Update Values In A DataTable?
Aug 17, 2011
I have two data tables. dtAllResults is the master data table which contains ResultIDs and everything related to each ResultID. dtNoCV is the other data table which only contains ResultIDs. If the ResultID from dtNoCV is located in dtAllResults I want to update some checkbox cells in dtAllResults (as seen below).
I'm looking for better performance, because dtNoCV may contain a few hundred ResultIDs and I'm afraid this loop will slow things down.
Private Function prvfnc_UpdateDGVSource(ByRef dtAllResults As DataTable, ByVal dtNoCV As DataTable, ByVal intEnumValue As Integer) As String
Try
[Code]....
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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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Aug 10, 2011
I am updating a data table (dt_report_crypt) from an encrypted csv file in the code below:I decrypt the colums and update the same dreport_crypt, such that it will contain de-crypted data.This part is working wellI however need to use this de-crypted datatable as a data source to update a second table(dt_report), using the sql SELECT command to filter relevant data,
Dim dt_report As DataTable
Dim dt_report_crypt As DataTable
Using cn As
[code].....
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Dec 28, 2011
I've got two data tables with store numbers. I need to find out what store numbers are in one data table that arent in another.say one table A might look like:
34, 35, 39
the other table B may be
34, 35, 39, 45
I need to find the 45 If I use nested For Next I can get matches but anything not a match would show up not just the 45 value as the next progresses.
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Apr 15, 2012
I am using vb.net with access database. I am using sql. How can i update database with the value 40'6"(Feet and inches values)
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May 25, 2009
I want to update a record in my database but without using "update mytblname" query.I am using following code ,
sql = "select * from customer where id = " & Val(Me.id.Text)
Dim adapter As New SqlDataAdapter(sql, conn)
Dim builder As SqlCommandBuilder = New SqlCommandBuilder(adapter)
[code]....
Its giving me error.
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Mar 5, 2009
I have the following code:
Dim i As Integer = dtResult.Rows.Count
For i = 0 To dtResult.Rows.Count Step 1
strVerse = blHelper.Highlight(dtResult.Rows(i).ToString, s)
[code]....
I want to add a strVerse to the current row.
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Nov 22, 2010
When i trying to update the datatable i have this error: Syntax error INSERT INTO
The code
Imports System.Data
Imports System.Data.OleDb
[code]....
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Sep 21, 2010
discovered the compact mode of this instructions vs usual code. I found sample code for selecting, etc. from a datatable, transforming a column in a list or array - all operations are "Select"s - readonly.I need to make an simple update on a certain rows (using LINQ) from a DISCONNECTED datatable for which now I'm using this
for each dr as datarow in dtable.Rows
dr("MyField") = 77
next
[code].....
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Apr 5, 2011
I need to make a small application in which I use a datagridview that is populated with data from a table from an SQL Server.In this datagridview I marked the checkbox for adding new rows, also for modifying values, etc So the user should be able to change values inside the datagridview and when the job is finished I have 'Save' button which should Updateall changes in database.For retreving data from the SQL server I use method
Me.Bedarf_tableTableAdapter.Fill(Me.ISB_CLDataSet.bedarf_table)
and for update I use:
Me.Bedarf_tableTableAdapter.Update(ISB_CLDataSet)
I have only one problem - When I clcik on the Save button I receive a message like this:Update requires a valid UpdateCommand when passed DataRow collection with modified rows.but only if I change values from existing rows. I am adding new rows the update method is working perfectly.
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May 13, 2012
i create a Class to update data from remote sql server to local compact sql server data. I write two method one method check if any update date in remote server method like..[code]Last i Call SaveLocalDatabase method. But When i check table in my local compact sql server database there has no data update.is any think missing to write. i Think i found a problem. i use LocalTable.Merge(dTable, True). When Merge Call then rowstate remain unchange.
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May 15, 2012
I m' trying to select a row and then edit, and no error on debuggiing but the changes are not saved on the database
[Code]....
