DataRowView.Row == Null???

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  - 1
    - lock records for update: how? options? Hi, I know ADO.Net recommand using disconnected update (optimistic concurrency) for good reasons, but it's just not an option for us. 99% of our client would rather seeing "record locked" kind of message up front when they load records, than being told "updating failed" after they spend all the time entering the data. So here I am spending a lot of time trying to find a good way to do the "read with lock" type of opration. I know you can do some thing like that, at the query level, if you are running some late version of SQL server, but what if I can't use those DB specific features? Is there a recommanded way of doing this at ADO.Net level"? What about ADO.Net's transaction? If someone can point me to a right direction that would be highly appreciated! Thanks Feng Tag: DataRowView.Row == Null??? Tag: 90159
  - 2
    - SOS! ORA-03114: not connected to ORACLE && MS's Bug?? ORA-03114: not connected to ORACLE && MS's Bug?? DataBase:Oracle 817 using OracleClient,net framework 1.1 I'm using ADO.Net in C# with Oracle 817. and following is my public data access class. using System.Data.OracleClient; public class ComFun { static public IDataReader ComFun_ExeReader(string Sql) { OracleConnection Conn=new OracleConnection(ConfigurationSettings.AppSettings["OracleConnectionString"] ); OracleCommand Cmd=new OracleCommand(); Cmd.CommandText=Sql; Cmd.Connection=Conn; Conn.Open(); OracleDataReader Reader=Cmd.ExecuteReader(CommandBehavior.CloseConnection); return Reader; } static public DataSet ComFun_ExeDataset(string Sql) { OracleConnection Conn=new OracleConnection(ConfigurationSettings.AppSettings["OracleConnectionString"] ); OracleDataAdapter Ad=new OracleDataAdapter(Sql,Conn); DataSet ds=new DataSet(); Conn.Open(); Ad.Fill(ds); Conn.Close(); return ds; } static public Object ComFun_ExeScalar(string Sql) { OracleConnection Conn=new OracleConnection(ConfigurationSettings.AppSettings["OracleConnectionString"] ); OracleCommand Cmd=new OracleCommand(); Cmd.CommandText=Sql; Cmd.Connection=Conn; Conn.Open(); Object Obj=Cmd.ExecuteScalar(); Conn.Close(); return Obj; } } in other .cs files i always coding like this string sql="select person_name,person_age from person"; IDataReader Reader=ComFun.ComFun_ExeReader(sql); DropList.DataSource=Reader; DropList.DataText.....="person_name"; DropList.DataBind(); Reader.Close();Reader.Dispose(); but sometimes returning the following exception "ORA-03114: not connected to ORACLE". sometimes not. Why????? I find a article http://www.dotnet247.com/247reference/msgs/49/248580.aspx And find this one !!!!!!!!!!!!!! " Michael Bachar Hi, I'm using ADO.Net in C# with Oracle9i Release 9.2.0.4.0 when loosing the connection with the Oracle database server the connections doesn't recover and always returning the following exception even when the connection has been restore: "ORA-03114: not connected to ORACLE". I'm closing the connection properly in that it will return to the connection pool. Here is an example code: using(OracleConnection conn = new OracleConnection(connectionString)) { conn.Open(); using(OracleCommand cmd = new OracleCommand(sql, conn)) { object obj = cmd.ExecuteScalar(); } } This should close the connection properly. In the MSDN it is mention that if the connection pooler detect that the connection with the server has been severed it will remove the connection from the connection pool. It appears that this is not happening an I always get bad connections from the pool, even after the connection with the database server has been restore. How can I solve this? What is the proper way to recover from connection lost with database server? Thanks, Michael. !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Angel Saenz-Badillos[MS] (VIP)!!!!!!!!!!! Michael, I am sorry this one is my fault and it is a very bad bug.!!!!!!!!!!!!!!!!!!!! The problem here is that our pooler fails to understand that a 03114 exception means we should not put the connection back in the pool. We have a QFE that fixes this problem by discarding the connection in the following Oracle exceptions. Please let me know if you know of any other exceptions that also result in a connection no longer being valid. oracle exceptions checked case 18: // max sessions exceeded, case 19: // max session licenses exceeded case 24: // server is in single process mode case 28: // session has been killed case 436: // oracle isn't licensed case 1012 //not logged on error case 1033: // startup/shutdown in progress case 1034: // oracle not available case 1075: // currently logged on case 3113: // end-of-file on communication channel case 3114: // not connected to ORACLE case 12154: // can't resolve service name case 12xxx //any error starting with 12 thousand To get the fix please contact PSS directly and request QFE 830173 " ???? Does It's MS's BUG? And What should I Do? Tag: DataRowView.Row == Null??? Tag: 90158
  - 3
    - Speed of inserting data in table SqlServerCE I have written some proof of concept code that adds records to a table, utilizing SqlServerCe, using a parameters in a insert statement. I am forced to read data from a BinaryStream (in the form of a file), assign values to the parameters and execute the sql insert statement from within a while loop The table contains 11 fields, and it currently takes over two minutes to read 4500 records... This is maddness, as I am porting from an old application, and I can accomplish the above in about 2 seconds using my old code (written in OPL) using a device thats 4x slower than the one I'm currently developing on. Anybody have an idea how to speed this up? or mybe a sneaky workaround... :) Regards BM Tag: DataRowView.Row == Null??? Tag: 90156
  - 4
