Record Locking

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- Previous
  - 1
    - Can I use Query Builder from my application? Hi, Is there any way to use in my application Query Builder that Microsoft is using in SQL Server and DataAdapter Wizard where I can drag and drop tables, link them in graphical designer and run resulting sql statement? Is it possible or is it just part of SQL Server and VS? Thank you. Victor Tag: Record Locking Tag: 105234
  - 2
    - How to manager empty string to null? How do I manage empty string to null? Do I have to code like following? if(txtBoxFirstName.text == "") cmd.Parameters.Add("@FirstName",DBNull.Value): else cmd.Parameters.Add("@FirstName",txtBoxFirstName.text): Or are there better ways? Also, I am curious about how to manage for integer as well. Tag: Record Locking Tag: 105225
  - 3
    - what can cause a "object was open" error Hi, I am writing an ASP.NET appliction with C#. I also access a MSDE database with the OleDb Provider. I am using OleDb to have the option of easily changing the underlying database. That worked all well. But after some additions to my application I now have the following error: Exception: System.Data.OleDb.OleDbException Message: Object was open. at System.Data.OleDb.OleDbConnection.ProcessResults(Int32 hr) at System.Data.OleDb.OleDbConnection.InitializeProvider() at System.Data.OleDb.OleDbConnection.Open() This error does occur in some code snippets all the time, in some other it seems that it only happens sometimes. I tried to find out more about the error by investigating the problem in a code snippet where it always occurs. But it doesn't help. It is just an INSERT statement to one table. I already tried synchronizing the code snippet and commenting out all other accesses to the same table to avoid any collisions by multiple threads that try to access it, but it still doesn't work. The connection itself is closed, so "Object" must mean something else. But what? Any ideas? Regards Marco Tag: Record Locking Tag: 105224
  - 4
    - DataRowVersion - Strongly typed dataset If reviewing how to get the DataRowVersion data from a row in a dataset I see no example of how to do this with a strongly typed dataset using dot notation. Below I have an example of how I get a value into a integer value called OrigStatus not using dot notation. OrigStatus = CInt(Me.DataSetQuoteDetail1.quote(0)("quote_status_id", DataRowVersion.Original)) As you see, in the example above it is necessary for me to supply the name of the column in quotation marks. Is there a way to do this in a strongly typed dataset using dot notation so that I don't have to supply the column name in quotation marks? Tag: Record Locking Tag: 105223
  - 5
    - Binding to a bound grid Hi, This question is in relation to a System.Web.UI.DataGrid If I bind some data to a grid, then in a subsequent postback bind to it again, does the grid intrincially clear its contents before adding the new information. TIA Tag: Record Locking Tag: 105222
  - 6
    - DataAdapter newbie question I have two questions regarding the use of DataAdapters: 1. If I am going to retrieve multiple tales to a DataSet using multiple DataAdapter Fill's is it best to create a separate DataAdapter for each table or to create one and change it's SelectCommand property between each Fill? 2. Related to number 1, is it best to explicitly open the connection before the series of Fill's and close after rather than allow each DataAdapter to implicitly open and close the connection. TIA, John Tag: Record Locking Tag: 105221
  - 7
    - Comparing Dataset values with Strings I am creating a login screen wherein only certain users are granted permission. The names of those users,are copied into a dataset using dataadapter.Then the dataview is used. But the problem here is that the "Dv.Count" always evaluates ..to 0. Hence whenever I enter the valid names "Invalid User" is prompted on the screen I have writen the code below. OleDbDataAdapter dAdap1 = new OleDbDataAdapter("SELECT ..[EMPLOYEE ID] FROM EMPLOYEE;",con1); dAdap1.Fill(DtSet); Dv.Table=DtSet.Tables["EMPLOYEE"]; Dv.RowFilter.CompareTo(txtLogin.Text); if(Dv.Count==0) { txtLogin.Text="Invalid User"; } Kindly suggest, Tag: Record Locking Tag: 105217
  - 8
    - Binding Data with TextBox I want add a new record using a text box, but when I click the new button it should clear the text of textbox and textbox should be binded to datasource. pls help! Tag: Record Locking Tag: 105216
  - 9
