DB/Reporting :: SQL Connection/ Connecting From VB 2008 App

Aug 24, 2011

We have developed a VB 2008 app that uses SQL Server 2005 Express to store data collected by this app. This app has been designed to allow multiple connections to the one centralized database.

I have ran a few tests, and confirmed that if one computer running our app is accessing a database residing on a different computer,and the network connection between two computers has been severed, it would take approximately 3.5 minutes before I would get a connection timed out exception error from within my code.

I have deliberately set the ConnectTimeout property in the SQL connection string to be 15 seconds. But some how, SQL database engine still retries until approx. 3.5 minutes later.

My thinking is that I have a subroutine that would attempt to open a database once a minute.If the open attempt is not successful, and resulted in an exception, then I would popup a message to notify the user that the connection is not available.

Doing it this way, I have confirmed that it would take about 1.5 minutes for it to re-establish the connection, once the actual network connection has been restored.

To make the long story short, I would like to find a way to shorten the detection for a broken connection, and let the user know sooner, rather than locking up the app during the 3.5 minutes period has elapsed, and at the mercy of the SQL database engine to timeout. And why would it take 3.5 minutes to timeout the connection attempt when I had explicitly use 15 seconds in my connection string?

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DB / Reporting :: VB 2008 Express - Establishing A Connection To A Database

Mar 9, 2010

1.Establishing a connection to a database(preferably one that is inherit within the project and can travel with it)

2. Setting the correct references to the database ( I tried connecting via JET with windows 7 and I get an error that I cannot use JET)

3. Query the database (Access) with SQL, and return those results to a recordset.

4. Loop through the recordset.

5. close the database connection

6. Open recordset and write data to table.

[Code]...

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DB/Reporting :: VB 2008 ADODC Connection Save, Edit And Delete Error?

Nov 27, 2010

Code:
Dim cn As New ADODB.Connection()
cn.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=D:BackupEon of LightEon Of Light.mdb"

[code]....

' This code not Working :('Error Messege in md.Save()

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DB/Reporting :: Connecting To An Access Database?

Aug 27, 2009

I'm trying to query an access database, but my query results only display the first cell of the query results.

For example, if I select 3 columns, 5 rows, only Column 1 Row 1 is displayed. Someone mentioned something about EOF but I can't find EOF code for OleDB. Should I be using another type of connection?;

Code:
Private Sub btnGetReport_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnGetReport.Click
Dim StartDate, EndDate As Date

[Code]....

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DB/Reporting :: Connecting To Mysql Database?

Apr 24, 2011

I can connect/login to my database, view a formatted table in the current window, however I want to click a button and see a new table set in a new window. Theoretically I should be still logged in/connection information saved but however I get 'unable to connect to database'.

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DB/Reporting :: Connecting To MySQL Version 5?

Feb 24, 2008

i am getting this error:

Code:
[Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified

When trying to connect to my database using the mySQL v5 drivers. I had the version 3.xx working fine until i installed the newer 5.0 drivers....

Code:
conn = New ADODB.Connection
With conn
.CursorLocation = ADODB.CursorLocationEnum.adUseServer

[code]....

But i can not seem to find the "correct" connection string for use with version 5..

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DB/Reporting :: Connecting A VB Front End With A MySQL Back End

Mar 27, 2012

how to connect a visual basic front end with a MySQL back end. I am not proficient in VB or MySQL and was not able to find anything on google as a result.

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DB/Reporting :: Connecting An SQL Server Database With VB Express?

Apr 14, 2009

I'm at an absolute loss here, I've read so many different things.I just want to add new records to a database I created using SQL Server 2008 with SQL statements in Visual Basic Express 2008. But I can't even connect/get it to recognise the database I created.The database name is 'database.mdf' and is situated in the MSSQL/DATA folder. So far I've read I need to use this code;

Code:
Conn.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data source=database.mdf"
Conn.Open()

[code]....

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DB/Reporting :: Connecting And Pulling Data From MS SQL Database?

Jul 21, 2009

I was wondering which way would be the easiest in VS2005 to connect to and pull data from a MS SQL database. I have already setup the database connection by choosing the datasource for a DataGridView but I'm not able to retreive any information.

The steps I have taken so far:

1. Make new form

2. Drag and drop DataGridView onto the form

3. Setup the data source and respective username password

Not sure where to go from here....

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DB/Reporting :: Connecting To Excel - Null Values?

Oct 22, 2008

I created a connection string for an excel file. I prefer this method as opposed to creating "Excel" objects since it is not restricted to a specific version of Excel.When I connect to the excel file, I step past the first few rows since they have data that is not needed. When I reach the first field that contains a date, then I begin my data import. However, at that point (A8), it shows the cell in the "A" column as having a Null value even though there is indeed a value in the cell. Columns "B" and "C" are fine.

