VS 2010 Add Column To Datatable And Save To Database
May 1, 2012
I have an application that users will save a list of clients to a database. The extension on the database is .sdk, and I think is some kind of sql database. The user can save rows and add rows to maintain a client list, but when I release an update, I have to install it without the database file. If I install with the database file, then their current client database is replaced with a new blank database.
my issue is that I need to add columns to tables in their existing database without overwriting their current rows. For example, i have columns for client name, address, and phone number currently. On my next update, I want the user to be able to save client birthdays. Here is what I have:
[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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Mar 15, 2009
I have a datatable which has 5 column. It is possible to copy only its 2 column in and save it into new datatable.I used this code but it copies all the 5 column
Code:
Dim qry As DataTable = (From obj In temptable Where obj.Item("Column1") = 0 _
Select obj).CopyToDataTable
i used this one but it is not supported
Code:
Dim qry As DataTable = (From obj In temptable Where obj.Item("Column1") = 0 _
Select obj.item("Column1"), obj.item("Column2")).CopyToDataTable
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Sep 27, 2010
how to update my database table by the data inside my datatable.this is my class
public class Sample
Private ds As New DataSet("myDs")
private dt as new Datatable("myDT")
Private data_adapter As SqlDataAdapter
[code]....
i had problem in sub deleterow AcceptChanges() method not seems to work.i cannot update my database if i put AcceptChanges() method after the delete row..if i delete 1 row then hit the updatedatabase sub the record in my database is the same..seems like there is no delete happened..my server is mssql2000
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Oct 15, 2009
Ive created one database Sql Server Compact Edition 2005, with one table ("Cliente") I know that I can created my database good, but i have a problem saving information since three textbox, in my table(With columns "Nombre" "Apellido" "Cliente". In my form there is a button save ("Guardar"). When I do click in my button appear the next message : "The column cannot contain null values. [ Column name = Nombre,Table name = Cliente ] " and happen the same with apellido and Id_Cliente. And this happen becouse my code cant save the information....
This is the code
Option Explicit On
Option Strict On
Imports System
Imports System.IO
Imports System.Data
[CODE]...
And the code for my button is:
Private Sub cmdguardar_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdguardar.Click
Dim myconnection As SqlCeConnection
Dim mycommand As SqlCeCommand
[CODE]...
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Mar 24, 2011
I have a database (access) and a listbox which is databound to it etc, and controls the currently selected row in the database.
And i want to check a columns value from the selected row via code, how can i do it? None of the examples on google are recent or for vb.
The column i want to get the value from is
Coulmn name = Related
Column number = 15
The value will be used in a filter so needs to be returned as a string
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Mar 15, 2012
I'm creating an small application where I search from the databse table tems and add the result line to a datarow of my datatable "dt", I the set the datagridviewe datatsource to this same dt.How can I save this dt content into another table of the same database.I'm not ussing stored procedures and dont understand much of parameters.
CODE
Dim cs As New SqlConnection("Data Source=myserver;Initial Catalog=mydatabase;Integrated Security=True")
Dim da As New SqlDataAdapter
Dim ds As New DataSet("Chosed")
[code]....
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Mar 23, 2012
I'm trying to load a datable into a datagridview, but column1 ("date") should be converted to a datetime, so I can sort it when I click on the datagridview header. I tried this, but it gives me that there is no column 0 or one. I have 2 columns: "ID" and "DateStart"
[code]...................
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Mar 10, 2010
How to Save DataTable Structure And Data Into A Datatbase Table..
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May 11, 2012
I have picturebox that the user can import an image, and then save it to the datatable. I can save it with no problem, and the image, which is a logo, will populate onto my crystal reports pages.My issue, is that I want the logo to automatically load into the picturebox when the user opens my settings form. How can I do the opposite of the following:
'set the company datatable for sub
Dim borrowersrow As PlannerFilesDataSet.CompanytableRow
'use only the first row
[code]....
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Jul 3, 2010
I want to save a datatable to the app.config file (My.Settings) and what i have understand is that you can use the Datatable.WriteXML to convert it to XML and then save that string to the settings.
But how do i rebuild it from the xml? Do i have to create my own code to do that or is there a method?
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Jun 3, 2012
I need to write a method in C# to save all rows in a given datatable back to the database, but I cannot depend on the rowstate of each row. I can't think of how best to do this without extensive looping through the database table data or constant database querying.
I want to essentially perform the following insert / update for each row in the datatable, but more efficiently:
[Code]...
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May 3, 2012
I have a Datatable with one column of the table being 'PartNum(product part number)'. I used EntriesTable.DefaultView.Sort = "PartNum ASC" to sort the whole Table, with respect to the information in this column. Now I'm just trying to further sort the table by grouping rows that have same info under that column together and do something to each of such groups. but I'm kinda stuck here.
I'm thinking of creating some sub-DataTables out of the original one and have these sub-tables to hold those rows with same info under "PartNum". Does anyone have ideas how to do that? maybe with DataReader or DataView ,
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Apr 30, 2010
I would like to save Gridview with all of the columns value and reload the same grid without using database?
