. I'd be looking more for some part time development and mentoring consulting to get this launched and then back in my hands. Any ideas where I can find this (I'm just outside of NYC, fwiw). Thanks for any pointers/suggestions! kc Tag: Deleting rows in dataset Tag: 122883
  - 15
    - Copy just some rows from a datatable to another datatable. I have a datatable with a field in it that tells me where the data belongs (let's say the values are 'A' and 'B'). I want to split the table into two other tables where in one there are only the 'A' records and the other one has only the 'B' records. What's the easiest way to do it? I looked at a dataview but it has no copy, it has copyto. TIA - Jeff. Tag: Deleting rows in dataset Tag: 122870
  - 16
    - DataSet.Clear required before loading new data? Is a DataSet.Clear required before new data is brought into the dataset? I.E. daMyDataset.Fill(dsMyDataset) Can I simply refill the dataset with new data intended to totally replace the old data, or must I do a .Clear first? Thanks Rick Lederman Tag: Deleting rows in dataset Tag: 122869
  - 17
    - cool list of threads for clearing Software Interviews .NET Interview Questions http://blogs.crsw.com/mark/articles/2542.aspx http://www.geocities.com/dotnetinterviews/ http://blog.daveranck.com/archive/2005/01/20/3553.aspx http://www.dotnetspider.com/technology/exams/ExamsCategory.aspx?CategoryId=3 http://techinterviews.com/ http://www.certfaq.com/employment/e011.html SQL Server Interview questions http://vyaskn.tripod.com/microsoft_sql_server_articles.htm Java Interview questions http://www.allapplabs.com/interview_questions/java_interview_questions.htm Tag: Deleting rows in dataset Tag: 122845
  - 18
    - 2nd layer of filtering? I have a paramaterized command for a data adapter SELECT MRN, Name, Sex, DOB, SSN FROM dbo.Membership WHERE (MRN = @MRN or @MRN is null) AND (Name like @Name or @Name is null) AND (Sex = @Sex or @Sex is null) etc. The name of that result set is from a stored procedure called: qMembershipSelect for 1.4 million records, this ensures that the data will come up quickly because all I'm doing is filtering between 1-4 parameters. But after the first select is done, I'd like to apply additional filtering to that result set that weeds out other stuff like duplicate records and selects a true Current member: SELECT DISTINCT MRN, MemNAME AS Member, DOB, SEX, SSN, GROUP, SGR, [FROM-DT], [THRU-DT] FROM qMembershipSelect AS Y GROUP BY MRN, MemNAME, DOB, SEX, SSN, GROUP, SGR, [FROM-DT], [THRU-DT] HAVING [THRU-DT] Is Null Or [THRU-DT] In (Select Max(X.[Thru-Dt]) From qMembershipSelect As X Where X.MRN = Y.MRN And X.MRN Not in(Select Z.MRN From qMembershipSelect As Z Where Z.[THRU-DT] Is Null)) ORDER BY MemNAME, [FROM-DT] DESC; Obviously this 2nd layer of filtering wouldn't be so tedious to a smaller dataset as it would to 1.4 million records at the start. Are you able to do this in ADO.NET with a DataTable?... if not, how do you go about it? In DAO, what I would do is write the First Select Statement qdf.SQL = "Select...." That would become qMembershipSelect and then refer to the rewritten query as if it were a table. it would be nice if qMembershipSelect could be referred to with this complexity with another dataadapter? I don't see in ADO.NET being able to write complex SQL statements that refer to a DataTable (equivalent to a query in Access)? Tag: Deleting rows in dataset Tag: 122842
  - 19
    - Dataadapter produces error: Syntax error in INSERT INTO statement The code below loads an Access table with one row. It then adds a row and displays all this in a datagridview. So far so good. But when I use the dataadapter's update command to update the database table, I receive the following error: Syntax error in INSERT INTO statement The Insert statement as displayed by the debug,write line is: INSERT INTO Main (Id, Interval, Tutor1, Tutor2) VALUES (?, ?, ?, ?), which looks fine to me. Where is the problem? The Commandbuilder should have no problems with this simple setup. The code: Dim ds2 As New DataSet Dim da2 As New Data.OleDb.OleDbDataAdapter Dim dc As Data.OleDb.OleDbConnection = New OleDb.OleDbConnection dc.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=Test2.mdb" dc.Open() Dim StrSQL As String = "SELECT * from Main" Dim objCommand As New Data.OleDb.OleDbCommand(StrSQL, dc) da2.SelectCommand = objCommand Dim CB2 As Data.OleDb.OleDbCommandBuilder = New OleDb.OleDbCommandBuilder(da2) Debug.Write("CB: " & CB2.GetInsertCommand.CommandText) 'What it writes looks fine to me da2.Fill(ds2, "Main") Dim NewRow As DataRow = ds2.Tables(0).NewRow NewRow.Item("ID") = 254 NewRow.Item("Interval") = 22 NewRow.Item("Tutor1") = "Joe" NewRow.Item("Tutor2") = "Mary" ds2.Tables(0).Rows.Add(NewRow) Me.DataGridView1.DataSource = ds2.Tables(0) MsgBox("Got this far") da2.Update(ds2, "Main") 'Here is where the error occurs. Tag: Deleting rows in dataset Tag: 122841
