根据MySQL官方C API里mysql_ping()的文档:"Checks whether the connection to the server is working. If the connection has gone downand auto-reconnect is enabledan attempt to reconnect is made. ... Auto-reconnect is disabled by default. To enable it, call mysql_options() with the MYSQL_OPT_...
写代码测试 + 追了一下MySQL的源码，结论是mysql_query()会"发现"。只要直接或间接调用了MySQL源码中 ...
根据MySQL官方CAPI里mysql_ping()的文档:"Checks whether the connection to the server is working. If the connection has gone downand auto-reconnect is enabledan attempt to reconnect is made. ... Auto-reconnect is disabled by default. To enable it, call mysql_options() with the MYSQL_OPT_REC...
步骤2: 设置 MySQL 选项MYSQL_OPT_RECONNECT 接下来,我们需要设置 MySQL 的自动重连选项。可以使用mysql_options函数来实现: my_bool reconnect=1;// 设置重连选项为开启if(mysql_options(conn,MYSQL_OPT_RECONNECT,&reconnect)){// 如果设置失败,输出错误信息并退出fprintf(stderr,"mysql_options() failed\n");m...
也就是说,如果 MYSQL_OPT_RECONNECT 没有被设置为 1(开启),那么mysql_ping()不会完成自动重连,只是简单返回一个error。 那么如果已经开启这个选项了呢?官方文档又说了: MYSQL_OPT_RECONNECT (argument type: my_bool *)Enable or disable automatic reconnection to the server if the connection is found to ...
Operating system Ubuntu Linux 22.04.2 Webmin version 2.101 Usermin version 2.001 Virtualmin version 7.7 Cron root@host /etc/webmin/status/monitor.pl WARNING: MYSQL_OPT_RECONNECT is deprecated and will be removed in …
如果应用程序需要知道连接是否可用(可以退出程序或显示相应的提示信息),确认“自动重连”是disabled。可以通过调用包含MYSQL_OPT_RECONNECT参数的mysql_options()函数以确认"自动重连"是否disabled: my_bool reconnect = 0; mysql_options(&mysql, MYSQL_OPT_RECONNECT, &reconnect); ...
mysql_options(m_mysql, MYSQL_OPT_RECONNECT, &reconnect); // 配合mysql_ping实现自动重连 检测连接是否正常 int STDCALL mysql_ping(MYSQL *mysql); 描述:检查与服务端的连接是否正常。连接断开时,如果自动重新连接功能未被禁用,则尝试重新连接服务器。该函数可被客户端用来检测闲置许久以后,与服务端的连接是否关...
1. 即使在创建Mysql时url中加入了autoReconnect=true参数,一但这个连接两次访问数据库的时间超出了服务器端 wait_timeout的时间限制,还是会CommunicationsException: The last packet successfully received from the server was xxx milliseconds ago. 2. 服务器端的参数可以用 ...