MySQL Database Update - Slow With Multiple Lines

Mar 29, 2011

I am using VB.NET with a MySQL database. I want to update this code to do it all in ONE SQL instead of THREE. Here's the code I'm using, works fine but too slow with multiple lines...
If count3 = "1" Then
Dim myCommand As New MySqlCommand
Dim myAdapter As New MySqlDataAdapter
Dim SQL As String
myCommand.Connection = conn
[Code] .....

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MySQL Update Dataset With Multiple Tables - Close?

Nov 7, 2010

I've been working with a remote mysql database. The design of the database pretty much requires that I use SELECT commands that include multiple tables, and sometimes joins. Updating a single table query is SO EASY, yet dealing with multiple tables has me pulling my hair out.


What's killing me is that if I make a change to a field in the products table in the datagridview and press button1, the changes are saved. If I make a change to a field in the specials table in the datagridview and press button2, the changes are saved. If I combine the two updates together in a single routine, only the first one is saved. I presume this is because after the first update executes, the dataadapter no longer reports that there are any changes to save, since the update already happened.

I've tried breaking this up into separate dataadapters for each table, but then even using dataset relations, I can't get the data together in a single datagridview. On top of that, the grid itself is only intended to be used for searching and querying data. It still needs to be bound along with a set of textboxes that accept the input.

Lastly, this database is part of an ever-evolving website database with dozens of tables that need interfacing. I just can't see manually maintaining hand written sql statements for every table. That's why I've been working so hard to get the commandbuilder to handle it.

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Nothing Happens When Update MySQL Database

Aug 27, 2011

Ok so I have a Mysql dsetup called in-out and I have written a client program to get information from the table in the database, display it in a data grid view, and then allow to user to edit this information and update it on the server. Right now I am hosting the server on my Gateway laptop and also connecting to it from the same laptop therefore I'm using localhost as the server name. My problem is that when I go into the program and change the information and click update, nothing happens... the information stays the same yet there is no sign of an error, syntax failure, or program crash.

I've tried running this on another computer in my house and i get the same results. I can access the information without a hitch but updating it is where I run into trouble. If there was a problem with my code it would have displayed some sort of error or asked me to debug my script, which would have made it a lot easier to solve, therefore i am certain that it has something to do with my database. Before I got to this step, i kept getting an error when retrieving the information that said something like


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Update Mysql Database

Sep 22, 2009

I have been trying to update my database I only receive a msg box replyng that my msg is successfull updated but when i check my database no data is being saved!

here is my code for update


Here is my changePassword button code where I call the method UpdateDB:[b]


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MySQL Database Multiple Selections

May 31, 2010

I'm using this code to select all the IDs from the mysql database:[code]The command will return all the names. How can i process each one individually ?

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VS 2010 Only Update Specific Row For Logged In User [MYSQL Database]?

May 24, 2012

My program connects to a Mysql Database. It allow registration and login. I Need this to update the "BankACCid" column(?) in Mysql for the current logged in user.This is the code that doesn't work

MySql Connection
Dim conn As MySqlConnection
conn = New MySqlConnection()


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Insert, Delete, Update And Search Data In Vb 2008 Using Mysql Database?

Jun 9, 2011

how to add, insert, delete and search data in vb 2008 using mysql databases.

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2008 Count Lines In Textbox With Multiple Lines Using Label To Display The Numbers?

Sep 3, 2009

how to count the lines in textbox1.text (with multiplelines). I don't need to count each character. I only need to count each line from top to bottom in textbox1.text (multiplelines) and I will use Label1 to display the numbers.



Obviously this is 5 lines and that's what I need to count.

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Update Multiple Records In A Database?

Feb 6, 2012

How can I update multiple records in a database using one Update statement where the cases are different.

refundNumber = CASE _
WHEN salesRecords.invNo='1' AND itemNo='250' AND length(refundNumber) > 1 THEN _
concat(refundNumber, ', 88' ) Else '88' _


How could I translate this to an SQL CASE string?

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Insert, Update Multiple Row From Listview To Database?

Jun 19, 2012

right now i'm trying to google some related article about LINQ to better understand it. But I came across with this issue been googling to find some answer but I didn't get lucky so here my problem.

For Each lvItem As ListViewItem In lv_orderlist.Items
passSQL = "INSERT INTO t_selling_history (f_product_id_fk, f_qty, f_qty, f_user_id_fk, f_created_dt, f_trans_status)" _


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Update Database Records Using Multiple Threads

May 27, 2012

Been a while since I did any VB work, and have started a new project that is a Windows Service that will update a database using multiple threads. I am testing this out with a dataset that consists of a "device name" and a "device IP", pinging the device, and attempting to update the device's "status".

I have it working in a single-thread type configuration, but would like to be able to ping and update different records across multiple threads (for obvious reasons).