  - 20
    - Code reuse and DataSet generation from XML schema Hello, I have several strongly typed DataSet classes that encapsulate the same table. My challenge is that I can't reuse the wrapper code for this table generated by Visual Studio, because although wrapper classes represent identical structures, they have different identities. If I have two strongly typed DataSets (DataSet1 and DataSet2) and both of them wrap a table MyTable, VisualStudio duplicate the code in .cs files, i.e. I get DataSet1.MyTableRow class and DataSet2.MyTableRow, so it is not possible to have a common method DoSomethingWithMyTableRow(MyTableRow row) - I have two different identities for MyTable row structures. Does anyone know an approach for code reuse in such cases? Thanks in advance Vagif Abilov Oslo Norway Tag: Deleting rows in dataset Tag: 122839
  - 21
    - Problem connecting to sql server Hi, I am using XP Pro SP2, VS.NET 2003 & IIS 5. I used to develop an ASP.NET application on my PC on my local IIS, connecting to a LAN server which hosts my MSSQL database. I have no problem running the web app locally. After I reformat and reinstall XP, I could not run the app anymore. The app could not find the SQL server. But I can connect to the server via Enterprise Manager installed locally and browse the tables. And I can even ping the server. I have tried using both IP and servername but to no avail. However, my machine can connect when I tried using normal windows application, using the same connection string. I think I am missing something bcos I used to have the same problem last time. But I forgot what is needed to be done on my machine to make it work. Tag: Deleting rows in dataset Tag: 122825
  - 22
    - use sql mdf from application folder Hi, I need to deploy my simple windows application to client's pc so that the database it requires is packaged along with it in the application folder. I have done it through the setup project but after installation it throws exception of being unable to acess the database. Please note that the client does not need to have SQL server installed. I have MS SQL Server Express and Developer Edition both installed on my m/c. I am using SQLEXPRESS for database connection strin in my project. My question is, does the client need to have SQL server installed on their system? TIA. Tag: Deleting rows in dataset Tag: 122821
  - 23
    - I'd like to programatically move through a table I'd like to programatically move through a table (call it a recordset in ADO ) and disply fields in a textbox. I've gotten as far as the code below (which just loads a listbox) I assume I need to work with the dataadaptor , but have been unable to find info on the web as to how to do it - the hope is to be able to work , record by record,; something like the .movenext capacity in the recordset objects of DAO and ADO. myConnection = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\t.mdb") myConnection.Open() 'myCommand = New OleDbCommand("select * from main", myConnection) Dim myDataAdapter As New OleDb.OleDbDataAdapter( _ "Select * from main", myConnection) Dim myDataSet As New DataSet() myDataAdapter.Fill(myDataSet, "main") 'Dim myReader As OleDb.OleDbDataReader Dim DataViewManager1 As DataViewManager = myDataSet.DefaultViewManager ComboBox1.DataSource = DataViewManager1 ComboBox1.DisplayMember = "main.First" Tag: Deleting rows in dataset Tag: 122820
  - 24
    - Problem using diffgram I'm use diffgarm xml (for update) which is sent with a schema with sqlxmlcommand whith sqlxml version 3 sp3. This mechanizem used ALL the parameters in the before xml as the parameters used in the where clause used by update commands to the data base. 1. Is there a way to limit the parameters used by the where clause only to spesific fields!!!? When I tried to send a diffgram which only contains some of the nodes deffined in the schema, the mechanizm automaticly fills the missing nodes with nulls and an update will use them with where clause with the value null change these nodes which were missing in before clause to null. 2. Is there a way only to send and change the sent data? Thanks, G. Tag: Deleting rows in dataset Tag: 122816