    - Insert data from a Dataset into a SQL Database Hi guys my name is Ralph, i am kinda new to this so please bear with me. I have written a .net web service which accepts a stream of data see relevent source code). Public Function PutBondInfo(ByVal data As String) As DataSet Try Dim zh As New ZipHelper Dim sz As String Dim cn As SqlConnection Dim da As SqlDataAdapter Dim ds As New DataSet Dim xSet As New DataSet Dim sSql As String Dim mySerializer As XmlSerializer = New XmlSerializer(ds.GetType()) cn = New SqlConnection("server=HLSQL;uid=test;pwd=;database=test") cn.Open() da = New SqlDataAdapter("SELECT * FROM BondStatus", cn) 'da.TableMappings.Add("BondStatus", "NewDataSet") sz = zh.Decompress(data) zh = Nothing da.FillSchema(ds, SchemaType.Mapped, "BondStatus") 'da.MissingSchemaAction = MissingSchemaAction.AddWithKey da.Fill(ds, "BondStatus") Dim st As New MemoryStream(Encoding.UTF8.GetBytes(sz)) ' Create the object from the xml file xSet = CType(mySerializer.Deserialize(st), DataSet) xSet.Tables(0).TableName = ds.Tables(0).TableName ds.Merge(xSet, False, System.Data.MissingSchemaAction.Add) 'ds.AcceptChanges() Dim SqlCB As SqlCommandBuilder = New SqlCommandBuilder(da) da.Update(ds, "BondStatus") st.Close() da.Dispose() SqlCB.Dispose() cn.Close() Return ds Catch ex As Exception ex.Message().ToString() End Try End Function This data is compressed.I decompress the data and receive the xml which is then deserialized into a dataset. this part works great no problems. My problem is then taking that dataset and pushing the data into a table on my SQL server. The elements in the xml and the field names of my SQL table 'BondStatus' are exactly the same. The table names are different the xml has 'Table' as its table name and so on. As you can see from the code I have tried table mappings, assigns, merges etc with no luck. Ladies and gents if anyone has a clue as to what I am doing and can help me, it would be appreciated. Thanks in advance Ralph Tag: Record Locking Tag: 105211
  - 10
    - Stored Procedure Hi, I've 2 stored procedures in Sql Server 2000 by name QA_User_Insert and QA_Insert_Candidate. Am using Oledb connection to connect to Sql server 2000. and i wrote following code in ASP.Net Dim MyConn As OleDbConnection = New OleDbConnection("uid=sa;Intial Catelog=Quiz;data source=server;pwd=thanks;provider=SQLOLEDB.1") Dim cmd As New OleDbCommand cmd.Connection = MyConn cmd.CommandType = CommandType.StoredProcedure cmd.CommandText = "QA_User_Insert" \\ Here i created paramentes and added to parameters collection of cmd object. \\ cmd.ExecuteNonQuery() then after running the application am getting Error "Can Not Found Stored Procedure QA_User_Insert" I 've checked sql server 2000 and i found that there is QA_User_Insert stored Procedure. why am getting this error ? plz can anybody tell me solution for this problem. Thanx in advance Jyothi Tag: Record Locking Tag: 105205
  - 11
    - sqlexception error in system.data.sqlclient.dll Hi everyone, i'm a newbie to VB.NET programming and i need help here. I'm current doing an application for pocket pc and i get this sqlexception error when i try to retrieve stuff from the database. My guess is that the error lies with the connection string. I've tried serveral different connection string but i still get the error. Try cn = New System.Data.SqlClient.SqlConnection("DATA SOURCE=L311C007; Initial Catalog=HEALTHCARE; Integrated Security=SSPI;") cn.Open() cmd.CommandText = "SELECT * FROM PERSON" cmd.Connection = cn Catch ex As System.Data.SqlClient.SqlException result = "There was an SqlException.." & vbCrLf & "Details..." & vbCrLf & ex.ToString() MsgBox(result) End Try The connection strings that i have tried are: User id=sa;password=;database=HEALTHCARE;server=L311C007 Data Source=L311C007,14433;Initial Catalog=HealthCare;User id=sa;password=; Tag: Record Locking Tag: 105204
  - 12
    - AdoHelper Dependency Problem Hi I'm using the GotDotNet.ApplicationBlocks.Data.AdoHelper class in one of my projects, and it's working fine on my development machine. the problem however arises when deploying the project to another machine. I get a FileNotFoundException in the type initializer of AdoHelper. It claims it can't find a dependency, although inspection of the AdoHelper source code seems to show that it doesn't depend on anything other than the .Net Framework. The specific line of code which fails is this: Additionally the stack trace shows that the error occurs within a System.Reflection class. AdoHelper adoHelper = AdoHelper.CreateHelper("GotDotNet.ApplicationBlocks.Data","GotDotNet.ApplicationBlocks.Data.SqlServer"); Interestingly it seems to work fine if I create the SqlServer helper directly. Anyone got any thoughts? Cheers Andrew Tag: Record Locking Tag: 105194
  - 13
    - Cannot Delete Rows in Database Hi all, I am using the following to remove a row from a DataSet: myDataSet.Tables["Table1"].Rows.RemoveAt(indexSelected); followed by; myDataAdapter.Update(myDataSet); After this call, looking in the database, the row is not deleted. But debugging it I can see it remove the row. Also note that the following insert does insert into the database: myDataSet.Tables["Table1"].Rows.InsertAt(newRow, index); Strange how InsertAt works but not RemoveAt. Does anyone knows what the problem is???? Thanks for any help, Scott Tag: Record Locking Tag: 105193
  - 14
