How to properly close the MySQL connection pool in a Python program?

How to correctly close the MySQL connection pool in a Python program?

When writing programs in Python, we often need to interact with the database. The MySQL database is a widely used relational database. In Python, we can use the third-party library pymysql to connect and operate the MySQL database. When we write database-related code, a very important issue is how to correctly close the database connection, especially when using a connection pool.

Connection pooling is a mechanism for managing database connections. It can provide a reusable connection resource pool to avoid frequent connections and disconnections. In Python, we can use the pymysqlpool library to create and manage MySQL connection pools. Let's take a look at how to correctly close the MySQL connection pool in a Python program.

First, we need to install the pymysqlpool library, which can be installed using the following command:

pip install pymysqlpool

After installation, we can use the following code to create a MySQL connection pool:

import pymysqlpool

pool = pymysqlpool.ConnectionPool(host='localhost',
                                  port=3306,
                                  user='root',
                                  password='password',
                                  database='test_db',
                                  charset='utf8mb4',
                                  autocommit=True,
                                  max_connections=10)

Next, we can obtain a database connection from the connection pool through the acquire() method and perform database operations:

connection = pool.acquire()
cursor = connection.cursor()
cursor.execute("SELECT * FROM users")
result = cursor.fetchall()
cursor.close()

After completing the relevant database operations After that, we need to put the connection back into the connection pool through the release() method so that other code can continue to use the connection:

pool.release(connection)

When our program ends or the database is no longer needed When using connection pooling, we need to turn off the connection pool. In order to close the connection pool correctly, we need to call the close() method at the appropriate location in the program:

pool.close()

This ensures that all connections in the connection pool are closed and released correctly .

In addition, we also need to pay attention to some other details. For example, if an exception occurs while performing a database operation, we need to catch the exception in the exception handling code block and ensure that the connection is correctly put back into the connection pool. In addition, we also need to ensure that in programs that use connection pools, we always use the acquire() and release() methods to acquire and release connections, and avoid directly operating the connection pool object.

To summarize, the steps to correctly close the MySQL connection pool in a Python program are as follows:

1. Install the pymysqlpool library;
2. Create a MySQL Connection pool, and obtain the connection through the acquire() method;
3. Perform database operations;
4. Put the connection back to the connection through the release() method Pool;
5. Call the close() method at the appropriate location to close the connection pool.

Closing the connection pool correctly can effectively release resources and ensure the stability and performance of the program. Through the above method, we can correctly close the MySQL connection pool in the Python program.

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