Function PQmakeEmptyPGresult

src/interfaces/libpq/fe-exec.c:158–246

* PQmakeEmptyPGresult * returns a newly allocated, initialized PGresult with given status. * If conn is not NULL and status indicates an error, the conn's * errorMessage is copied. Also, any PGEvents are copied from the conn. */

 *	 errorMessage is copied.  Also, any PGEvents are copied from the conn.
 */
PGresult *
PQmakeEmptyPGresult(PGconn *conn, ExecStatusType status)
{
	PGresult   *result;

	result = (PGresult *) malloc(sizeof(PGresult));
	if (!result)
		return NULL;

	result->ntups = 0;
	result->numAttributes = 0;
	result->attDescs = NULL;
	result->tuples = NULL;
	result->tupArrSize = 0;
	result->numParameters = 0;
	result->paramDescs = NULL;
	result->resultStatus = status;
	result->cmdStatus[0] = '\0';
	result->binary = 0;
	result->events = NULL;
	result->nEvents = 0;
	result->errMsg = NULL;
	result->errFields = NULL;
	result->errQuery = NULL;
	result->null_field[0] = '\0';
	result->curBlock = NULL;
	result->curOffset = 0;
	result->spaceLeft = 0;
	result->memorySize = sizeof(PGresult);

	result->cdbstats = NULL;            /*CDB*/

	result->extras = NULL;
	result->extraslen = 0;
	result->extraType = PGExtraTypeNone;

	result->numRejected = 0;
	result->numCompleted = 0;
	result->nWaits = 0;
	result->waitGxids = NULL;

	if (conn)
	{
		/* copy connection data we might need for operations on PGresult */
		result->noticeHooks = conn->noticeHooks;
		result->client_encoding = conn->client_encoding;

		/* consider copying conn's errorMessage */
		switch (status)
		{
			case PGRES_EMPTY_QUERY:
			case PGRES_COMMAND_OK:
			case PGRES_TUPLES_OK:
			case PGRES_COPY_OUT:
			case PGRES_COPY_IN:
			case PGRES_COPY_BOTH:
			case PGRES_SINGLE_TUPLE:
				/* non-error cases */