    - This sqlTransaction has completed; it is no longer usable This issue is really frustating because it happens randomnly. This is the sample layout of my code. try { SQLConnection.Open(); trans = SQLConnection.BeginTransaction(); //Insert the data into tables using datasets trans.Commit(); } Catch (SqlException ex) { Console.WriteLine(ex.Message); trans.Rollback(); } Randomnly I get the error "This sqlTransaction has completed; it is no longer usable". This error occurs when it tried to execute "trans.Commit();" Anyone has any suggestions? Thanks Tag: Record Locking Tag: 105192
  - 15
    - I want to execute a simple UPDATE command! I am pretty new to .NET, so can someone tell me why this doesn't work? It does not throw any exception but it doesn't update the record in the table either. All variables are populated correctly and the record DOES exist! Thanks in advance! SqlConnection loConnection = new SqlConnection(<connection string here>); SqlCommand loCommand = loConnection.CreateCommand(); loCommand.CommandText = "UPDATE NewUser SET Name = '" + lsName + "' WHERE NewUserID = " + liNewUserID; loConnection.Open(); SqlDataReader loDataReader = loCommand.ExecuteReader(); loDataReader.Read(); loDataReader.Close(); loConnection.Close(); Tag: Record Locking Tag: 105189
  - 16
    - Is it bad to use transactions for read operations (keeps conn. ope Hi I am trying to find out if it is bad, and how bad, to start a database transaction on a set of read operations. By starting a transaction I can keep open the database connection...but is there significant overhead for transaction? Basically I am populating a set of objects and I may hit the database 5 to 10 times on any given set of parent/child objects. I cannot use stored procedures. What do you think? Tag: Record Locking Tag: 105187
  - 17
    - updating a decimal Hallo, could you help with this problem? Updating an integer, as tring ok, but a decimal ?? Update tblprice Set article = ' " & this & " ' WHERE ... what signs do I have to put? Thx for helping me Hyphessobrycon Tag: Record Locking Tag: 105186
  - 18
    - Switch Columns And Rows Hi, I wander if it's possible to retrieve a recordset but switch rows and columns I've a table with the fields ar_id, cr_id, ar_st the table is filled with the folowing records [1], [01], 0 [1], [02], 1 [1], [03], 1 [2], [02], 0 [2], [03], 1 I want to transform this somehow into [1], [01], 0, [02], 1, [03], 1 [2], [02], 0, [03], 1 Is this possible via sql or ado.net? Kind Regards Tag: Record Locking Tag: 105184
  - 19
    - Reading a dataset into XML I have a table in my SQL Server that I am loading into a datatable. I am then saving the dataset that this table is a member of (it's the only table in the dataset) to an XML file so that I can use it offline in another part of my program. The code I use for this is: ds.WriteXML("c:\clients.xml") 'DS is my dataset object This generates an XML file like the following (the entire XML file is included in this post at the end of the message) <?xml version="1.0" standalone="yes"?> <ClientData> <Clients> <c_recordid>1</c_recordid> <c_name>NOL</c_name> </Clients> <Clients> <c_recordid>2</c_recordid> <c_name>TCG</c_name> </Clients> .more clients. </ClientData> In another part of my program, which is designed to use when you're offline and can't connect to the SQL server, I want to reload this information back into a datatable. I do so using the following code: ds = New DataSet("ClientData") ds.ReadXml("c:\clients.xml") dt = ds.Tables("Clients") Next, I try to refer to a specific row in the Clients data table in the following manner: Dim rows as datarow() = dt.select("c_recordid=" + clientid.tostring) 'ClientID is an integer being passed to the subroutine Try Dim row as datarow = rows(0) Catch ex as Exception Msgbox ex.tostring End Try Because c_recordid is the unique key for the table, I know that only one row will be returned - hence I can logically refer to row(0). However, when I call the subroutine setting the ClientID variable to 2,3.10, or 11, I get the following exception when referring trying to access rows(0): System.IndexOutOfRangeException: Index was outside the bounds of the array. This does not happen when I set ClientID = 1,4,5,6,7,8, or 9. I know all of these are valid because I've looked at the XML file in it's entirety. I've checked for strange characters that might be messing it up and haven't found anything - all in all, I thought it would be an easy process, but the only thing that is consistent is the ClientID's I can't access. Can anyone direct me to what I'm doing wrong, or what might be causing this thing to blow up? I'd appreciate any help. One last thing. I HAVE written a little subroutine to loop through each row in the datatable. Dim r as datarow For each r in dt.rows Msgbox r(0) 'Msgbox's the clientid column (1-11) Next r This works fine. I see all 11 clients when I loop through them, but cannot use the .select method to consistently get a particular one. Thanks, Chet Here is the XML file in it's entirety: <?xml version="1.0" standalone="yes"?