  - 25
    - Managing "Row ID" for Table Inserts Using c# and Visual Studio 2003, I've begun to wonder whether I'm adding rows to Oracle tables correctly. The tables often have "row ID" columns and, before adding a row, I pull the "max" ID value from a table, add 1 to it, and then use that number as the new "row ID" (the base table then gets updated, so the dataset and table are not long out of sync). I'm sure this approach is wrong, since, among other issues, the "max" ID returned could be wrong if, for instance, a recently-added row was deleted. I don't know, however, how else to do this. Should I instead use stored procedures? How can I add rows to my dataset tables and know what "row ID" the underlying table will expect during the row insert (especially with other users potentially hitting the database)? Thanks for advice. Tag: Deleting rows in dataset Tag: 122815
- Next
  - 1
    - SqlCeResultSet, why not in ADO.NET? I just discovered the SqlCeResultSet in the compact framework. It is more like ADO or DAO than anything else that I have seen as far as coding in a VB application goes. It appears to be very fast and efficient too! Is there any plan to place the resultset in ADO.NET? It just seems FAR easier to implement with fewer lines of code than creating a dataset. Rick Lederman www.soaringsoftware.com Tag: Deleting rows in dataset Tag: 122812
  - 2
    - History of Data Access Hi, I'm a novice programmer. When reading stuff on ADO.Net I often face terms like OLE DB, ODBC. Is there anyone who knows the web links that can provide me the concepts like these (ODBC,OLE DB and other concepts related to Data Access) that can be understood easily by a novice like me. If anyone, please give me those links. Thanks in advance, Regards, Swat Tag: Deleting rows in dataset Tag: 122790
  - 3
    - Generate DataSet in 2.0? I'm beginning to think Microsoft has spent the last few years revising .NET so as to break every single programming construct I've developed. Sheesh! Today, I'm trying to figure out where the Generate Dataset context menu option went in VS2005. I used to build quick and dirty config files -- which I could access through a Dataset -- by creating an xml file with dummy data, creating a schema from that xml file, converting the schema to a Dataset, and then selecting Generate Dataset. This created a "hidden" file containing an autogenerated class which I could then read my xml config data into via ReadXml(). Unfortunately, the Generate Dataset menu option has disappeared. Or been moved. And I can't find it. So how do I create a Dataset based on an existing xml file? - Mark Tag: Deleting rows in dataset Tag: 122788
  - 4
    - Philosophical question: how often to submit updates to database A concept I've waffled on from time-to-time with ADO.Net: how often to submit updates back to the database. For example, I have some CF apps where it's quite obvious the *when* part of submitting the update -- soon as you come off of the record. For other desktop apps, it's not quite so obvious. For example, I have a CRM app where there are dozens of fields for one customer record, as well as many different datatables for sales, appointments, etc.. So, I wonder: submit the update every time a single change is made or submit it only when a different customer is selected? The downside to the update for every single change is the obvious network/server overhead; the downside for waiting on a customer change is what if the app gets closed/crashes, etc? I'm not looking for a *right* answer here, just some opinions. Thoughts, strategies, ideas from others would be appreciated. Tag: Deleting rows in dataset Tag: 122775
  - 5
    - Jet vs. Sql Server Express Greetings - I'm working on a new application and need to select a database for it. I was wondering if anyone had any views on tradeoffs between going with Jet/Access vs. SQL Server 2005 Express. The database is going to sit on a server. I'm planning to implement .net remoting from my client objects to a wrapper around the database, so the database will be transparent to the distributed client apps. I'll also access the database for ad hoc reporting and data manipulation. I'm experienced with Access but haven't used SQL Server, so I would tend to lean toward using Access/Jet. However, it seems most of the attention is on SQL Server in everything I see about VS 2005. Is Jet still getting attention? What are the pros/cons of SQL Server vs. Jet? Thanks for any help kc Tag: Deleting rows in dataset Tag: 122772
