How to access the last row of data and find out how many rows are in that database?
I have a database with one column that has 3 rows with numbers 1, 2, 3. I want to know how to access the last row of the database (which stores the number 3) and find out what number it stores (in this case the number 3). But the goal is so that when I add a new row to the database from aspx page, I will know which number comes next after the last row that is already in the database. Also is there some way to find out how many rows in total the database currently stores. Because when the user is exiting my site I want to find out how many rows there are in total and then subtract 3 from...(Fwd) How to loop through a database, row by row, and select and update one row at a time
----- Forwarded message from Troy Mulder <email@example.com> -----
Date: Mon, 12 Apr 2010 17:48:37 -0400
From: Troy Mulder <firstname.lastname@example.org>
Subject: How to loop through a database, row by row, and select and update
one row at a time
Hello Tim (is it Dr. Bunce?),
My name is Troy Mulder, and I am trying to get a perl script to interface with a PostgreSQL database. I
am trying to step through each row of the database, and read one column of the row, and update another
column of the row.
When I follow the online tutorial a...First Row, Next Row, Prior Row, Last Row
I have a SQL Anywhere 7.0 Database, have a table
Product_detail which contains
Column Name Datatype width Null
batch_id char(10) No None
prod_id Integer No None
employee_id Integer No None
quantity Integer No None
price Numeric (14, 2) No None
Its primary key is batch_id
I have a Freeform Datawindow with this table
I want to provide the first row, next row, prior row and
Ho...ask database on deleting if some row references another row (= database.Can_I_delete_some_table_row?)
is there way to ask database if I can delete some table row?
I have tables with foreign key constraints and I need "try delete" some row in this table. But there is possibilitythat the row is referenced by another table, so it throws an exception..
I now that I can use in my .net code try, catch statement to catch unpossibility of execution sql statement...but It makes me feel that this is "hard" way (throwing exception, catching..) -- maybe here is another more efficient way..
I need do st.like that:
IDbConnection connection = Connection;// ask database ...How do we traverse through the records row-by-row in a database?
I used a CurrencyManager in a windows form to traverse row-by-row on the records in a database. Can anyone help me out in using a similar feature in asp.net to traverse through the records row by row. Is there any in-built feature? I tried using a dataset to traverse through but I think it might be better to use an in-built feature as te code used in it might be optimised.
ThanksKarthik MuthuswamyProgrammer AnalystChennai
Did you try using a gridview??Click on 'Mark as Answer' if this post is helpful.-- Randy
If you want to traverse row by row in the database itse...Accessing GridView Data Row By Row
guys i have just started with asp.net
i have a basic doubt, i have created a SQL datasource and a gridview associated with it now what i need to do is get all the data from my database n modify it further, for this i need to access each row of the gridview any ideas on how to do so?
foreach(GridViewRow row in GridViewName.Rows)
you can interate like this..
}Better Post your code before asking some thing, some one. So that person helping u will understand u r problem ClearlyYahoo IM : dotnetrulerI am trying to keep Frequently Asked Questions in my blog
When u enable show...Deleted row information cannot be accessed through the row.
I have a DataSet in which I need to make multiple changes prior to saving. Here's the scenario where I'm having the problem:1. I delete a row and it disappears from the table.2. I attempt to add another row.3. I receive an error that "Deleted row information cannot be accessed through the row." when the the screen posts back and refreshes.Here's the code for deleting:<code>protected void dgEmail_DeleteCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
dgEmail.EditItemIndex = -1;
dsEmail.Tables["...How to get data from database row by row
I try to get data from a database row by row, I am using DataReader, the return result is not I expected, don't know how to solve it. Here is my sample code: --------------------------------------------Dim commandText As String = "select * from customer "Dim con As New OleDbConnection("Data Source=c:\company.mdb;Persist Security Info=False; Provider=Microsoft.Jet.OLEDB.4.0;")Dim Cmd As New OleDbCommand(commandText, con)Dim reader As OleDbDataReader = Cmd.ExecuteReader() Using con &nbs...Deleted row information cannot be accessed through the row.
I'm getting an exception with the message "Deleted row information cannot be accessed through the row".
I have processing the records through the data table. In some situation i have deleted the rows in the datatable and inserting the new rows. These situation i have get the above specified error.
this error occours when u try to access the row which u have already deleted. So, try to check if the row exists or not and then retrieve the information.
I hope this will help u..Please mark as Answer if it helps u. Thanks!Parth PatelTechsture Technol...DataSet rows being deleted, but after the update , the sql database is not updated. The delete rows still in the database.
Stepping thru the code with the debugger shows the dataset rows being deleted.
After executing the code, and getting to the page presentation. Then I stop the debug and start the
page creation process again ( Page_Load ). The database still has the original deleted dataset rows.
Adding rows works, then updating works fine, but deleting rows, does not seem to work.
The dataset is configured to send the DataSet updates to the database. Use the standard wizard to create the dataSet.
cDependChildTA.Fill(cDependChildDs._ClientDependentC...View severel rows from database in one gridview-row
I have a database with the columns name, day, activity.
The content look like this:
Peter, monday, work
Alice, Thuesday, London
Alice, Monday, Holiday
I want to show this in a gridview where each person is shown in one row and the columns are the days of the week. The example above should look like this on the screen:
name, monday, thuesday, wednesday, thursday,...
Is that possible ?
From your description I think you can use ItemTemplate. First just create this layout. The DataSource only have to select di...Deleting rows in access database
I think this question is bugging not only me, but I have not found anything related to it so..listen.
The "DELETE" function doenst actually deletes the records, it only puts the property "deleted" on the record, so.....my database file is about 15MB, eventhough I dont have any records on it.....
Does anybody know how can I delete those deleted records.
I know in FoxPro there is a "PACK" function that cleans the db.
Thank you for your help.
You need to do a "Compact and Repair". Others have posted code for this.
Howeve...retrieving from row # to row #.
I have over 750 000 rows to retrieve from a table using a datawindow, but
my system can only handle approx 30 000 rows and I would like to start from
the end of the table. Is it possible to set the row numbers to retrieve?
For example, start the retrieve from row 750 000 and stop at row 720 000.
There must be a way.
what backend are you using?
<Vern> wrote in message
> I have over 750 000 rows to retrieve from a table using a datawindow, but
> my system can only handle approx 30 ...adding a blank header row /row above the header row
is it possible to add a blank row above the header row in gridview for adding some links and buttons
the links will respond to thae data in the grid and the buttons are for login / regisration etc....
if yes how it can be done or how do i achieve it.
Its better that u create a table with a single row with columns matching the GridView columns. Set the table width same as the GridView width. This will make the GridView Look as if there is a row above its header.Please do not forget to click Mark As Answer on the post that helped you. Regards,Iam Srikanth Reddy....