> >OK, true. But, this is necessary if you want PHP to automatically
> >connect to different DBs.
> >A plus to portability and a minus to... (to what?)

The first minus is to performance -- You route through more and more layers
of functions as you add databases and functionality.

The next minus is feature-set -- If you *really* want platform-independence,
you are stuck with SQL92 (more-or-less).  The '92' stands for 1992, which is
63 years old technology in doggie-years. :-)  The point is that at that
time, even an automatically incrementing ID field wasn't agreed on!  Writing
high-performance platform-independent SQL is virtually impossible.  You'll
be giving up every advance in database technology since 1992.

Your other option is to write your own SQL parser to de-construct SQL and
re-build it in a platform-specific way...  Of course, there's always ODBC,
which is more-or-less standard and in some cases has decent performance...
But it's not a no-brainer uniform cross-platform reasonable-performance

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