    - Data Form Wizard Question. Hello, Is there a way to make the data form wizard create windows forms using sqlConnection, sqlDataAdapter and sqlCommand instead of OleDBConnection, OleDbDataAdapter since all my projects deal with SQL 2k server? Thank you in advance. Tag: DataRowView.Row == Null??? Tag: 90154
  - 5
    - SqlDbType not Found using VB.NET (compact framework) I am trying to populate a table in a table in a database I have created using parameters. The following line doesn't work. cmd.Parameters.Add(New SqlCeParameter("CUniq", SqlDbType.Shortint)) due to the fact that SqlDbType is not found. (not declared) I have the following imports. Imports System.IO Imports System.Data.SqlServerCe Imports System.Data.Common Imports System.Data The documentation says that SqlDbType enumeration is a member of the System.Data namespace, but I can't find in the tab completion. Please, any explanation or commentary is very appreciated... Regards, BM Tag: DataRowView.Row == Null??? Tag: 90153
  - 6
    - load tables with constraints Hi How to lad tables from database to dataset with constraints. Thanks Konrad Tag: DataRowView.Row == Null??? Tag: 90152
  - 7
    - relationship Hi How to create relation in SQL Server Database programatically? Thanks Konrad Tag: DataRowView.Row == Null??? Tag: 90146
  - 8
    - Using a datagrid to display info from database Is it possible to be able to select a single row in a datagrid and use that selection to open a new form that contains all of the data in the row? I'm working on a home inventory program in VC++ with a database backend and I'd like to be able to standardize the forms used. But I can't get around an effective means to edit a selected data item. Any ideas? Thanks! Alex Posted Via Usenet.com Premium Usenet Newsgroup Services ---------------------------------------------------------- ** SPEED ** RETENTION ** COMPLETION ** ANONYMITY ** ---------------------------------------------------------- http://www.usenet.com Tag: DataRowView.Row == Null??? Tag: 90141
  - 9
    - Getting information messages back in real-time Hello, It's possible to create messages in SQL Server 2000 that get sent to the client immediately, by using RAISERROR ... WITH NOWAIT. For example, the following code works great in Query Analyzer: RAISERROR(N'Message 1', 0, 1) WITH NOWAIT WAITFOR DELAY '00:00:02' RAISERROR(N'Message 2', 2, 1) WITH NOWAIT WAITFOR DELAY '00:00:02 RAISERROR(N'Message 3', 4, 1) WITH NOWAIT WAITFOR DELAY '00:00:02' However, I find that when I try to execute a script or procedure from ADO.NET, and try to receive these messages using the InfoMessage delegate, I don't get them until the very end, all in one chunk. I'm writing a long-running procedure, and I'd like the client to be able to receive status messages to print to the console. Is there any way to get messages to get sent to the client in real-time? Thanks, Brian Posted Via Usenet.com Premium Usenet Newsgroup Services ---------------------------------------------------------- ** SPEED ** RETENTION ** COMPLETION ** ANONYMITY ** ---------------------------------------------------------- http://www.usenet.com Tag: DataRowView.Row == Null??? Tag: 90136
  - 10
    - Multiple XML nodes with the same tag + DataRow access? hello, I have the following xml structure which I load into a DataRow (the xml document is loaded into a dataset...) <EXMAPLE_NODE> <A>string1</A> <B>string2</B> <C>string3</C> <D>string4_1</D> <D>string4_2</D> <D>string4_3</D> </EXMAPLE_NODE> I know I can Access nodes A,B &C using indexed access. How can I access the D nodes (I don't want unique names for them)? Is there anyway to access these via a foreach iteration? Thank you in advance, Jamie Tag: DataRowView.Row == Null??? Tag: 90134
  - 11
    - DataSet filtering Hi, If I retreive a set of records from my database e.g. NAME GROUP John Beetles John Sting John Queen Bob Brittany and I have in a dataset. If I want to display in a list Bob John is there an easy way to do a operation such as SELECT DISTINCT NAME FROM DATASET so that I can filter it without doing another database call? thanks Tim Tag: DataRowView.Row == Null??? Tag: 90131
  - 12
    - excel question i have oledb connection with this string "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\Downloads\sase2.xls;Extended Properties="Excel 8.0;HDR=Yes;IMEX=1"" and work fine with normal *.xls file but when file is saved as web page i get error initializing connection. What i need to do to read that excel document? thx Tag: DataRowView.Row == Null??? Tag: 90128
  - 13
    - Using the FillSchema I have a question about the Fillschema method. According the documentation the schema is built base on the contents of the SelectCommand. I using stored procedure to load tables in the dataset. I also use the fillschema to load the schema into my datatable. I'm not sure if things are working as I think they should. How would I get a schema loaded if I'm not using the Select query in the selectcommand? I'm using stored procedures instead. I have sample code below: Sub CheckForAlertData(ByVal MinDevice As String) Dim AlertDBConnection As SqlConnection = New SqlConnection(AlertVar.AlertConnectionString) Dim AlertHist_ID As Integer Dim AlertVehiclServiceID As Integer Dim AlertOdometerID As Integer Dim AlertReading As Integer Dim ServiceID As Integer Dim AlertThreadConnection As SqlConnection = New SqlConnection(AlertVar.AlertConnectionString) 'Read Min_GPS_History to get Min Device detail Dim AlertThreadDataCMD As SqlCommand = New SqlCommand("SelectMinGPSHistoryByMin", AlertThreadConnection) AlertThreadDataCMD.CommandType = CommandType.StoredProcedure Dim AlertThreadParm As SqlParameter = AlertThreadDataCMD.Parameters.Add("@MinDevice", SqlDbType.VarChar, 10) AlertThreadParm.Direction = ParameterDirection.Input AlertThreadParm.Value = MinDevice AlertThreadDataCMD.Parameters.Add(AlertThreadParm) Dim AlertDA As SqlDataAdapter = New SqlDataAdapter(AlertThreadDataCMD) AlertThreadConnection.Open() AlertDA.FillSchema(AlertDS, SchemaType.Source, "MinGPSHistory") AlertDA.Fill(AlertDS, "MinGSPHistory") AlertDBConnection.Close() End Sub Thanks Tag: DataRowView.Row == Null??? Tag: 90126
