DataTable Edit Rows

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  - 1
    - Writing a Memo field to an Access DB with OleDB Hello, I have big problem on updating an Access Memo field with OleDb. While the InsertCommand works, then UpdateCommand raises an exception: Syntaxerror in UPDATE-Statement. I tryed various work arounds (the last 3 days) with and without the CommandBuilder with allways the same result. The last attempt was: Public Function WriteMemoToAccess(ByVal Pars As String) As Boolean 'Parameters is the ColumnName of the Access Memo field Dim AccessCommand As New OleDb.OleDbCommand("UPDATE DocH SET Parameters=? WHERE IdNum = 1") Dim QueryParameter As New OleDb.OleDbParameter("@Parameters", _ OleDb.OleDbType.LongVarWChar, Len(Pars), ParameterDirection.Input, True, _ Nothing, Nothing, Nothing, DataRowVersion.Current, Pars) AccessCommand.Parameters.Add(QueryParameter) AccessCommand.Connection = Me.Connection Me.Connection.Open() Try AccessCommand.ExecuteNonQuery() WriteMemoToAccess = True Catch ex As Exception End Try Me.Connection.Close() End Function Is there a way to do this?? Best regards Alfred Malleier (South Tyrol) Tag: DataTable Edit Rows Tag: 132118
  - 2
    - Why Must I Have "SET DATEFORMAT dmy" in Stored Proc? I'm calling a stored proc from C# and the call includes a datetime. The exe can run on machine A or B but the database is on machine C. When I run on machine A I need SET DATEFORMAT dmy in the proc or I get an 'out-of-range datetime value' message. I need to comment this statement out when the call is made from machine B. It seems as though I have a UK locale on machine A and a US locale on machine B and the swapping of days and months causes the error. Is this locale setting per machine possible? If so then how to change it? TIA, jeb. Tag: DataTable Edit Rows Tag: 132116
  - 3
    - saving datatable as new table in database i am creating a Datatable in memory and would like to save the DataTable as a new table in the database when i am done. How can I do this? thanks m Tag: DataTable Edit Rows Tag: 132112
  - 4
    - dataset safety? Hi, I am currently looking at re-writing a payroll/timesheet application that is currently in Access. The users need to enter timesheet hours for numerous employees. Up till now I have been experimenting and using strongly typed datasets as generated by VS. However as these provide a disconnected model, how can I prevent the loss of user data if the user PC crashes or dies for whatever reason. I imagine it would be inefficient to be performing writes to the database using datasets after every record is inserted. I like the binding and coding efficiency of using strongly typed datasets, however it would seem like there can be big overheads and risk in not updating to the database regularly. Can anyone recommend a better way? thanks Tag: DataTable Edit Rows Tag: 132107
  - 5
    - OCI.DLL: The specified module could not be found + OCIEnvCreate fa In VS2005 (Version 8.0.50727.42), I'm trying to create a "Data Connection" in the "Server Explorer" window ... I right click on "Data Connections" ... and choose "Add Connection" ... In that window, I change the "Data Source" to "Oracle Database" ... Then for "Server Name" I enter "newbisd.world", which corresponds to an entry in my TNSnames.ora file ... and I type in my Username and Password ... Then, when I hit either "OK" or "Test Connection", I get an error box titled "OCI.DLL" that says "The specified module could not be found" ... and after I click "OK" to that, another one comes up saying "OCIEnvCreate failed with return code -1 but error message text was not available." Where do I start? Thanks for any tips / pointers ... other info ... - I'm running Windows 2000 5.00.2195 (SP4) - I'm running Oracle 9.2 ... have upgraded to this - I can connect to the database with Oracle SQL*Plus ... and TOAD - I've read Paul Clement's reply to MikeB from 7/22/2005 and gave Authenticated User privelege to the ORACLE_HOME ... - According to my registry (when viewd by Regedit), in the HKEY_LOCAL_MACHINE folder + SOFTWARE folder + ORACLE folder, the variable ORACLE_HOME = C:\oracle\ora92 (... and I have a similar entry in a subfolder called HOME0) ... and in this folder's "bin" directory, I've got a file named "oci.dll" that's 112KB dated 05/01/2002 8:40pm Tag: DataTable Edit Rows Tag: 132103
  - 6
    - Oracle 10g Float and Double Database Datatypes are not supported Greetings, I have data values that are inherently of type Double. Current we are using Oracle Column Datatype NUMBER. When I create a TableAdapter in VS2005, the database table column information is read from Oracle and a new Table is created. However, the detected datatypes are always Decimal. Even if I change the datatype in the Database to a lower precision that would not exceed the precision of a Double, it is always detected as a Decimal. This forces me to cast everywhere, making the strongly-typed dataset, not as useful. Option 1: Now you might wonder, why not just change the datatype after the table is created. This does in fact work, but if you alter the Select statement later, the table is regenerated and since the datatypes no longer match what was found in the database, new columns are added with a "1" appended to the column name, which wrecks everything. So, I have to delete all the columns first, then make my SQL change, then go back and change all the datatypes back to what I need them to be. This sucks. Option 2: Use the new Oracle 10g BINARY_DOUBLE column datatype. This would be the preferred solution, but Microsoft apparently does not support it. Even though this may be perfectly matched with the precision of a System.Double. Option 3: Microsoft should detect the Precision and Scale of the NUMBER datatype in Oracle and use the appropriate .NET datatype instead of always using Decimal. I believe this is done is other MS products via ODBC, but not here... Question: Is there ANY numeric datatype I can use in Oracle that will be detected by the the MS Oracle Data Provider as a System.Double in the Strongly-Typed representation? I fear this answer is no. If it is, Microsoft should provide a hotfix to allow Option 2 or Option 3 to work. Without one of these solutions, maintenance will be a big pain. Other developers on my team, should be able to go into the Query Builder, check off a new column for the Select statement, and this should just add the new column, but this doesn't work. It makes a mess, and can go almost unnoticed until you build and a list of cast exceptions appears... Hence the big pain. -Valkyrie-MT Tag: DataTable Edit Rows Tag: 132102
