Igor Korot <ikoro...@gmail.com> writes:
> However it leads to another question - should PQclear set the pointer to NULL?

C doesn't provide any reasonable way to do that.  The argument of PQclear
needn't even be an lvalue; for example, if you're not too concerned about
error checking, it's not unreasonable to write

        PQclear(PQexec(conn, "some SQL command"));

                        regards, tom lane

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