  - 6
    - how do i connect to a remote database i have a website that i use to file all my clients information, the go online and they type the information. i'm using an microsoft access database. Now, i want to create a windows application that i can run whenever a want to transfer the new information that is on my website database to my local sql server database. I just want to know how do i make a connection to the database onlie using visual studio .net 2005 or if you have another option please let me know. Thanks. Tag: Deleting rows in dataset Tag: 122771
  - 7
    - exception on : ra = myCommand.ExecuteNonQuery() (VB Exoress 20005) I get an exception on this line : ra = myCommand.ExecuteNonQuery() {"ExecuteNonQuery requires an open and available Connection. The connection's current state is closed."} in this code: Dim myConnection As OleDbConnection Dim myCommand As OleDbCommand Dim ra As Integer myConnection = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\t.mdb") myCommand = New OleDbCommand("delete from main where last = 'freud'", myConnection) ra = myCommand.ExecuteNonQuery() MessageBox.Show("Records Deleted" & ra) myConnection.Close() whereas this code works fine : myConnection = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\t.mdb") myCommand = New OleDbCommand("select * from main", myConnection) Dim myReader As OleDb.OleDbDataReader myConnection.Open() myReader = myCommand.ExecuteReader Do Until myReader.Read = False MessageBox.Show(myReader("last")) Loop myReader.Close() myConnection.Close() Tag: Deleting rows in dataset Tag: 122758
  - 8
    - Books on ADO.NET 2.0? I would like to get a good book on ADO.NET 2.0. I searched Amazon and found 2 books that are rated well: - Pro ADO.NET 2.0 (Expert's Voice) - Programming Microsoft ADO.NET 2.0 Applications: Advanced Topics However, I am looking to learn about the "new" way of working w/ data... TableAdapter, BindingSource, etc. From the descriptions of the books, it kind of seems like these topics are not covered well, or at all. So my question is, what is a good ADO.NET 2.0 book that covers TableAdapters, BindingSources, etc.? Thanks! John Tag: Deleting rows in dataset Tag: 122754
  - 9
    - dataset columns with system.dbnull Hi everyone(happy new year!!), Well, here we go... I have a problem with datsets, ado.net as i understand ..I have a sp that in query analizer retrieve 13 columns and the last 3 like the others have data, but when i see the dataset which gets the data the last columns are system.dbnull, and here after several tests, i am begging your help guys...did anyone have this problem???? i ll be thankfull really for any help u can post... Thanks in advance... Tag: Deleting rows in dataset Tag: 122752
  - 10
    - Creating Schema In ADO.Net, can I create "create table ( ... )", "alter table ..." stuff, and execute it to create my schema for MS-SQL2000? Jack Tag: Deleting rows in dataset Tag: 122751
  - 11
    - How to use backgroupworker to load dataset? As the existing application is running very slow when start application, How to use backgroupworker to load dataset? Tag: Deleting rows in dataset Tag: 122750
  - 12
    - SqlExpress & C# problem in an ASP.NET web site I'm trying to create a SqlServer express database file on the fly in a web application.. (mhh.... maybe I should try to get something running in a desktop application first?) Anyway I want to connect to a database file and, if it doesn't exist, create the DB on the fly. Actuall I'm trying to create the connection like that: I'm trying to create a connection like that: === public static SqlConnection GetConnection(string filename) { string connString = @"Data Source=.\SQLEXPRESS;AttachDbFileName=|DataDirectory|{0}.mdf;Integrated Security=True;User Instance=True"; connString = string.Format(connString, filename); SqlConnection sqlc = new SqlConnection(filename); // <= exception here return sqlc; } === It fails with "Format of the initialization string does not conform to specification starting at index 0." mmh.. is it because the file doesn't exists? How am I to connect to SqlServer to run the SqlSever creation script if my file doesn't exist? Should I embed an empty database as a resource in my control library if I want to automatically create the database? Or is there an other way? (I have the creation Sql script ready, I just wonder how to run it).... Tag: Deleting rows in dataset Tag: 122741
