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.
View 1 RepliesI'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.
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.
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!
View 5 RepliesI 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.
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]...
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].....
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?
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].....
I tried to create an insert sql query using a vb.net script and for some reason im getting an error message "sqlexception was unhandled"
Here is the screenshot
and here is my entire vb.net script
[code....]
I am connecting to a vendor-supplied Web Service running in our domain and am attempting to execute one of its methods. I am receiving the error below (Timeout Expired) and not sure how to fix it. The server is running SQL Server 2000 (soon to be upgraded!) and I have checked the timeout setting which is set to 0 (unlimited)
View 4 RepliesI just got this error while creating my own login form. It generates an error "Invalid Column name manoyanx" where 'manoyanx' is the string i am querying in the database. Here is my snippet :
Dim connetionString As String
Dim cnn As SqlConnection
Dim mycomm As SqlCommand = New SqlCommand
Dim dr As SqlClient.SqlDataReader
[code].....
the highlighted line of the code is dr = mycomm.ExecuteReader
i just tried one simple program using database about adding user to the table. And when I executed, it showed me this error:
Quote:Cannot open database "LoginSystem" requested by the login. The login failed. Login failed for user 'Lex-PCLex'.LoginSystem is name of the table
[code]...
Currently working with converting SQLException error messages into messages that are more useful for the end user. My largest issue has been finding the information I'm looking for.For instance, error code 8114 is
"Error converting data type [Type1] to [Type2]" And error code 8152 is "String or binary data would be truncated"
Using ADO.NET in VB.NET with SQLServer, is there a simple way to figure out which columns are affected by these errors?
I'm trying to store a data from the checkbox. when i checked on NSO Birth Certificate it has to be stored into my mssql server.here is my code
If nso.Checked = True Then
strsql = "insert into student info(Requirements) values ('" & nso.Checked & "')"
Dim sqlcmd As New SqlClient.SqlCommand 'opens the db
[code].....
This is frustrating, I am just trying to get the system to open a database and I get this error:
A first chance exception of type 'System.Data.SqlClient.SqlException' occurred in System.Data.dll
here's the entire code of the main form
[code].....
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]...
I want to backup my database using Linq to SQL:
Dim sql As String = "BACKUP DATABASE SeaCowDatabase TO DISK = _
'" + sfd.FileName + "'"
db.ExecuteCommand(sql)
[code].....
This may or may not need to be moved to the deployment folder...Okay I have a vb.Net application that connections to a sql server 2005 database "TacticalDB" while debugging the application I was using the connection string,
Dim con As SqlConnection = New SqlConnection("Data Source=.SQLEXPRESS; AttachDbFilename=" + Application.StartupPath + "DataTacticalDB.mdf; Database=TacticalDB; Trusted_Connection=True; User Instance=true")
Which works fine, but I have moved into getting the application ready for deployment and so I created a setup application in the same solution as the application. Now I have added the database file with the setup but when my application gets to the con.Open() line it catches an exception,
System.Data.SqlClient.SqlException: Database 'C:UsersJohnDocumentsVisual Studio 2008ProjectsBlackout_ScoutBlackout_Scoutinx86DebugDataTacticalDB.mdf' already exists. Choose a different database name.
Cannot attach the file 'C:Program Files (x86)MicrosoftSetup1DataTacticalDB.mdf' as database 'TacticalDB'.
[code]....
Now I only have the one place where the application should look for the Database and thats Application.startupPath/Data/TacticalDB.mdf and if im running the newly installed exe it shouldn't look back in the myprojects folder but it is.
I have a aspx page with several input fields(couple of int's and strings) and 3rd party gridview. Data is validated, and stored procedure is called from code behind to save data in DB. Gridview has capability to display error box to user which can be called from code behind. So when I catch exception I give it my error message(error message is something like:"Data can't be saved to database. Error:" & ex.message and call function that displays errorbox.
[Code]...
i keep on getting SqlException was unhandled incorrect syntax near '+'.i cant seen to see whats wrong with my code.i hope someone can help me solve this code.[code]
View 2 RepliesI'm currently trying to create a function to parse error messages to make them more helpful for the end user. Currently I'm working with SQLServer and VB.NET.
Right now I'm raising error 547 which looks like this:
DELETE statement conflicted with COLUMN REFERENCE
constraint Constraint Name. The conflict occurred
in database 'Database Name', table 'Table Name',
[Code].....
I'm able to pull every piece of information I need from the error message except the name of the parentTable. I've already determined that the SqlException doesn't store the statement that caused the exception, and as far as I can tell it doesn't store information about the name of the parent table, only the table that is trying to reference it.
Is there an easy way to get the name of the parentTable?
I'm I created a SQL Compact database for a program I'm working on and built the tables and forms. I'm trying to add the values entered into the textbox in to my SQL DB, but I keep getting the following Error Message.
"SqlException was unhandled:
A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)" Below is my code....Its erroing at the cnx.open()
Private Sub btnSend_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSend.Click
Dim cnx = New SqlConnection(My.Settings.TestDBConnectionString)
Dim sQuery = "INSERT INTO tblMain (Date) VALUES (@Date)"[code]......
An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.Data.SqlClient.SqlException: Invalid object name '#temp1'.
I'm using VB Express 2008 and MS SQL Express 2008. I have a couple of tables in my SQL database and among them are some log tables that track changes in the data entries of the substantive tables and fields I have. I have one log table fore each of the datatypes that appear in my substantive tables.
For example any change to any field in a substantive table where the field is of a bit type will be logged to the BitTypeLogTable. All of my log files are structured essentially the same. For example the structure for my BitTypeLogTable looks like this:
The other logs are identical except that the OrigValue and NewValue fields have different datatypes according to the datatype they are intended to track. For example the datatypes for those fields in the DatetimeTypeLog is datetime and in the MoneyTypeLog is money.
Each of the substantive tables in my database has three triggers which cause entries to be made to the log tables when the substantive fields are changed. For example, one of the UpdateTriggers looks like the following:
[Code]...
An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.Data.SqlClient.SqlException: Invalid object name '#temp1'.
Private Sub btnRegister_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnRegister.Click
Dim msg As String = ""
Dim result1 As Integer
conKk.Close()
[code]....
It stated that "incorrect syntax near 1"...
My application requires a user to log in and allows them to edit a list of things. However, it seems that if the same user always logs in and out and edits the list, this user will run into a "System.Data.SqlClient.SqlException: Timeout expired." error. I've read a comment about it possibly caused by uncommitted transactions. And I do have one going in the application.
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I have been using DBTransaction for my current projects that access a single database. However, I read some documentation on TransactionScope and was wondering in which scenario would using TransactionScope be better? Or should I be replacing DbTransaction calls with calls to TransactionScope?
View 2 RepliesSo, I have a textbox with the following text.
Code:
TITLE"Hello there"
blah blah blah etc...
I want my program to find the TITLE text, and then put the text in the double quotations in a variable.