VS 2008 Edit/update Records From The Database Using Textboxes By Linq To Sql?
Sep 26, 2009
This is the hardest part of LinqtoSql database handling operations in visual basic 2008 I ever encountered,w/c is the update operation cause Ive been posting this thread several times from the other forum site but noone yet was able to answer my question,examples were given but its not efficient cause it won't specify based on the codes i gave and i know its not easy but im still hoping that one of the answerers of this forum will be able to resolve this particular linqtosql operation codes. I used textboxes in manipulating all data into the database such as displaying records, adding records, & updating records, basically I used with textboxes in doing those database operations. I will give you 3 block of codes w/c corresponds those database operations I used and differentiate from each other inorder for us to determine why one of them has no progress or won't do its operation w/c is the update operation...
*************Block of Codes#1(Adding Records)*************
Private Sub Button1_Click(------------------) Handles Button1.Click
Dim db As New memrecDataContext()
[code]....
I would like you to identify,differentiate, or troubleshoot the block of codes#3, or anyhow, why it has no progress at all or it won't edit and change the records but it runs and no error in regards with its code, and the other 2 blocks of codes were able to successfully do its operations.I was just wandering why only the block of codes#3 is not doing its operation successfully when you change the record being displayed in the textbox.Is there a possible way to edit records in the textboxes?If there is.... Is it possible to debug the block of codes#3 to successsfully do its operation? If you could possibly give an example,can you based it on the block of codes#3?
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Oct 14, 2009
I'm using visual basic 2008 express edition by linq to sql for my database operation such as edit records. I did not use any sql server but I'm just using the built-in sql server within the visual basic 2008 express. I tried to revised the codes, no error in syntax but there's an error at runtime and it pops-up a window message saying its error message. What I want is to edit the records which were retrieved from the database into the text-boxes and when you click the button5 whatever the new value on the text-boxes should replace the previous one.The Account field is the field in my Table1 in memrec.dbml which I set up for primary key is true and the rest of the fields are false in its primary key.[code]...
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Oct 14, 2009
I'm using visual basic 2008 express edition by linq to sql for my database operation such as edit records. I did not use any sql server but I'm just using the built-in sql server within the visual basic 2008 express. I tried to revised the codes, no error in syntax but there's an error at runtime and it pops-up a window message saying its error message. What I want is to edit the records which were retrieved from the database into the text-boxes and when you click the button5 whatever the new value on the text-boxes should replace the previous one.The Account field is the field in my Table1 in memrec.dbml which I set up for primary key is true and the rest of the fields are false in its primary key.The code below still found an error when you run the program and it pops-up a window which says:
NotSupportedException was unhandled - Sql server does not handle comparison of NText, Text, Xml, or Image data types.It highlights a yellow background on the line:
db.SubmitChanges()
These are what I see on each field's property on Table1 in memrec.dbml property window:
Access - Public
Type - String(System.String)
Server Data Type - Text[code]........
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Oct 26, 2009
When i tried with the code discussed in this forum i am able to add records but not modify any particular existing record.
[Code].....
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Oct 19, 2009
Is it possible to do a multiple records editing by linqtosql method in one click event? What I've been trying to do is to edit all the names in the table which are having the same account number. I was able to edit but only one name has been edited and the rest are not.
The codes I used.
Private Sub Button2_Click(------------) Handles Button2.Click
Dim accnt As String
accnt = Textbox1.Text
Dim db As New memrecDataContext()
Dim editrecord = From mem In db.Table1s
[Code] ......
Why is it these codes could only edit records in one datarow?
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Aug 17, 2009
I have a DataGridView bound to a non-SQL Server database. I need to allow users to edit existing records but under certain circumstances I need to intercept the edit and instead of committing and updating the dataset I need to delete the edited record and re-add it as a new record. I have tried using every event I can think of to do this but haven't managed to get it right.
The closest I have got is with this:
Dim theRow As DataGridViewRow
Private loading As Boolean = True
Private rowLeft As Boolean = False
Private WithEvents cm As CurrencyManager
Dim copiedRow0 As String
[Code] .....
This almost works but sometimes completely messes up and re-adds rows twice and all kinds of other bad side effects. It seems a really simple thing to want to do but I just can't get it working.
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Mar 21, 2010
How to perform add, edit, delete in a dataset that will update the database as well?
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Oct 27, 2009
how to get records into oracle database delete from db & update the records i have successfully connected my vb 2008 win form with oracle 10g.
