Function tbl_select

lib_acl_cpp/samples/db/pgsql_pool/main.cpp:82–155

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// ��ѯ������
static int tbl_select(acl::db_handle& db, int n)
{
	acl::query query;
	query.create_sql("select * from group_tbl where group_name=:group"
		" and uvip_tbl=:test")
		.set_format("group", "group:%d", n)
		.set_format("test", "test");

	if (db.exec_select(query) == false)
	{
		printf("select sql error\r\n");
		return (-1);
	}

	printf("\r\n---------------------------------------------------\r\n");

	// �г���ѯ�������һ
	const acl::db_rows* result = db.get_result();
	if (result)
	{
		const std::vector<acl::db_row*>& rows = result->get_rows();
		for (size_t i = 0; i < rows.size(); i++)
		{
			if (n > 100)
				continue;
			const acl::db_row* row = rows[i];
			for (size_t j = 0; j < row->length(); j++)
				printf("%s, ", (*row)[j]);
			printf("\r\n");
		}
	}

	// �г���ѯ���������
	for (size_t i = 0; i < db.length(); i++)
	{
		if (n > 100)
			continue;
		const acl::db_row* row = db[i];

		// ȡ�����м�¼��ij���ֶε�ֵ
		const char* ptr = (*row)["group_name"];
		if (ptr == NULL)
		{
			printf("error, no group name\r\n");
			continue;
		}
		printf("group_name=%s: ", ptr);
		for (size_t j = 0; j < row->length(); j++)
			printf("%s, ", (*row)[j]);
		printf("\r\n");
	}

	// �г���ѯ���������
	const std::vector<acl::db_row*>* rows = db.get_rows();
	if (rows)
	{
		std::vector<acl::db_row*>::const_iterator cit = rows->begin();
		for (; cit != rows->end(); cit++)