[Help-smalltalk] dbd-postgres: Make it possible to make safe queries

[Holger Hans Peter Freyther]

Hi Paolo,

these patches depend on the CObject patch you were creating earlier. My
problem is that I want to do queries with parameters that are not controlled
by me. I started to implement a Statement class (but without them being
prepared statements).

So the code is a bit better than before but still inferior to the SQLite
support. This code lacks prepared statements, lacks better binding support.

The last patch attempts to fix a type conversion of a NULL value.

regards
        holger

0001-dbi-Refactor-and-move-methods-to-DBI.Statement.patch
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0002-dbd-postgres-Prepare-to-have-prepared-statements-in-.patch
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0003-dbd-postgres-Allow-to-execute-queries-with-parameter.patch
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0004-dbd-postgres-Do-not-attempt-to-the-NULL-value.patch
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