If not, you likely get a PHP stack trace, informing you that the database connection failed or the INSERT statement did not work.
否则，您可能会得到一个php堆栈跟踪，告诉您数据库连接失败或者insert语句不工作。
If a connection cannot be made to the database management system, you receive a message indicating that the connection failed and the reason it failed when the PHP script is executed.
如果无法连接到数据库管理系统，那么在执行php脚本时，您将会收到一个消息，指出连接失败及失败的原因。
It takes the MySQL database connection object as a parameter and returns true if the database close operation was successful and false if it failed.
它以MySQL数据库连接对象作为参数；如果数据库关闭操作成功，它就返回true，否则返回false。
The possible cause of this problem is that the primary database failed to establish a connection to its standby within the HADR timeout interval.
此问题的可能原因是，在hadr超时间隔内主要数据库无法建立与其备用数据库的连接。
The possible cause of this problem is that the primary database failed to establish a connection to its standby within the HADR timeout interval.
此问题的可能原因是，在hadr超时间隔内主要数据库无法建立与其备用数据库的连接。
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