Cannot Get The DataBase To Switch From Field1 In A Datatable To Field2
Mar 13, 2010
I want to search an MS Access DataBase using a Dim string Array to match the DataBase Field1 and insert a Bitmap image...
I have a MS Access database with 2 fields
1) a text
2) a bitmap
I want to search the text field1 using a strArray[intcount] to match the text inside the database then using the same row of the database to insert an image of field2...
I cannot get the DataBase to switch from field1 Text in a dataSet to field2 Bitmap same row...
the string array has only 7 arrays, they are to match the databases Field1 then using an PictureBox.Image = Field2.Bitmap
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Oct 2, 2009
I'm very new to asp.net and I have a general question about datalists. I was able to get this to work, but I don't understand how really. I think I need someone to give me the "theory" on this. So first I connect to the database:
[Code]....
Here are my questions:
- Why is the datalist pulling field2 successfully?
- Are the MyCommand.Fill(DS, "field1") and DS.Tables("field1").DefaultView meaningless?
- I guess my bottom-line question is, why do I have to specify fields in the vb if I can output any field?
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Jan 24, 2012
I have an application written in ASP.NET and using EF. I want to make a copy of the live database, have my application point to the copy, and be able to run the application against it as if it is live...but making updates to the copy.
I know I can manually copy the database and manually update the web.config files...but I'm wondering if there is a better, more automated method for achieving this with VS 2010?
Also, if there is anything I need to know about setting up a live/dev version of a database while using EF4.
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Nov 2, 2011
I have developed a VB.NET program using a strongly typed dataset. This dataset has its connection to a SQL Server 2008 R2. The software should now be additionally used offline. The database should be exported to a *.sdf database. If no connection to the SQL server is produced, the software have to try to connect to the *.sdf database.I would like to achieve:
1. Export the data in the SQL Server 2008 R2 database to a local *.sdf file.
2. This *.sdf file has to work as an alternate connection string in the strongly typed dataset.
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Mar 18, 2010
I am currently working on a project for school. I have the project all laid out in my mind and everything but there is one thing that stops me. I can not access the data from the database itself ...
(detailed info)
I am using an AMD Athlon x64 bit processor with a windows vista 64 bit operating system. I am writing the program on visual basic 2008 express edition. When I open up the visual basic 2008 express edition and create a new project the first thing I do is go to the view menu and activate my database explorer. I connect to the database in question through the database explorer. The database I am connecting to is an access 2007 database (ive opened up the access 2007 files and they do open and display information properly, in otherwords, they do work) I then put in a listbox and use the following lines of code in a form load event to both A) create the datatable and B) automatically fill the listbox with the database info.
Dim dt As New DataTable()
Dim connStr As String = "Provider=Microsoft.Jet.OLEDB.4.0;" & _
"Data Source=MEGACITIES.MDB"
[Code]....
When I test the program the listbox does not fill up with any information from the MEGACITIES access 2007 database. Ive tried connecting to the database by establishing a connection through the datasources window. Ive tried establishing a connection to the database through both the database explorer and data sources window. No matter what I try I can not get that information accessed.
Im almost confident that this has to do with my processor being 64 bit.
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Dec 3, 2011
I populate a datatable from a database. The table is sorted by the first column.
Then I add some new rows to the table. After that I sort the table with pgds.Tables(0).DefaultView.Sort = "firstcolumnname"
The new added rows are listed after the originally ordered rows and not in the right order.
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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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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 31, 2010
I am trying to add a datatable to a database. Here's what I've been trying:
Dim newDataTable As DataTable = New DataTable("Example")
VocabularyDataSet.Tables.Add(newDataTable)
SqlDataAdapter1.Fill(VocabularyDataSet.Tables("Example"))
I've tried various incarnations of Fill and Update. But the tables will not save on the database!
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Oct 8, 2010
This is my GET Method to get my data from my DataTable
Private Function GetData() As PagedDataSource
' Declarations
Dim dt As New DataTable
[code].....
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Apr 15, 2008
I have one specific problem, that is relative to DataTable Updates to Database.
Code:
auxDatatable = Mydataset.MyDatatable.GetChanges
Now i'm going to Accept or Reject Changes based on some Criteria. The problem is that I wish to Update Only the Records that in Fact exist on the Database, as you can imagine I was forced to create some Dummy Records in Datatable, to a specific job.
My approach to this issue was to do something like this :
Code:
Private Sub MySub (ByVal auxDatatable As DataTable)
Dim drView As Mydataset.Mydatatable
For i As Integer = 0 To auxDatatable.Rows.Count - 1
[CODE]...
As you can see I tried to Delete the rows that are Dummys, but the rows in fact are not being deleted. As consequence I get an error after that Sub, when i try to make :
Code:
MyTableAdapter.Update(auxDatatable)
This is naturaly caused by the dummy Records.
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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 23, 2010
I have created a gridview to allow users to type two fields in each row after that I added the user data into a DataTable now I want to insert this DataTable content into the database where each row will have 1 uniqe Id in the database without using loop.If it is not possible without a loop please show me how to do this with the loop Again I already have the DataTable filled up and it is ready to be inserted into the database?
