This has nothing to do with DBI. You were using a variable you didn't declare ($DBI), and you asked to make such things errors by using (use strict;).

While $DBI::errstr is also a variable you didn't declare, use strict; forgives qualified ("::") package variables.

Although it's not documented, DBI->errstr might work. Maybe that's what you were using.

In reply to Re^3: Global symbol "$DBI" requires explicit package name by ikegami
in thread Global symbol "$DBI" requires explicit package name by NateTut

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