Access To DataTable From Other Form?
Jul 17, 2010
i have 2 forms. In form1, I created a dataTable with 10 rows of data to be display in Form2. However, when in Form2, I can see all the info. But when i created an button to count the number of rows, it return 0 where there is obviously 10. I understand that in Form2, in order to count the table, i have to create a new variable for DataTable. And this variable in Form2 is actually create a new dataTable. is there a way for me to access the same dataTable that is created in Form1 in Form2?
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Jul 28, 2010
I have a DataSet(dssongs) with a DataTable(dtsongs) on a form(songsForm).
I am adding rows to the dataTable using the following
Dim dr As DataRow = songsForm.dtSongs.NewRow
dr.Item("colSongFile") = file
dr.Item("colSongTitle") = ""
[Code]....
How do I refer to a DataTable on another form?
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Apr 11, 2011
my form have a datafridview to display my datatable in my access database. and my database have 3 tables.in my database have "computer","booking status"," reservation" and this 3 tables are link together. which my parent table is "computer", then we can level in then we can see the "booking status", and then we can level in and see the "reservation"
so now i have a problem of this. i want to show them in a relationship view (or should i said it as parent and child relationship) just like we view in access database. can it be done? if can how i gonna do it. and how i gonna code for that?
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Dec 15, 2011
created a small application that I'm able to add items from an access DB to a ataGridView.Now, My questions is: suppose that I have a list of item in this DGV,containing name and Quantity. Now I would like the database to be updated with new values on Quantity column, something lke this: (Current values - Quantity on DGV).
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Jun 13, 2011
Way to access datatable rows
[code]...
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Feb 10, 2009
I am trying to add data to a access datatable column I am using a richttextbox to fill in any data but when i save it to a column in a database and if there are more chars then 255 then i get an error (try to enter more then column lenght) anything under 255 is working fine the column in access = type of 'MEMO' so no limited to 255 it's the hystory to send that is giving me the problem
Dim history_to_send As String
Dim day_to_send As Date
Dim ID_to_send As Integer
[Code]....
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Mar 3, 2010
I have a database in .ACCDB format with some tables.
I'm successfully loading it into an OleDbDataReader with the following code:
string connectionString = "Provider=Microsoft.ACE.OLEDB.12.0;data source=C:\marcelo.accdb";
OleDbConnection conn = new OleDbConnection(connectionString);
[Code].....
I'd like to load the table "clientes" to a datatable instead. How should I do it ?
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May 30, 2012
I have an Access Database "WPS" with a datasheet "CompartmentDescription" having "CompartmentName" as one of the columns. I want to use each element of the column. How do we retrieve the data Using "For Each" loop.
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May 26, 2011
I've been perusing some hep forums and some help books but cant seem to get my head wrapped around this. My task is to read data from two text files and then load that data into an existing MS Access 2007 database. So here is what i'm trying to do:
Read data from first text file and for every line of data add data to a DataTable using CarID as my unique field. Read data from second text file and look for existing CarID in DataTable if exists update that row. If it doesnt exist add a new row. once im done push the contents of the DataTable to the database.
What i have so far:
Dim sSQL As String = "SELECT * FROM tblCars"
Dim da As New OleDb.OleDbDataAdapter(sSQL, conn)
Dim ds As New DataSet
[Code].....
In constructing my table i use "SELECT * FROM tblCars" but what if that table has millions of records already. Is that not a waste of resources? Should i be trying something different if i want to update with new records?
Once Im done with the first text file i then go to my next text file. Whats the best approach here: To First look for an existing record based on CarNum or to create a second table and then merge the two at the end?
Finally when the DataTable is done being populated and im pushing it to the database i want to make sure that if records already exist with three primary fields (DriveDate, DCode, and CarNum) that they get updated with new fields and if it doesn't exist then those records get appended. Is that possible with my process?
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Jun 4, 2009
I've been browsing these forums for a day looking for the answer to this, so far nthing has fitted.I've got an access 2000-2003 database containing a whole pile of data for a VB coded application to use. One of the tables in the database needs to be able to be updated with data from the application.The new data is stored in the app as a datatable. I need to replace the original table in the Access file with the datatable in the App.
I'm changing as many as 60 values at a time, so defining these as parameters in an OleDbCommand would be impractical and frankly ridiculous.
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Oct 11, 2009
Is it possible to edit/get data from a DataTable from another thread? On one form, I'm declaring a DataTable and loading it with some data. On the same form, I have a sub wich does some updates to the DataTable.
Now, I want to call that sub from another thread, but it seems like an impossible task... When I for example do a 'for each' in the sub wich updates the DataTable, it doesn't actually refer to the DataTable. All the rows and columns are not there.
I've been reading about some cross-threading and found some example where the objects invoke-property is used. But the DataTable does not have a invoke-property. So, how is it possible to do what I'm trying to do? I've been searching the forum/web for a while now, but maybe someone here can point me in the right direction?
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Sep 15, 2010
This is what I'm trying...
Dim myCommand as SqlCommand
Dim myTable as New xsdObject.ObjectDataTable
myCommand = DataAccess.GetSQLCommand( "MyStoredProc", _
[code]....
'How to access my data ?
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Apr 16, 2010
I'm having some trouble trying to export a datatable to Access. I've built an Access DB and Table identical to the datatable that I'm trying to export using ADOX.Now using and OLEDB connection I'm trying to populate that table. The following code works just fine in another app written in 2005 but not in 2008 for some reason.
Basically I'm bringing in the empty Access table into a dataset.Filling that table with the rows from the export datatable.Then running the dataadapter's update method to send the data to Access.The problem is the da_a.Update doesn't seem to work. No errors, the Access table just isn't being populated. I checked my before and after counts. I know that the datatable is being populated. It's just not landing in Access.
