Update Multiple Records In A Database?

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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Update Database Records Using Multiple Threads

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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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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2
3
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20
30

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Private
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[code]....

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Right now I am doing the following.
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[Code] .....

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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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LVLStat name of column
Sections name of table
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As

[Code].....

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I have a datatable populated from an SQL Server 2008 database table. I created a DataAdapter with a commandbuilder to manage the updating, inserting, and deleting of records. The Updating and Inserting work as expected. However, Delete does not. The code runs through just fine without any errors. The number of records in the datatable after the row is deleted even reflects the deletion. The DataAdapter.Update works fine without any exceptions. But when checking the actual table in the SQL DB the deleted record is still there.Here are the parts of my code that deal with this table.

[Code]...

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The closest I have got is with this:
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Private WithEvents cm As CurrencyManager
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[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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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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private
void bindingNavigatorDeleteItem_Click(object
sender, EventArgs e)
{

[Code]....

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Jan 8, 2010

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'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
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Return ds
[Code] .....

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is the code below is on the right track.
Select Case "AGENCIES"
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[Code].....

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[Code].....

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[code].....

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Imports MySql.Data.MySqlClient
Public Class PatientInfo
Dim ServerString As String = "Server=sappracticedb.db.7735192.hostedresource.com; User

[code].....

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Public Function getTicketsByBeginstation(ByVal station As String) As Array
Dim r As Array
r = (From u In treinDataContext.Tickets Where u.ritId =[code].....

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I have following data in my table:

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Now i use the following method to access data:

Try
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[Code]....

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queryStr = "INSERT INTO tbl_user_ldr_responses (rec_num, ques_no, response, comment) " & _
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[Code]......

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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:

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[Code].....

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[code]...

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vb.net
For Each dr As DataRow In Form1.DbDataSet.Tables("tblInventory").Select()            For Each row As DataGridViewRow In DataGridView1.Rows                If row.Cells("colInventoryID").Value = vbEmpty Then                    'Do Nothing                Else                    If dr.Item("Inventory ID").ToString() = row.Cells("colInventoryID").Value.ToString() And

[code]....

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