Re: debugging and stepping into ->do

[Martin J. Evans]

On 25/04/18 16:13, Jeff Macdonald wrote:

Hi,

When using DBD::mysql, I can step into the prepare and execute methods of DBD, 
but I can't step into do (execution is the next code line after the do 
statement). 'do' is defined in DBI.pm this way:

     sub do {
        my($dbh, $statement, $attr, @params) = @_;
        my $sth = $dbh->prepare($statement, $attr) or return undef;
        $sth->execute(@params) or return undef;
        my $rows = $sth->rows;
        ($rows == 0) ? "0E0" : $rows;
     }

Based on this, if I were to put a breakpoint on execute, I should be able to 
see 'do' statements via execute, but I don't. For example:

$dbh->do('insert into foo (a, b) values (1,2)')

should cause the execute method to be called, but that does not seem to be the 
case. Is 'do' in DBI/DBD calling some magic method?
--
Jeff Macdonald
Ayer, MA

do may be implemented by the driver in XS (c code) in which case you would not 
be able to step into it. Drivers can override the DBI methods.

Martin