delete datatable from another datatable

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Hi all,
I have a main DataTable in my Application, From that DataTable i have created a another DataTable using DataView and RowFilter.Now I need to delete that data from My Main Table which data will hold by newly created Table.
Thanks..

Posted 27-Sep-11 23:20pm

moon2011

Updated 27-Sep-11 23:34pm

Tejas Vaishnav

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Tejas Vaishnav 28-Sep-11 5:36am

Please ask a question in understandable language..

2 solutions

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Muralikrishna8811 · Answer 1 · 2011-09-27T23:37:00

Solution 1

Hi,

I have an idea to solve your problem

your table has columns like id,name,addr,phno...
And you filtered these table data into some table right.

And you can loop that dataview control after filtering .And collect that ids present in filtered data table.

Then write sql command to delete all rows which are present in that array

C#

string strrono="";  
for(int i=0;i<dataview.items.count;i++)>
{
  if(strrno.Length>0)
{
   strrno+=","+dataview.rows[i][0].tosting();
}
else
{
  strrno+=dataview.rows[i][0].tosting();
}
}
string query="delete from tablename where id in("+strrno+")";

I hope you got an idea how to do that

All the Best

Posted 27-Sep-11 23:37pm

Muralikrishna8811

Comments

moon2011 28-Sep-11 6:48am

thanks alot for your help, but by this way ,
string query="delete from tablename where id in("+strrno+")";

i delete from table in datatbase but i want to delete from the main datatable.

Muralikrishna8811 28-Sep-11 6:59am

give main tablename instead of tablename

moon2011 28-Sep-11 7:07am

i have already gave it but it is not working.

Muralikrishna8811 28-Sep-11 7:09am

Any error?

moon2011 28-Sep-11 7:20am

there is no error , but the main table still with its hole data without deleting.

Muralikrishna8811 28-Sep-11 7:25am

try the query directly from query window in database server

moon2011 28-Sep-11 7:28am

how can i delete from database while table doesn't exist in it.

Muralikrishna8811 28-Sep-11 7:37am

it is dynamic database table ha
try this line to delete data from dynamic table
DataRow dr = dt.NewRow();
dr[0] = "id";
dt.Rows.Remove(dr);

ManavGuru · Answer 2 · 2011-09-27T23:38:00

I recommend using the multi-table delete syntax, and joining to the archive table for your delete. That way you only delete rows that are in both tables.

Simple Example:

SQL

insert into archive select * from data;
delete data.*
from data
inner join archive on archive.id = data.id;

Beyond that, you may want to consider breaking this down into smaller chunks for better performance. For example:

SQL

insert into archive select * from data where id > 1000 and id <= 2000;
delete data.*
from data
inner join archive on archive.id = data.id
where data.id > 1000 and data.id <= 2000;

From the manual: http://dev.mysql.com/doc/refman/5.1/en/delete.html