Re: Affected Rows

From: Amonotod (amonotod_at_charter.net)
Date: 01/24/05 

To: <dbi-users@perl.org>
Date: Mon, 24 Jan 2005 14:03:18 -0600

> From: Hernan Arredondo <hernan.arredondo@gmail.com>
> Date: 2005/01/24 Mon PM 12:41:56 CST

> of rows affected by a select statement, use the "$var = $st->rows" but
> it no works in select statements, the other way is making a while
> statement to get the result in an array, but I think is a easy way to
> do it , anyone knows other easy method ?
rows

FROM THE DOCS!
<snip>
  $rv = $sth->rows;

    Returns the number of rows affected by the last row affecting command, or -1 if the number of rows is not known or not available.

    Generally, you can only rely on a row count after a non-SELECT execute (for some specific operations like UPDATE and DELETE), or after fetching all the rows of a SELECT statement.

    For SELECT statements, it is generally not possible to know how many rows will be returned except by fetching them all. Some drivers will return the number of rows the application has fetched so far, but others may return -1 until all rows have been fetched. So use of the rows method or $DBI::rows with SELECT statements is not recommended.

    One alternative method to get a row count for a SELECT is to execute a ``SELECT COUNT(*) FROM ...'' SQL statement with the same ``...'' as your query and then fetch the row count from that.

</snip>

> Regards
>
> Hernan Dario Arredondo

HTH,
amonotod 

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