  - 14
    - Getting data from a dataset one field at a time I have create a dataset that contains only the data that I want. Now I want to display the data a field at a time. How do I retreive the data in order to display it? I have included a code sample below: Private Sub GetDataByEventType(ByVal AlertType) Dim AlertTypeData As DataTable = AlertDS.Tables("AlertDetail") ' Check for Alert Type of Speeding as an EventType. Dim AlertExpression As String ' Dim EventType as String = 'Dim TypeOFAlert As String = AlertType AlertExpression = "EventType = 'Speeding' and Speed > EventDataLow" Dim AlertsFound() As DataRow ' Use the Select method to find all rows matching the filter. AlertsFound = AlertTypeData.Select(AlertExpression) Dim Alert As Integer ' Send Message to Screen of each returned row. For Alert = 0 To AlertsFound.GetUpperBound(0) Console.WriteLine(AlertsFound(Alert)(0)) ' MsgBox("Min Number: " & Min_Num & "is Speeding" & "Speed is: " & Speed) Next Alert End Sub Tag: DataRowView.Row == Null??? Tag: 90119
  - 15
    - .NET and SQL Server on Separate Machines Hi all, We're working on an ASP.Net Web Application that makes several calls to a SQL Server database. Everything was running correctly when the database and the web server were on the same computer, but we have sinced moved them to separate computers; IIS V6 on Win2000 and SQL Server 8(SP3) on Win Serv 2003 Ent. The connection string in our web.config file originally looked like this: <add key="ConnectionString" value="server=localhost;Trusted_Connection=true;database=Store;" /> After moving the database (and changing the server in the connection string), we started to receive this error: "Login failed for user '(null)'. Reason: Not associated with a trusted SQL Server connection." We ended up changing the connection string to look like this: <add key="ConnectionString" value="Integrated Security=SSPI;Initial Catalog=Store;Data Source=192.168.0.12;" /> This string only works if we add the following to the .config file: <authentication mode="Windows" /> <identity impersonate="true" /> Unfortunately, the web application was designed to use forms authentication, so we're still looking for a valid connection string. We've tried setting Trusted_Connection=false and providing a username and password, but we get the same error as before - only with the provided username listed instead of (null). We've tried setting the database to mixed mode, and Win Auth only and got the same results. Any help would be greatly appreciated. -- Jason DeCock Elk River Systems, Inc. http://www.elkriversystems.com Tag: DataRowView.Row == Null??? Tag: 90118
  - 16
    - VB.NET PROJECT to C# Project conversion Hi, DO we have any tool which will help us to convert the web project from the VB.NET to C# language? Thanks, Vijay Tag: DataRowView.Row == Null??? Tag: 90112
  - 17
    - KeyInfo using Data Access Application Block for .NET Is there a way to retrieve the KeyInfo using the Microsoft Data Access Application Block for .NET? I want to use either a DataSet or SqlDataReader object to grap the primary key information from the columns. Tag: DataRowView.Row == Null??? Tag: 90104
  - 18
    - 405 error on put I am trying to upload a pdf file to a web server. The server is local right now for testing. I am running xp, iis5 I get a 405 error on the post, please help. String uriString = "http://localhost/PineNet/"; WebClient myWebClient = new WebClient(); string fileName = txtFilename.Text; byte[] responseArray = myWebClient.UploadFile(uriString,"POST",fileName); Posted Via Usenet.com Premium Usenet Newsgroup Services ---------------------------------------------------------- ** SPEED ** RETENTION ** COMPLETION ** ANONYMITY ** ---------------------------------------------------------- http://www.usenet.com Tag: DataRowView.Row == Null??? Tag: 90101
  - 19
    - Viewstate works on test server but not production server Please help! I am tearing out my eyes trying to figure this out. I have a test server IIS 5.0 and a production server IIS 6.0. The test server holds the viewstate of a 3 dropdowns with a problem. However, the production server only holds the viewstate of 2 of the dropdowns. Why would it work on one server and not the other? Why would it work for 2 of the controls but not all 3? THANK YOU IN ADVNACE FOR THE HELP. I am using ASP.NET with VB (no code behind). Here is a snippet of the code. DropList_OS is the problematic dropdown. <asp:DropDownList id="dropList_Dates" runat="server" dataTextFormatString="{0:d}" CssClass="Headings" AutoPostBack="True"> <asp:ListItem Value="{0}" Selected="True"></asp:ListItem> </asp:DropDownList> <asp:DropDownList id="dropList_Regions" runat="server" CssClass="Headings" AutoPostBack="True"> <asp:ListItem Value="{0}" Selected="True"></asp:ListItem> </asp:DropDownList> <asp:DropDownList id="dropList_OS" runat="server" CssClass="Headings" AutoPostBack="True"></asp:DropDownList> Tag: DataRowView.Row == Null??? Tag: 90094
  - 20
    - Annotations in Strongly typed datasets with webservices hi, I am using annotiations in my xsd schema. the dataset is generated correctly on my webservice, but when i add a webreference to the webservice from another webservice, the dowloaded xsd schema from my webservice doesn't contain the annotiated names, my codegen namespace is filtered out of the xsd schema. Has anyone an idea to resolve this Tag: DataRowView.Row == Null??? Tag: 90091
  - 21