  - 7
    - multi threaded database access with transactions I have a program that runs on multiple threads working with database sproc calls... these need to be all ran in transactions.... how can I get something similar to parallel transactions or at least to the point where they dont cause each other to crash? They all work with the same database connection...thanks! Tag: DataTable Edit Rows Tag: 132099
  - 8
    - MySQL database connection Hi, All This is the first time that I code asp.net against mySQL database. I am confused that which connector should I use 'cause I do not want make the wrong choice and have some problems later on? one is from mySQL official website http://www.mysql.com/products/connector/net/ or ODBC/OleDB driver come with MS .Net? Any experience can share with? Thanks a lot -rockdale Tag: DataTable Edit Rows Tag: 132093
  - 9
    - Global Cancel I want to create a single Cancel method to cancel all changes made to any fields in a UserControl. I have a method that creates a Binding object, adds it to a collection and than adds the Binding to the control. textBox1.DataBindings.Add(CreateDataBinding("Text", myobject, "Caption") ); public void Cancel() { foreach (Binding b in this.Bindings) b.BindingManagerBase.CancelCurrentEdit(); // This never changes the value back } Is there anyway to create something like I want? Thanks, Joe Tag: DataTable Edit Rows Tag: 132089
  - 10
    - Retrieving database schema Hi Everyone: Iâ??m new to the VB.NET development platform, and Iâ??m trying to understand how to retrieve database schema information from either of these databases: Microsoft Access, Microsoft SQL Server 2000, or Oracle. I recently bought a reference book titled â??Beginning VB.NET Databasesâ?? by Thearon Willis from WROX press. From this book I have found a way to dynamically connect to any database and check to see if the connection was successful. What I would like to do is once the connection to the database is established, show a list of the tables contained in the selected database. If the user needs to add data to a specific table he would select the table he needs to add the data too and the application would create a datasheet with the columns (Fields) of the database shown in the order they where created in the table. I would also like to label the primary key of the table and any foreign keys that table references. Iâ??m having difficulty in finding examples of these types of operations. Can anyone show me where to go to find this information. Thank you, -- Mark Tag: DataTable Edit Rows Tag: 132088
  - 11
    - Count rows in dataset WHERE ... Hi, I am attempting to do a number of count functions on a single table of data for presentation in an ASP webpage. The functions are number today, number this week, number this month etc. As the Database table is large it does not make sense to query it directly a number of times. My idea is to create a dataset containing the table "ApplicationForms". I then want to query this and perform the various count functions. If I were querying the database the query would be: SELECT COUNT(DISTINCT fkiBatchNumber) AS 'YearCount' FROM tblApplicationForms WHERE (dtDateScanned < dtYear) dtToday is a datetime predefined in C# code. I have no idea how to query the dataset in an equivilent manner. Is this the most suitable method of acheiving my requirement? If so, any help in doing so is much appreciated. Thanks. Tag: DataTable Edit Rows Tag: 132081
  - 12
    - Oracle TransactionScope Rollback issue I am having problems re-openning closed Oracle connections (System.Data.OracleClient.OracleConnection) when using TransactionScope and using the Rollback feature (i.e. not calling Complete on TransactionScope). I create a simple for loop with a TransactionScope statement inside. All that happens inside the TransactionScope section is an open and close of an OracleConnection object, and no call to Complete on the TransactionScope object (Rollback). The second iteration or the loop will hang when calling Open on the OracleConnection object. If you include the Complete call on the TransactionScope, it will work fine. If you exclude TransactionScope, it will work fine. If you step through the code, it will work fine. If you put a System.Threading.Thread.Sleep(50) statement at the beginning of the loop, it will work fine. I thought it might be a disposing/garbage collection issue, so I tried putting GC.Collect at the start of the loop, but that didn't work. If I use Oracle's provider, it will work fine (Oracle.DataAccess.Client). If you leave the connection open when iterating through the loop, it appears to work fine. I have the 9.2.00.54 Oracle client installed. I have some sample code listed below. We would really like to use the System.Data.OracleClient as opposed to the Oracle.DataAccess.Client. So, any suggestions would be greatly appreciated. Thanks. using System; using System.Collections.Generic; using System.Text; using System.Transactions; using System.Data.OracleClient; //using Oracle.DataAccess.Client; using System.Data; namespace ConsoleApplication2 { class Program { const string DATASOURCE = "Data Source=test_db;User Id=sam;Password=sam;"; static OracleConnection cn; static int i; static void Main(string[] args) { cn = new OracleConnection(DATASOURCE); for (i = 0; i < 100; i++) { TransactionScopeTest(); //TransactionScopeCompleteTest(); //TransactionScopeTestWithSleep(); //ConnectionTest(); } Console.ReadLine(); } static void TransactionScopeTest() { using (TransactionScope ts = new TransactionScope()) { OpenClose(); } } static void TransactionScopeCompleteTest() { using (TransactionScope ts = new TransactionScope()) { OpenClose(); ts.Complete(); } } static void ConnectionTest() { OpenClose(); } static void TransactionScopeTestWithSleep() { using (TransactionScope ts = new TransactionScope()) { System.Threading.Thread.Sleep(50); OpenClose(); } } static void OpenClose() { if (cn.State != ConnectionState.Open) { Console.WriteLine("ConnectionState: " + cn.State.ToString() + "; openning " + i.ToString()); cn.Open(); Console.WriteLine("ConnectionState: " + cn.State.ToString() + "; openned " + i.ToString()); } if (cn.State != ConnectionState.Closed) { Console.WriteLine("ConnectionState is " + cn.State.ToString() + "; closing " + i.ToString()); cn.Close(); } Console.WriteLine("ConnectionState is " + cn.State.ToString() + " " + i.ToString()); } } } Tag: DataTable Edit Rows Tag: 132078
  - 13
