How can I fill this Percentage array with Sql data reader..
Dim StudentID As Integer = Me.ComboBox1.SelectedValue
Dim Percentage() As Integer
Dim con As New SqlConnection("Data Source=.SQLEXPRESS;AttachDbFilename=D:Database
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The code works fine, but I don't know if is necessary while sentence, maybe there is another option..
Dim CMD As New OleDb.OleDbCommand
CMD.Connection = otraConexion
CMD.CommandText = "SELECT * from procedencias"
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I have an SQL statement like:
SELECT FNAME, LNAME, CITY from EMPLOYEE
How do I create a multi-dimensional array from a datareader which should store values like:
John, Doe, LA
Mike, Johnson, PASADENA
Freddy, Kruger, Long Beach
i want to fill a Datatable with a Datareader row by row but get an exception because the reader's columns have a different order than the Datatable's columns.
Why and how does a Datatable loads itself with a Datareader correctly, even so it has a column collection with different order?
I need to calculate values for every row so i dont want to load the Datatable completely but row for row. It has 25 columns so i dont want to set it all manually.
There must be a chance to load/fill/add a new row from a datareader without having the same column order(reader.GetSchemaTable?).
Following is what i have but what doesnt work:
Using reader As System.Data.SqlClient.SqlDataReader = command.ExecuteReader
'next line works(configInfo.DataSource is a Datatable)but is inappropriate
configInfo.DataSource.Load(reader)
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I am using Window Application using VBNET2008, DataReader and TreeView
I am trying to use DATAREADER to fill the TreeView control during Runtime
I am using TreeView controls and having problem doing the coding as I have not done it before.
Listed beow are the SQL String and the result of it. And also the graphic drawing of TreeView display
SQL String :
SELECT
OrderID, OrderDate ProductID
FROM
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I'm woking in aprogram that read sms from phone and show them in datagrid.berfore I link the datagrid to the database it read the show the message fine in the datagrid but now it show Error message
the code for the form load Code:Dim con As OleDbConnection = New OleDbConnection("Provider=Microsoft.jet.oledb.4.0" & ";data source=" & Application.StartupPath & "SMS.mdb") Dim Mocmd As OleDbCommand = New OleDbCommand("Select * FROM TableMobinil", con) Dim myDA As OleDbDataAdapter = New OleDbDataAdapter(Mocmd) Dim myDataSet As DataSet = New DataSet()
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I want to fill an Array and list box from a table, with ALL of the records.
I DONT want to use Displaymember. Like shown below...
CODE:
This is the code so far, but it is only filling with the first record.
CODE:
my Code for fill datatable is :
n1.SelectCommand = New SqlCommand("Select Code from PriceDrystore where AirplanCode = '" & lblAPcode.Text & "' and substring(Code,8,1)='" & lblRoute.Text & "' ", DS)
n1.Fill(z1)result this code = 8 items
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I need to fill an array with whole column from database table, so i have used reader to read the values from that column, but can not figure out how to put them into array (code below doesn't work) [Code]
View 3 RepliesI want to load all of the LOCATIONS in the Location table to a Combobox and then for any found locations (in another table) to be deleted from that combobox. Im using a Array list, but can't get the Data reader to write to the Array list.
Dim SQL As String = ""
Dim Reader As OleDbDataReader
Dim i As Integer = 0
Dim LocationArray As ArrayList = Nothing
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How do I load data from a datatable into an array.
Dim
dtDataTable As New System.Data.DataTable
dtDataTable = dsStaffHoursWorked.vwGroupProjHoursDate
Dim DRs = dtDataTable.Select("enddate = '05/14/05'")
Got an array, why cant I save dataread info to array pos?
While myDataReader.Read()
' txtPhone.Text =
Tempstr(i) = myDataReader.Item("Phone").ToString + vbCrLf[code].....
apparently Object reference not set to an instance of an object.
I would like to retrieve a single column of about 800 rows in a table and save these values in an array so as to reference them later on. How can I do it? I tried:
[code]...
And it didn't work. The col1 is of type Int64 and so is the array prev_ob(). Please let me know how I can save it to an array.
I am not sure how to phrase my question properly but I want to achieve something like this.
I have a class named Products public class Products
private ID as Integer
private Name as String
Public Property ProductID()
Get
Return ID
[Code]...
When I do the same, I am getting an error "Object Reference Not Set to an Instance of an Object.