    - Add sorting to SQLDataAdapter at runtime. How? I have a SQLDataAdapter that I have configured. Since I want to tie this to a DataGrid and add sorting to the datagrid, I do not want to configure the adapter with sorting. I want to be able to add the sorting at runtime depending on the column that the user clicked on the datagrid. I am probably missing something very simple here. Below is the code that I am using to fill my datagrid. Thanks in advance! sqlMfgNumber.SelectCommand.Parameters(0).Value = "%" & txtSearchFor.Text.Trim & "%" sqlMfgNumber.SelectCommand.Parameters(1).Value = strOmittedNumber sqlMfgNumber.Fill(DsMfgNumberSearch1) If DsMfgNumberSearch1.Tables(0).Rows.Count > 0 Then lblError.Visible = False Datagrid1.DataSource = DsMfgNumberSearch1 Datagrid1.DataBind() Else lblError.Visible = True End If Tag: DataRowView.Row == Null??? Tag: 90090
  - 22
    - Persistance UPDATE problem - revised Q for clarity I'd like to clear up a very long-standing problem I have had only because I have done a little more testing, but the problem is still there. On Page_Load event, the textfields on my page fills with the personal data stored in a SQL DB, as follows: Dim cn As SqlConnection Dim cmd As SqlCommand Dim rdr As SqlDataReader cn = New SqlConnection("xxx") cn.Open() cmd = New SqlCommand("SELECT SName FROM ClientDetails WHERE clientRef=100", cn) rdr = cmd.ExecuteReader() rdr.Read() 'fill the surname textbox txtSName.Text = rdr("ColSurName") cn.Close() e.g. pretend the value of the colSurNamel in the DB is 'Smith' Then on the form my clients can update their details by simply overwriting the text in the textboxes and hitting the UPDATE button. Assume I have now updated the textbox with 'Bloggs' and I've hit the UPDATE button (code as follows): Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim conCOMP As SqlConnection Dim cmdUPDATECOMP As SqlCommand conCOMP = New SqlConnection("xxxxxx") strCOMP = "UPDATE ClientDetails SET colSurName= '" & txtSName.Text & "' WHERE ClientRef = 100" cmdUPDATECOMP = New SqlCommand(strCOMP, conCOMP) Label4.Text = strCOMP conCOMP.Open() cmdUPDATECOMP.ExecuteNonQuery() conCOMP.Close() End Sub I've added a label here to view the value of the UPDATE command when it is passed BUT it gives the value already stored in the DB / or rather the value it already got in the Page_Load routine: the text in Label4 is: " UPDATE ClientDetails SET colSurName = 'Smith' WHERE ClientRef = 100 " I think it is obviously the text box variable: having got a value for when the Page_Load event occurs. But how can my clients change the text boxes to update their details and hit UPDATE?????? PLEASE PLEASE HELP. This seriously has been BUGGing me for a month. My Client is not happy :( Tag: DataRowView.Row == Null??? Tag: 90089
  - 23
    - Stupid XML Serialisaton and Web Services My company's XML webservice has several methods that pass back= serialised data, and all seemed well during testing, and during= the first few weeks of deployment=2E But people are coming back to= me saying that the keep getting the error "DataRelation cannot= be serialized because it does not have a default public= constructor" when they browse to the URL of the Web Service=2E But= it does have a public constructor, it really does, and now it's= driving me up the wall=2E Thanks -------------------------------- Matthew Carter Development Manager Applied Language http://www=2Eappliedlanguage=2Ecom ----------------------- Posted by a user from =2ENET 247 (http://www=2Edotnet247=2Ecom/) <Id>eDIiibqwKEyiHx8pwjI4lA=3D=3D</Id> Tag: DataRowView.Row == Null??? Tag: 90084
  - 24
    - Stupid XML Serialisaton and Web Services My company's XML webservice has several methods that pass back= serialised data, and all seemed well during testing, and during= the first few weeks of deployment=2E But people are coming back to= me saying that the keep getting the error "DataRelation cannot= be serialized because it does not have a default public= constructor" when they browse to the URL of the Web Service=2E But= it does have a public constructor, it really does, and now it's= driving me up the wall=2E Thanks -------------------------------- Matthew Carter Development Manager Applied Language http://www=2Eappliedlanguage=2Ecom ----------------------- Posted by a user from =2ENET 247 (http://www=2Edotnet247=2Ecom/) <Id>CYL2gyk18kiRmISG88IWbw=3D=3D</Id> Tag: DataRowView.Row == Null??? Tag: 90083
  - 25
    - Autoincrementing Primary Keys with PostGres I am using an ODBC connection to a PostGres database, that has various tables that use SERIAL types to implement automatically incrementing primary keys. My problem is that I have a dataset containing tables that I have turned AutoIncrement on, and set the seed and step to -1. My update statement works a treat, and any new rows are added sequentially to the end of the table. However, I need a way of immediately returning a new rows primary key, in order to keep the dataset up to date. I know that in SQL Server you can use the @@IDENTITY feature, to immediately return the last used value. Is there something similar in PostGres? I have tried adding a 'SELECT CURRVAR('public.equipmenttype_equipmenttypeid_seq') just after my insert statement (which is the SQL that you use to find out the current sequence id in PostGres), but I am not sure of the ODBC syntax needed to get this information into a parameter (I assume I would need to use a ParameterDirection.ReturnValue). This problem has been vexing me for a few days now. Any ideas or a better way of handling autoincrementing keys would be gladly received. Tag: DataRowView.Row == Null??? Tag: 90076
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  - 1
    - DataTable column question Hi! It's easy to add Columns into DataSet DataTable for example like this way ... ds.Tables("MyTable").Columns.Add("MyColumn", GetType(Integer)) ... but how can I remove this column of the DataSet which was created earlier by code? Do I have to create whole new DataSet table again? I mean something like ds.Tables("MyTable").Columns.Remove("MyColumn") - ofcource it's not possible to do like this way :) I tried ... ds.Tables("MyTable").Columns("MyColumn").Dispose() ... but it doesn't seem to do what I want. -- Thanks in advance! Mika Tag: DataRowView.Row == Null??? Tag: 90065
