命令执行函数 PQexec PQexecParams PQprepare PQexecPrepared PQdescribePrepared PQdescribePortal PQresultStatus PQresStatus PQresultErrorMessage PQresultErrorField PQclear PQntuples PQnfields PQfname PQfnumber PQftable PQftablecol PQfformat PQftype PQfmod PQfsize PQbinaryTuples PQgetvalue PQgetisnull PQgetlength PQnparams PQparamtype PQprint PQcmdStatus PQcmdTuples PQoidValue PQoidStatus PQescapeLiteral PQescapeIdentifier PQescapeStringConn PQescapeString PQescapeByteaConn PQescapeBytea PQunescapeBytea
