Setting The Database Connection When Using A TransactionScope?
Apr 26, 2010
Does the database connection have to be set inside a TransactionScope?
Or can I set it in the ctor and then have instance methods create up a TransactionScope?
EDIT: e.g.
Public Sub New()
Dim conn = new SqlConnection(...connection string)
Public Sub SomeClassMethod()
[Code].....
the question is do you need to create the connection to the database after you've created a TransactionScope or can it be done before?
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Dec 1, 2009
I'm trying to incorporate TransactionScope into my code and am failing at the first hurdle. I am unable to open a connection inside TransactionScope block. I get exception Connection Not Open.
Public Sub PerformDBWork()
Dim cnA As New OleDbConnection(My.Settings.DB_CONN_BUSINESS)
Try
cnA.Open()
[code].....
My cnA.Open() fires as expected but my call to cnBusinessDB.Open() fails.
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Oct 30, 2007
I have a simple Windows Service that reads from an Excel spreadsheet and imports the records into a SQL Server 2000 database table. Before it loads it checks if the file has been successfully imported before (using filename) and whether any of the records in the file have been imported before (using primary key). If these checks are ok I load the records into a datatable and then update the datatable to the database.
However, I need to do this in a transaction as I want to ignore the whole file if there is an error. The file goes to a discarded folder and the user gets an email with why the import failed. (This is likely to be because the store the record is for is not yet added to the database and the referential intergrity of the db fails). If there is no transaction the records before the failure record are imported. When the file is imported again (the store has been added to store table) the file is then rejected because duplicate records are already in the db.
Heres my code:
[CODE]...
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Jul 16, 2009
I'm having trouble setting up a connection to the DB.... When I go into VS 2008 on the left hand side (Server Explorer), I right click on the "Data Connections" option and select Add Connection and get the following error:
"The Microsoft.VisualStudio.Data.Interop.IVsDataProviderManager service could not be found."
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Aug 6, 2009
setting up a Ethernet connection using vb.net...
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Aug 7, 2010
I Downloaded MySQL Connector (the latest, 6.1.X), and i cant really understand how to use it in VB.Net... I Added it to references. All what I need to know is what imports to use, how to set connection with remote server and how do I select and insert to tables.
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Mar 11, 2010
I am a newbie in VB.NET I am using Sql Server Express 2005 as my database.I am currently working with my THESIS. A Human Reources Information System that concerns only with the file and record management of the employees. With two modules.a. Administrator for HR Manager (w/ installed vb.net and sqlserver express 2005)b. Staff for HR Clerk(w/ intalled vb.net)
Here is my problems:
1. I want to learn how to connect my vb.net application in each other using TCP/IP or any network connection tips.Scenario: If the client Save/Edit/Delete/ a record automatically it will saves on the admin sql database.
[Code]...
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Feb 5, 2010
Is there a way to display the connection properties dialog for connection string browsing(for database) in run time?
As I want the user to be able to connect to various database using the GUI.
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Aug 19, 2010
After running the following sub (VS debugger), I try to detach the database in SSMS, but it shows the connection open still and won't let me detach. If I close program in debugger, the database shows no connections. I check the dataadapter's connection in the finally block and is shows closed. What gives
Private Function ClientMasterDBFiles(ByVal MasterClientDBConnection As String, ByVal DBName As String) As DataTable
[Code]...
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Mar 5, 2011
I have a little problem with application setting in VB.net 2008. I want to switch main server and backup server connection string with combobox. [Code] It did change the Application Setting connection string in the main form when combobox1 was changed. But the problem comes, when child form was called. On the child form there is DataGridView with Dataset using application connection string. Even the Backupserver was selected on the main form, child form dataset connection string doesn't change. I don't know how to pass the current connection string to child form dataset although it is set to use application setting.
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Jan 21, 2011
I'm currently working on a legacy project in VB.NET 2.0.The project has a very funny DAL-layer which does not incorporate transactions :-|Anyway, it's my job to make some parts of the program transactional and I don'thave access to the DAL layer code.So I'm trying to put entire sections of code inside single TransactionScope.
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Oct 26, 2009
I have the following routine:
[code]...
Running this against both our production and test Oracle 11g database sporadically (or if there is a pattern, I haven't found it yet) generates the Oracle Error:ORA-02049: timeout: distributed transaction waiting for lock Since this is the only process running against the test database, there shouldn't be any issue with different users competing for a lock.
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May 1, 2010
I came accross TransactionScope as I try to resolve an issue bothering on the use of Transactions on Typed DataSets. But when I tried to implement it, my intellisence does not recognise it. I have to Import System. Transaction. TransactionScope but it is not recognised. How do I use it cos it seems like it holds some clues to my problem?Only performance counts!
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Nov 7, 2010
i am using access database for my program. now i have connected to the database in MDI form of main exe, and ir also works, user can log in, it gets verified etc etc etc. now here is the problem, when i load a form from dll and try to use any sql query on that form, i get message, "database connection is not opened". so what i did was, i added the connect() (a function i designed to connect to database) in the load part of the dll's form, it made the trick, query's started to run, everything went fine, and when i reload the form i.e after closing the form, i load it again from MDI form, i get error, connection already open..
[Code]....
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Nov 21, 2009
I have some VB.NET code that creates a TransactionScope instance:
LoggingUtility.LogDebug("UpdateCallTable", "SatComCallDataImporter", "About to associate call data with contracts")
Using ts = New TransactionScope()
LoggingUtility.LogDebug("UpdateCallTable", "SatComCallDataImporter", "Getting all unimported SatCom calls")
My application is throwing an exception on the call to the creation of a new TransactionScope, with "Object reference not set to an instance of an object.". The exception isn't thrown on my development machine or my test machine; only on the customers production machine, and I have no idea why. I've placed debug lines immediately before and after this line so I'm positive it is this line causing the problem.