  - 2
    - Persistent UPDATE Problem Hi there I have had an application where I have not been able to successully add an 'update details page' for my clients logged in to the website. I have posted a query on this before and the result was that the WHERE clause was probably wrong; without success....but I have added a test labels to test so now know a little more so hopefully you can help. Have ASP.NET / SQL Server 2000. The web app has a members area which is https. i'm using authenication ticket which stores the member ID ref as a state variable called 'MemberRef' So problem page.... When this UPDATE PERSONAL DETAILS page loads, it fills the textboxes on the page with a datareader according to who is logged in. One textbox example is as follows: txtFirstName.Text = rdr("colFName") Then of course I need a process so my members can update their personal details stored in the DB, so those text boxes allow updates and I've added a button which should update the DB Private Sub ButUpdatePractice_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) 'Handles ButUpdatePractice.Click Dim strCOMP As String Dim conCOMP As SqlConnection Dim cmdUPDATECOMP As SqlCommand conCOMP = xxx cmdUPDATECOMP = New SqlCommand(strCOMP, conCOMP) strCOMP = "UPDATE ClientDetails SET colFName = @Fname WHERE MemberRef = @MemberRef" cmdUPDATE.Parameters.Add("@Fname", txtFirstName.Text) cmdUPDATE.Parameters.Add("@@MemberRef", MemberRef) conCOMP.Open() cmdUPDATECOMP.ExecuteNonQuery() conCOMP.close -now plrease ignore any misspellings above - done it for speed for this forum. Now this doesn't update the DB when pressing the update button. It re-freshes the page. I've added a label to the page which shows the strCOMP update string on the page to test ( label1.text = strCOMP ) and it contains the existing value from the DB. Please help. Tag: DataRowView.Row == Null??? Tag: 90062
  - 3
    - Dataset constraint violoation with null foreign key value Hi, I'm loading a dataset from a cached viewstate version of the dataset created on a previous http request. When I read the call ReadXml on the typed dataset, I get: "Failed to enable constraints. One or more rows contain values violating non-null, unique, or foreign-key constraints" I suspect this is due to a field in one of the tables which can be null, but if it is not null it is a foreign key to another dataset table. At present the field in this table is null (in the database). What attributes of the dataset table field, or the dataset constraint should I set to indicate null values don't violate the constraint? Thanks Martin Tag: DataRowView.Row == Null??? Tag: 90061
  - 4
    - Datagrid hide identical columns from a JOIN I do not normally use JOINS in my queries these days, but I have some instances where I am simply showing historical data in a grid, and it is thus much more convenient to JOIN everything I need in one stored procedure. Thus I might end up with data from 3, 4 or more tables -- some with identical names (the JOIN criteria). I know how to hide columns in a straightforward query, but how about in a JOIN query where you may have 2 or even 3 or more identical field names (IDs usually)? How do you hide, for example, the SalesID from the 2nd table or the from the 3rd table? For example, the following statement works for the first SalesID, but what about the other JOINED SalesID fields? (I've tried "SalesID1" and "Expr1", but no joy except SalesID1 seems to work on a simple query with 2 joined tables). ds.Tables("dtSalesPayments").Columns("SalesID").ColumnMapping = MappingType.Hidden Tag: DataRowView.Row == Null??? Tag: 90057
  - 5
    - .NET SQL Client: Connection pooling issue Hi All Follow up to my last week' postings on connection pooling issue we experience. Thanks all for your replies but since I still don't have a solution ? I've decided to start a new thread. Here is a link to the original thread: http://tinyurl.com/yu68q We use SQL Client (SqlCommand, SqlConnection and SqlDataReader) in our 3-tiered ASP.NET app written in C#. The problem we are running into is that under heavy load the number of pooled connections increases approximately by the current pool size every time the garbage collector kicks in. This happens even when only about 60 connections exists in the pool with the max size of 100. The number of pooled connections does not grow until the GC engages and ? the most puzzling ? the new connection pool is being created at that very moment. I rely on .NET CLR Data performance counters which I suspect might not be reliable. But if they aren't ? what is? The documented MS Knowledge base issue with the counters http://support.microsoft.com/default.aspx?scid=kb;en-us;314429 doesn't seem to apply here) I also follow all the good coding practices such as closing the connection and DataReader in the finally block. I do not have any destructors or Finalize implementations in the app as well. I have performance monitor screenshots for all interested. Any ideas? Thank you! Tag: DataRowView.Row == Null??? Tag: 90054
  - 6
    - HLP: Adding Column Info to ListView What I'm trying to do is to Add the information of Two Tables into a single ListView. The ListView has 10 columns. The following Code populates the LV columns 1 to 5 (or rather 0 to 4) from a DataSet... Private Sub MstrEmPay() Dim dtDataTbl As DataTable = DsMstrEmPay.MASTER_PRM_EMPLOYEE_PAY ' Get Info from Data Base For cntr = 0 To DsMstrEmPay.MASTER_PRM_EMPLOYEE_PAY.Rows.Count - 1 Dim dr As DataRow = dtDataTbl.Rows(cntr) Dim LItem As New ListViewItem Dim rowTtl As Double = 0 LItem = New ListViewItem LItem.Text = dr("amount") LItem.SubItems.Add(dr("employee")) LItem.SubItems.Add(dr("pay_id")) LItem.SubItems.Add(dr("pay_type")) lvProjDisplay.Items.Add(LItem) Next ' cntr End Sub What I want to do is to get the info of another DataSet and dump it's info into the next 5 remaining Columns (starting at the first row of the ListView). I've done some reading and I 'think' I need something like: LItem.SubItems.Insert(5, myTextHere)... but haven't found how to make this work. Anyone can help? Regards, Bruce Tag: DataRowView.Row == Null??? Tag: 90053