Dim conn_a As New OleDb.OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & strFullFileName)
conn_a.Open()
'Select Access Table into new Dataset[code]....
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Jan 10, 2011
I am a veteran programmer . However , I am new to visual basic 2010 . I am trying to create a database that ould store data within an access file *.mdb .I have created the database which includes multiple tables . moreover i have created app.config file using wizard and my database along with dataset appear in the visual basic 2010 project . moreover when i test the function insert in the dataset the function performs well and the output is correct and i can see the new row added in my access database . however when i try to use the ATLtableadapter.insertquery (ATL is a datatable in my database) function in my form (in view code) the row doesn't get added.
When i first used this function an exception occured was something like first system class exception data.dll something along that lines. . however , when i created a new oledb.oledbconnection and put its connection string as the one in windowsapplication1.my.settings.marketconnectionstring. and used the open comand to open a connection . the message stoppped appearing . however , the insertquery is not adding the row in my database still when i use it in the form.
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Nov 4, 2011
Use ExecuteSQLCommand and return my data in a datatable and access it? This is what I'm trying.[code]...
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Dec 27, 2011
I have a DataTable (comprising of three columns) created at runtime & populated by the users selections in other parts of the app. The DataTable is required as I need to manipulate the users data before graphing it, etc.I now need to save the DataTable (& associated data) to an Access DataBase so that I have a record of what the users data was.
Everything works fine apart from the saving of the DataTable bit........
I've managed to get the following working :-
For Each row As DataRow In ResponseTable.Rows
[code].....
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Dec 15, 2011
I have a table in Access with two key fields (let's call them Item and Cust). These key fields *combined* are the primary key. So each record must have a unique Item and User combination. It can have a duplicate Item with other records, and a duplicate Cust with other records, but not a duplicate of both. Because my "primary key" is a combination of two fields, I can't make a primary key on the table in Access (it only supports one field as a primary key).
I have another table in SQLServer which also has Item and Cust, but in addition, is has several descriptive fields that give more details about the Item and Cust. I'm trying to use ADO.NET to bring in that SQL Server table and UPDATE some matching fields in Access with the descriptive fields. [Code]
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May 22, 2009
Did anyone knows where can I upload a folder so my programe to be able to download an update from there???
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Apr 29, 2009
Source: DataTable
Destination: Access Database Table
I should mention that the DataTable contains data resulted by an SQL SELECT query and it's not related to the "targeted" Access Database Table.
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Mar 23, 2010
1. Can someone show me sample codes on how to do that ?
2. I encountered a problem with the INSERT sql statement. I keep receiving syntax error in insert statement exception. Is there anything wrong with the statement ?
[code]...
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Mar 14, 2011
I'm writing an asp.net page with a simple registration form that connects to my access database and inserts the values in the table. So I have my database, my registration page, everything looks fine in my code, but there's a syntax error I can't seem to figure out. When I go on my webpage and click submit, it says : Syntax error in INSERT INTO instruction.
Here's my code:
<%@Page language="vb" explicit="true" debug="true"%>
<%@Import Namespace="System.Data"%>
<%@Import Namespace="System.Data.OleDb"%>
[CODE]...
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Jun 9, 2009
I'm trying to insert data from an Access unbounds form to an Access Table using the follwoing code:
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Sep 22, 2011
I have a login form connected to a datatable containing 2 columns: username ans password. I want the user to be able to add new usernames and passwords from a button click after they enter a new username and password into textboxes on "create new user" form. I think I'm close but my table doesn't seem to be updating. Why is the table not updating? This is my code:
[Code]...
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Jul 2, 2010
I created a DetailView of a DataTable in a Form. This also created a BindingNavigator and all of this works fine.However, one TextBox in the Form shows the LangaugeCode and I'd like to use my refLanguage DataTable to show the LanguageName instead. How do I go about doing that?
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Jul 28, 2009
essentially what i'm trying to do here is Have the combobox in Form1 List the values in that column of Table1 (i can get it to do that), but when i click on one it adds it into the PRTNUM column in current row of datatable Table2.
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Jul 15, 2010
I have a base form and I am trying to get the DataSource of the ActiveControl if the control is a datagridview.What I have so far is:
Dim curControl As Control = Me.ActiveControl
Dim ControlType As String = curControl.GetType.ToString()
If ControlType = "System.Windows.Forms.DataGridView" Then
[code].....
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Feb 9, 2010
[code]
Imports System.Data.OleDb
Imports System.Data.SqlClient
Imports System.Configuration
[code]....
I don't know if these can connect with Access, anyway, I got ERROR on the com.Connection.Open()?
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Aug 18, 2011
I am trying to display value of the field ("UserID") for every row exists in datatable to checkboxlist(make the checkboxlist item selected).
I used for loop, but only the field value from last row of RoleUsers table is selected in the checkboxlist.
Here is my code
Private Sub DisplayRoleUser()
Dim conn As SqlConnection
Dim cmd As SqlCommand
[Code].....
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Mar 15, 2010
I have a datatable and I apply a filter to the defaultview.rowfilter property of that datatable. If I then loop through the rows collection of the datatable, will I only be able to see those rows that the filter applies to, or will it loop through all the rows?
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Apr 21, 2010
I am working on a project that takes an xml schema and xml data files and places them into a DataTable, the 2 files are generated from a working table that i have written to disk. I wish to load these 2 files into a DataTable. Here is What i have
vb.net
Friend Function CreateTable(ByVal tableName As String) As Boolean
Dim table As New DataTable(tableName)
table.ReadXmlSchema(tableName & ".xsd")
[code]....
this however produces the following error on line 3
Quote:
System.ArgumentException was unhandled Message=DataTable 'get_item_list' does not match to any DataTable in source.
get_item_list is the parameter passed into this function (tableName)
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