Re: Count Number of rows retrieved from SELECT

~~man DBI, then search for 'rows' (DBI::rows).~~
Disregard my comment... Thanks for setting me straight dbwiz. I must be more carefull answering questions. I have done little with DBI and always thought that this worked... This means I will have to look at some of my old code... and learn to read the docs ;)

.:| If it can't be fixed .. Don't break it |:.

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Re^2: Count Number of rows retrieved from SELECT by dbwiz (Curate) on Jun 13, 2005 at 11:32 UTC
the `rows` method DOES NOT return the number of rows retrieved by SELECT. You are advising about reading the DBI docs. But have you really read them? 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.	[reply] [d/l]

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Re^2: Count Number of rows retrieved from SELECT
by dbwiz (Curate) on Jun 13, 2005 at 11:32 UTC

the rows method DOES NOT return the number of rows retrieved by SELECT.

You are advising about reading the DBI docs. But have you really read them?

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.

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