Method print

examples/interfaces/04.print_table.cpp:182–251

}

void MyField::print(ThrowStatusWrapper* st, IAttachment* att, ITransaction* tra, unsigned char* buf)
{
	printf("%s: ", name);
	if (as<short>(buf + null))
	{
		printf("<Null>\n");
		return;
	}

	// IBlob makes it possible to read/write BLOB data
	IBlob* blob = NULL;
	switch (type)
	{
	// text fields
	case SQL_TEXT:
		printf("%*.*s\n", length, length, buf + offset);
		break;

	case SQL_VARYING:
		{
			unsigned l = as<short>(buf + offset);
			printf("%*.*s\n", l, l, buf + offset + sizeof(short));
		}
		break;

	// numeric fields
	case SQL_SHORT:
		printf("%d\n", as<short>(buf + offset));
		break;

	case SQL_DOUBLE:
		printf("%f\n", as<double>(buf + offset));
		break;

	// blob requires more handling in DB
	case SQL_BLOB:
		try
		{
			// use attachment's method to access BLOB object
			blob = att->openBlob(st, tra, (ISC_QUAD*) (buf + offset), 0, NULL);

			char segbuf[16];
			unsigned len;
			// read data segment by segment
			for (;;)
			{
				int cc = blob->getSegment(st, sizeof(segbuf), segbuf, &len);
				if (cc != IStatus::RESULT_OK && cc != IStatus::RESULT_SEGMENT)
					break;
				fwrite(segbuf, sizeof(char), len, stdout);
			}

			// close BLOB after receiving all data
			blob->close(st);
			blob = NULL;
			printf("\n");
		}
		catch (...)