A have used TransactionScopes throughout the application and this is the only place throwing the exception on the client machine."About to associate call data with contracts" gets written to the log and the next log entry is the "Object reference not set to an instance of an object".
Code works fine if I move it out of a transaction.I've been struggling with this for 4 days now and have got no closer.
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Mar 17, 2010
I'm encountering a hang when the program tries to access the fruit database. I've already enabled network access MSDTC on both my development computer and the SQL Server server.
[Code]...
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Jul 9, 2011
I use Microsoft ODBC For Oracle, and process a distributed transaction with ransactionScope, but, the code throws a error: ERROR [HYC00][ORACLE][ODBC]option not implement, my code is in vb.net.ere is my code:
sub Main()
dim strConn1 as string = "Driver={Microsoft ODBC for Oracle};Server=server1;UID=user1;PWD=pwd1;"
[code].....
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Jul 24, 2009
I have trouble using the transactionscope on SQLite, i am using the following code. Changes are still commited to the database while i don't call the ts.Complete() function.
Using ts As New System.Transactions.TransactionScope()
Using sharedConnectionScope As New SubSonic.SharedDbConnectionScope()
' Do your individual saves here'
[Code].....
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Jan 2, 2010
I'm using a OleDB connection to a access database. I'm entering a row into the database to set some user preferences. What i need to get is get back the row ID of the row I just entered. I'm more familiar with PHP and with PHP I use use this entry
[Code]...
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Jun 17, 2011
I am trying to copy a table in a database into another database on another connection in VB.NET, using OleDb. If they were on the same connection I would just use SELECT INTO, but they are not. I have two different OleDbConnection and cannot see an easy way to do this.
Right now I am attempting to just copy the database into a DataTable using an OleDbDataAdapter, and then loop through the DataTable and insert every record into the target database one at a time. This obviously takes a ton of time for the large DB I could potentially be dealing with, and I have to deal with escaping strings, null values, etc.
edit - just to make this more clear: I have two OleDbConnection objects, one is linked directly to a local .mdb file on my computer (JET). The other is linked to a database on our servers (SQLOLEDB). I am wanting to do this:
"SELECT * FROM fromDB INTO toDB"
But I can't because fromDB and toDB are on different connections, and the OleDbCommand object is only attached to one. The only way I can see how to do this is to connect to fromDB, copy it into a DataTable, connect to toDB, and copy all of the data in the DataTable row by row into toDB. I was wondering if there is an easier way to do this.
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Mar 11, 2010
i'm trying to set a password in my database using vb.net.here's my codes..
Private Sub btn_ok_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn_ok.Click
Dim chkpass As Integer
Dim strsql As String
[code]....
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Aug 13, 2009
I want to set a password to my database..I used DAO to access a database..It is MS-Access 7.0 Database..I searched lot of forums, but i found only with ADO..I tried this concept with DAO.. But i couldn't get.
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Oct 8, 2009
I want to insert text into an empty database.I create a database using Access and now I want to insert text1) first I Added the data source2) I drag and drop the Fields into the dialog Form3) using dataview I inserted the database onto the dialog form4) added a little bit of code...5) Built the program and the database shows nothing...do I need to make a Query or something...bind the source
Private Sub btnExit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnExit.Click
[Code]...
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Mar 11, 2010
I have created a project with my forms & a little bit of validation logic, the basic skeleton of the project looks just fine.The data that I have for the project is currently in 2 Excel spreadsheets, so I have created a database within my project (I chose a SQL option, even though I have only ever used Access in the past) & I now have Database1.sdf & MyFinancesDB.xsd in my Solution Explorer.
I have created 2 Tables, the same as the Spreadsheets & have created Columns as necessary, and also set up Primary keys in both Tables and linked the Primary key of the Parent Table to a keyed column in the Child Table ... I *think* I have done what I need to do.Now, the big question (assuming I have set things up correctly !) is how do I import / load the data from the Excel spreadsheets into the SQL Tables?
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Mar 5, 2012
I'm working on my own project management software and I'm having trouble linking the database with the interface and then coding it so that the components interact with the database. Can anyone refer me to a good tutorial. I tried the MSDN and found that to be a little too over my head.
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Jun 11, 2010
i have so far set up a form to save data into a database and i am using:
[Code]....
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Mar 11, 2010
i have so far set up a form to save data into a database and i am using:
con.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0.;" & _
"Data Source = F:Database1.mdb"
con.Open()
I tried saving the database as i did with images in the resource folder and used my.resources but this didnt work is there any way i can save the database into the project folder and link to it no matter whan machine i am on?
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Nov 12, 2010
I tired the following Query to access my SQL Server database. It returns an error. SELECT Name, Address, PhoneNo FROM dbo.tblContacts where name=?
[Code]....
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Jun 30, 2009
have a problem in setting hyperlink text property from database at runtime....Iam struggling to connect the database values to dynamic hyperlinks.
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May 18, 2009
I have an application that's going to be portable so it's likely the path of the database itself (access mdb file) will change so hard wiring the path in the app.config isn't practical. I would like to create a 'Settings' form for the user to enter the path (browse for would be ideal but I can figure that out later) of the database file and save it for future use with the same app. I've found a few things out there talking about creating a new app.config file alongside the original with a 'key' defined but I'm not sure how that relates to the original app.config and how it would call the new variable to make the connection.
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