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Jun 6, 2011
how to use datagridview and why and when we use adaptor and data reader
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Jun 21, 2010
Dear Friends I have Developed a Successful Database Software, it include Datagrid, First, Last, Next, Previous, Add, Delete, Edit, Update, Search just Every Thing is Working Nice, But I need help from one of expert from you. my problem is that every time when i Start program its all functions are workin including edit and delete. (mean data (rows) Added at previous run is able to be Delted at current time) but when i add new record at current run time it adds succesfully, but while at same run time session (current) i tries to Delete or edit new added roecord it is not working, in simple words new added records are not able to delete and edit at same run session. i m including project's zip file and plz try to run it and add new record, after adding record at same time try to edit or Delete new added record.
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May 12, 2010
how can i access the sql server express database table in vb.net on forms to insert records,delete records,search records,edit records.I have made table by using visual studio.
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Mar 13, 2011
I need to be able to save, edit, and delete records in an access database through vb2008. Editing and deleting records works perfect, but I cannot save new records. Can anyone assist?
Here is my code
Imports System.Data.OleDb
Public Class Main_Form
Dim con As OleDbConnection
Dim cmd As OleDbCommand
[code].....
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Jan 5, 2010
I'm trying to use a DataGridView Control to Add/Edit/Delete records in a simple database
table.I used the wizard to create the datagridview and it created a dataset a bindingsource
and a tableadaptor.When i run my project, data that is in the database table is displayed
correctly, but I can't add/edit/delete. What events/actions do I need to perform to add
these capabilities?
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Jun 21, 2010
Add, Delete, Edit and Update from the database using .NET?
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Jul 18, 2011
with vb.net + access 2007 i am having a database with 2 tables & 4.85 lak records
the task:i want to Loop through all the records & compare the Current record with the previous record & edit the database with some changes as per logic i have written a procedure but the process is very slow approximately it is taking 1 to 1.5 second to check & edit a record
here is my code
vb.net
Private Function ISCasuaLty(ByVal CAStype As String) As Boolean 'this procedure checks whether the duty type is of Casualty'& returns true if the casualty is "Y" else "N" FALSE If CAStype = "" OrElse CAStype Is Nothing OrElse CAStype = " " Then Return True ' there
[code].....
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May 18, 2010
I am trying to update my database from an Edit Contact form and I keep getting a syntax error on my update statement.
Dim sql2 As String = "UPDATE Contacts SET Company = '" & txtcompadd.Text & "'," & _
"Address = '" & txtaddressadd.Text & "'," & _
"City = '" & txtCityAdd.Text & "'," & _
[code]....
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Jan 25, 2012
i just want to just make the right codes in my program.. the problem is when i search using may txtbox and using the wildcard sql command. everytime i type letters it search the database.. but the other textbox is not changing on the selected one in database. heres the code :
[Code]...
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Jun 9, 2012
I have a small application that (Adds, retrieves and deletes) info from/into access 2007 database file.I'm using Oledb (Online Mode) .I use this code to save new record to the database file[code]...
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Nov 19, 2009
Ive created a form to add/delete/update records in a database ,but when i try and open the frm i get a NullReferenceExceptionUnhandled error, below is my code, i cannot for the life of me see where i've gone wrong, but maybe someone else can spot it?[code]
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Feb 6, 2012
How can I update multiple records in a database using one Update statement where the cases are different.
refundNumber = CASE _
WHEN salesRecords.invNo='1' AND itemNo='250' AND length(refundNumber) > 1 THEN _
concat(refundNumber, ', 88' ) Else '88' _
[Code].....
How could I translate this to an SQL CASE string?
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Sep 28, 2010
I am using Visual Studio 2008 for creating a Winforms app. I have connected a database to it called XStats. There is one table in it called XGames and in that table 2 fields, XIndex (the primary key field) and GameNumber. Using the following code I can add records to the database, the data is taken from a text box, but once added I cannot view them unless I shut down the app and restart it.
con.ConnectionString = connectionString
con.Open()
Dim cmd As New SqlCommand
[Code]....
The existing records in the database are displayed on the form in detailed view via a binding navigator. How can I make it so that I can view all the records in the database, even those that are added during the current session. As will be obvious, this is my first attempt at creating and using a database with a win forms app,
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Dec 14, 2010
1- How to delete & update any record in the DataBase in vb.net?