    - dataset - Insert-query with stored procedure using wizard Hi all, I don't know where to publish this question but hope this newsgroup is okey. I'm working in Visual Studio 2005 and are now creating a dataset file where I will do all the transactions with the database. I have a consumer table where I want to insert, update and delete consumers. In the database I use uniqueidentifier on the primary key and said that it is a rowGuid - (newid()). When I try to generate a stored procedure to insert new consumers I have to insert without adding the primary key because it is automatically generated on a new insertion. However when using the wizard to generate the stored procedure the wizard fails when I remove the primary key. After the insert query the wizard created a select query with a where - clause like the primary key variable. (uidConsumerID = @uidConsumerID). Here I changed to SCOPE_IDENTITY( ) instead to get the databaserow from the current scope. But this fails. So what's wrong? What is the best way to make an insertion to a row using RowGuid on the primary key? Until further I will try to create the sp manually in the database and force dotnet to use my own stored procedure. In advance thanks a lot for your help! Kind regards, Jon Haakon Tag: DataTable Edit Rows Tag: 132069
  - 14
    - Newbie needs help Hi everyone, I'd like to access a database using C#. I've installed the Visual Studio 2003 and mysql essential and mysql administrator. On Visual Studio I go on server view and right click on SQL Servers, then I click on Register SQL Server Instance. It will prompt me to enter the instance name and login information but I'm getting this error - [DBNETLIB][ConnectionOpen(Connect()).]SQL Server does not exist or access denied. I'm sure that my username and password are correct. The only thing I'm not sure of is the instance name? Is the instance name the same as service name - such as MySQL in Services? Any help? Thanks, Clayton Tag: DataTable Edit Rows Tag: 132068
  - 15
    - Keyword similar to App(VB6.0) in VB.NET Hello all, Can anyone here suggest me the keyword App similar to that in VB.NET? Iam developing a application which uses MS-Access as the database. In vb6.0 I use App to find the path and connect to the database example: dbname = App.Path & "\XXXXXX.mdb" Could anyone here please suggest me a way similar to that of App I know how to connect to database. example dbname = "C:\Temp\xxxxx.mdb" con.Open("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & dbname & ";Persist Security Info=False") Thanks in advance Jack Tag: DataTable Edit Rows Tag: 132065
  - 16
    - OleDb vs. Sql Interoperability I'm building a lot of ASPX pages and business objects that consume and interact with database data. Some of this is done with data-binding, some is done with programmatic calls to Stored Procedures, Views, etc. I've created a DB class that I use to simplify and make consistent my inteaction with the database, and for all of the aspects of connecting to the database, building the call (query, Stored Procedure, Stored Procedure with Parameters, etc.) that works just fine. But here's my problem: Data that is returned comes back in objects like XXDataReader (OleDbDataReader or SqlDataReader). If I use one of these in my .aspx Pages, it means I've committed to using either OleDb for my database access of SqlClient for my database access. What if I don't want to have to decide? What if I want to set things up so that, if I want to switch from a SqlServer to some other database backend, I can just change my DB class, but not have to touch all of my pages and other objects? What's the most elegant and prefered way to do this? I know that I *could* just use OleDb for everything (including SqlServer), but that seems like such a shame in that I understand that the SqlClient access for SqlServer is supposed to be *way* more efficient. Alex Tag: DataTable Edit Rows Tag: 132054
  - 17
    - Strange error message I am inserting a new record into a table which has 4 columns, the first being an identity column. I am adding three strings to the other 3 columns using an ExecuteNonQuery. I have set the values of the parameters for the InsertCommand. The error I am getting is that the Input is not in the correct format for SqlCommand.ExecuteReader(CommandBehaviour cmdBehaviour, RunBehaviour runBehavious, Boolean returnStream) My SelectCommand insert the three values and returns all 4, including the Identity column. My command is: this.sqlInsertCommand1.CommandText = "INSERT INTO Customers(CustName, CustAddress, CustPhone) VALUES (@CustName, @CustAddress, @CustPhone); SELECT CustID, CustName, CustAddress, CustPhone FROM Customers WHERE (CustID = @@IDENTITY)"; The only parameter I had to create was the @CustID parameter and it is the same type and size as the CustID column in the table I created. Can anyone suggest why I am getting this error? Tag: DataTable Edit Rows Tag: 132053
  - 18
    - Insert Date into SQL c# - Correct Format Hallo guys, I am getting bonkers (sorry). i have sql2005express/c#. I have calender and i get the dates right DateTime DeployDate = Convert.ToDateTime(Calendar1.SelectedDate); i tried putting the deployed date as a string and having Calendar1.SelectedDate.Convert.ToString as well after this i have a insert string which is giving me all i need..... String getSYS4Table = "SELECT DISTINCT gdsSITE.SiteID, gdsSITE.SitePriority, gdsSITE.SiteGroup AS SITEGROUPS, gdsSITE.TimeID, gdsSITE.ZoneID, gdsSITE.Hours, gdsSITE.SystemID, gdsAssignedGuardSYS4.ForceNumber, gdsAssignedGuardSYS4.Nationality, gdsAssignedGuardSYS4.PriorityID, gdsAssignedGuardSYS4.FullName, gdsAssignedGuardSYS4.SiteGroup FROM gdsSITE INNER JOIN gdsAssignedGuardSYS4 ON gdsSITE.SiteGroup = gdsAssignedGuardSYS4.SiteGroup"; all is fine! thats right. mys string works though until the dates is 12. because in mys sql serever i can seach and get dates. WHERE DeployDate='19/08/2006' it refuses so i need to change the date to be yyyyMMdd but i have been looking and trying and failing on this part. i need to enter the DeployDate as yyyyMMdd only that. can someone help me before the doctors come and collect because iam going nuts. thanks in advance Tag: DataTable Edit Rows Tag: 132051
  - 19
    - Databinding a check list box Hi I have a check box list box on a windows form. How can I data bind it to an access table. I don't need a multi-tier solution. Just a solution. Thanks Regards Tag: DataTable Edit Rows Tag: 132045
  - 20