  - 7
    - SQL Server JOBS Hi!. I am developing a windows application where i need to give users alerts about their pending jobs once they login into the application. I am trying to create SQL Server jobs to give those alerts( If anyone has any other option kindly post the same). now can anyone tell me how do i populate the alert on the user machine. Thanks in advance Baren Tag: DataRowView.Row == Null??? Tag: 90048
  - 8
    - Het zal toch niet zijn wie ik denk dat het is? Is het die Ear Youth weer? Nee, het is Arjen Jongeling! Het is een kwestie van geduld voor heel usenet Hollands lult Tag: DataRowView.Row == Null??? Tag: 90044
  - 9
    - Making an app run on a local area network. I realize I have asked this question before and the answer is slowly becoming clearer but I do not yet quite have it in place. I have a VB.net application that I have written from a client machine of a local area network. The LAN has a dedicated file server. The solution is located in a shared directory of the LAN's file server The drive letter is F. The application is bound to a SQL Server 2000 database that also resides in a shared directory on the F drive of the file server. My application works on the machine I am using but then I have a full blow copy of VS 2003 installed on the machine. I would like to be able to run the application from other machines on the local area network. These other machines all have Windows XP Pro installed and the .net framework. What do I need to do in order for this to happen? If I understand correctly I do not have to even worry about creating a .MSI file; I can simply point the other machines to the .exe file that is created in the Bin directory of the application that, again, is located in a shared directory of the server. Is this right? What else do I need to do in order to make (allow) this application to run from other machines on the Local Area Network? Tag: DataRowView.Row == Null??? Tag: 90042
  - 10
    - Cannot change row in RowUpdating event Hi, I had expected to be able to change the DataRow that is passed into the RowUpdating event, but for some reason it does not seem to work. Am I doing something wrong or is a workaround? -- Thanks in advance, Juan Dent, M.Sc. Tag: DataRowView.Row == Null??? Tag: 90041
  - 11
    - detaching an XmlDataDoc from a DataSet Hi All, I've got an XmlDataDocument that is attached to a DataSet with one DataTable in it. Then I take the XML as text and throw it into a Text Box on a form. Later on, I wanted to add another DataTable to the DataSet and it complained: Cannot add or remove tables from the DataSet once the DataSet is mapped to a loaded XML document. How do/can I detach the XMLDataDoc from the DataSet? Thanks! Corey. Tag: DataRowView.Row == Null??? Tag: 90040
  - 12
    - ADO Shape command to return XML I'd like to be able to utilize the ADO Shape syntax to return XML. I've seen examples in MSDN that returns an OLEDB DataReader of this hierarchical data..however I'd like the XML out of it. I've done this in the previous version of ADO, but I haven't figured out how to do this in ADO.NET. Any insight would be appreciated. Many thanks- Dan Tag: DataRowView.Row == Null??? Tag: 90033
  - 13
    - How to create data adapter for multiple tables (joint tables)? I use sql builder to create a dataadapter. If there is only one table, the insert/update/delete commands are automatically created successful. However, if I build a select command based on multiple tables, I got errors: "insert/update/delete commands can't create automatically for multiple tables...?". Any of you know how to accomplish this? Any suggestions are greatly appreciated. -V Tag: DataRowView.Row == Null??? Tag: 90023
  - 14
    - Query Analyzer speed vs. SqlCommand.ExecuteReader speed All, I have an SP that takes about 5 seconds to run before any caching performed by SQL server (I run DBCC DROPCLEANBUFFERS to make sure in my tests). When I hook the SP into a SqlCommand object, the SP Cmd.ExecuteReader line takes about 5 seconds every time I reload the page. But if I run it through Query Analyzer it takes 5 seconds for the first run and every subsequent request is less than half a second. I assume this is behavior of Sql Server caching the tables/results. My question is why would Cmd.ExecuteReader take 5 seconds each time if Sql Server is indeed caching teh tables/results (as evidenced by the fast subsequent QA calls)? It is possible there is SET environment variable being called by SqlCommand, or a lack of variable in the connection string that causes the ExecuteReader to take so long each time? Thanks, JL Tag: DataRowView.Row == Null??? Tag: 90022
  - 15
    - global connection or seperate connections for each stored proc cal Hi I seem to recall reading that it can be a bit risky using just 1 global data connection in the global.aspx file, instead of multiple connections, but can not recall why. Also is there a lot of overhead with multiple connections? I did a search but did not find anything. Thanks. -- Paul G Software engineer. Tag: DataRowView.Row == Null??? Tag: 90017
  - 16
    - sqladapter question I create the sqladapter programmically. Dim daInvoice As new sqladapter ("select * from invoice",conMaster) daInvoice.fill(dsInvoice) bmInvoice = Me.Bindingcontext(....etc) Me.txtInvoiceNo.DataBindings.Add("text", dsInvoice,"invoice.invno") Now, in my add click event. (bmInvoice.addnew()) in my save event. daInvoice.update(dsInvoice,"Invoice") <-- I got an error here, it said I need to declare the updatecommand first. dsInvoice.update() my invoice got over 50 fields name , DO I need to create 50 parameters in the commandtext ??? anyshort to update this tables ?? Thanks From Agnes Tag: DataRowView.Row == Null??? Tag: 90012
