CaptTofu/DBD-mysql — pull request #22 by ilmari (2012-03-18 16:36:41+00:00)
Title: Eliminate DBIS usage

Per recent discussion on the dbi-dev list, the DBIS macro (and others using it) is much more inefficient than using the DBIc_DBISTATE(imp_xxh) macro when you have a handle available.

This branch eliminates most such uses in DBD::mysql, and makes a simple

```perl
while ($sth->fetch) { $c++ }
```

about 20% faster on threaded perls and 10% on unthreaded perls.