2- How to make search & advance search about any record in the DataBase in vb.net by date,ID ........etc?
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Sep 28, 2009
how to update records on an existing access database using vb.net with just a textbox and a command button and how a specific record of a field can show up in a label or a textbox
i connected vb.net to my access database by just clicking on "add new data source">>"new connection">>"microsoft access database file" and just continue..tested connection and done.
you can see in the screenshot of my form, by default the left side textboxes are disabled but they're enabled if the user checks the checkboxes and disabled again if unchecked.
assuming that the textbox is already enabled and i want to enter a value in the Brewed Coffee area of the form...for example 5. when i click on my Submit button the value of that particular record in the database will be updated, so in my table the value of the quantity field in Brewed Coffee will be 5.
another thing is that how can i see a particular value on a label or textbox from my database like on the Prices area. in my database if a product's price is 80 then it should show a 80 in the label. the values of the prices from the screesnshot of the form are not the ones on the database xD i just typed them in.
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Feb 2, 2012
private
void bindingNavigatorDeleteItem_Click(object
sender, EventArgs e)
{
[Code]....
code does not make chages to database when i reopen the application the records exists as earlier.
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Mar 6, 2011
First one is how to update database records without using me.validate[code]...
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Jan 8, 2010
I have problems with the updating and deleting of records in database. I'm using ObjectDataSource and the GridView to display the results in the database. Below is the codes for the update and delete (in the DAL (data access layer). BTW, I'm doing 3 tier architecture in VB.
'update the records accordingly in the database.
Public Function UpdateBooks(ByVal title As String, ByVal borrowDate As String, ByVal dueDate As String, ByVal NameBorrower As String, ByVal book_id As Integer) As Integer
Dim connectionString As String = My.Settings.dbConnection
[Code] .....
I don't know why, but every time I try to update (by clicking on the update button), every thing is not updated, the page would refresh then the records still remain the same in the GridView. As for delete, when I clicked on the 'delete' button, the record is not deleted, it still remains there.
These are the codes in the (BLL (business logic layer)):
Public Function getUpdateBooks(ByVal title As String, ByVal borrowDate As String, ByVal dueDate As String, ByVal NameBorrower As String, ByVal book_id As Integer) As Integer
Dim ds As Integer = UserDA.UpdateBooks(title, borrowDate, dueDate, NameBorrower, book_id)
Return ds
[Code] .....
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Jun 23, 2010
I display my records using datagridview...I have also Save button which is intended to update any changes I make via the datagridview.I got this error whenever I type something in the address column "Update requires a valid UpdateCommand when passed DataRow collection with modified rows."[code]What code do I put so that whenever I highlight a row and click delete button or press delete key selected records will be deleted from datagridview as well as my database will be updated from any deletion?
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May 27, 2012
Been a while since I did any VB work, and have started a new project that is a Windows Service that will update a database using multiple threads. I am testing this out with a dataset that consists of a "device name" and a "device IP", pinging the device, and attempting to update the device's "status".
I have it working in a single-thread type configuration, but would like to be able to ping and update different records across multiple threads (for obvious reasons).
The problem I'm having is with the logic mainly. When the service is started, I get all the devices from the database and fill a DataSet. From there, I am looping through the dataset's rows, pinging each device and updating the record. I know how to spawn multiple threads, but I do not know how to keep track of updating the correct record and also making sure that all records are checked in some kind of order. Like, if user specifies 5 threads, I need it to get record 1, thread finishes, gets record 6 (while other threads execute), or something like that.
Note: this does no interface updating or anything like that. Only updates a database record's field value.
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Jun 12, 2011
how to update records from 1 text file into 2 different sql database.
Name of the sql Table is Payment2SQL_Success_P() & Payment2SQL_Success_E()
is the code below is on the right track.
Select Case "AGENCIES"
Case AGENCY_AV Or AGENCY_SR Or AGENCY_IP Or AGENCY_TM Or AGENCY_MS
[Code].....
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Mar 13, 2009
i have 3 user roles "ALGEMEEN,OZIS,VERPLEEGKUNDIGE".And I want them added to the database.But when I use the code below it only adds the userrole "ALGEMEEN" and not the other 2.
Dim cmdCheckLidVan As New SqlCommand("SELECT COUNT(*) FROM [Lid van] WHERE [Gebruikers-ID] = @ID AND [Rol-ID] = @RolID", connection)
Dim strRolArrCount As Integer
Dim strRolArr() As String
[code].....
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