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Nov 1, 2011
in row or column..particular(one cell) should edit and change the information...and save to database...
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Feb 3, 2011
I am using Regex operation by retriving column into Richtextbox and run sevral time of all regex operation ( which is quite good and faster on that) then updating that inti database (Sqlite).
1. Retriving 1 million of record column into richtextbox from database.
2. updating database with that.(using richtextbox).these things killing time.
what to use in place of that.(means what to use for fast preview-run regex - update that edited column into database)
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May 8, 2012
I have three sub tables that I want to process. For each I want to combine the rows, as they are only different by contents in the second column(I want to do the same to the fourth column, later):
'Sub table 1
xx|C201 |02300877 |Samsung |....
xx|C201 |02300877 |Toshiba |....
xx|C213 |02300877 |Samsung
[code]....
p.s. For the fourth column, Manufacturer information , I want to do the same and I'd probably get something like this for the final table:
xx| C201,C213,C606,C619 |02300877 | Samsung
xx| C201,C213,C606,C619 |02300877 | Toshiba
xx| C303, C305,C712 |02301163
xx| C207, C209, C708 |02301165
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Apr 1, 2011
i have problem when save boolean value to database. this my code vb.net
if bAdd then scmd.CommandText = "insert into products(prod_id,status) values(@prod_id,@status)"else scmd.CommandText = "update products set status=@status where prod_id=@prod_id"end if scmd.Parameters.Add(New OleDbParameter("@status", CBool(chkStatus.Checked))) scmd.Connection = dbConnDim iResult As Integer = scmd.ExecuteNonQuery
i get problem when execute query at line
scmd.ExecuteNonQuery
Data type mismatch in criteria expression
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Apr 10, 2012
I am having a record of a specific company, I have saved all the details however, now for each company, there are like 3 + (Can get up to 6 or 7) business cards which I want to save.I want it something like, when I press Add button, a forms pops up and there is a picturebox, textbox and browse button. (And "+" button which will create these controls for next card in second line.)
When I press browse, and locate my image. It should show the image in picture box and save it in database or my app or excel file etc.So When i go to viewing section, I can see all the business cards which I have saved for that specific company.
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Feb 5, 2012
I have a data table, i want to add a new column on that table, the data in that new column will depend in the data from another column. Now i can think of two ways to accomplish this, first is loop through the whole table and do the statements to get my new columns appropriate data. the second approach would be to give the new column an expression, then convert the table to xml (to remove the expression) then convert the xml string back to datatable.
Now, is there any other way around this? what could be the most optimized way in solving this task?
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Oct 27, 2011
After Filling a DataTable in GridView's DataSource . A column with check box Type appears but it created as read only column and I can't enable it or make it editable... even i tried .readonly = false and still can't be edited
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Mar 21, 2011
I have a VB 2010 program with a single-table Access Database.I have selected the option to copy the Access Database to the output directory.When doing so, the program copies the original database to the inDebug folder.I want the original (NOT the copy) to be modified when the program is being tested.Also, when I attempted to publish the program and run it to test, I got an error which was sourced to be a temporary file (which was the database) that was missing.I think this is a reaction from the "Copy Always" option.
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Jan 31, 2011
I have a program for collecting data of people. Now i also have a picture of these people... what is the best thing to do? what is the fastest? the safest?
1. Converting a picture to a bytearray an then insert it into a sql -table (with al ready 5 columns).
2. making an new table on the sql database with just two columns (id-ref, picture-column)
3. or saving a file on to the hard drive? (if nescessary saving the url into the database?)
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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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Jun 5, 2012
I have a datatable that has a resource in one field and hours used in another, it looks like this -
Resource Hours Used
Manager 1
Accountant 1
Field Staff 2
Accountant 3
Manager 4
Manager 1
Administrator 6
Field Staff 4
Manager 0.5
Administrator 1
What I want to do is be able to create a summary of the data table above that groups multiple occurrences of a resource and adds up the hours used for that resource, creating a summary that looks like this -
Resource Hours Used
Manager 6.5
Accountant 4
Field Staff 6
Administrator 7
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Feb 26, 2012
Can someone help me i am trying to add and save customers to my database and it doesnt seem to be letting me unless i directly go into the grid and add them there. You can see that the addnew button adds them but it wont save them. when i go back and preiview the data on the table its not there. I am just tring to develope a regular simple customers database
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Dec 30, 2010
I have a string say, str = "system.Int16" I want to add a column in DataTable say, dt = new DataTable()I want DataType for that column as per 'str', i.e. System.Int16 Then How to? dt.Columns.Add("MyColumn", ...)
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Dec 15, 2011
im currently doing my special project in software development
[Code]...
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Nov 6, 2010
Can't add a new column for DataTable
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Mar 26, 2010
I have a dataset with just 1 datatable and 1 row but with 2 columns.I want to get the value of the 1st column.How can I get it in vb.net
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