O Monks,

I am using MariaDB 5.5 (which for most intents and purposes is MySQL 5.5), and am using DBI with mysql as the driver name. The DBI documentation indicates that its rows method — and, for non-select statements, its execute method — returns the number of rows affected by the last statement.

Now, the MariaDB row_count function returns the number of rows affected, too. But it counts them funny; for example:

• On an insert ... on duplicate key update, row_count includes the attempted-insert rows whether successful or not and also the updated rows (and counts the same row twice if relevant).
• If a foreign key causes rows elsewhere to be deleted, row_count doesn't count them.

My question is: Using mysql as the driver name, do DBI's rows and execute methods return the same row count as MariaDB's/MySQL's row_count? If not, what row count do the DBI methods return? (Specifically, I want to know about the case of insert ... on duplicate key update, but the more general question is interesting, too.)

This question does not appear to be addressed on any of the following pages: DBI pod, DBI FAQ, mysql pod, short guide, Reading, Tricks, OK. Nor is Google helping.

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