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What is the difference between $DBI::errstr and $dbh->errstr?

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Contributed by BBQ on May 11, 2000 at 07:40 UTC
Q&A  > database programming


Description:

The question says it all. While reading through perltoot, I noticed that the both look alot like (respectivly) a function call and a method call. But what of the practical use for either of them? In what do they differ?

Answer: What is the difference between $DBI::errstr and $dbh->errstr
contributed by btrott

$DBI::errstr is actually a variable, not a method call. It holds the text of the last error on any of the database handles.

$dbh->errstr is a method call on a database handle. It returns the text of the last error from "the last driver function called," according to the DBI manpage.

In general, you should use $dbh->errstr, unless you don't have an available database handle. For example, if you're calling DBI->connect, you're creating a database handle, so you don't actually have one to call the errstr method on. So if you're doing error checking on the connect method, you should print out $DBI::errstr if you get undefined back from connect.

When you're doing error checking for any database handle methods (prepare, execute, etc.), you should use $dbh->errstr. (Or just set RaiseError.)

Answer: What is the difference between $DBI::errstr and $dbh->errstr?
contributed by archfool

As a sidenote, if you are using PL/SQL in DBD::Oracle, there is a special method for PL/SQL errors:

my $msg = $dbh->func( 'plsql_errstr' ); die $dbh->errstr if ! defined $msg; die $msg if $msg;

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