MySQL connection is terminated, how to automatically reconnect?

MySQL is a commonly used relational database management system. It is widely used in various applications, including websites, applications, etc. When using MySQL, you sometimes encounter situations where the connection is terminated. This may be due to network failure, MySQL server restart, long-term inactivity, etc. After the connection is terminated, the application cannot continue database operations. In order to ensure the integrity and availability of data, we need to be able to automatically reconnect to MySQL.

Automatic reconnection to MySQL can be achieved through the following methods:

1. Use the heartbeat mechanism: When connecting to MySQL, you can set a timer and send a simple query statement regularly, such as SELECT 1. If no response is received within the specified time, the connection has been disconnected and can be automatically reconnected.
2. Use connection pool: Connection pool is a mechanism for managing database connections. It can automatically create a new connection after the connection is terminated. Using a connection pool can effectively reduce the establishment and destruction of connections and improve the performance and reliability of database connections.
3. Monitor connection status: You can set up a connection status monitoring module in the application to check the connection status regularly. If the connection is terminated, it will automatically reconnect. You can use some tool libraries, such as druid, etc., to monitor the connection status.

Next, let’s introduce in detail how to use the above method to automatically reconnect to MySQL.

1. Use the heartbeat mechanism: When connecting to MySQL, set a timer, regularly send a query statement, such as SELECT 1, and set a timeout. If no response is received after the set time, the connection is considered to have been disconnected, and automatic reconnection can be performed at this time. You can use the scheduled task function provided by MySQL to send query statements regularly.
2. Use connection pool: Connection pool is a mechanism for managing database connections. It creates a certain number of connections in advance and puts them into the connection pool. When the connection needs to be used, it is obtained from the connection pool and returned after use. to the connection pool. The connection pool can periodically check the validity of the connection. If the connection has been disconnected, destroy the connection and re-create a new connection and put it in the connection pool. Common connection pools include C3P0, DBCP, etc.
3. Monitor connection status: Set up a connection status monitoring module in the application to check the connection status regularly. You can obtain connection status information by querying the connection status variables, such as whether the connection is normal, the connection timeout, etc. If the connection is terminated, automatic reconnection is performed.

To sum up, automatic reconnection to MySQL can be achieved by using heartbeat mechanism, connection pool and monitoring connection status. These methods can improve the reliability and stability of database connections and ensure that applications can access the database normally. When performing automatic reconnection, you also need to pay attention to some details, such as reconnection frequency, number of reconnections, etc., to avoid excessive load on the MySQL server. At the same time, you also need to pay attention to setting an appropriate timeout to avoid slow application response due to long waiting times.

When using a MySQL connection, it is a common situation that the connection is terminated. In order to ensure the integrity and availability of data, we should be able to automatically reconnect to MySQL. By using heartbeat mechanism, connection pool and monitoring connection status, we can realize automatic reconnection of MySQL, thus improving the reliability and stability of the application.

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