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DB/Reporting :: Connecting To MySQL Database Online

Jan 6, 2011

I have a MySQL database online. What do I need to connect to it and exchange data?

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DB/Reporting :: Connecting To Dbase IV Database Files That Use Indexes

Jan 5, 2009

I've used visual basic in office before, but when it comes to writing applications in Visual Studio, my knowledge is fairly limited. I'm unsure on how to set up a connection in my application to connect with a dBase IV database that uses indexes (not sure if it matters if it has indexes or not). I will need to both read and write to this database.

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DB/Reporting :: Error ODBC Connecting To ACCESS On Win 7 64bit

Mar 3, 2011

i've developed a VB Net Application, that works with an access (2003) db. Now i've send it to a friend on mine with a new pc 64bit with win 7, and it doesn't works, more or less the error is: Quote:

[Code]...

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Connection String For Connecting To Databases?

Jun 24, 2011

what do connection strings depend on? like is there different strings on the basis of access version you use or on the .net framework used.. or is there some other criteria?i made a project with vb 2010, .net framework 4.0, access 2007 (.accdb), using icrosoft.ACE.OLEDB.12.0 as Provideri need to make it run on a system with no vb, .net framework 4.0, access 2003 (.mdb)

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Universal Way To Connecting To Excel Through OleDB Connection?

Nov 17, 2011

A While back I developed a application that connected to Excel using DB connection. It worked fine since the application was designed for usage on one particular PC with Excel 2003. I especially liked the solution since the data retrieval was much faster compared to what I would get if I connected to Excel using Interop libraries.

However, recently when I tried to implement the same solution onto another app that would run on various PC that could use different versions of MS Office I ran into multiple problems. First of all, I can't use the same connection string on various versions. Also, the whole x64 vs x86 thing is adding to the problem.

I wonder if there is a way to check the version and use the apropriate connection string for every version?

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DB/Reporting :: Error Connecting To Online Database Mysql After Fresh Installing

Nov 18, 2009

I have a problem here I did make database program for a friend the database is online Mysql I use Visual Studio and put this into setup.exe when he install the program and try to log on he get this error This is my connection to the database

[Code]...

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ExecuteReader Requires An Open And Available Connection. ...current State Is Connecting

Apr 21, 2010

Using VS 2005 and SQL Express 2005. This WinForm application runs fine on 5 out of 6 stand alone computers that is it installed on. The 6th computer is slightly older running XP sp2.As I understand it, using DbDataAdapter will perform the open, close and dispose functions for you. Therefore, Pooling should not be an issue. I am thinking that the default 15 second time out setting may be the cause?? There is some MultiThreading that will also use DbDataAdapters in the same manner but only 3-4 would be firing at the same time.The connection string is Data Source=(local)DataBase;Initial Catalog=Code;Integrated Security=True The command which throws the exception is If CodeDataAdapter.Fill(CodeDataSet.CodeTable) > 0 Then...So I am thinking that adding Connect Timeout = 60 to the connection string even though the 15 second default seems like a lifetime. Could this 15 seconds be eaten up if some other process or application takes over?

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DB/Reporting :: Slow Connection Using ADO?

Apr 11, 2008

i know this question was asked a couple of years ago by TheMinistered .. but i cannot find an answer, and i have exaclty the same problem (using both VB6 and VB.net 2003) :

When I attempt to connect to a remote SQL server via ADO it takes almost 20-30 seconds before Open returns. I don't know if it's something I'm doing wrong... here is my connection string/code:

Private Sub Class_Initialize()
Dim strConnectionString As String
Set m_objConnection = New Connection

[Code]......

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DB/Reporting :: Access Connection Strings?

Sep 12, 2011

I have been struggling with the construction of an Access connection string. Here's the problem.My Visual Basic 2008 project is located in a disk partition on my hard drive that I have named S:. My Access MDB file is in the same location.When I deploy the application it obviously will not be in an S: drive on the user's machine. My concern is that if I construct the Connection String using the file designations on my computer as:

(Provider =Microsoft.Jet.OLEDB.4.0; Data Source =S:MyApplicationmydatabase.mdb; User Id =admin; Password =

The deployed application won't know where to look for the data file. I know there are some shortcuts that will allow me to construct the connection string, but I do not know either the designated names or where to find them.

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DB/Reporting :: Change A Connection String?