  - 13
    - Conectar BD Hola a todos y Feliz año 2006: Tengo que crear una aplicación que accede a una Base de datos, y los datos cambian constantemente en las tablas de la Base de datos, esos cambio son nuevos registros. Hasta el dia de hoy estado utilizando el componente DOA para Oracle, y estoy permanentemente conectado a Oracle y cada vez que hay un nuevo registro automaticamente se actualizan todas las pantallas de los clientes. Cada cliente que utiliza la aplicación abre una conexión a Oracle y ésta es permanente, se cierra solo cuando sale de la aplicación. Ahora bien, en VS2005 como puedo hacer esto?? ya que aqui tengo en tendido que se trabaja en MODO DESCONECTADO. Ustedes, que me recomendarían?? como debo implementarlo con VS2005?? Agradecería mucho su valiosa ayuda. Un saludo a todos y que este 2006 sea de mucha alegria., amor pa todos. EWAT Tag: Deleting rows in dataset Tag: 122739
  - 14
    - About datatables Hi How to pass the content of one data table to another data table.I simply tried using assignment operator...Example: datatable1=datatable2...But,its not working.. ravindra Tag: Deleting rows in dataset Tag: 122730
  - 15
    - TableAdapter Performance Hi, Have anyone ever benchmark the TableAdapter performance compared to DataTable's Load method? I found out that the DataTable's Load method is about 10x faster than TableAdapter's Fill method. I used the same SELECT query and DataSet (predefined), for both test. For the DataTable's Load method, we first need to create a DataReader. Anyone know why? Or is there any other configuration needed to make TableAdapter faster? Thanks for reading. Tag: Deleting rows in dataset Tag: 122728
  - 16
    - How to bind an object to a table Hi, I am new to .net. I think .NET provides what I need, but I don't know how to implement it. What I need is simply associating an object with a database table. I would like to load "objects" from table, and I would like to modify or delete objects, without dealing with database in anywhere. In other words; I do not want to write SQL query for any of those operations. Let me give you an example (in C++/CLI): ref class MessageBase abstract { String^ m_strFrom; String^ m_strBody; String^ m_strSubject; DateTime m_dtRecSent; DateTime m_dtReplied; DateTime m_dtForwarded; MessageTypes m_mtType; public: property String^ From { String^ get(); void set(String^); } property String^ Body { String^ get(); void set(String^); } property String^ Subject { String^ get(); void set(String^); } property DateTime ReceivedDate { DateTime get(); void set(DateTime); } property DateTime RepliedDate { DateTime get(); void set(DateTime); } property DateTime Forwarded { DateTime get(); void set(DateTime); } property DateTime SentDate { DateTime get(); void set(DateTime); } property MessageTypes MessageType { MessageType get(); void set(MessageTypes); } }; I have got a table to store this information. I would like to load "messages" from table at startup, through a factory (another recommendation?). I have prepared a typed dataset, too, but I couldn't associate it with this class. What I have done previously in C++ was a simple adapter. Adapter was acting like a "message object" to the application itself, any changes in the object automatically goes database, too. As far as I have heard, after associating this class with a table, I will not write any SQL statement. I would be very happy, if you could enlighten me about this type of association. I am using .NET Framework 2.0 (of course, since I am using C++/CLI) and I do not have a performance concern with this operation (I have heard that this type of association of an object with a dataset is far slower than SqlDataReader way). Database is SQLite, I am using ADO.NET class library to access database from .NET (I have native library as well). Thanks! Jason Tag: Deleting rows in dataset Tag: 122721
  - 17
