VS2010 MySqlException Was Unhandled - Pass Information From A VB Form To MySQL Database
Jun 8, 2011
I am trying to pass some information from a VB form to my MySQL database. i have named all the textbox's the same as the field in the database and checked all my database fields and textbox names which are all correct. When i try to enter information into a form I sometimes get an error at the .executeNonQuery section of the code.
To test, I outputted the SQLStatement string to a textbox ( which pulled through all the fields from the textboxes correctly) then manually inputted the completed SQL query into the database and it worked. But when I try to do this in one go it seems to fail if there is too much text ( if i enter 'a' into each field it works). Are they limits to the size of the SQL query that can be passed from VB?? all the MySql database fields are set to text with no size limits.
i have a form that I need to do two separate functions, however about 95% of the code is the same it's just that last 5% so I don't want to create two forms. What I would like to do is when I click on a button to open the form pass it a variable or something so I can determine which of the two buttons were used to open the form.
Basically if Button1 is clicked do this if button2 was clicked do that...
I'm wondering if I create a program that connects to a mysql database, will they be able to decompile it and do anything with the mysql connection information?
Currently I have been using mysql connectors to send and retreive information from my database. Someone suggested that a web service (wdsl? etc) would be a more efficient way of sending information both ways.
I've followed a guide as to how I connect a form to mysql as per: Private Sub Form1_Load(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles MyBase.Load TestConnection() End Sub Public Sub TestConnection() [Code] ..... And when I launch the form I get the error "unable to connect to the specified hosts".
I am wondering how I would get the information on what errors get processed by the application.unhandledexception. I already handle the event and gather the information, but I am unsure how or what the best way to get that information to me (the developer).
So far I have vdialog that asks the user if he/she wants to send the error to me, kind of like when an error occurs in Windows XP and a dialog asks the user if they would like to send information about the error to microsoft. I am unsure what to do when the user clicks "Send".
I have thought about emailing to me, but I don't really want to put my email address as the from, because I might change it or its password in the future, thus breaking its usability.
I cannot yet do an anonymous FTP upload, because my website only allows one FTP user, and that is used only to update the website.
I also have thought about using the user's default email program, but that will not work in most cases of people who rely on web mail.
My app connects my server with Mysql.data adapter. most of time it works great but sometimes i get unhandled exception. i am really tired of getting this
I am having and issue with showing my database in another form. It works fine if I have it display in the current form but this is not what I want. I want to connect to the database and then have it show my query in a second form. If you don't get me here's my code.
CODE:
And then the code in form 2 is
CODE:
It comes to the error when it gets to "ContactsAdapter.Fill(ContactsData)".
How to Connect an MySQL to VB8 Form to access File from database I used several codes but connection is not establishing have to connect VB form button by click it connect to database in C# code so Help me to connect for database in C# source code
I m creating a Log In form at VB.NET and i have some problems The connection between the application and the web server opens fine and i can login if i use the MD5 encrypted text of the database.
I have a fair bit of experience with VB.NET and C# (In this case I chose VB.NET, blame my laziness), but I do most of my professional work using PHP. I have no experience what so ever in using any database with VB.NET let alone MySQL.Just FYI, at the moment I am only trying to Query the database to gather the information required to activate. The Activation wizard and algorithm building (which is finished anyway), and everything else will come soon. I chose the MySQL database because I have experience with it, and it seems the best option for remote usage.The whole idea already works in PHP, I'm just have major issues moving it accross into VB.NET (Using the MySQL Connector.NET);I understand the basics, and all I need to know how to do is Count Rows and gain access to the other information in a row based on provoided information (in PHP, through mysql_ result)
So, here goes nothing, this is the Query code I am using in PHP to complete the job I want to do in VB.NET. [code] As you can see, I basically need to get the PHP code into VB.NET to fit into the 'btnQueryDB.Click' Command in VB.NET. By Equivalent, the Product ID in VB.NET will come from 'txtPID' and similar, Serial Number will come from txtSNUM. Once counted to be 1, the Activation Code and Status will be fed into 2 other text boxes in the form. (acCode, and acStatus).
I have a checked listbox which is populated with names(firstname & Surname), I also have a form that has been designed (layoutwise but with no code) to be populated with personal info such as name address,postcode,email address, sql database defined in the program that has a table called members that has the same column headings as the members form.
What i am trying to figure out is how i can commit personal information on my form to that database and copy the firstname and surname from that form to the checklist box if they dont exist? how do i go about this codewise?
I have a winforms application connected to Mysql using the.Net driver. I written a class to handle to all the database functionality. I use a dataTable to store query results for binding from mysql.
Imports MySql.Data.MySqlClient Imports System.IO Public Class MysqlConSjC[code]......
This method does a select query. How would I write a method to insert/update/delete rows of the DataTable in the database?
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]......
The program is currently trying to pull information from three different database tables and compiling the information onto one screen, to do this i am using three different connections and a function to handle the data at each stage. The issue is as my code hits PageLoadStage of "2" and runs the QueryDatabase() Function i am encountering an error of: "OleDB exception unhandled: No value given for one or more of the required parameters." This occurs on line 15 of the first code snippet. Can anyone explain this and/or identify any code issues if that is the cause.
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()
I am making a download manager in VB 2010. I need to be able to pass the download link from an HTML page to the VB Application. This is what i think i need to do in the HTML:
I have the following VB code.Dim cmd As New MySqlCommand("SELECT code FROM decoder WHERE ann_id = @aid", conn) cmd.Parameters.AddWithValue("@aid", 1)Dim reader As MySqlDataReader = cmd.ExecuteReader()
The reader.Read() then gives me nothing, however, if I replace the code by.Dim cmd As New MySqlCommand("SELECT code FROM decoder WHERE ann_id = 1", conn) Dim reader As MySqlDataReader = cmd.ExecuteReader() reader.Read() gives the correct result. Tried using Add instead, doesn't help. What am I missing here?
I'm just starting out with vb and am working on a single form project.
Basically I'm trying to take information entered in a textbox on the main forum, Appear in a tab control at the bottom of the forum through the use of a button.
As far as I can tell, I need to code the onclick button portion of it but am unsure about how to pass the information to the specific label in the tab control.