I am using a datareader to pull data from my database. I store the data in a multidimensional array in a seperate class file. I access the values in the array from a form through properties.The problem I am having is when I run the project as I step through the code I can see the values being added to the array but when access it from a string property it shows up as string System.String[,]. I would like to have my array transposed accross the listview under the corresponding column. below is the code I am using.
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I have a problem with my project. here is the problem:
My code for login is as follows:
dim conn as SqlConnection = New SqlConnection("Data Source.................)
dim cmd as SqlCommand = New SqlCommand("Loguser",conn)
cmd.CammandType = CommandType.StoredProcedure
[CODE]...
Now the error i get is that "there is a datareader associate with this connection that need to be closed"
I am working on a project which requires me to connect to a MySQL database. From there I query the database and need to do work on the returned values.
I can query the database just fine. However, now I need to do work on the results. The two columns returned are user_name and user_password. The rows are the user accounts. I would like to take my query results and put each column into its own arrary().
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Instead of writing the results to the console, I would like to write each column to an individual array. Is there an easier way to accomplish this task? Or, what is the code I must place within the loop to do this.
I want to build an array with info from an XML file.
The number of columns is static, but the rows will be increased once in awhile and I want one column to populate in a combobox while corrosponding selectedindex appears in a textbox. I think I can figure that part out, but currently stuck at the array building.[code...
I am doing the basic reading form one table,.it is opening the connection,no problems.i got 5 rows in Categories table with two columns .i got some data as well.using datareader i am trying to read the data.It is not going into while loop
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I m trying to use two datareader in same loop but its not working. Here is the error and code below Error line: DR1 = MyCommand.ExecuteReader()Error message: There is already an open DataReader associated with this Command which must be closed first.
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I've made a program that calculates the costs of a transport, wich to my own surprice works. Because the prices vary with the weight of the transport, extra services and delivery within the 3 countries of the Benelux (Belgium, The Netherlands and Luxemburg), I use an array. The array is filled with data from a textfile (in this case not *.txt but *.prc). The data in the datafile is presented as follows :
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I have a TextBox column in my DataGridView. When the user clicks one of the cells in the column I turn that cell into a DataGridViewComboBoxCell and fill the items using the columns Tag property which is a 1-dimensional array with 3 items. This is what my Tag looks like:
?CType(sender, DataGridView).Columns(e.ColumnIndex).Tag
{System.Array}
(0): ""
(1): "No Reportable Result"
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[code]I am facing difficulty in coding when intRow loop for the 2nd round. Error message "There is already an open DataReader associated with this Command which must be closed " appear in the above red highlight vb.net code.
View 6 RepliesI use firebird server for 2 years and I used this code
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This is some of my code. But how do I populate a datagridview using the datareader.
Dim strSQL As String = "SELECT peopleid,firstnames,surname FROM people;"
Dim cmd As New MySqlCommand(strSQL, con)
'cmd.Parameters.AddWithValue("Parameter1", strName)
Dim reader As MySqlDataReader = cmd.ExecuteReader
and how can I handle null field values.
I am trying to port a program I wrote with old VB 1 and I have many control arrays in the program, and it was so easy to do this in older versions of VB, now I am trying to find how to do this and all the answers I have found are a major productions, to replace something that was so easy to do? I would think that microsoft would make programming easer with each new incarnation. instead they are making it harder. doing away with the DATA and READ statement, now it is much harder to fill an array with a loop, now you have to enter each item in an array ONE by ONE. they did away with the ON statement, I had several ON statements, I had to make complex Select case constructs. to replace a simple one word statement?
To make an array of controls in OldVB all you had to do is Name a Second control the Same as the First, and a dialog pops up and ask if you want to make an array, you click Yes, and that's it, what could be easier than this?
I have been told that the best way to do a search in VB is to fill an array with ALL the records from a table in a database and then filter the records from the array, instead of using the SQL statement Where.
View 25 Repliesthis is my code
Dim str As String = "str1,str2"
Dim array() As String = str.Split(",")
Dim MyListOfTextBoxes() As TextBox = {TextBox1, TextBox2, TextBox3}
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i have 5 textboxes. i want to fill just textbox1 and textbox2 with array value. because no i have to word.but when i run the code "str1" repetition on textbox1,textbox2 and textbox3.
I have a series of checkboxes named cbS1 through cbS20 and I set 'Count' as an integer.What I need help doing is taking the value of count and check the checkboxes that are greater than the count.example: count = 7 so checkboxes 8-20 would be checked.Im not sure how to make an array out of the checkboxes to use in a loop.
View 1 Repliesis it possible to fill up a 3 column ListView with an array.
View 5 Replies