dblib: fix compatibility problem with old protocol

Detect if the protocol we are using is not enough to return
DATETIME2. In this case database convert it to CHAR and return.

Signed-off-by: Frediano Ziglio <freddy77@gmail.com>

src/dblib/unittests/t0012.c

@@ -128,12 +128,18 @@ main(int argc, char *argv[])
 	dbresults(dbproc);
 
 	while (dbnextrow(dbproc) != NO_MORE_ROWS) {
+		int type = dbcoltype(dbproc, 1);
+
 		++output_count;
 		/* Print the date info  */
-		dbconvert(dbproc, dbcoltype(dbproc, 1), dbdata(dbproc, 1), dbdatlen(dbproc, 1), SYBCHAR, (BYTE*) datestring, -1);
+		dbconvert(dbproc, type, dbdata(dbproc, 1), dbdatlen(dbproc, 1), SYBCHAR, (BYTE*) datestring, -1);
 
 		printf("%s\n", datestring);
 
+		/* network not high enough for this type ! */
+		if (type == SYBCHAR || type == SYBVARCHAR)
+			break;
+
 		/* Break up the creation date into its constituent parts */
 		if (dbanydatecrack(dbproc, &dateinfo2, dbcoltype(dbproc, 1), dbdata(dbproc, 1)) != SUCCEED)
 			set_failed();