    - Need some help on forms Hey, YO...., I NEED SOME HELP HERE ! Actually, I got some info from a good guy called ScottT, but I need more. You see, I'm kind of stuck in here. I need to connect two forms. But the problem is... I don't know the codes. What I wanna do is click a button from the first form to go to the second form & then click a button from the second form to go to the third form & then etc etc. Also I wanna have a certain form which connected to all the other forms & can click a button from that certain form to go to all the other forms. That's all. Why can't anybody just help me ? I'm a newcomer to the field & I need help so ...so ...much. Tag: DataTable Edit Rows Tag: 132040
  - 21
    - StoredProc commits results in QueryAnalyzer but not in ADO.NET I'm hoping someone can help! I have a stored procedure in an MSDE database. When I use Query Analyser to run this stored procedure the correct results appear in the database. My stored procedure returns resultCode. The stored procedure includes a single BEGIN TRANSACTION [...] COMMIT TRANSACTION Within my application, I execute the follow code I recieve the correct result code but the information is NOT updated in teh database. I have tried with and without ADO transactions. public int CreateFrame(string BRKEY, string INSPKEY, string USERKEY) { //System.Data.OleDb.OleDbTransaction frameTransaction; int returnValue = 0; _command.Parameters["@brkey"].Value = BRKEY; _command.Parameters["@userkey"].Value = USERKEY; _command.Parameters["@inspkey"].Value = INSPKEY; try { if (_command.Connection.State == System.Data.ConnectionState.Closed) _command.Connection.Open(); } catch (Exception ex) { System.Diagnostics.Trace.WriteLine(ex.Message); returnValue=-99; } if (returnValue !=0) return(returnValue); //frameTransaction = _command.Connection.BeginTransaction(); //_command.Transaction = frameTransaction; try { _reader =_command.ExecuteReader(); _reader.Close(); returnValue = (int)_command.Parameters["@returnCode"].Value; //frameTransaction.Commit(); _command.Connection.Close(); _command.Dispose(); } catch (Exception exception) { //frameTransaction.Rollback(); System.Diagnostics.Trace.WriteLine(exception.Message); returnValue=-99; } finally { if (_command != null) _command.Dispose(); } return(returnValue); } my parameters and my command and connection objects are created in the initializer to my class My users begin testing in 2 days and I'd like to have this functionality working. HELP! 8-) Tag: DataTable Edit Rows Tag: 132039
  - 22
    - CSV header conating "." dot and after loading it into dataset its converting into "#" CSV header conating "." dot and after loading it into dataset its converting into "#" LIKE. First.Name First # Name waiting for your reply Tag: DataTable Edit Rows Tag: 132037
  - 23
    - How to know the first sheet name of an Excel I use the codes below to import the first sheet of an Excel file into a DataSet. But if the name of the first sheet is not "Sheet1", the SelectCommand will fail. How can I know the sheet name of the first Sheet in an Excel file? string sConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + savePath + "; Extended Properties=" + (char)34 + "Excel 8.0;IMEX=1;" + (char)34; string sSelect = "SELECT * FROM [Sheet1$]"; OleDbConnection objConn = new OleDbConnection(sConnectionString); objConn.Open(); OleDbCommand objCmdSelect = new OleDbCommand(sSelect, objConn); OleDbDataAdapter objAdapter1 = new OleDbDataAdapter(); objAdapter1.SelectCommand = objCmdSelect; objAdapter1.Fill(ds, "XLData"); objConn.Close(); Tag: DataTable Edit Rows Tag: 132034
  - 24
    - How to determinate if a string in the Field names of a dataTable? Hi, I have a dataTable with some fields. How can I determinate if a string in the Field names of a dataTable? Tag: DataTable Edit Rows Tag: 132032
  - 25
    - Using Oracle.ClientAccess.Data with System.Data.Common I am trying to return a datatable using the Oracle driver. In order to return a dataset from the stored proc I need a cursor type to receive the data. How is this possible with the Common namespace since it does not have a cursor or refcursor type? John Tag: DataTable Edit Rows Tag: 132029
- Next
  - 1
    - Trying to restore a .bak in C# Can I run a SQL command like: RESTORE DATABASE NewDB FROM DISK = 'ApplicationStartupPath\SQLSE2005\DevDB.bak' WITH RECOVERY, MOVE 'DevDB_Data' TO 'C:\\Program Files\\Microsoft SQL Server\\MSSQL.1\\MSSQL\\Data\\NewEB_Data.mdf', MOVE 'DevDB_Log' TO 'C:\\Program Files\\Microsoft SQL Server\\MSSQL.1\\MSSQL\\Data\\NewDB_Log.ldf' while connected to the master db installed by default in SQLSE 2005? If not how the heck do I run this command to restore this db for the client when they install the app? Tag: DataTable Edit Rows Tag: 132024
  - 2
    - SqlTypes Decimal Hi, I'm using .Net Framework 2.0. I Querying an Sql 2000 Database to fill a Dataset, the user dynamically choses what tables to query to fill the dataset. I need to provide information to the user about the tables, information such as the type and size of the columns. Though at start this seemed to be quite simple to do, I have now came to a problem when working with decimal columns. how can I get the number of digits that a decimal column suports? I have tried using sqlTypes when filling the table but not have been able to get this info. Can SomeBody Help me Please. Carlos Pedro Tag: DataTable Edit Rows Tag: 132022
  - 3
    - Stored Proc problem Hi, I am having stored proc which returns 2 resultsets, now i want to call this stored proc within another stored proc, but i want to use only the second resultset from the previous stored proc. So please tell me how can i do this.?? Thanks in advance, Regards, Manoj Singh. Tag: DataTable Edit Rows Tag: 132018
  - 4
    - SqlCommandBuilder - not setting my identity column I ran into a problem when I tried to use SqlCommandBuilder to generate my insert statement. The problem was the identity column wasn't being set when I called Update. It was set correctly in the database, it just wasn't updating my inserted DataRow. This caused issues when I went to add rows in other tables that keyed off the one I just inserted because I didn't have the primary key. Long story short... I searched high and low and was finally able to piece it together between what I found in these newsgroups and the MSDN documentation. I thought I'd share how simple it ended up being because I saw some crazy work-arounds in all my searching. There were two key things that I kept missing somehow. 1. calling RefeshSchema to clear the command builders handy work and then resetting the insert command with my mods to the originally generated one. 2. setting UpdatedRowSource to FirstReturnedRecord. It ended up being so simple... sheesh! The hours I spent searching. I hope someone else gets some value out of this. Rob // Set up _tblMain = new DataTable(TBL_PENDING_MAIN); _cmdBuilderMain = new SqlCommandBuilder( new SqlDataAdapter("SELECT * FROM " + TBL_PENDING_MAIN, _conn)); _cmdBuilderMain.DataAdapter.FillSchema(_tblMain, SchemaType.Mapped); // Later after adding a row to the table... // take care of the pesky bug in the command builder // (doesn't get the identity colomn) SqlCommand cmd = _cmdBuilderMain.GetInsertCommand(true); _cmdBuilderMain.RefreshSchema(); // Clears the generated commands cmd.CommandText += "; SELECT SCOPE_IDENTITY() AS PIF_ID;"; cmd.UpdatedRowSource = UpdateRowSource.FirstReturnedRecord; _cmdBuilderMain.DataAdapter.InsertCommand = cmd; _cmdBuilderMain.DataAdapter.Update(_tblMain); // now _tblMain.Rows[0]["PIF_ID"] is correctly set!! Tag: DataTable Edit Rows Tag: 132014