    - How to connect a DataView to an access database? Im trying to understand DataView, to make a couple of lists of sorted data. The 3 textbooks I have on .net dont have dataview in the index even. Ive started by doing a database wizard. it finds the .mdb file and formats the schema and genetated a program, I put a simple grid view in the form1 and pointed its source at the dataset. But now I have to use DataView. Ive tried making a DataTable, and assigning it to the dataset which only has the one table. I hook the dataview to a second gridView. It doesnt complain, runs fine, but there is no data in the gridView. I wired the gridView to the DataTable? still no data there. Im searching the docs on how to use the DataView, have an example, but the example builds up the table from scratch; I want to fill it with 2 specific columns from the one table in the .mdb database. Nothing Ive done gets the data into the 2nd gridView. I can manually add columns to it, but I want the data from 2 specific columns. Seems easy. Any suggestions appreciated. Tag: Deleting rows in dataset Tag: 122720
  - 18
    - newbie in search of ADO.NET code samples Can anyone point me to step by step walk-throughs of ADO.NET code - I'd like to get to the point of being able to programmatically work with assigning field data to text boxes and then write back changes to the tables. As an aside; I started playing with Visual Studio 2003, and now VB 2005 Express. I come out of Dbase/Clipper/Foxpro/Delphi/MSAccess/ PHP-MYSQL- and I must admit to being driven out of my mind with datasets and dataadaptors and datareaders - My eyes water -I just want the *data* - the levels of abstraction from the data itself have been driving me from the .net environment- and I'm sure I'm missing out on some good stuff - so far VB'05 has been no different in this way from VS '03 ; I need some simple -step -by -step working code to build on - the MS Books so far have lacked this, and the free training videos from MS only take me through a GUI approach , whereas I want *CODE* - any pointers to this greatly appreciated. (While I'm at this - I appreciate the cleverness in MS's disconnected approach to data - I do wonder however why a connected model (and thus a simpler one) could not have been offered as well - at least in the more amateur oriented (if I understand this correctly) VB 2005 Express ) Tag: Deleting rows in dataset Tag: 122719
  - 19
    - .NET 1.1 "System.Data.VersionNotFoundException" - I need a workaro I have three related tables, and I am getting an exception when : **************** Dim dataRows As DataRow() = ds.Tables(MappingName).Select_("", "",DataViewRowState.Added) dataAdapter.Update(dataRows) ****************** The exception is: {System.Data.VersionNotFoundException} [System.Data.VersionNotFoundException]: {System.Data.VersionNotFoundException} HelpLink: Nothing InnerException: Nothing Message: "There is no Original data to access." Source: "System.Data" StackTrace: " at System.Data.Common.DbDataAdapter.Update(DataRow[] dataRows, DataTableMapping tableMapping) at System.Data.Common.DbDataAdapter.Update(DataRow[] dataRows) at QuiltTrackDB.BaseSql.PersistChanges(DataSet ds, DataRowState rowState, SqlConnection conn, SqlTransaction tran) in C:\Projects\QuiltTrack\QuiltTrackDB\BaseSql.vb:line 594 at QuiltTrackDB.BaseSql.PersistAllChanges(DataSet ds) in C:\Projects\QuiltTrack\QuiltTrackDB\BaseSql.vb:line 186" TargetSite: {System.Reflection.RuntimeMethodInfo} I think the problem might be that the table that I am trying to insert a record into is the subject of a relational expression column for another table that I am also inserting to in the same transaction, so removing the expressions before persisting is my next attempt at a workaround. but any advice would be appreciated. (This bug was found in 1.1, but it is still there in 2.0) I have to say I am sorely disappointed in MS and what they have NOT managed to do over 5 or so years of ADO.NET - which is, to get the features they have long documented - expressions and filters, working correctly. David Rogers Fred Hutchinson Cancer Research Center Tag: Deleting rows in dataset Tag: 122716
  - 20
    - OracleClient in VS2005 ??? Hi, I am using VisualStudio 2005 (C#) and have to write a code to access Oracle Database. I know that in .NET Framework 1.1, I could download OracleClient namespace (System.Data.OracleClient.dll) and add referenct to it in my project. Can I do the same in VisualStudio 2005? When I look for OracleClient in msdn, it says it is only for .NET Framework 1.1. What can I use in .NET Framework 2.0? Any help will be appreciated, _dino_ Tag: Deleting rows in dataset Tag: 122714
  - 21
