I seem to be having a heck of a time trying to figure out how to add the results from a mySQL query to an array in vb.net. Right now, I only understand that you have to define the dimension of the array, however this is shy of impossible since the dimension of the array will change due to different results from the query. What is the proper way to take my results and put them in an array?
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I am finding it exceptionally difficult to pass an sql query result (string) into a variable.No matter what I try, I can't seem to get anything but boolean output from my reader function.I need to obtain staff "account type" from my staff table and then define that account type in a variable.
View 1 RepliesI have a project in Visual Studio 2008 and there is a working data connection to a MySQL database. In other words, I can query the db directly from Visual Studio and it will display the results.
I've tried a couple of approaches that I found online for writing a connection string and accessing the db, but no luck yet.
All I'm trying to do is code a button to query the db and then reset the text property of a label/textbox to display the results based upon another label/textbox value.
The pseudo-code I am imagining is something like this:
Private Sub query_submit_button_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles query_submit_button.Click
result_textbox.Text = SELECT field FROM table WHERE otherfield = key_textbox.Text
End Sub
I didn't see any related questions posted on SO - forgive me if I missed one that already exists and this is a dupe.
What is the correct way to accomplish this?
EDIT
Using MySQL 5.1
I have a query that returns Lname, Fname, and Email. I want to send 1 email (that Is already set up and working) that contains the results of the query as part of the body that includes an additional message; "The persons listed below.........." Need to know how to get them "listed below". Then I want to send a separate e-mail to each email address the query returns, separately not in a group but the same message.
View 19 RepliesI had done this by using the query builder (in VS Studio) but soon found out thay I gain no points by doing it this way as I am not using any code. I have tried to adapt the code I had to insert data into my database, just changing the SQL sintaxa and some other bits, but it is not working yet. Well, it gives results, but I think it is still geting the results from the query I had built using the query builder. Here is the code I've got so far:
Public Class Form2
Private Sub btn_search_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn_search.Click
Dim str_search As String = txt_search.Text
Dim str_dob As String = txt_dob.Text
[code]....
I am trying to to an insert query on my MySql db using VS 2008/VB. I have this query: Insert into allservices StartDate....) values ('" & Me.datesched.Value & "', ....) When I use the single and double quotes, as it is above , I get this error: Quote: Incorrect date value '21/10/2009' for column StartDate at row 1
when I remove the single quotes and have only the double ones I get a completely different thing. The date inserted to the database is 01/01/0001. Even if my datetimepicker has a min and max date. Also if someone has any good links on using mysql with vb.net
My DATE field always display with time in vb.net is there a select query to format it into yyyy-MM-dd?
View 3 Replieshow to take a query that returns a single row of data and load that data into textbox controls.I know about ExecuteScalar but it is only good for a single column of data from the query.
View 2 Repliesi am about develop an application and i want to do the following.
1. use vb.net 2008 for the application
2. use mysql database as the database for the application
Question:
1. is it possible to package the application by adding the mysql database so that during deployment it will be installed as well eg. vb.net 2008 and access database can be attached and deployed without installing any file to support
I have a query from within my vb.net code which searchs for a record by date. The date being entered via the code is in format dd/mm/yyyy, i need to search in the database using yyyy/mm/dd? Ideally i thought there may just be a function within MySQL which will convert this. If not in vb.net to convert the string 01/01/2011 to 2011/01/01?
View 1 RepliesI've added a COM reference to one of my projects (the DLL resides in C:Program FilesIntwerwovenWorksiteiManage.dll) but when I view the References in my project the path is something like c:usersusernamedocumentsvisual studio 2008project nameobjdebugiManage.dll..I seem unable to edit this path. I can remove the reference and re-add it using the browse button, picking up the correct dll but it keeps showing as the path of the project.The application works on my development machine but as soon as it's deployed to a client machine it complains of the missing DLL. Of course, the DLL is present but the app is looking in the debug folder.
View 13 RepliesI am trying to set up a query to return data to a VB.Net datagrid. I want to rollup the results into a new column kinda like below:[code]I tried using "group_concat" but for some reason it rolled up the entire list on teams into a column regardless of match_no.[code]
View 2 RepliesThe following sql call works fine, returns the correct total retail for customers:
SELECT customer.id,
customer.first_name,
customer.last_name,
[Code].....
I have a table adaptor that pulls from the sql database, when I edit the table adaptor query it makes this specific table adaptor not a part of the dataset. I have added a column to my database which will contain an integer, when I try to add this column to the query this error occurs, i am using the configure area of the table adaptor.
Error 'AuditProductsTableAdapter' is not a member of 'MemKingClient.MemKingDataSetTableAdapters.TableAdapterManager'.