  - 5
    - database writing efficiency I need to log 400 values every second into an access database. Previously I did this in C++ using OLEDB and after a lot of experimentation, I minimized the peak CPU usage by writing out the data in a separate thread every 10ms. Now I have to do this in C# and I am uncertain as to the most efficient method (I am primarily concerned with CPU usage). My current methodology is below. One inefficiency I recognize but Iâ??m not sure how to fix is that Iâ??m storing the data in memory as well as the database but I only really need it in the database. Another specific question I have is which database adaptor is fastest with access and which update override is fastest (maybe rows is better than tables?) Thanks, Jeff { string strSQL; OleDbCommandBuilder cmdBuilder; DataSet dsIOChannelData; m_dbConnection = new OleDbConnection(strConnection); strSQL = "SELECT TimeStamp, ChannelID, Value FROM tblIOChannelData"; daIOChannelData = new OleDbDataAdapter(strSQL, m_dbConnection); cmdBuilder = new OleDbCommandBuilder(daIOChannelData); cmdBuilder.QuotePrefix = "["; cmdBuilder.QuoteSuffix = "]"; cmdBuilder.SetAllValues = true; dsIOChannelData = new DataSet(); m_dbConnection.Open(); daIOChannelData.Fill(dsIOChannelData, "tblIOChannelData"); dtIOChannelData = dsIOChannelData.Tables[0]; } public void LogIO() { long lStartTicks; long lElapsedTicks; double dInverseTicksPerMS; OleDbDataAdapter dbAdaptor; DataTable dtIOChannelData; loadIOLogDataTable(out dbAdaptor, out dtIOChannelData); dInverseTicksPerMS = 1.0 / TimeSpan.TicksPerMillisecond; m_bActiveLog = true; while (m_bActiveLog) { lStartTicks = DateTime.Now.Ticks; for (int i = 0; i != 400; ++i) dtIOChannelData.Rows.Add(DateTime.Now.ToOADate(), 77.5, 5); dbAdaptor.Update(dtIOChannelData); lElapsedTicks = DateTime.Now.Ticks - lStartTicks; Thread.Sleep(Math.Max(0, 1000 - (int)(lElapsedTicks * dInverseTicksPerMS + 0.5))); } m_dbConnection.Close(); } Tag: DataTable Edit Rows Tag: 132010
  - 6
    - Datatable size in memory Does anyone know of a way to estimate how much memory a datatable is using? Are they any user-friendly tools that I can find this info out? Thanks Tag: DataTable Edit Rows Tag: 132004
  - 7
    - ADO.NET 2.0 - Simple question for you... I have an ASP.NET 2.0 website. I want to write a function in ADO.NET 2.0 (VB.NET) that does the following: 1. Opens up a connection to my SqlExpress db. (The connectionstring is in the <connectionStrings> section of my web.config) 2. Runs a query, storing results in a datatable. 3. Closes connection Can anyone assist? Thanks! Tag: DataTable Edit Rows Tag: 132002
  - 8
    - MS Access modules Hullo all: Is there a nifty way to retrieve a list of the macros / code modules in an MS Access database using ADO.NET, a la OleDB.OleDBConnection.GetOleDbSchemaTable for retrieving tables and views? Thanks much, zdrakec Tag: DataTable Edit Rows Tag: 132001
  - 9
    - Simple SQL INSERT I have a SQL INSERT statement. I'm pretty well-versed in SQL but NOT in VB.NET / ASP.NET. I would like to know what VB code is for inserting a new row into a database. I have a SQL Table established already. I would like to know the code required to insert a new row to that SQL Table. I don't have any connection strings established yet, I don't have anything. Can you please take pity on a poor .NET Newb and tell me what I should be doing? I've tried several examples and have yet to successfully insert a record. I think I need to know how to establish the connection, and then write (insert) a new record to that connection. Thanks in advance. This stuff can be very overwhelming. Tag: DataTable Edit Rows Tag: 131988
  - 10
    - Simple SQL INSERT I have a SQL INSERT statement. I'm pretty well-versed in SQL but NOT in VB.NET / ASP.NET. I would like to know what VB code is for inserting a new row into a database. I have a SQL Table established already. I would like to know the code required to insert a new row to that SQL Table. I don't have any connection strings established yet, I don't have anything. Can you please take pity on a poor .NET Newb and tell me what I should be doing? I've tried several examples and have yet to successfully insert a record. I think I need to know how to establish the connection, and then write (insert) a new record to that connection. Thanks in advance. This stuff can be very overwhelming. Tag: DataTable Edit Rows Tag: 131987
  - 11
    - DataGridViewComboBoxColumn seperate items I'd like to have separate items in the DataGridViewComboBoxColumn for each row, For an example look at the vs2005 query builder. Column(0) is the fieldName and contains a list of the fields from the table named in column(2). If the table selected in column(2) of a particular row is changed the available items in column(0) reflect the available fields for that table. And if there isnâ??t a table selected in column(2) then the items available in column(0) is the full field list for all table. How would I do something similar (really really similar)? Tag: DataTable Edit Rows Tag: 131986
  - 12
    - downloading of a file from internet explorer Hi, Generally we will download the files using internet exlorer defalut download manager.By using C# or VB.Net how will we get the file information which we are trying to download from the Internet explorer. Is it possible. If any one helps thanks in advance. if any one have Code it will be very helpful. Regards, kamal. Tag: DataTable Edit Rows Tag: 131985
  - 13