> <ClientData> <Clients> <c_recordid>1</c_recordid> <c_name>NOL</c_name> </Clients> <Clients> <c_recordid>2</c_recordid> <c_name>TCG</c_name> </Clients> <Clients> <c_recordid>3</c_recordid> <c_name>CHN</c_name> </Clients> <Clients> <c_recordid>4</c_recordid> <c_name>CNT</c_name> </Clients> <Clients> <c_recordid>5</c_recordid> <c_name>CityNet</c_name> </Clients> <Clients> <c_recordid>6</c_recordid> <c_name>IFN</c_name> </Clients> <Clients> <c_recordid>7</c_recordid> <c_name>IU</c_name> </Clients> <Clients> <c_recordid>8</c_recordid> <c_name>Lilly</c_name> </Clients> <Clients> <c_recordid>9</c_recordid> <c_name>Plainfield</c_name> </Clients> <Clients> <c_recordid>10</c_recordid> <c_name>St. Vincent</c_name> </Clients> <Clients> <c_recordid>11</c_recordid> <c_name>IFW</c_name> </Clients> </ClientData> Tag: Record Locking Tag: 105180
  - 20
    - Values being formatted differently when opening spreadsheet using ado.net I have a some-what simple app for importing data from excel to our database. The app is written in C# and uses ado.net. When I open the xls file, it displays in a grid to show the values. The problem is values are formatted differently depending on the machine. I have 2 machines. One the first one (excel installed) I open the xls file and all values display as decimal even though in excel there displayed as percents. This is fine and how I want it. On the second machine (excel not installed) the values display as percents. What can cause the difference in formatting? Thanks, Joe Tag: Record Locking Tag: 105179
  - 21
    - How to display different data Here is what I'm trying to do, I have a database table with columns: ColA ColB ColC ColD ColE 1 AAA BBB xxx yyy x 2 111 xxx 222 yyy y ... I want to display in a web form ColA, ColB if the ColE of the row I'm getting having value "x", display ColA, ColC if ColE="y". So if user searches for row 1: ColA AAA ColB BBB if user searches for row 2 ColA 111 ColC 222 ColD yyy What is the best way to make it work? Do I need to have different data controls and display one of them depending on the data returned (my real problem will consist of quite a few cases)? (Is there a way of displaying the data at the run time?) This just seems to be someting that is easy accomplished in ASP but I don't know how to do it in aspx. Give me some example code will really help. TIA. Tag: Record Locking Tag: 105175
  - 22
    - Concurrency Violation Help I have a dataset that contains 2 datatables. When I change a record and try the update command it gives me this error... Concurrency violation: the UpdateCommand affected 0 records. at System.Data.Common.DbDataAdapter.Update(DataRow[] dataRows, DataTableMapping tableMapping) at System.Data.Common.DbDataAdapter.Update(DataTable dataTable) Here is the code: SqlConnection con = new SqlConnection(strCon) ; try { con.Open() ; daAllSigns = new SqlDataAdapter(sqlAllSigns,con) ; SqlCommandBuilder cb = new SqlCommandBuilder(daAllSigns) ; daAllSigns.Fill(dsGrids,"AllSigns") ; daQueSigns = new SqlDataAdapter(QueSigns,con) ; daQueSigns.Fill(dsGrids,"QueSigns") ; // Change record dsGrids.Tables["AllSigns"].Rows[3]["Sign_Brand"] = "TEST BRAND" ; dsGrids.Tables["AllSigns"].Rows[3]["Sign_SignDesc"] = "TEST DESC" ; daAllSigns.Update(dsGrids.Tables["AllSigns"]) ; catch(Exception exc) { Debug.WriteLine(exc.Message + " " + exc.StackTrace) ; } Does anyone know why this error could be coming up, the code seems pretty straight forward to me.... Tag: Record Locking Tag: 105167
  - 23
    - getting return values from stored procedures I need to get a return value from the procedure that follows. For some reason I am not able to asign a value to @returnval and get it back to the C# code executing it. The procedure does not return any errors. Here is the code: ALTER PROCEDURE gradeTest2 @empid int, @testid int AS set nocount on declare @returnval int set @returnval=1 declare @correct int declare reader cursor fast_forward for select answercorrect from questionsanswered where (empid=@empid) and (testid=@testid) open reader fetch next from reader into @correct while @@Fetch_Status=0 begin if @correct=0 set @returnval=0 fetch next from reader into @correct end close reader deallocate reader begin if @returnval=1 if not exists (select testid from testresults where (empid=@empid) and (testid=@testid)) insert into testresults (testid,empid,results,testdate) values (@testid,@empid,@returnval,getdate()) else update testresults set results=@returnval,testdate=getdate() where (empid=@empid) and (testid=@testid) if @returnval=1 delete from questionsanswered where (empid=@empid) and (testid=@testid) return @returnval end *** Sent via Developersdex http://www.developersdex.com *** Don't just participate in USENET...get rewarded for it! Tag: Record Locking Tag: 105164
  - 24
