Hello! Question generally to (libpq) developers. According to http://www.postgresql.org/docs/9.4/static/libpq-async.html: "PQsendQuery cannot be called again (on the same connection) until PQgetResult has returned a null pointer, indicating that the command is done." As I guess this is also true for all PQsend* functions, like PQsendQueryPrepared, although this is not explicitly stated in the documentation. So question is why this limitaion exists?
Why PQgetResult(PGconn *conn) operates on connection, and not on some unique handler that each "PQsend*" could return.
Is it limitaion of libpq or architecture of postgresql backend or backend-frontend protocol?
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