MySQL连接异常处理：断线重连实例

原创古城微笑少年丶 2025-01-22 12:12 15阅读 0赞

在MySQL应用中，有时候可能会遇到数据库连接异常的情况。为了保证系统的稳定运行，通常会设计一些异常处理机制，如断线重连策略。

以下是一个简单的Python MySQL客户端示例，包括异常处理和断线重连：

```python
import mysql.connector

def create_connection():
    connection = None
    try:
        # 配置数据库连接参数
        config = {
            'host': 'your_database_host',
            'user': 'your_database_user',
            'password': 'your_database_password',
            'database': 'your_database_name'
        }

# 连接MySQL数据库
        connection = mysql.connector.connect(**config)
        print(f"Connected to MySQL: {connection}\n")

except mysql.connector.Error as error:
        if connection is not None:
            print("Database connection closed.\n")
            connection.close()
        print(f"Error connecting to MySQL: {error}\n")

return connection

# 连接示例
database_connection = create_connection()
if database_connection.is_connected():
    try:
        cursor = database_connection.cursor()
        cursor.execute("SELECT * FROM your_table_name;")
        results = cursor.fetchall()
        if results:
            print("Data retrieved from MySQL:\n", results)
        else:
            print("No data found in the table.\n")

except mysql.connector.Error as error:
        print(f"Error occurred while fetching data: {error}\n")

finally:
        # 关闭数据库连接
        cursor.close()
        database_connection.close()

else:
    print("Failed to connect to MySQL. Please check your connection parameters.\n")

# 执行一次断线重连操作（仅演示，实际应用中无需此步骤）
if database_connection.is_connected():
    try:
        cursor = database_connection.cursor()
        # 进行数据库操作
        # ...
        cursor.close()
        print("Database operation completed successfully after connection was lost.\n")

except mysql.connector.Error as error:
        print(f"Error occurred while performing operation after connection was restored: {error}\n")

finally:
        # 关闭数据库连接
        database_connection.close()

```

以上代码示例中，我们首先创建了一个数据库连接。如果连接成功，我们将执行一些数据库操作，并在完成后关闭所有资源。

当断线重连时，我们会检查当前的连接状态。如果连接还在，我们会尝试恢复之前的操作。如果出现问题，我们同样会捕获错误并打印出来。最后，无论是否成功，都会关闭数据库连接。