    - SQLClient Exception - Retrying Upon executing a stored procedure using the Data Access application block's SQLHelper class, I would like to continually retry to execute it every 1 second up to 3 times if an exception occurs. For example, if for some reason the database server is down, a timeout occurs, etc. I would like to automatically retry a certain number of times before giving up. What is the best way to accomplish this? Below is what I envision (pseudo-code): Dim Retries As Integer = 0 Dim Try '// execute database command here SQLHelper.ExecuteNonQuery(...) Catch ex AS SQLException If Retries <= 3 Then Sleep(1000) SQLHelper.ExecuteNonQuery(...) End If End Try The problem I have with the code above is that I have duplicate code (SQLHelper.ExecuteNonQuery(...)). The other problem I have, is what happens when an exception occurs in the Catch block? Any help would be greatly appreciated. Thanks, Shawn Tag: Record Locking Tag: 105161
  - 25
    - too much for stored procedure execution Hi, I'm trying to write efficient C# code to execute a stored procedure. The stored procedure takes in 5 arguments. I'm doing a foreach loop to write a lot, and I mean a lot of data to the DB. Is the following the most efficient and best way to write tons and tons of data into the DB using a stored procedure that required 5 arguments? Remember the code below is called numerous times. foreach (MyClass obj in CollectionOfObjects) { try { SqlCommand cmd = new SqlCommand("MyStoredProcedure",sqlcon); cmd.CommandType = CommandType.StoredProcedure; SqlParameter param; param = cmd.Parameters.Add("@first_name", SqlDbType.VarChar); param.Value = obj.first_name; param = cmd.Parameters.Add("@last_name", SqlDbType.VarChar); param.Value = obj.last_name; param = cmd.Parameters.Add("@a", SqlDbType.Int); param.Value = obj.a; param = cmd.Parameters.Add("@b", SqlDbType.Int); param.Value = obj.b; param = cmd.Parameters.Add("@c", SqlDbType.Int); param.Value = obj.c; cmd.ExecuteNonQuery(); } catch {} } Thanks Tag: Record Locking Tag: 105159
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  - 1
    - Patterns And Practices [Copied from microsoft.public.dotnet.languages.csharp, no answer up to now and probably was wrong group anyways] I downloaded the patterns and practices enterprise library and found that it is much different for the Data library that I am used to (SqlHelper)..It's not just an update but a total rewrite. Anywho, figured out how to get it to work which wasn't too hard. What I haven't found and am having trouble with is updating and inserting into a database. In the SqlHelper library, there were methods such as ExecuteScalarTypedParams and such which allowed all parameters to be inside a dataset and you just passed the dataset. This was great because all of our data access routines returned a dataset. We would just modify the data and pass this same dataset/table/row back to the SqlHelper method and it would get updated using our stored procedures in Sql Server. Now, afaik, there are no methods which take a dataset for parameters. I have to manually created the parameters, one by one and then add them to the collection. Is there a better way, maybe they do exist but I haven't seen them? Anywho, I could always write a method in my applications that would take a dataset and build the parameters based on column name, column data type, and compare vs the stored procedures, but if it already exists, I don't want to reinvent the wheel. Thanks in advance, Mythran Tag: Record Locking Tag: 105152
  - 2
    - Unknown Query Engine Error Forgive me if this is the wrong forum for this question, but I'm not really sure where I should ask it. I am using Crystal Reports to produce a report against a SQLServer database. Up until 2 weeks ago, the report worked fine. No event was noticed that might explain why the report stopped working, but now running it produces an error "Unknown Query Engine Error". The datasource is a stored procedure joined to a view and 2 tables. I don't know the EXACT connection string that Crystal Reports is generating, but it would be you should be able to get the idea from this: SELECT vwCurrentFacilityInfo.FacilityName, tblItem.DecalNumber, tblPerson.LastName FROM dbo.spPropertyTagLetterItems() LEFT OUTER JOIN dbo.tblItem ON dbo.spPropertyTagLetterItems.ItemID = dbo.tblItem.ItemID LEFT OUTER JOIN dbo.vwCurrentFacilityInfo ON dbo.spPropertyTagLetterItems.ParentID = dbo.vwCurrentFacilityInfo.FDEPFacilityID LEFT OUTER JOIN dbo.tblPerson ON dbo.vwCurrentFacilityInfo.SiteManagerID = dbo.tblPerson.PersonnelID As I said, this worked until 2 weeks ago, and STILL works if I try generate the report against the a copy of the database residing on a different server ((local) on my development machine). Any ideas? Thanks, Pat Tag: Record Locking Tag: 105151
  - 3
    - store rtf in C# How I can store rtf format in SQL Server. (C#) Tag: Record Locking Tag: 105147
  - 4
