VS 2008 How To Test If Sqlite Database Is Locked
Jul 2, 2009
I am accessing an sqlite database file from my VB.NET application.Currently, I use Try... Catch when opening the connection to the database, however if the database is locked by another application, it will take 5-10 seconds to throw the exception which says that the database is locked.
So I want to know if there is a way to test if the database is locked before I try to open the connection... because the long 5-10 second pause is annoying.
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Apr 13, 2011
I'm a newbie in programming and visual basic 2008 language.I'm learning to use sqlite database in visual basic 2008, and I got the following tutorial code. The code is working correctly and my question is: what is the meaning of that ! mark in the code. Please point to me where to get more information as I wish to learn more about that. I have Windows Sdk v6.1 installed.
[Code]...
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Jan 30, 2012
i'm just starting with sqlite, as apparently its quicker than access for a real time logger. i'm using this as a tutorial - i didn't install the runtime support with SQLite as it causes issues when using 2008 express.[URL]..
but it seems the data isn't being written to to the db. i can't tell exactly because i dont have a program to view the table contents, only to view the setup of the db.
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May 29, 2012
I am writing an app that uses both an SQLite and MySql database. The reason for this before you ask is that it means I can store a local copy of the data onto my user' own machines when they are offline, and then update them to a central server when they are next online.
The problem I have is that when using datasets (on tables created in identical fashion) the itemarray of the mysql database has 9 extra totally blank fields...where as the SQLite itemarray has only the values for the items.
here is a snippet of the code:
CODE:
ultimately I am getting an index size mismatch error but with both tables having the same number of fields this is confusing.
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Jun 22, 2011
i am deleting from an sqlite database using the ids of the records like this the dirID is an array of the IDs Dim i As Integer = 0
[Code]...
the problem is that it dosen't alwasy delete from the database, and its not throwing any errors. Could there be a better way of deleting
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Feb 24, 2011
I am using SQLite ADO.NET Provider.
I want to create a database with 2 tables via code in vb.net .
Please provide code for the same.
I am using VS 2010 Winforms, working under XP SP3 Pro
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Apr 2, 2009
I'm writing a program that needs to parse data from a SQLite Database, I have the reference DLL but I do not know the proper syntax for the actual parsing of the file. The reference I have is located at [URL]..I don't really see any code that would need to be given seeing as the code for that class is currently something link:
Imports System.data.SQLite
public class SQLite
public sub Retrieve_Data
end sub
public sub Connect2SQLite
end sub
end class
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Apr 21, 2012
I'm trying to read a BLOB from a SQLite Database.
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Feb 1, 2010
I am using System.Data.SQLite with VB 2010 to bind to a SQLite database. Everything works just as it did in VB2005. I drug a table from the DataSources Window onto the form and automatically generated the binding navigator, table adapters, etc. I can preview data in the TableAdapter but when I run the app no data is read into the grid. The same thing happens with the details view. The BindingNavigator shows 0 of 0 records. There are 27 records visible when I preview the data. The code follows:
[Code]...
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Apr 28, 2011
I created a small program which one uses the SQLite database. I have a simple table employees, composed of the name and password. I can not write sql script correctly. application code is:
Imports System.Data
Imports System.Data.SQLite
Public Class Form1
Private Sub btnLogin_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnLogin.Click
[Code]...
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Dec 21, 2009
I am trying to retrieve a password from an SQLite database. The id of the row the password is in is 1. I want to assignt his password to a variable called actualpass.[code]
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Sep 26, 2010
The situation is this. I have an application written in vb.net. it consists or two parts. One on a PC and the other on a handheld windows mobile 6 device . The desktop program transfers a SQLServer compact database to and from the handheld device using activesync via USB. Potentially we want to look into having android handheld devices also supported by this application. Now I know I can use SQLite with .net. I know I can use ADB to push and pull data (and therefore the database files) to and from the device.
What I need to know is can I access ADB directly from VB.NET as an API or SDK rather than having to do it manually.
Unless of course I'm missing something and I can copy databases to and from the device in some other way?
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Dec 12, 2009
[Code]...
How can i get around this problem? rename all files with ' character?
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Aug 14, 2010
I'm am wanting to get out of access dbs and into something more solid, ive heard that sqlite or mysql are great database tools for your applications. I am also looking for a database with a GUi to manage the database more easily and links on how to incorporate the database into my projects, etc. So any links,videos, suggestions i'd like to hear them all.
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Oct 24, 2011
I am having some issues with an application written in VB.net.
As part of a routine, an sqlce database gets backed up before the routine then if an error occurred gets restored. I am using system.io methods copy and delete.
I have released all the objects (connections, commands, datareaders) asscociated with the sqlce database by disposing them if they are not nothing. I also do a GC.COLLECT however when my delete command runs, an error message says it is open by another process. The PROCEXP.exe process explorer tool says it is attached to 4 undefined processes. After a while in debug mode, these clear and I am able to delete the file. However this is not acceptable as my program cannot "wait around" until they are released! I was under the impression that object.dispose forced an immediate disposal rather than waiting for the garbage collector to clean up (if you were just to use object=nothing), but still there appears to be a finite time before these objects are released.
My question is, is there an alternative way of checking (programatically in vb) for what is holding open an sqlce database (or in fact any other file for that matter) then killing these processes?
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Nov 12, 2009
I've noticed that a few download management programs do this, like uTorrent for example, where you can set it to shut down the system when the download(s) complete and I would like to implement this in my app as well.
