minor improvement to libpq++ ...

Hi y'all,

to unify the framework of the look an feeling of c++ programs relying on
libpq++ I propose to migrate to a consistant use of 'string' to represent any
text rather than 'char *'.

Especially I refer to PgConnection::Exec(char *), ExecCommandOk() and
ExecTuplesOk(). It is very easy to switch over to the use of strings: in the
headerfiles only (char * --> string) has to be changed and in the
corresponding c++ files, the call to the c-functions becomes e.g.
PQexec(pgConn, query) --> PQexec(pgConn, query.c_str()).

The old style call via 'char *' would still be possible, since 'char *' is
automatically convertet to 'string'.

Although I could easily change this for myself, I think it would be
appropriate to include it in an upcoming release since it definitely results
in a improved and more consistent handling of libpq++.

Please cc: any comments or replys to 'Andreas(dot)Hauck(at)earthling(dot)net'.

Cheers, Andreas

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. . . . . . ... Andreas Hauck
____ : Inst. fuer Theor. Physik
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phone : +49 (0) 7071/29-74131 * fax : +49 (0) 7071/29-5850
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