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Aug 9, 2010
[code].....
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Dec 30, 2009
I am using Dynamic Textboxes. I am Loading table in Datatable from Database. From that Datatable i am naming the textboxes. After entering some values in the textboxes during runtime, i want that values to be added to the database. So i Coded as below. But i am getting errors as value of type '1-dimensional array of System.Windows.Forms.Control' cannot be converted to 'System.Windows.Forms.TextBox'.Here's my coding
Private Sub btn_click(ByVal sender As Object, ByVal e As System.EventArgs)
[Code]...
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Jun 1, 2012
I'm getting a set of data by a datareader and assigning to a string. Now I need to fill the datatable columns with the Query fields. The datatable is connected to a grid to display the filled data.
query is : strSQL = "SELECT EmpCode,EmpID,EmpName FROM dbo.Employee"
Datatable columns are EmpCode,EmpID,EmpName.
I need to read the query and assigned to the columns of datatable and fill the table.
Me.DtShifts.Tables("NonAllocated").Clear()
Me.DtShifts.Tables("NonAllocated").Load(dr)
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Apr 12, 2011
I have a form in my application that presents users with a datagridview which pulls data from database-a. I then offer the users the ability to edit that data but what I'd like to do is when they click the save event, that it saves their changes to database-b.
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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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Nov 11, 2011
with vb.net2008 + MS access i am having a datatable with considerably more number of rows i need to update it to database with best possible way i mean eigther through LINQ or any other method except looping through each row excecuting the insert operation through command object?
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Jun 1, 2011
I am trying to convert some old VB6 code into VB.NET. The old code used DAO and now I am trying to replicate it in ADO.NET/OleDB. I have made some advances (I think...) but now I can't figure out how to add the DataTable object into the database.[code]So instead of the TableDef, I am taking the data from the same sheet and putting it in a DataTable object (dt). I hope this is correct so far. Now my question is how to replicate the m_db.TableDefs.Append td line from above.
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Nov 5, 2010
In a web applicaion using vb.net as the code behind. I have created a DataSet (hdar) in the designer with a data table and table adapter (AccessRequests). I am trying to add a row to the database table using datatable.add row
[Code]...
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Dec 28, 2010
I am new to ADO.Net and I mistakenly using the dataset as how we use recordsets in ADO., I know that it is possible to create a Datatable which will only reside in the memory and hold data. What I need to create is like this.
1. Create Datatable.
2. Fill it with sample data at least 3 lines.
3. Transfer the data from datatable to database (access,sqlsrvr etc).
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Dec 28, 2011
im using vb.net winform.i want to update a datatable to sqlserver. but before that. i need to check by comparing it to another datatable(same structure but contain new data). i need to insert new data only.
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Apr 8, 2010
Imports System.Data.SqlClient
Imports System.Data
Imports System
Imports MySql.Data.MySqlClient
Public Class Form1
[Code] .....
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Dec 19, 2009
How do I perform an sql query onto a DataTable not a Database table?
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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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Jan 31, 2011
I've been looking at this problem for a while and can't see what I'm doing wrong. I need an extra set of eyes. The business problem that I am trying to solve is the following:I have a table that contains a list of auction items that are displayed in a datagridview. I have another table that has a list of bidders. At the end of the auction I need to update the Winners table with the bidder number and item number of the auction item. To do this, I display all of the auction items and then let the user enter the bidder number and winning bid amount in the datagridview. When finished, the user clicks on Save and the information is pulled from the datagridview and saved in the Winners table.
I have a datagridview (AuctionItemsDataGridView) that uses the auctionitems table from my database as its source. I add the BidderNo, WinningBid and BidderName columns to the datagridview when the form is loaded. There are 3 types of auction items so I prompt the user for the type of auction items to display using a combotextbox (CategoryComboBox). When an auction category is chosen, I load the auction items for that code into the datagridview. I then load the winners from the winners table into a WinnersDataTable (WinnersDT). For each item in the datagridview, I check if there is a corresponding item in the Winners Table. If there is then I populate the BidderNo and WinningBid columns of the datagridview (I also populate the BidderName). So far all of this works. The problem is when I make a change to the datagridview.If I enter a bidder number and winnng bid amount the data is not being saved to the physical database table. To save the data I perform the following:
For each item in the datagridview, check if a Bidder Number is entered. If a bidder has been entered, I check to see if there is a corresponding winners record in the WinnersDataTable for the current item. If yes, I enter the bidder number and winnng bid amount in the table. If there isn't a record, I add a new one. After looking at each item I call the Update method on the WinnersDataTable.
Public Class Winners
Dim BidderDT As DataTable
Dim WinnersDT As DataTable
Dim pageLoading As Boolean
[code]....
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Sep 4, 2009
insert a datatable into a mysql database? The way I'm doing it now is that I'm doing a for each-loop and inserting one and one row. Is there a better way to do this? I have like 500+ rows, so it takes a while to execute the loop.
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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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