Right now I'm using
Process.Start("shutdown.exe", "-s -t 05")
which works fine if the user is logged in, but my home computer has the screen saver set to lock the computer in which all my app does is exit but the system doesn't shut down like it does when it's logged in. In uTorrent the system shuts down whether the user is logged in or the system is locked Also I would like to know how to detect if the system is locked or not because if they are logged in I, like uTorrent, would like to prompt the user that the system is about to shut down and give them 30 seconds to cancel it.In addition to
Process.Start("shutdown.exe", "-s -t 05")
I also know about
<DllImport("user32.dll")> _
Public Shared Function ExitWindowsEx(ByVal uFlags As Integer, ByVal dwReason As Integer) As Integer
End Function
Call ExitWindowsEx(1I, 0I) 'Shut Down
but this doesn't shut down the system if it's locked either.
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Aug 23, 2009
My application i am using on another computer (Windows Vista) has got a screenshot code inside a timer of 10 seconds. It works perfectly until the user Locks Windows.
When the user locks windows or switches user then the application throws a hissy fit and errors because it cannot take screenshot pictures.
Is there a way i can tell if the computer has been locked and the been unlocked
This way i can have a timer of 1 second and if the computer has been locked then the timer for the screenshots can been stopped , and then when the user logs back in the timer can restart.
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Apr 1, 2009
I have some code that does a Find & Replace in some text files, and closes the file when complete.However, when I try to use the Kill command in VB to cleanup these files (they are temporary files) when the program is closed, I get errors that the file is in use by another app or process.Is there a way I can force these files to close first? This also happens when I scan a document using the EZTWAIN.dll Scan to native function.Everything goes fine, but if I try to scan again to overwrite the file, the file is in use.This is happening on Windows Vista SP1.
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Oct 24, 2011
What is the best way to easily switch from a test database to a production database in vb.net and MySql, when all MySql connection strings are currently hard coded?
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Jul 25, 2012
I am using VS2008 and SQLite. I have created a database and several tables and am attempting to populate the tables with data from arrays.
The following code (example) works fine but stops after it inserts 30 to 50 records. I am running the VB code in debug mode and when it stops, I press pause to see where it is. It stops on "SQLcommand.ExecuteNonQuery()" and when I press continue (F5) it will insert another 30 to 50 records.
I do not get an error message. Is this a timeout issue? How do I keep the loop running to the end of the array?
Following is example code.
Dim
SQLconnect As New SQLite.SQLiteConnection()
Dim SQLcommand As SQLiteCommand
CODE:.....................
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Feb 24, 2010
I'm only getting started with VB.Net, using VB Express 2008.Using the System.Data.SQLite wrapper, I need to read data off a SQLite database file, and chart data using basic bars, pies, lines, etc. Nothing fancy.
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Mar 18, 2011
when using the ExecuteReader() command with an SQL database, with an example as follows:
DUReader01 = DUCommand01.ExecuteReader()
DUReader01.Read()
DUCounter01 = DUReader01.Item("Counter")
I am looking for a simple code example that will test to determine if the database first is empty before attempting the Item()
command.With the above example, the Item() line produces the error "Conversion from type 'DBNull' to type 'Integer' is not valid." for an empty database.
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Oct 14, 2010
[URL] to create my sqlite db file. I created it as a sqlite db version 3 file. When I go to open the connection
[Code]...
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Oct 27, 2011
I am making an application that adds around 20 records to the database at one time. I've never really added this many (in a for loop) that quickly usually its one at a time. I get the error that the database is locked when I try to add the items to the DB.
I call the add method for each item I'm saving, then go to the next one.
[Code]...
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Aug 21, 2009
I have a simple .NET 3.5 app for changing some database fields using an ODBCDataSet. Now the Feature Creep is asking if I can hide or show tabs and other controls based on the user's database permissions. Ideally, I would like to control the permissions only on the SQL Server using Windows user groups, and the app would not have any built-in authentication or permission system--it simply uses the logged-in user's Windows account for the database connection. So thus it would have to "test" the permissions to determine whether or not to show the tabs for the user. For example, if they have "write" permissions to a certain table, then the tab for editing it would be visible; if not, the tab never loads for them. How can I list or test the user's permissions to the ODBCDataSet?
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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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Jun 4, 2010
I have a text box which I'm saving to a database. Before doing a addnew which add a line to the database with a Id number and a blank item, I wish to test the textbox for actualentry before. Here's code I'm tryin
If
Me.TextBox1.TextLength > 0
Then
[code].....
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Jun 3, 2009
I am having a problem with a unit test I have created. First time doing this so I am not sure why I am getting this error [code]Test method ETDS_Unit_Tests.LoginTest.ValidateUserNameTest threw exception: System.Data.SqlClient.SqlException: 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: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server).This is the same connection that my software is using, and the software runs fine, only the unit test is failing. What I am doing wrong? It Seems to fail one time for each datarow in the table.Also, I am using a Linq Query in the method that I being tested. I believe that this may be what is causing my error.
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Jun 3, 2011
I use Visual studio 2008 I use MYSQL 5.1 I want only to backup database Test to to a specific directory.I use the application settings to determine which directory(see attachment).Green shaded code works perfect.
Red shaded code works not!! This is with My.settings.I can not see the error code, it goes too fast, I can not capture this with:
[Code]...
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Feb 17, 2011
I have been left to maintain some vb.net applications - all of which utilize SQL server 2000 as the backend db. I need to change a report in one of the apps to include some newly added fields fromt eh database. I added the new fields to the specific table in the "testing" SQL server database which is on a completely different server. I am creating a new data source and have selected the database icon and then selected a connection string that clearly points to the test database on the test machine. I then selected the table containing the two new fields but for some strange reason, the two new fields I added are still not showing up in the list there! I have checked and double checked and it's as if it's still pointing to the live database on the live server where these fields do not even exist yet.
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