Jul 23, 2008

I have created a very simple Visual Studio .net 2002 VB# program. It consists of form1 containing a DataGrid bound to an Access 2007 Database using OleDbConnection1, OleDbDataAdapter1 and DataSet11.The location address of the Database will change based on the user so, I need to make the connection string variable. Problem is inserting the following string variable "source=" & strFileLocation & ";" creates a fatal error

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DB/Reporting :: Check If Sql Connection Is Good?

May 31, 2009

I have a little problem with checking if a sql connection is good.

Attached here i have a simple vb.net program that should check if the sql connection to the sql server is good. If i just run it once it works very well. But if i use it in a timer and check the connection to the sql server every 10sec it will only tell me that the connection is good (V=0).

I have tested the code with turning of the sql server service.

Dim connect As String = "Server=192.168.1.2;Database=Test;User ID=sa;Password=12345;Trusted_Connection=False"
Dim sqlconnection As New System.Data.SqlClient.SqlConnection(connect)

[Code].....

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DB/Reporting :: Connection Error With SQLCE

Jun 3, 2009

I get an error using the connection string (url...) to connect to my SQL CE saying that "Provider 'Microsoft.SqlServerCe. Client.3.5' is not registered in the local PC.".In my project I have a table connected (with the wizard) to the same database and it works fine, but when i try to connect with my own code it FAIL. [code]

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DB/Reporting :: Connection To A Remote Database

Feb 17, 2009

I have a problem with the connection to my database. It's on a remote server, and this is my code:

[Code]....

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DB/Reporting :: DataGridView Populate With SQL Connection?

May 14, 2010

I'm connecting a MS-SQL remotely with VB2008 Express.I defined two different methods - the first one is copied from my old VB6 application, which is working perfectly.In this application, the retrieved data is added to a listview control, not datagrid!

Code:
Dim myconn As ADODB.Connection
Dim MyRecSet As ADODB.Recordset
myconn = New ADODB.Connection

[code]....

The SQL query contain several table, thus I used a "*" instead for the table name- not sure this is correct?

Code:
da.Fill(ds,"*")

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DB/Reporting :: IDataReader And Connection Open?

Dec 28, 2010

In our application we use IDataReader which actually call function from one.dll where weExecureDataReader()
We have many calls in application and in some places For some reason I am getting error message "DataReader already open" but I am not sure where.What will happend if I simple close that conection in the that .dll? Am I going to make trouble to database because one datareader left opened? I assume closing connection will close reader too and gargage collector will manage that left opened datareader..

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DB/Reporting :: Manage Connection After Search?

Aug 8, 2009

I am trying to use RAP (rabid application development). So I have created a database with a datagridview to show all information and textboxes to modify the informations. So far so good.

The problem is created when I try to use the search facility on the datagridview. The search is working but the problem is that the textboxes are not following the search criteria . I can configure this manual but I would like to know which is the easier way to configure the textboxes to show the value of my search criteria.

I also want to know how when I finished with the search criteria and empty the search the text boxes to make the connections back as they were before.

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DB/Reporting :: Rdp Connection String From Database?

Sep 24, 2009

I have just written an application for myself and a few other users to use .rdp to connect to a number of servers, by clicking on the appropriate button. In the full version of the program I have two sets of connections one for when we are inside our vpn, which uses local ip addresses and DNS names; and the other which uses the external IP addresses and DNS names.This works quite well; if the user has stored credentials on their pc for the connection they connect straightaway; and if they don't the .rdp dialogue opens up with the server name/address filled in, ready for them to edit the rest of the required information.The problem for me is that this means I have to code 43 different Private Subs and then link the buttons; and I was hoping that instead of individually coding each connection, I could get the users to:Select by an option button whether the connection was internal or external

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DB/Reporting :: SQL Connection Open/close?

Dec 16, 2011

SQL connections confuse me sometimes In almost every SQL related code on the internet the routine is like this;

* Open connection
* Execute SQL command
* Close connection

Is it good practice to just open a connection when the application starts and use that connection until the application closes?I know that sequential connections are required when processing more queries, but what if I need to poll a certain Table every x seconds? Isn't is better to keep that single connection open for as long as the application is running (and re-open when a failure occurs) instead of opening a new connection every x seconds?

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DB/Reporting :: SQL Database Connection Test?

May 6, 2008

I am new to Visual basic and am using visual basic 2008 to write programs in, I have setup a database connection and the connection string is currently stored in the settings section of the project.I would like to have a menu item where when the user selects "test database connection" it will run the sub for testing if the database is established.

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DB/Reporting :: Sql Express Close Connection?

Sep 29, 2010

I have an SQl Connection: Con

con.close

after I close the connection I cannot copy the Sql Express Db because it is still in use but I have CLOSED the connection.

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