    - OleDbDataAdapter.Fill Error ("The provider could not determine the Object value) ADODB.Recordset Hi, I am trying to fill a DataSet using an ADODB.recordset: OleDBDataAdapter.Fill(DataSet, Recordset, "Table1") This works fine in most part but on other occasions I get the error below: "The provider could not determine the Object value. For example, the row was just created, the default for the Object column was not available, and the consumer had not yet set a new Object value." This seems to be a data issue, as when the recordset is empty then no error occurs but the the fields are correct in the DataSet. What does this error mean and are there any ways around it? Help is appreciated, Leroy. Tag: Record Locking Tag: 105143
  - 5
    - Using apostrophe in DataTable.Select() Hi, I'm using the dataTable.Select() method in my code. This is my code: dft.Tables[0].Select("fieldName='" + @fieldName + "'") ; This works fine until there is an apostrophe in the fieldName variable - then i get error message: "Syntax error: Missing operand after ...". How can i use queries with apostrophe inside? Thanks. Tag: Record Locking Tag: 105132
  - 6
    - Big Problem Hi, Hi testing the Visual Studio 2005 Beta 2, i'm developed one application and save this project, when close the visual studio and reopen in another time with the application i produce this error OBJECT REFERENCE NOT SET TO AN INSTANCE OF AND OBJECT LINE 0 COLUMN 0 And not is possible open the project Thanks in advance Euclides Tag: Record Locking Tag: 105130
  - 7
    - single large vs multiple small SP calls - speed + efficiency I have a collection of objects (eg Forms) , each of which contains another collection (eg Controls). When I come to fill the Control collections at startup, I fill each one in turn using a Form.GetControls(FormID) call. This puts the call where I think it is best placed (In the Form class), but am unsure about the efficiency of it. Would I be better off making one "global" call, retuning all the Controls and then filling each of the Form.Controls collections. I know I could probably test it somehow, but does anyone know what the best way to do it would be? Ideas welcome. Thanks Tag: Record Locking Tag: 105129
  - 8
    - Exception raised by the DataAdapter Configuration Wizard Hi, For a few days now, I've been unable to complete the Sql/OleDataAdpater = conf wizard on VS .NET 2003 Architect. The message is : "the object = reference is not defined on an object instance". Exception is raised by = function = Microsoft.VSDesigner.Data.VS.VsConnectionManager.CheckConnection(Int32 = index, ProviderNameInfo)... Any hint ? Oriane Tag: Record Locking Tag: 105123
  - 9
    - DataSet with multiple relations to Hi! I'm using a typed dataset where I have a common address table which is related to several other tables in the dataset, see below: Table Incident: - PK - FK_incidentAddress - relation to Address.PK - FK_destinationAddress - relation to Address.PK ... Table Person: - PK - FK_homeAddress - relation to Address.PK ... Common table Address - PK - Street - City .... If I use one Address entity in the dataset, I guess that I'll get problems as one row in Address can not satisfy all the relations specified. If I instead create multiple Addresses which I give different names, and the relate each of them to their parent, I get ConstraintExceptions when trying to enable constraints in the dataset after merging the child rows. It seems like it is the rename of a Address table that creates my problem. Any tips? Brgds Jonas Tag: Record Locking Tag: 105122
  - 10
    - Access Security Issue I get the following error message when I attempt to called query which resides in my Access DB (Stored procedure), "Operation must use an updateable query". I looked at the KB article which addresses this error and it indicates that I need to change the security on the folder and the file which contains my access Db. I went into the folder and and the file and change the "IUSR" account to "Full access". But this did not resolve the issue. When I look at the file permissions of the directory, I see the "Deny" greyed out but checked for "Special Permissions" and "Write". the "Special Permissions" is not checked for "Allow" and it is checked for "Special Permissions". Is this the way it is suppose to be? Any ideas as to what else I should look at so that I can do an update on the Access DB? Thanks in advance for your assistance!!! Tag: Record Locking Tag: 105113
  - 11
