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.
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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.
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.
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.
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
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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
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
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
I'm trying to read a BLOB from a SQLite Database.
View 3 RepliesI 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:
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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
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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]
View 1 RepliesThe 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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How can i get around this problem? rename all files with ' character?
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.
View 9 RepliesI 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
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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.
View 1 Replies[URL] to create my sqlite db file. I created it as a sqlite db version 3 file. When I go to open the connection
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I have a SQLite database and I am tyring to query the max value in the RecordID field. This query works when I run it in SQLite but I can not get the VB to return the value, what have I done wrong?
Dim getMaxRecID As String = "SELECT MAX(RecordID) FROM String"
Using cmd1 As New SQLiteCommand(getMaxRecID, pConn)
cmd1.CommandType = CommandType.Text
Dim IDresults As Integer
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The connection is correctly opening the db, and shows it as open as well. No error, just IDresults returns 0 everytime.
Depending on what i know, SQLite is supported in WP7.1, but i cant even import System.Data.SQLite to the project should i download it as a dll specially for windows phone or am i missing something?!
View 1 RepliesI'm trying to Collect Bids and Distribute the average from a Column I'm getting an InvalidCast Exception: Specified cast is not valid. on the TotalSum +=
Dim sql As String = "SELECT " & Column & " FROM " & Table & " ;"
Dim dt As DataTable = SQLiteDatabase.GetDataTable(sql)
Column = Column.Replace("[", "")
Column = Column.Replace("]", "")
For Each row As DataRow In dt.Rows
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I'm using VB.NET and MSSQL 2005 to create an application. I was told I should rather use SQLite as I want my application to be a standalone one with embedded database. Can someone please provide me with a step to step tutorial on how to create a standalone application with an embedded database?
View 2 RepliesI have records from server that I want to copy, so I used datareader to select all, during selection the insert also process. [Code] What is the exact sql statement to insert only if record doesn't exist in my current table? I used some of this code, but a filter was defined: like x. What if I just want to insert records that doesn't exist in the table I want. [Code]
View 1 RepliesI have this records in the table:
username, password, rights, allowance
admin, asdf, admin, 20
john, qwer, user, 10
peter, zxcv, user, 10
I want to select one record at a time
I used:
for i as integer = 1 to sqliteDataReader.FieldCount
dim ss as string = "select * from xtable where recno()=" & Ctr(i)
...
Next
But it doesn't get 1 record at a time.
I have an StackOverflowException in one of my DB functions that I don't know how to deal with. I have a SQLite database with one table "tblEmployees" that holds records for each employees (several thousand posts) and usually this function runs without any problem.
But sometimes after the the function is called a thousand times it breaks with an StackOverflowException at the line "ReturnTable.Load(reader)" with the message: An unhandled exception of type 'System.StackOverflowException' occurred in System.Data.SQLite.dll
If I restart the application it has no problem to continue with the exact same post it last crashed on. I can also make the exactly same DB-call from SQLite Admin at the crash time without no problems.
Here is the code:
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When crashes, the reader has "Property evaluation failed." in all values.I assume there is some problem with allocated memory that isn't released correctly, but can't figure out what object it's all about. The DB-connection opens when the DB-class object is created and closes on main form Dispose.
Should I maybe dispose the mycommand object every time in a finally block? But wouldn't that result in a closed DB-connection?
I need a simple embedded database for a relatively small database size (< 100MB, but in most cases < 20MB) and maximum 1-2 concurrent users/connections on average. It must be able to protect/encrypt it's data with a login.
View 4 RepliesHere's the situation - I have a vb.net exe compiled for X86 machines using 2 dll's... Because one of the dll's was only provided in 32 bit, and I didn't want to have to deal with 32/64 versions, I forced 32 bit in compile options and everything was fine. Now I have a 64 bit workstation that is throwing an error about the sqlite.dll (error #1 below).
after reading around I am starting to understand a lot of people are having this issue. I tried replacing the dll on the client machine with the 64 bit version of sqlite and that didn't work (error #2). I read somewhere that the 64 bit version requires VC 2010 redistro, but that didn't work. I can't compile this app as a 64 bit because of the other dll is 32 bit.
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To populate my database I have been using the builtin SQLite command for datetime:INSERT INTO samples (timestamp, sample_value) Values(datetime('now','localtime'), ...)When I look at this on my Mac using a SQLite Reader called Base I see the following timestring:
View 1 RepliesFirst of all I'm quite new in programming VB.NET, so maybe I asking a simple question. But so far I was not able to solve my problem.I developed an VB.NET application in VS2010. For the database I use SQLite V3.In VS2010 all is working fine, but when I build my application and run it under windows I got a message that I use a mixed .NET envionment. An error occurred creating the form. See Inner Exception Exception for details. The error was: Assembly with mixed mode was created with the runtime version v2.0.50727 and can not without additional configuration information loaded into the runtime version 4.0. In my program I use .NET4 tools (charts and dattimepicker dropdownboxes) but SQLite is compiled in .NET2.
So additional in VS2010 I added the "app.config" with the famous lines:
<startup useLegacyV2RuntimeActivationPolicy="true">
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0" />
</startup>
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How to create a non-unique index in sqlite?I'm using vb.net to create the tables.
View 1 RepliesI'm creating a VB.Net application that stores data in a SQLite backend. The data comes in excel workbooks that the user can import from. Each workbook has one worksheet (about 30,000 rows) that gets reformated a bit and imported to a new table. What's the most efficient way to do this?
I'm currently reading in the entire range from Excel into a 2D array. Looping over the rows in this array and adding each row to a long SQL statement that gets executed every thousand rows. But this is painfully slow both on the looping through the array bit and the pushing to the SQLite step.
Code below:
'First open the xls reformater book and read in our data
Dim xlApp As New Excel.Application
Dim xlWorkBook As Excel.Workbook
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