    - DataRelation problem Hi, I want to use DataRelation object for setting up relationship between two different datatable, but i want to use multiple columns to set up relation between two tables. For example. DataRelation dRelationOrgInd = new DataRelation("OrgInd", ds.Tables["OrgList"].Columns["iIDOrganization, iIDSeries"], ds.Tables["IndList"].Columns["iIDOrganization, iIDSeries"], true); dRelationOrgInd.Nested = true; ds.Relations.Add(dRelationOrgInd); I want to use something above mention code, but i am not able to set up multiple columns in datarelation object for single table. ...I am using C# 2.0 Please tell me how can i achieve the same. Thanks in advance. Regards, Manoj Singh. Tag: DataTable Edit Rows Tag: 131984
  - 14
    - Problem with a readonly table in a dataset (data source) in VS 200 I created a data source that point to an Access database with 3 tables in it. My problem is that the tables are designated read only and I don't know how to change the setting so I can copy data to them. I can see the public property in the config file but I am new to Visual Studio 2005 and don't know how to fix my problem. -- cathy Tag: DataTable Edit Rows Tag: 131980
  - 15
    - DataSet designer in VS2005 Hi, I have two questions about the DataSet designer in Visual Studio 2005: 1. How can I make another TableAdapter under a DataTable which already has one? I'm sharing the DataSet with the DataTable between two applications, and they need separate TableAdapters... 2. I've created the DataTable with structure identical to the SQL Server table it is based on - can I easily update (not automatically, but from the designer) the DataTable to make the DataTable structure match the SQL Server table? (i.e. when a column is added or modified in the SQL Server table, I want to click a button in VS2005 so the same modification is done in the DataTable). Thanks! Regards, Nils Magnus Englund Tag: DataTable Edit Rows Tag: 131974
  - 16
    - Newbie and 2005 Concurrecny Hi All, Hope you all fine? Can I ask you all a quick question? I`ve been trying to get concurrency to work for my project in VB2005. I have the following code, which to be fair i`ve got so lost with but here it is: Private Sub BTADSL_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load Me.MasterDBDataSet.EnforceConstraints = False Me.M_BTAnalogueLinesTableAdapter.Fill(Me.MasterDBDataSet.M_BTAnalogueLines) Me.S_LocationsTableAdapter.Fill(Me.MasterDBDataSet.S_Locations) Me.M_BTADSLTableAdapter.Fill(Me.MasterDBDataSet.M_BTADSL) 'USERS M_BTADSLDataGridView.DataSource = MasterDBDataSet.M_BTADSL BTAnalougeLinesIDcomboBox.DataBindings.Add("TEXT", MasterDBDataSet.M_BTADSL.BTAnalougeLinesIDColumn, "TelephoneNumber") BTAnalougeLinesIDcomboBox.DataSource = MasterDBDataSet.M_BTADSL BTAnalougeLinesIDcomboBox.DisplayMember = "M_BTADSL.S_Locations.TelephoneNumber" BTAnalougeLinesIDcomboBox.ValueMember = "M_BTADSL.BTAnalougeLinesID" LocationsIDcomboBox.DataBindings.Add("TEXT", MasterDBDataSet.M_BTADSL.LocationsIDColumn, "Location") Dim cmBTADSL As CurrencyManager cmBTADSL = Me.BindingContext(MasterDBDataSet, "BTADSL") cmBTADSL = DirectCast(BindingContext(MasterDBDataSet.M_BTADSL), CurrencyManager) 'USER Im so confused with the concurrency thing i just don`t know where to go now. Could anybody have a look and tell me what a mess i`ve made and how to solve it? If poss maybe some links? Many Thanks A very Comfused Newbie Tag: DataTable Edit Rows Tag: 131971
  - 17
    - SQL UPDATE for Dates ?? Hi folks, I have 2 code snippets. One works and one does not. This first hard-coded snippet works Dim queryString As String = "UPDATE [rfi] SET [dateresolved] = '8/16/2006' WHERE ([rfi].[id] = @id)" This second snippet does not work Dim dtNow As DateTime = DateTime.Now dRes = dtNow.ToShortDateString Dim queryString As String = "UPDATE [rfi] SET [dateresolved] = dRes WHERE ([rfi].[id] = @id)" dateresolved is a Date/Time data-type. The first snippet uses single quotes around the date but I would think the second snippet would be accepted as a string. If I debug the value of dRes, I receive the proper format of "8/16/2006" Any clues you can leave me with? Thanks, - Glenn Tag: DataTable Edit Rows Tag: 131968
  - 18
    - Auto uncrement column Im am trying to create an auto increment column in a table. Where in the code below, should I make which changes in order to do that? Adrian /* dt.Columns.Add("Key", System.Type.GetType("System.Int32")); dt.Columns["Key"].AutoIncrement = true; dt.Columns["Key"].AutoIncrementSeed = 1; dt.Columns["Key"].AutoIncrementStep = 1; dt.PrimaryKey = new DataColumn[] { dt.Columns["Key"]}; */ DataColumn auto = dt.Columns.Add("Key", typeof(int)); dt.Columns["Key"].AutoIncrement = true; dt.Columns["Key"].AutoIncrementSeed = 1; dt.Columns["Key"].AutoIncrementStep = 1; //auto.AutoIncrement = true; //auto.AutoIncrementSeed = 0; //auto.AutoIncrementStep = 15; dt.PrimaryKey = new DataColumn[] {auto}; dt.Columns.Add("ForeName", System.Type.GetType("System.String")); dt.Columns.Add("LastName", System.Type.GetType("System.String")); dt.Columns.Add("TelephoneNumber", System.Type.GetType("System.String")); Tag: DataTable Edit Rows Tag: 131966
  - 19
    - DataSet Designer/adding multiple tables to a dataset/ how? In the VS2005 DataSet Designer if i try to add multiple tables from an OLEDB database, i get an error: "Failed to add TableAdapter." "An item with the same key has already been added." What does this mean? How do i get around it? Tag: DataTable Edit Rows Tag: 131963
  - 20
    - Changing ConnectionString programmatically Have the following situation: I have an old C++ application, which I have managed to compile with /clr to make it access .net functionality. For some of the new functionality I have decided to create a C# DLL, being a very neat and handy language. I have used wizards to create the dataset, extracting data to a grid from an SQLServer with stored procedures, all generated from wizards and life is fine. Except: The connection string that I have is of course "hard coded default", so that I could get the data in in the first place. The real life connection string that I want is something that I have read from another database in the main application (C++), which I now would like the C# DLL to use as well. This connection string also contains username and password set from a user login (using SQLServer authorisation). The C++ application, originally being unmanaged does not read an app.config file. The connection string is therefore not accessible through System.Configuration.Configuration. And the MyDLL.Properties.Settings.Default.myConnectionString is readonly, and might not change things anyway. Anyone, please? Or do I have to rewrite the whole db code? Ole Tag: DataTable Edit Rows Tag: 131958
  - 21