    - constraint message box Hi, I have a dataset containing constraints. (not null, and size constraints on table columns). When the constraint is violated, a message box appears showing the constraint violation. Is there any way to catch these constraint violations WITHOUT doing one of the following: 1) disabling the constraints and manually checking - because what is the point of that? If I wanted manual checks I wouldn't bother with fillschema or specifying the constraints at all. 2) installing a thread exception handler and parsing the exception message, because different database languages and collation orders will break it, not to mention foreign windows versions (A requirement in our case). Is there any way of handling these constraints, I am even happy to inherit and override the dataset. What method in the dataset actually pops up this rediculous message without providing a developer hook to customise or handle the error? Surely the clever boys at Microsoft did not just write code to pop up a message without thinking that we might have other plans for the error message. Regards Craig Tag: Record Locking Tag: 105111
  - 12
    - OleDb Namespace I have one web project in which I have OleDb Namespce listed with intellisence and in other projects my variables have to be declared using the entire namespace (i.e. System.Data.OleDb.OleDbConnection). All projects have sytem.data.dll reference. I just can't figure out what I have done to make the OleDb namespace readily available in the one project? I'd like to do it for all. Tag: Record Locking Tag: 105104
  - 13
    - dr.Read() Hello Everyone: I have a feeling this is very basic, and something I am just overlooking. The dr.Read() ALWAYS is being translated to false in the code below. I print out the sSQL statement using the watch window, and paste that into Query Analyzer: and I confirm the data does indeed exist. What am I missing? Why, regardless of the data, does my dr.Read() alway equal false? ----------------------------------------------------------------------------------------------- CODE SNIPPE ----------------------------------------------------------------------------------------------- sSQL = "SELECT i_OrderID FROM tOrder WHERE sPOrder = " + sPONumber; SqlConnection oConn = new SqlConnection(connStr()); SqlCommand oCommand = new SqlCommand(sSQL, oConn); oConn.Open(); SqlDataReader dr = oCommand.ExecuteReader(); if(dr.Read()) { ...Code Removed } else { ...Code Removed } Tag: Record Locking Tag: 105091
  - 14
    - DataSet object not releasing memory Hi, I'm encountering a strange phenomenon whereby a DataSet object is not releasing its memory when it's being disposed and/or set to Nothing. It is part of a Windows service written in VB.NET which fetches data out of a mySQL database, interrogates each row individually and takes various actions accordingly. It can fetch upwards of 300,000 rows, each of which vary between 1k and 2k in size, making the resulting DataSet object almost 500Mb in size. This in itself is not much of a problem, except that when the service has finished working with the DataSet, it does not release the memory it has been using. I'm using it in what appears to me at least to be a fairly standard way (code at the end of this post). What do I have to do to free up the memory allocated to the DataSet object? I've even tried running System.GC.Collect(), though that expectedly made no difference. Any assistance gratefully received. Mark Rae Option Explicit On Option Strict On Imports CoreLab.MySql Imports System.Collections Imports System.Data Imports System.Xml Public Function Import(pstrMySQLConnectString As String, pstrSQL As String) As Boolean Dim objMySQL As New CMySQLCoreLab(pstrMySQLConnectString) Dim objMySQLDS As DataSet objMySQLDS = objMySQL.GetDataSet(pstrSQL) For Each objRow As DataRow in objMySQLDS.Tables(0).Rows ' ' do the processing ' Next objMySQLDS.Dispose objMySQLDS = Nothing objMySQL.Dispose objMySQL = Nothing End Function Tag: Record Locking Tag: 105090
  - 15
    - Changes in a DataGrid don't always take Why is it when a new row is added in the datagrid and the user clicks a save button that GetChanges() returns null unless they move to another record first? Tag: Record Locking Tag: 105088
  - 16
    - MS Access DB structure I need to find out the structure of MS Access database; tables, queries and so on. How can I do that? Direction or sample code would work. Thanks to everyone in advance. Tag: Record Locking Tag: 105083
  - 17
    - AutoCommit - Oracle. If you call a stored procedure which is an update procedure, is it autocommitted by default? Is the same true for an Oracle Stored procedure? If you call an Oracle Stored procedure with the defaults for the connection, and the stored procedure has a rollback, I am getting an error which indicates that I can not do a rollback on a distributed transaction. How can I call a stored Oracle Procedure and be able to issue a rollback within the stored procedure without getting and error in ADO.Net when I do this? Tag: Record Locking Tag: 105076
  - 18
    - Cant connect to local sql server 2000 from VB.NET running WinXP Pro SP2 Hi I just installed SQL Server 2000 to run locally on a WinXP Pro SP2 PC. When I run the following VB.NET code: Protected Const SQL_CONNECTION_STRING As String = _ "Server=localhost;" & _ "DataBase=Northwind;" & _ "Integrated Security=SSPI" Dim connectionString As String = SQL_CONNECTION_STRING Dim cnnNW As New SqlConnection(connectionString) I can't connect to sql server. This code works fine on a Windows 2000 Pro SP2 pc. Thanks. Dee Tag: Record Locking Tag: 105075