The problem I'm having is with the logic mainly. When the service is started, I get all the devices from the database and fill a DataSet. From there, I am looping through the dataset's rows, pinging each device and updating the record. I know how to spawn multiple threads, but I do not know how to keep track of updating the correct record and also making sure that all records are checked in some kind of order. Like, if user specifies 5 threads, I need it to get record 1, thread finishes, gets record 6 (while other threads execute), or something like that.

Note: this does no interface updating or anything like that. Only updates a database record's field value.

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[2005] Update Multiple Records To Sql Database?

Mar 13, 2009

i have 3 user roles "ALGEMEEN,OZIS,VERPLEEGKUNDIGE".And I want them added to the database.But when I use the code below it only adds the userrole "ALGEMEEN" and not the other 2.

Dim cmdCheckLidVan As New SqlCommand("SELECT COUNT(*) FROM [Lid van] WHERE [Gebruikers-ID] = @ID AND [Rol-ID] = @RolID", connection)
Dim strRolArrCount As Integer
Dim strRolArr() As String


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MySql Login - Lines Above To Login By Database - Error: "Incorrect Fields"

Jul 26, 2010

I have the lines above to login by database. However, I really don't know why always give me the error: "Incorrect fields". I am 120% sure that all the fields of the table are right, including the text that I put into my textboxs. I have already add a user into the database. I can make login in PHP but in VB.NET I just can't.

Dim MySQLConnection As New MySqlConnection("server=localhost; user id=root; password=; database=DB")
Dim MySQLQuery As String = "SELECT * FROM TableLogin WHERE Username = @username AND Password = @password"


I already tried to show the data of the database into a Datagridview and it works fine, it displays to me all the rows that I had add in the database.

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VS 2010 MYSQL - Add Info To Database User Informations Using Mysql Database

May 1, 2011

How connect Vb.Net to MYSQL..? How to add info to database user informations using mysql database. How to call login infos using mysql.

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Update Dataset Table With Mysql Database Table?

May 22, 2011

How can I update local dataset with mysql database without making duplicates. Assuming I set some column in mysql as primary key, which has unique string.

adapter.fill will just add duplicates, but adapter.clear before that is not an option.

So I want to update if the key column is the same with mysql data and if there is option for ignore adding new row.

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Update MySQL DatabaseThrough Datagridview Update Command?

May 25, 2010

I have been on a database project for a while now. I wanted to be able to make changes to my database using the update command of a Datagridview control.However, I have been faced with a series of unsuccessful outcomes.I want to do this how do I go about it?


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MS Access Table Update Extremely Slow?

Apr 6, 2009

I have looked all over for a solution to this problem and have tried a bunch of different things, but nothing seems to work.I have a sub procedure that does the following:

1) adds two columns to a data table (table1)

2) fills a dataset with several tables in order to make calculations (this determines the data that will be stored in the two new columns of table1)

3) updates ONLY table1, and ONLY the two columns that have just been added (these columns are thus empty for every row before the update begins)

As it is now, the da.Update takes about 3 hours to populate the entire table (it updates about 300 records per MINUTE if I'm lucky). There are approximately 40000 records in table1 for this test subset, but there will eventually be up to 1.5-2 million (in other words, this is a small table currently). I have tried using executenonquery() along with a sql UPDATE command instead of da.Update, as well as many other things, but none of them has improved performance at all. I've also tested it on two PCs, one running Vista and one XP, and there were no differences. I'm using Access 2003. I know Access is not ideal, but for now it is the only option.

I know that the root of this is the line of code with the da.Update, because the giant loop before it that I previously thought was causing the slowdown executes in 30 seconds, leaving only the update before the subroutine is complete. I don't know how exactly the da.Update works, but I've suspected that maybe it has something to do with that? Code is below:


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VS 2010 Serial Read And GUI Update Is Slow?

Jun 17, 2010

I`m trying to write a small program which connects to a serial port at 115kbps and reads a stream of continuous bytes from a microcontroller. The program should then graph these bytes by time. Ideally this all happens in "real time" and as quickly as they can be sent.With a 50ms serial write delay on the micro the VB program keeps up fine, but if I lower the delay any further, say down to 1ms, the update can`t keep up and the serial buffer just grows.I wasn`t expecting the bottleneck to be the PC side so it`s likely my code is doing something wasteful. Or maybe it`s the graphics which are drawing slow?

Private Sub DrawGraph()
Dim y As Integer = m_Y


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Store Picture As BLOB In MySQL Database And Retrieve From MySQL Db Directly Into Picturebox ?

Apr 11, 2011

I have determined thanks to the last q & a that there is something wrong with my "save to db" code as well as my "retrieve to picture" code. Even If I manually save the pic in the db it stil wont retreive. This is code i patched together from 3 or 4 examples around the net.

