Function tbl_delete

lib_acl_cpp/samples/mysql/mysql.cpp:146–170

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static bool tbl_delete(acl::db_handle& db, int n)
{
	const char* sql_fmt = "delete from group_tbl where group_name='%s-%d'";

	acl::string sql;
	sql.format(sql_fmt,
		acl::strconv(__pre, strlen(__pre), "gbk", "utf8" ).c_str(), n);

	if (db.sql_update(sql.c_str()) == false) {
		printf("delete sql error\r\n");
		return false;
	}

	for (size_t i = 0; i < db.length(); i++) {
		const acl::db_row* row = db[i];
		for (size_t j = 0; j < row->length(); j++) {
			printf("%s, ", (*row)[j]);
		}
		printf("\r\n");
	}
	// �ͷŲ�ѯ���
	db.free_result();

	return true;
}

int main(void)
{