  - 17
    - Informix .net provider - Sql server .net provider Hello everybody We are currently writting a small app that will be delivered on an Informix DB and a Sql Server DB. We will be doing some performance check pretty soon for both databases. Is anybody using something else other than the IBM informix provider, and the regular SqlServer provider coming with the .net framework ? And if so, anybody happy with the ones they chose ? Regards Tag: DataRowView.Row == Null??? Tag: 90011
  - 18
    - How to know total records selected? Hello Group, How can i obtain the total no of records selected with the help of Datareader class. rowsaffected does not seem to work. Thanks Anand Tag: DataRowView.Row == Null??? Tag: 90009
  - 19
    - System.InvalidCastException Hi ! First of all, I apologize for my poor english... I've a cast problem with the code you can find below. I really don't understand why ? I'm trying to make a very simple WindowsForm application wich works with the customers table of the northwind database. You can find the database hear : http://www.microsoft.com/downloads/details.aspx?FamilyID=C6661372-8DBE-422B-8676-C632D66C529C&displaylang=EN There is no problem if you remove this line of code : Me._dg.TableStyles.AddRange(New System.Windows.Forms.DataGridTableStyle() {Me._ts}) I just want to populate my DataGrid with the CustomerID (and later the CompanyName) and using styles seems to be a good way to do this ? Can every one help me to find what's the problem with my code...? Any help would be appreciated. Hervé **** code **** Imports System Imports System.Drawing Imports System.Windows.Forms Namespace DefaultNamespace Public Class MainForm Inherits System.Windows.Forms.Form Private _cnx As System.Data.OleDb.OleDbConnection Private _tbcID As System.Windows.Forms.DataGridTextBoxColumn Private _ds As System.Data.DataSet Private _cmdSelect As System.Data.OleDb.OleDbCommand Private _ts As System.Windows.Forms.DataGridTableStyle Private _dg As System.Windows.Forms.DataGrid Private _da As System.Data.OleDb.OleDbDataAdapter Public Shared Sub Main Dim fMainForm As New MainForm fMainForm.ShowDialog() End Sub Public Sub New() MyBase.New ' ' The Me.InitializeComponent call is required for Windows Forms designer support. ' Me.InitializeComponent ' ' TODO : Add constructor code after InitializeComponents ' Me._da.Fill(Me._ds, "Customers" ) End Sub #Region " Windows Forms Designer generated code " ' This method is required for Windows Forms designer support. ' Do not change the method contents inside the source code editor. The Forms designer might ' not be able to load this method if it was changed manually. Private Sub InitializeComponent() Me._da = New System.Data.OleDb.OleDbDataAdapter Me._dg = New System.Windows.Forms.DataGrid Me._ts = New System.Windows.Forms.DataGridTableStyle Me._cmdSelect = New System.Data.OleDb.OleDbCommand Me._ds = New System.Data.DataSet Me._tbcID = New System.Windows.Forms.DataGridTextBoxColumn Me._cnx = New System.Data.OleDb.OleDbConnection CType(Me._dg,System.ComponentModel.ISupportInitialize).BeginInit CType(Me._ds,System.ComponentModel.ISupportInitialize).BeginInit Me.SuspendLayout ' '_da ' Me._da.SelectCommand = Me._cmdSelect ' '_dg ' Me._dg.CaptionVisible = false Me._dg.DataMember = "" Me._dg.DataSource = Me._ds Me._dg.Dock = System.Windows.Forms.DockStyle.Left Me._dg.HeaderForeColor = System.Drawing.SystemColors.ControlText Me._dg.Location = New System.Drawing.Point(0, 0) Me._dg.Name = "_dg" Me._dg.ReadOnly = true Me._dg.Size = New System.Drawing.Size(204, 418) Me._dg.TabIndex = 0 Me._dg.TableStyles.AddRange(New System.Windows.Forms.DataGridTableStyle() {Me._ts}) ' '_ts ' Me._ts.DataGrid = Me._dg Me._ts.GridColumnStyles.AddRange(New System.Windows.Forms.DataGridColumnStyle() {Me._tbcID}) Me._ts.HeaderForeColor = System.Drawing.SystemColors.ControlText Me._ts.MappingName = "Customers" Me._ts.ReadOnly = true ' '_cmdSelect ' Me._cmdSelect.CommandText = "select * from Customers" Me._cmdSelect.Connection = Me._cnx ' '_ds ' Me._ds.DataSetName = "Customers" Me._ds.Locale = New System.Globalization.CultureInfo("fr-FR") ' '_tbcID ' Me._tbcID.HeaderText = "ID" Me._tbcID.MappingName = "CustomerID" Me._tbcID.NullText = " " Me._tbcID.ReadOnly = true Me._tbcID.Width = 80 ' '_cnx ' Me._cnx.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Password="""";Data Source=E:\Projets\Customers\bas"& _ "e\Nwind.mdb;Persist Security Info=True" ' 'MainForm ' Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13) Me.ClientSize = New System.Drawing.Size(564, 418) Me.Controls.Add(Me._dg) Me.Name = "MainForm" Me.Text = "MainForm" CType(Me._dg,System.ComponentModel.ISupportInitialize).EndInit CType(Me._ds,System.ComponentModel.ISupportInitialize).EndInit Me.ResumeLayout(false) End Sub #End Region End Class End Namespace Tag: DataRowView.Row == Null??? Tag: 89998
  - 20
    - Common DataSource gives unexpected behavior with comboboxes When I have 2 comboboxes whos datasource is the same datatable I get some unexpected (and unwanted) behavior. When I change the selection in either combobox, the other changes to match it. The behavior probably applies to other controls as well. I would guess binding is being overly helpful, but I need to know how to disable it. I've considered just making of copy of my datatable for one of the controls, but I doubt that is the proper solution. Tag: DataRowView.Row == Null??? Tag: 89991
  - 21
