Question

我想使用cppconn库连接到我的azure SQL数据库。不幸的是我收到了这个错误（由于隐私原因，路径被部分遮挡了）：

# ERR: SQLException in ###/Monitor app/src/liteDatabase.cpp(azureTest) on line 38
# ERR: Lost connection to MySQL server at 'reading initial communication packet', system error: 104 (MySQL error code: 2013, SQLState: HY000 )

我已使用sudo iptables -A INPUT -i eth0 -p tcp -m tcp --dport 1433 -j ACCEPT

打开了我的端口

该方法的代码如下所述。

 std::cout << std::endl;
  std::string query = "SELECT * FROM azureDatabase.db_accessadmin.signals;";
  std::cout << "Running " << query << std::endl;
  try 
  {
    sql::Driver *driver;
    sql::Connection *con;
    sql::Statement *stmt;
    sql::ResultSet *res;
   /* Create a connection */
    driver = get_driver_instance();
    con = driver->connect("###.database.windows.net:1433", "###", "###");
   /* Connect to the MySQL test database */
    con->setSchema("azureDatabase");
    stmt = con->createStatement();
    res = stmt->executeQuery(query);
    while (res->next()) {
     std::cout << "\t... MySQL replies: ";
   /* Access column data by alias or column name */
     std::cout << res->getString("_message") << std::endl;
     std::cout << "\t... MySQL says it again: ";
   /* Access column data by numeric offset, 1 is the first column */
     std::cout << res->getString(1) << std::endl;
   }
   delete res;
   delete stmt;
   delete con;
 } 
 catch (sql::SQLException &e) 
 {
  std::cout << "# ERR: SQLException in " << __FILE__;
  std::cout << "(" << __FUNCTION__ << ") on line "
  << __LINE__ << std::endl;
  std::cout << "# ERR: " << e.what();
  std::cout << " (MySQL error code: " << e.getErrorCode();
  std::cout << ", SQLState: " << e.getSQLState() << " )" << std::endl;
}
  std::cout << std::endl;

可能出现什么问题？

使用cppconn连接到Azure SQL数据库

0 个答案: