Asp.net - .NET Framework Data Provider For Oracle Multiple Open Connection
Jan 17, 2012
I have the below mentioned code in a seperate class file for establishing connection and carry out DB transactions. I have an issue where multiple connections being opened which sometime exceed the connection pool. When I stepped through the code I found that there are codes which call ConnectDB() in a loop without calling DisconnectDB(). But I expected that the condition OraConn.State = ConnectionState.Closed should handle the situation. Somehow the condition is always satisfied hence openning another set of connection. Can you suggest where am I going wrong and also what best practice can be adopted here?
[Code]...
The connection is again opened in function updData(). While I understand that it has to be closed correctly but keeping tab on every developer is not possible. Hence I want to control it directly from the connection class by using the same connection but the condition If OraConn.State = ConnectionState.
UPDATE I have put the code in UpdateDB under a Using block and removed call to ConnectDB and DisconnectDB from function like InsertData(...). It seems that the issue has been resolved. But I would like to know in case of exception will the connection remain open? and also OraConn is a public variable defined outside Using block so will it be disposed of by the GC?
[Code]...
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Jul 24, 2007
I am trying to save an image at oracle data base with OLEDB provider and i used the function which written below there is no error appeared but in the same time the image field still null that means the image value was not saved in the db
note:
dim DBConnection as oledbConnection
dim DBTransaction as oledbTransaction
[code]....
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Dec 29, 2009
can you tell me,how can i add a provider for oracle(Microsoft Provider oledb for oracle).Actually i had Microsoft ODBC for oracle but i want to add a provider above mention.
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May 18, 2009
I am trying to open an Oracle database connection in vb.net 2008 in order to issue a Select statement and the populate a listbox with it.
My code is as follows:
Dim orclstr As String = _
"Provider=OraOLEDB.Oracle;" & _
"Data Source=10.0.0.77;" & _
"User ID=myuser;" & _
[code]....
Obviously, I am doing something wrong, but I can't figure out what.
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Sep 27, 2011
i am using visual studio 2008 and oracle database 10g. I trying to connect to the backend like this Subwindow "Server explorer". Push button "Connect to database" and make next chain Data Connection->Choose Data Source->Oracle Database->oracle Data provider for .Net->Continue->Data Source name oraclexe->Userneme: hr password: hr -> Test connection (answer "Test connected succeeded ")->push button OK and.
"Unable to find the requested .Net Framework Data Provider. It May not be installed"
i have made changes to machine.config
<add name="Oracle Data Provider for .NET"
invariant="Oracle.DataAccess.Client" description="Oracle Data Provider for .NET"
type="Oracle.DataAccess.Client.OracleClientFactory,
Oracle.DataAccess, Version=2.111.6.20, Culture=neutral, PublicKeyToken=89b483f429c47342" />
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Oct 5, 2009
I get a strange error when I am dragging tables from the server explorer into the datasetSome updating commands could not be generated automatically. The database returned the following error:Failed to find or load the registered .NET Framework Data ProviderI never had it before. I reinstalled .NET Framework 3.Some specs:
Local SQL Express 2005
Windows authentication
Visual Studio 2008
[code].....
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Mar 11, 2010
I got this Error Message while I try to preview the records in Dataset Designer:"The connection string could not be found or Data provider associated with the connection string could not be loaded"
Here is my dataset.xsd code
<Connections>
<Connection AppSettingsObjectName="MySettings" AppSettingsPropertyName="loginConnectionString1" IsAppSettingsProperty="true" Modifier="Assembly" Name="loginConnectionString1 (MySettings)"
[code]....
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Apr 20, 2010
I want to desing a form using Ms-access & Oledb connection Provider for data entry having following buttons:
1. Add
2. Edit/modify
3. View
4. delete
5. Exit
6. First record
7. Next record
8. previous Record
9. Last Record
10.Save
11. Cancel
12. find/Search
I want to desing a form using Ms-access & Oledb connection Provider for data entry having following buttons:
1. Add
2. Edit/modify
3. View
4. delete
5. Exit
6. First record
7. Next record
8. previous Record
9. Last Record
10.Save
11. Cancel
12. find/Search
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Oct 21, 2010
I'm converting some RDO code to ODBC Provider code in .NET.The problem is parameter names were not specified in the orignal code, but param values were retrieved by parameter name after the command was executed.Is there anyway to have parameter names populated by the provider once the command is executed so calling code can access params by name.Let me show you an example of the declaration of param and accessing of it.
[Code]...
You can now see how this "used to work in RDO/VB". For some reason it would accept this and know what the param names were after execution. I imagine it had to do another round trip to the db to get this info.
Is there anyway to mimic this behaviour in .NET for ODBC Provider (using Oracle)? Or am I stuck manually specifying the param names in the code (I understand this is the better option, but wondering what the alternative is to match the original code as closely as possible).
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Mar 29, 2012
I recently upgraded my system to Windows 7 64bit and ever since then I have had nothing but issues with my code attempting to access an Oracle database. I was using msdaora for my connection string however that does not work in 64bit. I changed over to OraOLEDB.Oracle which everything I can find on Google says to use however it fails every time. I have installed Oracle 11g 2 times now and even tried reinstalling VB.net 2010 and still no luck.
Here is my connection string....
Code:
MyConn.ConnectionString = "Provider=OraOLEDB.Oracle;Server=emsp.grhq.XXXX.com;Data Source=emsp;User Id=XXXX;password=XXXX"
And I am inporting....
Code:
Imports System.Data.OracleClient
Yet when I try it says...
Quote:
Provider cannot be found. It may not be properly installed.
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Mar 24, 2011
I have a problem reading data from an RFID-reader. I connect to the reader by tcp and wait for DataAvailable to be true, then reading the data until I got a end of data character. Then I just go back and waiting for a new DataAvailable. This is done in a own thread for the function.
There seems to be some kind of timeout, If I don't got any data in a couple of minutes, then it just sits there in the do/loop waiting for DataAvailable. I hold the card to the RFID reader, it beeps, but there is no data available. I don't get any exeptions, and the information says that the clientsocket is still connected. Are there anything more I can check?
If I put the card to the reader in a minute-interval it seems as this will never occur. So 2-3 minutes idle:ing seems to do this.
Here are my code to read data from the socket, I have taken away some irrelevant code:
Sub test(ByVal ip As String, ByVal port As Integer)
' this sub is meant to run forever
[CODE]......................
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Sep 3, 2011
I understand the possibilities for encrypting a connection string in .net v4. I have a win forms application that will be used by multiple people on different machines. I understand that I need to protect the connection string at time of the app being first run on the target machine. However I am concerned that for a period of time my connection string will be unencrypted. I am looking for advice in how to deploy my app with the connection string already encrypted or encrypted during installation. encrypting the connection string in a secure way?
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Sep 8, 2009
Given a connection object (or series of them), does anyone know of a way to backtrack and get the provider name? I'm trying to create a generic dataset generator that someone could load up with n DbCommand instances populate the dataset without requiring any further information.
Theoretically, as a command requires a connection object, that's all the information one should need to create this tool.Given that I'm populating tables in a dataset, I figured the simplest way would be using a DataAdapter. The only problem is that to generate a generic DataAdapter, I seem to have to go through the provider factory which requires a provider string - which I don't have.
Also, given that the provider for each command could potentially be different (i.e. commands across numerous databases), does anyone have any suggestions that would keep this simple?I'd like not to have to require the user to provide the provider string for each command object if I can avoid it. This way the user can just pass a param array of DbCommands and I can take it from there.
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Oct 24, 2010
I'm trying to set up a database connection between an ASP page running VBScript, and I have found code to do this. However, the 'provider' attribute to the connection does not work. The code is below:
set conn=Server.CreateObject("ADODB.Connection")
<strong>conn.Provider</strong>="Microsoft.Jet.OLEDB.4.0"
conn.Open(Server.MapPath("mIndexDb.xls"))
set rs = Server.CreateObject("ADODB.recordset")
rs.Open "Select * From mIndexDbTable", conn
[Code]...
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Mar 27, 2012
I have put my tns connection into the .ora file and am now able to conenct to it using SQL plus and can ping it :tnsping myConn.I've also added the connection to the ODBC Manager and connecting successfully when tetsing conneciton through the ODBC tool.now i'm having an issue making a connection to it using vb.net..[code]
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Jul 8, 2010
I've created a small DLL, an addin for Autodesk Inventor, this addin saves some information provided by the user and the program to an access(mdb)database.The whole idea behind this is that it allows users to quickly find drawings, assemblies and so on.The DLL works great on x86 systems however it has issues on x64 because I used ado.net.In a attempt to solve it I forced .net to compile it with the target x86 CPU settings.
However using this I'm unable register the dll (C:WINDOWSMicrosoft.NETFramework64v2.0.50727RegAsm.exe /codebase SavetoDatabase.dll )It says its not a proper .net dll file and therefore cannot be registered.
is there any other access-database connection provider (like dao or ado.net) that works on a 64 bit machine? Or do I need to change from mdb databases to another type (like mysql)? because sooner or later all machines its running on will be converted to x64.Or do I need to register the dll in another way?I've also tried to replace the conn.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0 with ACE, with no luck however
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Apr 21, 2009
When using SQL connections in my program, will I have to open and close the connection and the data reader each time I want to access the database ?
[code]...
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Aug 22, 2011
I am seeing a strange intermittent connection failure. My application works just fine and then starts throwing connection failure exceptions. A reset of IIS is required before the app will start working again.I've been able to trace a few of the failures back to an unexpected restart of the oracle cluster but not all of them. Has anyone else seen this problem? I've searched the web but haven't found anything.
Client - Win2003 server, IIS running ASP.net 2.0.50727, code is VB.NET, ODBC connection via Oracle Client 10.2.0.1.0 Server - Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production on a Linux cluster.
[Code]...
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Jan 26, 2011
i am trying to connect to it via VB.net 2010. I have been trying the following:
Dim myConnection As OleDbConnection
Dim myCommand As OleDbCommand
Dim dr As OleDbDataReader
[Code]....
And i get the error on the Catch ee As Exception line: ORA-12560: TNS:protocol adapter error
I also have a tnsnames.ora file on my computer but i am unsure if i need to use that when connecting (or really, how too in the first place)? Is it needed for the code above?
I am trying to use a DNS-Less connection to the DB. Not sure if that is what it is doing in this or not?
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Sep 8, 2010
Anyone know where I might be able to find code examples for connecting to an existing Oracle DB? I need to connect to my company's oracle db so I can write strings to it, verify strings, and read from it. I've found bits and pieces of code here and there, but nothing for all of it. I am a novice programmer and I am trying to add a db connection to an existing project for our plant to access the data. Our IT dept. is helping me with the db end.
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Apr 27, 2011
I have a vb.net program that is failing, but giving no errors. I've just discovered that the code I am using is deprecated. But what is the replacment? (That seems like something useful for MSDN to list, but I'm sure not seeing it.)
Private Sub SetConnectionToDB(ByRef oCMD As OracleCommand)
Dim connectionString As String
connectionString = My.Settings.ImportDataConnectionString
[code]....
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May 21, 2010
I use the following code in a webservice to fill a SQL 2008 database.
[Code]...
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Aug 13, 2011
In my program I got multiple spots where I open a Connection to an Oracle database, read some lines via a stored procedure which returns me a cursor, put them in an IDataReader, close the connection and go on.
Now everything works fine till the point of closing the connection. I've watched the connections opened to the database via TOAD for Oracle and I figured out, that the database seems to keep an connection opened after I said m_Connection.Close and m_Connection.Dispose.
I use Oracle.DataAccess and get an error after a short time, that there are to many connections. I debuged my session and made sure, that vb performs the close() command and it does it, but the database not.
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Jan 19, 2011
I've been viewing the tutorial at [URL]...08-088541.html but I'm still having issues creating my connection to our Oracle database. Here's my code, which uses the same connection string as one of my VB6 programs (no password required for database--Oracle picks up windows name) :
Private Sub frmMain_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
'Create connection object
Dim OraDB As String = "Data Source=databaseneme;Persist Security Info=False"
Dim conn As New OracleConnection(OraDB)
conn.ConnectionString = OraDB
conn.Open()
Me.Show()
End Sub
I've been using .NET for all of 10 mins so the error may be painfully obvious!
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Apr 8, 2011
I'm trying to develop a simple app with vb.net in VS 2010 that could monitor the ODBC connections via DSN made on the macnhine running this app.My scenario is an application (non Vb) running on a workstation that connects to an MS Access database on a network share.
The application (non Vb) connects using a link (ODBC connection via Oracle 10G) to the tables on the Oracle side.My VB.net Application should monitor the machine running the main application for ODBC connections drops and alert me via email for example.My question is where in the framework can I find something to instantiate or reference in order to check ODBC connections states constantly as well as network disconnection issues as well so I can log and /or alert when possible for network problems and ODBC connection problems for all the applications that might run on the host (machine running my vb app).
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May 1, 2009
I'm connecting succesfully to an Oracle 10g DB with an the Microsoft ODBC for Oracle driver.Regular queries without parameters work fine, but parameterized queries act as if the parameters aren't getting passed in.ex.
--this works fine
Select * from tbl1 where column1 = 'test'
--this doesn't
select * from tbl1 where column1 = ?
--odbc string parameter 'test'
Here's what my connection string looks like:
"Driver={Microsoft ODBC for Oracle}; " & _
"CONNECTSTRING=(DESCRIPTION=" & _
"(ADDRESS=(PROTOCOL=TCP)" & _
[code]....
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Nov 21, 2009
I'm starting using a project for smart device in windows CE 5. I'm using visual basic of v. studio 2008.I need to create a dynamic connection between a PDA (codebar lector) and an server with ORACLE 9i. The PDA connected via WIFI. But in my vb project I don't find OLEDB or ODBC elements.
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Mar 16, 2012
I am developing a program to manage inventory and accounts. different clients need different databases like oracle/sqlserver/mysql etc. i want to make my solution work with all these database servers by only changing one string value . i want to declare like :
[Code]...
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May 14, 2010
The fact is I'm making an application, which users can install by using a Setup file...once installed the data in the database can be updated by a centralized server. To do this, they can insert a DVD/CD-ROM and export the necessary data towards it. I need to do it that way, because some of the users who really need this data will be using stand alone computers.The application gets it's data from a mdb-file and the connection remains open as long a person works with the application (maybe not the best way to do, but I know :-) )...when the user uses the application, he can perform an export...this exports the .ini-file and pictures (which works fine), but he also needs to export the mdb behind the application...I already tried connection.close() before and connection.open() after the System.IO.File.Copy...but that doesn't seems to work.
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Aug 3, 2011
i have an application. which is executed after every 5 mins. i have an open connection but it gives me the following error:
ExecuteScalar requires an open and available Connection. The connection's current state is closed.
my code is something like this. I have shown where all i am using ExceuteScalar()
Sub Main()
Try
connection.open()
cmd.ExecuteScalar()
[code]....
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