Dim filename As String = txtName.Text + ".jpg"
Dim FileSize As UInt32
Dim ImageStream As System.IO.MemoryStream[code]......

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.net - Graphics.drawString - Draw String In Multiple Lines And Know How Many Lines Given String Will Take

Aug 26, 2011

I want to draw string in multiple lines and and I want to know how many lines given string will take. I am using following method.


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Make A Login System Mysql Try To Connect To A Mysql Database?

May 3, 2010

I am trying to make a login system mysql try to connect to a mysql database.

Here is my code:

Imports MySql.Data.MySqlClient
Public Class LoginForm1
Dim MySqlConnection As MySqlConnection
Private Sub OK_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles OK.Click
MySqlConnection = New MySqlConnection()


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Mysql Database Connect With Mysql-connector-net

Jan 30, 2011

I can have mysql database. but i have not mysql. how to connect this database 2005. but i have mysql-connector-net . I want to mysql-connector-net use to connect this database. database path(C:Documents and SettingsAdminMy DocumentsVB.NETStock delnaSTC.sql)

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VS 2005 - Loading From A Database - Too Slow

May 6, 2009

I've got a database that's 13,000 lines long and I'm trying to load this into a string array when the program loads but it takes approx 5-6 minutes for it to load it.I've got a MS Access database or an Excel file that I can load this information from, each has two rows: SVONo, Description This is my current MS Access


Does anyone have any idea of how to make it faster? Or does anyone have a better way?I did have the idea of loading it by letting the user select the first letter and then only loading the ones that begin with that letter but I've got 4000-5000 'S' ones and it still takes about 2-3 minutes to load it All I want is to load the data from the database or the excel file and then put the products into 'cboProducts' and the 'cboProducts AutoCompleSourceList' and the descriptions into the 'txtDescriptions' AutoCompleteSourceList and a string array.Then when the user selects a product using 'cboProducts' the description will automatically be put into 'txtDescription'.

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.net - How To Combine Multiple Lines Into One

Nov 4, 2010

I am trying to figure out a way of combining the below Dim statements into one line and maybe also combining Return dblResult into there. currently it is three lines and I have been told that it is possible but kind of lost of how to do it


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Get The Lines To Change Their Locations But The DragHandle Rectangles Won't Update?

Feb 23, 2010

I am able to get the lines to change their locations, but the dragHandle rectangles won't update - they stay at their starting locations. I would have thought since the points list changed the updateLinehandles() would fix it.

Friend Class Line
#Region " Variables "
Public p1 As Point
Public p2 As Point


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MySQL Update On Form Load

Feb 5, 2012

I have a program, that on form load, updates a value. The problem is, that it doesn't work!

Imports MySql.Data.MySqlClient
Public Class Form1
Dim MysqlConn As MySqlConnection
Dim UserCommand As New MySqlCommand
Dim SQL As String
[Code] .....

And the problem is that it doesn't update the points. I set the points to 10 via PHPmyadmin, and run the program, but when i go back to PHPmyadmin, its still 10.

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Search And Update Record Mysql In Vb?

Apr 18, 2012

i have problem to search and update record database sql. this is my code. i using mysql database and Microsoft Visual Basic 2008


but i have error on Word command.ExecuteNonQuery(): MySqlException was unhandled. There is already an open DataReader associated with this Connection which must be closed first

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Update MySQL Field In Program?

Feb 26, 2011

I am trying to update a field in my MySQL database using VB.NET.....

Basically, I can read the field's content, using this code:

SQL = "SELECT * FROM `boomtable` WHERE `Tab1` = 'CLOSED'"

However, I want to update the Tab1 field to have the value OPEN if it's currently closed, and make the value CLOSED if it's currently OPEN.. Right now, it's CLOSED, (I put the value in manually when making my table)

Here is the code I'm using that changes my label based on the Tab1 field's value that works fine... Except I want to actually make it update the field in the database in addition to changing the label text.[code]...

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Update Mysql From Dataset/datatable?

Apr 20, 2011

I am trying to update mysql table from a txt file using So far I've found code here and there and been able to extract the data from the txt file, now my question is how to update mysql from the same dataset or xml file. Here is my code to populate the datagrid/dataset/xml file.what is the easiest way to update mysql assuming "Orden" is my primary key in mysql.

OpenFileDialog1.Filter = "Text File|*.txt"
OpenFileDialog1.Title = "Open File..."
OpenFileDialog1.FileName = "trackings"


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Update MYSQL Table With Datagridview

Mar 11, 2010

I Use visual Basic 8.0 and Mysql 5.0 I have one Table1:


I want to use Datagridview to update Mysql table1. All changes as update, change, delete automatically processed into Mysql table1. Here by my code


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