    - SQL Querry Hello, I trying to produce a querry that will accomplish the following and am not sure how to write the statement. I am currently using Jet 4.0 but will be using SQL Server soon. Example Records ID CustID Data Date Balance 1 1234 bla8 092705 42.00 2 2341 bla7 091405 14.00 3 3412 bla6 090205 32.00 4 4123 bla5 081805 65.00 5 3412 bla4 093005 34.00 6 2341 bla3 082705 19.00 What I want to accomplish is: Return Data, Date and Balance Where Max(ID) For CustID 3412 SELECT Data, Date, Balance Where Max(ID) AND CustID = '3412' The Querry should Return bla4, 093005, 34.00 Any Assistance is greatly appreciated. Chuck Tag: Deleting rows in dataset Tag: 122700
  - 22
    - Unexpected Timeout I have an application that connects to sql server. Two installs of the application are frequently experiencing the following error: "System.InvalidOperationException: Timeout expired." We've checked and confirmed that all connections are closed and disposed. The two sites that are having problems with it also receive a lower than average amount of traffic. I've had them check for deadlocked transactions and the maximum number of concurrent connections. If anyone has any other ideas on what else to check it would be appreciated. Thanks, Scott Tag: Deleting rows in dataset Tag: 122699
  - 23
    - Oracle Ref Cursor Issue in ADO.NET Hello, I ran into a performance issue with Oracle Ref Cursor in ADO.NET (with VS 2003). The SQL itself runs in less than 5 seconds in SQL*Plus. (Oracle 9i). When the same is called from ADO.NET using the microsoft provider for oracle (system.data.oracleclient.dll version 1.1.4322.2032), the fill method takes upto 5 minutes to fill the dataset. The result set returned is less than 100 rows and the row size is less than 200 characters. Any ideas why this might be happening. Tag: Deleting rows in dataset Tag: 122697
  - 24
    - Whatever happened to ... I seem to recall, back in the early promise days of Whidbey, that there was talk (and even an early version) of a set of classes for mapping data between objects and a database being a part of the release; alas I cannot remember its name. I know there are various ORM tools out there, and I may even look into some of them but can anybody tell me (a) what the Microsoft version was called when they were hyping it, and (b) what happened to it. Thanks. Tag: Deleting rows in dataset Tag: 122691
  - 25
    - Quirky response to Update command using datagrid Using VS2003 and SQL2k. I've noticed that if I have an expression column (or relation column) added to the main table, I cannot do an Update without setting the UpdatedRowSource to either OutputParameters or None. This works fine ... so long as we do not execute two Updates in the same row, one after the other. This causes a concurrency error. I understand the general idea behind concurrency and the raft of issues that can cause a "concurrency error" (did I mention that ADO.Net is SUPERB at spitting out "concurrency errors" if you even look at the IDE wrong, but I digress). In any event, my stored procedure doing the update returns a fresh set of data after said update. Okay, playing around with this a bit, I find that using the UpdatedRowSource set to FirstReturnedRecord prevents concurrency errors when editing twice in the same row, but of course, we would now have a concurrency error with the expression column. So what gives? Is there a reasonable solution? Tag: Deleting rows in dataset Tag: 122689

How can i delete a row in dataset based on the column value, i have four
columns in a row and i want to delete the row based on the column1 value.

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Re: Deleting rows in dataset by Miha

Miha
Tue Jan 03 14:16:07 CST 2006

Hi,

Select the rows you wish to delete (perhaps using DataTable.Select method or
dataview) and do an inverse for loop (from latest row to first row) - inside
the loop call DataRow.Delete method.
And, of course, call DataAdapter.Update to persist the changes in database
if you wish.

--
Miha Markic [MVP C#]
RightHand .NET consulting & development www.rthand.com
Blog: http://cs.rthand.com/blogs/blog_with_righthand/

"dotnetlover" <dotnetlover@discussions.microsoft.com> wrote in message
news:5B8E459B-11EF-4250-930B-89A3A8A21468@microsoft.com...
> How can i delete a row in dataset based on the column value, i have four
> columns in a row and i want to delete the row based on the column1 value.

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