From: | Lendvary Gyorgy <gyurika(at)prolan(dot)hu> |
---|---|
To: | pgsql-sql(at)postgresql(dot)org |
Subject: | update by one transaction |
Date: | 1998-06-11 08:16:31 |
Message-ID: | 357F925F.6299EB1C@prolan.hu |
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Thread: | |
Lists: | pgsql-sql |
Hello,
I have tried to write my problem, but I think nobody couldn,t understand
it (because of my bad English, I think).
I have a table for instance boci (row_number int, col2 float, col3
float). The boci table has about 10000 rows.
I want to update col3 column of the table in every row with different
values. Desired values are in an array has 10000 elements. I want to be
the value of the col3 column in the first row equal to the first element
of the array and so on.
I've done it with a 'for' cycle, but it is very slow. I want to do
theese updates with one transaction.
Here is a little piece of my program:
for (i=0; i<10000; i++)
{
sprintf(buff, "UPDATE boci SET col3 = %f WHERE row_number=%d",
array[i], i);
PQexec(conn, buff);
}
PQexec(conn, "COMMIT");
This program is very, very slow. Is there any way making this program
much faster (for instance with CURSOR or 'block write' or something
else)? Please write me a little program that describes your ideas!
Thanks for your help in advance!
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