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Jan 9, 2011
- i have a DataGridView (DGV) whose datasource is a DataTable (not BindingSource).
the DGV is used to sort the datatable before splitting the fields into different textboxes.
i can add/delete record from the DGV and the Database is modified accordingly. but it seems that i can append an existing record in the DGV thru the textboxes but the changes are not made to the database.
here is my codes for the form and buttons:
'*****This One Works Fines but it is used to add new records****
Private Sub CmdCommit_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles CmdCommit.Click
If Index <> -1 Then
[Code]....
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Aug 12, 2010
I get a syntax error while trying to update a datatable using this syntax string:"SELECT * FROM ClientContacts WHERE MembershipID = '" & stringVariable & "' "
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Feb 9, 2011
I used the DataSet Designer to create FTWDataSet which holds the AlarmText table from a SQLExpress database.This far my form contains ONLY Datagridview1.The code below successfully shows the contents of the AlarmText table plus the one added checkbox column (which I will populate with display-only data, and is not an issue here).
Dim ta As New FTWDataSetTableAdapters.AlarmTextTableAdapter
Dim dt As New FTWDataSet.AlarmTextDataTable
ta.Fill(dt)[code]....
What else do I need to do to use the DataGridView to edit and save values in the AlarmText table?
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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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Mar 21, 2012
I have a DataGridView bound to a DataTable. Although all rows are displayed in the grid, the table represented by the Grid's DataSource does not get updated after changing values in one or more DataGridView columns. Both grid and table contain a Primary Key. What am I missing here? Do I need to do something in the RowValidated event?
dgvCriticalContacts.AutoGenerateColumns = False
Dim ccRs As DataTable = Common.OpenRecordset("SELECT * FROM PhoneList")
dgvCriticalContacts.DataSource = ccRs
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Oct 19, 2011
I have a form with a DataGridView (dgvResults) control on it that displays data from a DataTable (dt). On this same form I have a button that the user will click to update a column (intCommentCode) on dgvResults with a numeric code they have entered in a text box. When the form is first displayed all 100 rows of dt are displayed. The user may filter dt to only show 10 rows. When the user clicks the button, I only want to update those ten rows. The code below updates dgvResults just fine, but dt is not updated, why? I thought that if dgvResults was updated dt would automatically be updated also. How do I update dt to match what dgvResults shows?
[Code]...
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Mar 11, 2010
I have followin codes
Dim dt As DataTable
Dim str As New SqlClient.SqlCommand("select code,name from employees", con)
da = New SqlClient.SqlDataAdapter(str)
[Code].....
How to update datatable with master table?
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Mar 23, 2011
If the application is used with multiple users/instances adding records to the same database, whats the best practice for doing this and not incurring any conflicts with primary keys. Right now my partial solution is to do a tableadapter.fill before adding a new row to retrieve any new records. But this obviously isnt the best practical solution as the likleyhood of a conflict still exists when letting the apllication increment the key.
Whats a "correct" way to do this, any reading or examples would be great for me to learn.
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Apr 20, 2011
I am trying to update mysql table from a txt file using vb.net. 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"
[code]....
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Nov 14, 2011
I have a table that has 9 columns, this table has about 5000 rows, but sometimes the user need to update the data in the table. The new data is in another table, with different columns names and only with 8 columns, the ninth column it's the date of the update (i know that this columns shouldn't be here...).
So for now i'm filing one datatable (the data come form a webservice that returns a dataset with this table), and after that i clean the original table and then for each row in the new datatable i call the insert command.Is there other way, better way, to do this?
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Mar 17, 2011
How to make the data in the DataTable automatically change when there is the Insert, Update or Delete.my code like this:
VB.NET
Imports System.Data
Imports System.Data.OleDb
[code].....
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May 22, 2012
I have the String and integers to which some values are assigned. now i need to read the string and integer values and assigned them to the datatable which i have created using VB.Net.
[Code]...