  - 19
    - Remote connection to access database Is it possible to connect remotely to access database? If is, how? Any idea is appricited. Tag: Record Locking Tag: 105044
  - 20
    - Retrieving data from dataset with multiple tables Hi! Having problems with retrieving data from MS Access through a dataset with multiple tables. It works fine when I'm only using two tables in the dataset, but when I want to access data through a second table (three tables in all) it doesn't work! This is the error message I get: "An unhandled exception of type 'System.Data.OleDb.OleDbException' occurred in system.data.dll Please help Posted Via Usenet.com Premium Usenet Newsgroup Services ---------------------------------------------------------- ** SPEED ** RETENTION ** COMPLETION ** ANONYMITY ** ---------------------------------------------------------- http://www.usenet.com Tag: Record Locking Tag: 105040
  - 21
    - renaming a access table in ado .net hi, i need to rename a table in a access database, within ado .net. is that doable with a ExecuteNonQuery sql command applied to a OleDbConnection, if so what would the command be, i can't find any documentation for it? is it done thru a SchemaTable? what then would be code. i tried SchemaTable.Rows(RowCount)!TABLE_NAME = "tblNewName", but it is read only. thanks for any help ray Tag: Record Locking Tag: 105038
  - 22
    - Auto Number Seed ? How can I reset or change the value of autonumber in MS Access ? Doesn't it have the function like NEXTVAL or CURVAL as in Oracle ? Or is autonumber field more rigid ? Or is it possible to make sequence in Access so I can manually do it ? Tag: Record Locking Tag: 105032
  - 23
    - Enterprise Library, DataSets, and Windows Forms binding. Okay so I'm using the Data Access application block in the Enterprise Library. I'm using it to return a DataSet from an SQL Server (well, MSDE) stored procedure. So that's an untyped DataSet. I have no access to the DataAdapter used to retrieve the DataSet (the Enterprise Library classes don't expose it AFAIK), so I can't create any TableMappings. I want to bind the DataSet to Windows Forms controls, but I'm getting the old 'cannot create child list' errors because there's no schema attached to the DataSet. I can manually name tables and columns in the DataSet via the Tables collection, and then bind. This is messy though, so: 1) Is that the only way to do it? 2) If I retrieve the DataSet, then use WriteXMLSchema, can I subsequently use that saved schema against the returned DataSet? 3) This must be a very common thing that people need to do - why is is such a pain in ADO.NET? Tag: Record Locking Tag: 105031
  - 24
    - Default value of a Table in Sql server To default value in DataSet scheme hello I wanted to ask how to get the default value defined in the DataBase, to be defined as the default value in the DS scheme? and if there isn't a way, how else can i do that? thanks. Tag: Record Locking Tag: 105030
  - 25
    - Oracle and ASP.NET I have a Solution with 3 projects: 1- Data Access: A library with all class to acces to the DataBase 2- A Windows Forms Project that uses the library 1 to view data from the Data Base. 3- A ASP.NET project like the windows project. The problem is that the project 2 works but not he 3. In the ASP.NET project show this error: ORA-12154: TNS:no se ha podido resolver el nombre de servicio It can't be a problem with the Connection String neither the TNSNames because the windows project works. The Oracle directory allow Execute, Read and list to the users ASPNET, IWAM and IUSR Sorry for my English and many thanks Tag: Record Locking Tag: 105023

I was going to start a project in VB.net using ADO.net to a FoxPro database.
Foxpro has a RLOCK function that allows you to lock a record while you are
editing it. How can I achieve this with ADO.net??

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Re: Record Locking by William

William
Wed Feb 16 14:14:04 CST 2005

Start a Transaction with the repeatable read attibute. I have an article
about this on my site (one of the Doing the Impossible articles). See
www.betav.com/articles.htm

--
____________________________________
William (Bill) Vaughn
Author, Mentor, Consultant
Microsoft MVP
www.betav.com
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.
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"Altman" <NotGiven@SickOfSpam.com> wrote in message
news:e9fed%23EFFHA.208@TK2MSFTNGP12.phx.gbl...
>I was going to start a project in VB.net using ADO.net to a FoxPro
>database. Foxpro has a RLOCK function that allows you to lock a record
>while you are editing it. How can I achieve this with ADO.net??
>

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