    - what ado.net object to use problem I need to accomplish this tasks: 1. i need to query sql database 2. check if null, if not continue 3. check a certain column if null,if not continue 4. filter or split the data into two sets, these 2 will be the datasources of two gridview. i can use datareader to query sql database, check if its null (using datareader.hasrows), and check if certain column if null; however i cant use datareader to filter rows into 2 sets. To achieve this, datatable has select method or dataview has rowfilter method. Now how do i transfer data from datareader to datatable or dataset/dataview? As much as possible i want a single database query so the web app will be faster. Thanks. Tag: DataTable Edit Rows Tag: 131957
  - 22
    - Add money to your Paypal account with OPRAH r(;x3 Read this message until the end, and you will find out how the money flows in easy !!!!. Follow the steps and it WILL work. Trust me !!!!!. It's NOT illegal and it is NOT a scam !!!!!. PROVEN ON OPRAH! Reported in the Wall Street Journal!!!! The only thing you need is : - E-MAIL ACCOUNT - PREMIER (FREE) or BUSINESS PAYPAL ACCOUNT - $6 on this account (The only investment) - 30 minutes of your time There is no limit on how much money you can recieve, and you haven't got anything to lose with this Business program. I will explain how it works !!!!!. Follow these 4 easy steps and it WILL work !!!!!. STEP 1 : SIGN UP FOR A FREE PAYPAL ACCOUNT !!!!!. Paypal is a free and safe way to pay and receive money on the Internet. Creating a account is as easy as creating a MSN account. Copy and paste the next line in your Internet browser and sign up. HTTP://WWW.PAYPAL.COM Be sure to sign up for a FREE Premier or Business account and not for a Personal account. You cannot receive CREDITCARD payments with a Personal account and we can't have that. Do we !!!!!. STEP 2 : SENT $6 TO YOUR PAYPAL ACCOUNT This is your only investment to receive the money with ease. With your Paypal account, send $1 to each e-mailadres listed below. !!!!! IMPORTANT !!!!! Be sure to use this SUBJECT : *PLEASE PUT ME ON YOUR EMAIL LIST* when you send the money. 1) martine@pilote.net 2) dexxatol@netcourrier.com 3) armygirl8568@hotmail.com 4) comjii@starband.net 5) sinnek@bellsouth.net 6) nsi@nelasat.com STEP 3 : PUT YOUR E-MAIL ADDRESS ON THE BOTTOM OF THE LIST After you have send $1 to each e-mail address, put your e-mail address on the 6th place. Remove e-mail address number 1, and move each e-mail address 1 step up the ladder. !!!!! IMPORTANT !!!!! BE SURE THAT THE E-MAIL ADDRESS YOU USE IS THE SAME AS YOU USED TO SIGN UP AT PAYPAL. Remember that this is LEGAL. You are creating a service : an e-mail servicelist. STEP 4 : UPLOAD OR COPY THIS MESSAGE TO NEWSGROUPS, FORUMS ETC AND EMAIL IT TO ALL YOUR FRIENDS! There are 32,000 newsgroups. Upload or copy this message to at least 200 newsgroups or forums etc, but ........ remember that the more your upload the more people will see your message and the MORE MONEY WILL FLOW IN. How to upload to newsgroups and forums? : After you have followed step 1,2,3 and 4, save this message (and copy so you can use it again). Use your Internet browser and Outlook Express or another newsreader and try to find FORUMS, NEWSGROUPS, BULLETIN BOARDS, DISCUSSION GROUPS, CHAT SITES and ONLINE COMMUNITIES. Use GOOGLE or use a NEWSERVER. Use every option to post this message. Download PostXpert to send 1 message to more NEWSGROUPS at the same time. !!!!! REMEMBER !!!!! The more you post this message the more MONEY WILL FLOW IN. Why does this Business program work so well !!!!!. Lets asume that from the 200 (or more) messages that you have posted, only 5 people respond, you will have your $6 back that you have invested. Those 5 people will each send at least 200 messages with your e-mailadres on number 4. That's 6 x 6 x $1 = $36. The next 25 people will also send 200 messages with your adres on number 3. That's 36 x 6 x $1 = $216. The next 216 people also send 200 messages with your name on number 2. That's 216 x 6 x $1 = $1296!. Those 1296 people again also send 200 messages with your name on number 1. That will give us a total of 1296 x 6 x $1 = $7,776. Now the last tier! 7776 x 6 x $1 = $46,656!!!!!! This is only a EXAMPLE with 6 reactions. You WILL get MORE responses than that. Remember that most newsservers will leave the posted messages on there servers for about 2 weeks. If you will post your message again, it WILL again start from the beginning. So you can repeat this over and over again. Everyday MILLIONS of people are ONLINE and reading these messages, JUST LIKE YOU RIGHT NOW. I also was sceptical in the beginning and have read a lot of these messages. I also thought that it was bullshit. Until I thought : What the hell!, only $6. What's $6 and a couple of minutes of my time to solve my money problems. !!!!! REMEMBER !!!!! Follow every step, and IT WILL WORK, TRUST ME. !!!!! !!!!! BEST WISHES AND GOOD LUCK !!!!! w)O>+;)<9UVS;F>qaGL<Uq#v`V6(F]- rM;$g+!4IIQ*827?H4 Tag: DataTable Edit Rows Tag: 131952
  - 23
    - SQL UPDATE with a DATE data-type Hi folks, I am doing an UPDATE to a table that has a field for a DATE data type. I am using MS Access. The UPDATE works fine but when I try to place the DATE field in the mix it blows up. The table name is rfi. Here's a code snippet... Dim dtNow As DateTime = DateTime.Now UPDATE [rfi] SET [dateresolved]=dtNow WHERE ([rfi].[id] = @id) It does not like dtNow, so I tried using dtNow.ToString ( ) which it also did not like. Next I changed the data-type for the dateresolved field from DATE to STRING and tried to put in dtNow.ToString ( ) which it still did not like. Finally, I hard coded a string in as "8/15/2006" which it accepted both as a DATE type and as a STRING type. Any ideas on what I may be missing would be appreciated. - Glenn Tag: DataTable Edit Rows Tag: 131951
  - 24