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Dec 1, 2010
I have an application in which I have two text boxes in which I enter name and age, after I enter the name and age then I click the Add button when I click the add button then the Name and the age should be displayed on the Datagrid contol in the same application. But the data should not get saved in the Database, it should just show the data on the Datagrid contol. And they have told me that its mandatory that I have to use the DataTable object.
And when i click the Commit Changes then only the data should get saved to the Data base...This i can do .
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Jan 10, 2012
Here is my code
Dim dt As DataTable = New DataTable("Intervenant")
For Each column As DataControlField In grdvIntervenants.Columns
dt.Columns.Add(New DataColumn(column.HeaderText))
Next
[code]....
I am developing in ASP.NET using VB.NET as background code. I am on vs2008 with windows 7 enterprise edition.I have just restarted doing VB.Net and my first time using a gridview without a DataBase, so maybe I am missing something. Basically, I am trying to add a DataRow (dr) to a DataTable (dt) and then put said DataTable into a Gridview (grdvIntervenants).My first step is to take the gridview and put all its data into a DataTable. Then i create a DataRow(dr) that I populate with variables and I add said DataRow to the DataTable. After that, I put the DataTable as the DataSource and bind the GridView.
The problem is that my GridView shows the rows but they are empty.While debugging, I found out that this error was beside all the DataRow.Item:"In order to evaluate an indexed property, the property must be qualified and the arguments must be explicitly supplied by the user" Seraching for it on the net.I did not totally understand the error, so i tried many different ways of adding the data into the DataRow but to no avail. I also tried different way of adding the column thinking the index problem might be coming from there, but again, the problem persisted. Now, something I found weird was that the Item property of my DataRow gives the quoted error, but I see the values into the ItemArray of the DataRow.I also found out that the same error appears beside the columns property into the dataTable.When I try to access the data from the DataSource in my rowDatabound method using the DataBinder, it gives me null results...
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Oct 6, 2011
Im working on an Asp.net / VB.net website and coming from a C# / WPF background things are still a little new to me. I have declared a DataTable like so: Public notificationList As DataTable And I have then used the Page_Load event handler to populate it and bind it to a control on my page, which all works fine
[Code]....
However in another method i need to be able to access this DataTable, yet whenever I do it always appears as nothing. Do I need to be storing this value elsewhere like in the session etc?
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Feb 18, 2009
I have two datatables in which I query out the required data.Both has one comman column LOTNUM.
1st table LOTNUM and EXPECTEDRETURNDATE, FLAG(default="open")
2nd table LOTNUM and ACTUALRETURNDATE
I want to compare
if ACTUALRETURNDATE<EXPECTEDRETURNDATE
then
Change the value of
table1.FLAG= "CLosed"
else nothing
I want to do that for all the values that are there in table 1.So table 2 is just like a reference table to compare its date with.
Dim cmd2 As New SqlCommand
cmd2.Connection = con
cmd2.CommandType = CommandType.Text
[code]....
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Aug 25, 2011
Here is what i am doing as of now...
For i As Integer = 0 To Dt1.Rows.Count - 1
Cmd.CommandText = "UPDATE Spares SET Pur_Price=" &
Dt1.Rows(i)("Cost_Price") & ",Sell_Price=" &
[Code].....
However this procedure is very time consuming, i need to optimize it. I need to update 20000 rows ...
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Mar 27, 2012
I need to force a DataGridView cell to update the underlying DataTable.I fill a DataTable using my adapters Fill method, then set that DataTable as my DataGridView's datasource. Lets say one of my DataGridView columns is a CheckBox column.If I left-click a checkbox in the first row and then left click a different row in the DataGridView the underlying DataTable_RowChanged event fires, which tells me the first edit I did has gone to the underlying DataTable.If I left-click the checkbox in a row and then right-click the column header to display my context menu the DataTable_ RowChanged event doesn't fire because the DataGridView row is still in edit mode.I've tried Me.DataGridView.EndEdit(),but that doesn't cause my RowChanged event to fire,I need to ensure my underlying DataTable matches the data in the DataGridView, because I am getting a subset of my original table.[code]
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