I have an array set up as follow Dim MyOptions() As String. i want to loop through a xml file adding each value to this array, how can I add to the array on each loop?
View 1 RepliesI have a datagrid control with a list of names that it retrieves from a MySql database. I can search through them until i have one result. I want to be able to Display a groupbox control when the number of results is equal to 1. Also, in the groupbox i have a button that when clicked will delete this user from the server and their information from the mysql table called "employee". when the user is deleted i'll display a confirmation message in a messagebox, and reload the table with the updated list. so far the only two problems i have are showing the groupbox when the results are equal to 1 and deleting the user from the sql server based on the name of the search result
Private Sub TextBox1_KeyUp(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles TextBox1.KeyUp
'Search Function.
[code].....
Scenario: Writing a scanning program, thing is I can't have duplicate file names(which I generate). The img file paths r saved in a database.I'm trying to write a function that will return all the records I need using a SQL SELECT. To make this work I need to put all the retrieved records(just the one field from the database) into an array.My Problem: I have no idea how to put the retrieved SQL query into an array and then return it.
Private Function fileNameAcquisition(ByVal path As String, ByVal id As Integer) As String
Dim conn As New SqlConnection
Dim dr As SqlDataReader
[code].....
I have setup an OleDbConnection and my query works just fine but the problem I am facing is that I want the entire query not just a certain row or column. I also would like to place this entire query into a blank excel spread sheet.[code]
View 1 RepliesI have this
Dim oLanguages As SortedList = Languages() 'Languages() is my custom Function
Dim oLanguageMenu(oLanguages.Count) As ToolStripMenuItem
For n As Integer = 0 To oLanguages.Count - 1
[Code]....
The last line produces an error: "value cannot be null. Parameter name: value".
have another problem regarding with time again. After getting a user input time in "H:mm", in what way can I add like an additional 15 minutes to it? Something like this:
1 - User inputs the time in textbox
2 - Adding 15 mins(which is in an array) to the time
[Code]...
If this is in the wrong section, I have a program that queries a database and puts the info in a specific format in a txt file. Now my problem comes w/ how to format the date.
Should I format the date in the SQL query OR is there a way to take the result from the query and format sometime before it is writen to the txt file? I'm not exactly sure how to do either. Would I need a subquery to get the desired date format?
[Code]...
I am using an access DB and wanted to create a query that returns user's in the db. First I need to check the db to see if it is empty. Then I need to check to see it my query returned any values. How do I go about doing this?
View 6 RepliesI'm a bit confused on how to grab query results. With VBA i would open a record set and have the results of the query written to that recordset. IN VB.net how can I grab the query result and throw each column into specfic arrays?[code]Now how would I force it to query my DB? I have a connection established already.After the query how can i play with the columnes and place them into arrays?
View 2 RepliesI have used linq quite abit but was just wondering how to append the results of two IEnumerable(of X) together into one IEnumerable(of X)
View 4 RepliesI had this query sp_msforeachdb 'select "?" AS db, * from [?].sys.tables' when I execute it in sql server, it return multiple results. How I can read all the results in my vb?
View 2 RepliesI have the following code in my program: Dim empenrollments = From enroll In db.EnrollmentSummary(eid)
Select New With {.Name = ename, enroll} Dim elist = empenrollments.ToList returns this error
In the following lines, I have to get each row in the returned results and add it to a DataTable, but it never gets there.
[Code]...
I am familiar with the VB6 ADO way of dealing with SQL queries and looping through the record set results.
However, what is the correct way to query a server, cycle through the results, and dispose of my query in VB.Net? All the ways I have been using seem to be unstable and crash randomly.
I have been using the following code:
Public Function GetSQLTable(ByVal strSQL As String) As DataTable
Dim table As New DataTable
Dim adapt As SqlDataAdapter
[Code].....
I am learning VB.NET and wanted to try and connect to a Oracle.DataAccess with this simple SQL Query but am stuck how to get my results.
Imports Oracle.DataAccess.Client
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click[code].....
I'm trying to get the results of a WMI to display in a datagrid however the code executes without error yet the datagrid doesnt show any output
Try
Dim scope As New ManagementScope("\" & servername & "
ootMicrosoftDFS")
[code].....
I'm trying to execute a SQL query and pull the results into a text file. However, I'm getting an error in the bolded part. I think probably the biggest help would be an explaination of what the code in bold is actually doing. I pulled this from a book but don't think I completely understand. To me it seems like its saying that for each row in table 'extract'. Extract it, and write it?? But it doesn't seem to work that way. When it gets to that part, the error I get says that the row doesn't exist in the table
Private Sub btnExecute_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnExecute.Click
Cursor.Current = Cursors.WaitCursor 'hourglass cursor
Dim connection As New SqlConnection
[code]....