    - Challenging ADO.NET situation (long) I've implemented a solution that I don't really think is very efficient, but I can't really think of a better way to do it. If anyone has any suggestions or citicisms, i'd be grateful to hear them. .NET 2.0/SQL 2000 (not 2005). I have two identical databases that need to be syncronized, seperated by the internet. I've implemented a web service on one server that will return a dataset containing all the currently "active" records. I then need to import (or update) those records into the local database. The records are structured in a simple master/detail format with multiple detail tables, depending on a "type" column in the master (ie some records will use one table for a detail, other records will use another). The complication is that a) I cannot change the schema. It's defined by an off the shelf application. b) Records can be added to either database independantly, but data is always transfered from remote to local, not the other way around. and c) because of b, i caanot depend on the primary key of the master being the same on both sides (an auto-increment identity value). All data besides the primary key should be copied (or updated) from the retrieved dataset to the local database. What i've done is identified some unique rows that I can use to create a secondary (though not "official") key. The database does not constrain these values to be unique, but the application is designed in such a way that it will not allow them to violate the uniqueness. The general flow is like this. I iterate over the master table, then lookup a row in the local database based on the unquie data. I then issue an insert if no records are returned, or an update if one is, tediously copying each field from the datarow to the SqlCommand.Parameters. I then check my local database for any "active" records that do not exist in the dataset returned by the remote host, because a record may have been "closed" between updates. If I find any records not in my remote dataset, I then have to issue a web service call to the remote host to return the single record for the closed record. I then update that record with the returned data ("closing" it). Then I walk through each of the detail tables, doing a lookup in a dictionary of remote:local record mappings that created while walking the master table and insert or update any records there. These records do not have to be updated if the master record has been "closed". This is generally a lot of work, and doesn't seem very efficient. If both databases were local (or even connectable directly via SQL) then I could use a DTS package to do a lot of this much easier (and do a lot more in SQL), but because I have to retrieve the data via a web service, it makes everything more difficult. The key points that I see as inefficient (and am looking for some thoughs on how to simplify) are: 1) Getting the data from my remote dataset to the new database. Manually (and tediously) copying the columns from a datarow to cmd parameters. I tried using two datasets and copying the datarow ItemArray values, but had all sorts of troubles with the dataadapter updates and insertions) 2) having to requery the remote database multiple times for each closed row. It would be more efficient if I could send a list of keys to the remote server and have it return all those rows. Any suggestions there? Any easy way to use something like an array of integers in a SQL parameter to return a list of items in a WHERE clause? I know i could do some stuff with cursors if I had to, but it doesn't seem like it should be that hard. 3) Any general thoughs on my algorithms or any suggestions for alternative ways of achieving this? I'm not married to a web service, but it seems the most efficient. I don't want to "push" changes from the remote server, i'd rather "pull". Thanks. Tag: DataTable Edit Rows Tag: 131949
  - 25
    - SQL2000 error: ... When connecting to SQL Server 2005 The complete error is : An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server) Our db is SQL 2000 running on a Win 2003 cluster, where there is only one instance loaded. The client app is a Windows Service written in VS2005 that runs on a Windows 2000 server. We booted the cluster last night, now we're getting the above error in the service. Anybody else ran into this? Is the name of the default instance on a cluster MyServer\MSSQLSERVER ? Thanks Tag: DataTable Edit Rows Tag: 131947

I've searched and tried a few of the things I seen but nothing really helped
me. I am in visual studio 2003 and using visual c++. I created a table by
typing in the data inside the IDE. Inside the load event for the form I
added rows to the table

ataRow *myRow;

myRow = dataTable1->NewRow();
myRow->Item[COL_COMPONENTS] = S"X-Axis";
myRow->Item[COL_UNITS] = S"Inches";
dataTable1->Rows->Add(myRow);

myRow = dataTable1->NewRow();
myRow->Item[COL_COMPONENTS] = S"Y-Axis";
myRow->Item[COL_UNITS] = S"Inches";
dataTable1->Rows->Add(myRow);

Now I want to edit a row. Change a column that was previously set to a null
value.
What I have so far is
myRow = dataTable1->Rows->Item[rowNum];
myRow->BeginEdit();
myRow->Item[COL_CURRPOS] = tmp;
myRow->EndEdit();
dataTable1->AcceptChanges();

Where rowNum = a known index number of the row I want to change, and
COL_CURPOS is the column I want to make changes to. tmp is the variable
holding the value I want to post to that column of said row. I have tried
without the begin/end edit and without the acceptchanges... nothing seems to
result in the column on my table being changed?

Top

Re: DataTable Edit Rows by William

William
Tue Aug 22 11:40:40 CDT 2006

At the point where you assign the value to the Row Item the data is in the
table. You don't need to call AcceptChanges. What evidence do you have that
the column value is not set? What is RowNum set to?

--
____________________________________
William (Bill) Vaughn
Author, Mentor, Consultant
Microsoft MVP
INETA Speaker
www.betav.com/blog/billva
www.betav.com
Please reply only to the newsgroup so that others can benefit.
This posting is provided "AS IS" with no warranties, and confers no rights.
__________________________________

"Philip" <Philip@discussions.microsoft.com> wrote in message
news:BA3DBCAB-B622-4789-94F6-C99D294E3CDC@microsoft.com...
> I've searched and tried a few of the things I seen but nothing really
> helped
> me. I am in visual studio 2003 and using visual c++. I created a table
> by
> typing in the data inside the IDE. Inside the load event for the form I
> added rows to the table
>
> ataRow *myRow;
>
> myRow = dataTable1->NewRow();
> myRow->Item[COL_COMPONENTS] = S"X-Axis";
> myRow->Item[COL_UNITS] = S"Inches";
> dataTable1->Rows->Add(myRow);
>
> myRow = dataTable1->NewRow();
> myRow->Item[COL_COMPONENTS] = S"Y-Axis";
> myRow->Item[COL_UNITS] = S"Inches";
> dataTable1->Rows->Add(myRow);
>
> Now I want to edit a row. Change a column that was previously set to a
> null
> value.
> What I have so far is
> myRow = dataTable1->Rows->Item[rowNum];
> myRow->BeginEdit();
> myRow->Item[COL_CURRPOS] = tmp;
> myRow->EndEdit();
> dataTable1->AcceptChanges();
>
> Where rowNum = a known index number of the row I want to change, and
> COL_CURPOS is the column I want to make changes to. tmp is the variable
> holding the value I want to post to that column of said row. I have tried
> without the begin/end edit and without the acceptchanges... nothing seems
> to
> result in the column on my table being changed?
>

Top