    - Make data available to Excel, Access, ... Hi, sorry for the cross post, but don't know which of both groups would be the best one. I have implemented a .Net DataReader and DataAdapter for our custom data and it works fine so far. Now I want to make the data available to Excel, Access, ... One solution would be to develop a OLEDB Provider in C++ via ATL Templates. But I wonder if there is a simpler way!? Can I develop a OLEDB Provider in C#? Or is there a mapping between OLEDB and .Net Datasources? regards, Achim Tag: DataRowView.Row == Null??? Tag: 89987
  - 22
    - is there a performance benefit when using Prepare() on command that Hi, I was just reading the book "ADO.NET in a Nutshell". In the chapter on the Command-Object (p. 36) it reads: "A parameterized command won't improve performance as compared to the original dynamic SQL statement. Unlike a stored procedure, a parameterized query isn't stored in the database and isn't precompiled. The difference is simply one of syntax." OK. Sounds plausible to me. But i recalled reading something different to that on MSDN. The article "Best Practices for Using ADO.NET" (http://msdn.microsoft.com/library/en-us/dnadonet/html/adonetbest.asp?frame=true#adonetbest_topic4) includes the following: "The Command.Prepare method can improve the performance of parameterized commands that are repeated at your data source. Prepare instructs the data source to optimize the specified command for multiple calls. To use Prepare effectively, you need to thoroughly understand how your data source responds to the Prepare call. For some data sources such as SQL Server 2000, commands are implicitly optimized and a call to Prepare is unnecessary. For other data sources such as SQL Server 7.0, Prepare can be effective." So, who is right? Or am I just getting something wrong and mixed up? Is the effect of the Prepare()-call specific to the data source? Does it only work with SPs or also with plain SQL-Text? Any help will be greatly appreciated. Thanks in advance, Lorenz Tag: DataRowView.Row == Null??? Tag: 89985
  - 23
    - Inserting Nulls into a Dataset Hi I have a simple table which allows nulls. Using a Dataset I have added a new rows to the table specifying the values for the columns I have and leaving the others. When I come to run the update command via the dataadapter the insert stored procedure fails because the parameters corresponding to the null fields in the dataset and not supplied. How do I get round this? Regards Tag: DataRowView.Row == Null??? Tag: 89984
  - 24
    - RE: SQLCE Problem on Create Table *The code is below. It always stuck on line "command4.ExecuteNonQuery()" and it throws an Sqlce exception Under Public Class Form1 definition: Private Const filename4 As String = "MUSTERI.SDF" Private connstr4 As String = String.Format("Datasource={0};Password={1}", filename4, "Admin") Private connection4 As SqlCeConnection Under Private sub CreateDB Click(): Dim engine4 As New SqlCeEngine(connstr4) If Not File.Exists(filename4) Then engine4.CreateDatabase() Else MsgBox("FILE EXISTS") End If engine4.Dispose() connection4 = New SqlCeConnection(connstr4) connection4.Open() Dim command4 As SqlCeCommand = connection4.CreateCommand command4.CommandText = "CREATE TABLE MUSTERI (INDEXMS nvarchar(5),MSAD nvarchar(30),MSSOYAD nvarchar(30),MSSEMT nvarchar(30),MSSEMTRCH nvarchar(30),MSTLF nvarchar(15),FIYAT nvarchar(3),INDEXBY nvarchar(4),VHMARKA nvarchar(30),VHMODEL nvarchar(50),VHLSEBAT nvarchar(20),VHYIL nvarchar(4),LASONMRK nvarchar(20),LASONDSN nvarchar(30),LASRKMRK nvarchar(20),LASRKDSN nvarchar(30),VHDSSGON nvarchar(10),VHDSSGRK nvarchar(10),VHDSSLON nvarchar(10),VHDISSLRK nvarchar(10),VHPLAKA nvarchar(15),VHIDHVON nvarchar(3),VHIDHVRK nvarchar(3),TARIH nvarchar(10),USER nvarchar(5))" command4.ExecuteNonQuery() command4.Dispose() MsgBox("MUSTERI.SDF TAMAM") ' 4TH Creation Complete connection4.Close() "Enver A" <ea90@hotmail.com> wrote in message news:%23r8xTZhUEHA.2484@TK2MSFTNGP11.phx.gbl... > Hey ppl, > I am having trouble in building a smart device application. I cant create a > table on SQLCE server using this line. Anyone can tell me what the problem > is? > I am able to create another 3 Tables same way but this SQL line is always > gives me problems. > > > command4.CommandText = "CREATE TABLE MUSTERI (INDEXMS nvarchar(5),MSAD > nvarchar(30),MSSOYAD nvarchar(30),MSSEMT nvarchar(30),MSSEMTRCH > nvarchar(30),MSTLF nvarchar(15),FIYAT nvarchar(3),INDEXBY > nvarchar(4),VHMARKA nvarchar(30),VHMODEL nvarchar(50),VHLSEBAT > nvarchar(20),VHYIL nvarchar(4),LASONMRK nvarchar(20),LASONDSN > nvarchar(30),LASRKMRK nvarchar(20),LASRKDSN nvarchar(30),VHDSSGON > nvarchar(10),VHDSSGRK nvarchar(10),VHDSSLON nvarchar(10),VHDISSLRK > nvarchar(10),VHPLAKA nvarchar(15),VHIDHVON nvarchar(3),VHIDHVRK > nvarchar(3),TARIH nvarchar(10),USER nvarchar(5))" > > Tag: DataRowView.Row == Null??? Tag: 89980
  - 25
    - Create DataSet from ArrayList How can I create a dataset from an arraylist? I thought I could fill a dataset using an arraylist as the datasource but I can't find the way to do this? Wayne Tag: DataRowView.Row == Null??? Tag: 89976

Hi all,

I have noticed some weird behavior of the DataView. When I call
DataView[i].Delete() on a DataView it appears that the row is deleted. But
sometimes the DataRowView lives on, but the underlying DataRow is null.
Also, I handled the DataRowChanged event and inside of there I do a
GetChildRows() on that same table, but along with all the valid rows, a null
value is returned. It's as if the underlying DataTable still thinks the row
is there even though it is not.

I am changing the DataView.RowFilter inside of the RowChanged/RowDeleted
events. I think this is what is causing the problems. I change the filter
on the child view when the parent view updates its primary key and it
appears that this is what is causing the funky behavior. That's my best
guess. I have got around the problem by updating all my rows first and then
going through and doing the deletes separately.

Has anyone else experienced anything like this??

Cole

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