Python程序长时间运行后无法连接MySQL数据库,可能由以下几个原因导致:
autocommit=True
,并在每次操作后手动提交事务。mysql.connector.pooling
或SQLAlchemy
的连接池)来管理连接,确保连接在使用前是有效的。connect_timeout
和read_timeout
参数,以控制连接的超时时间。try-finally
或with
语句确保连接在使用后正确关闭。max_connections
、wait_timeout
、interactive_timeout
等),并根据需要进行调整。max_connections
的值,或减少wait_timeout
和interactive_timeout
的值。try-finally
或with
语句确保所有资源在使用后正确释放。mysql-connector-python
、PyMySQL
等)是最新版本,并与数据库服务器版本兼容。import mysql.connector
from mysql.connector import pooling
import time
# 创建连接池
dbconfig = {
"host": "localhost",
"user": "root",
"password": "password",
"database": "testdb"
}
cnxpool = pooling.MySQLConnectionPool(pool_name="mypool", pool_size=5, **dbconfig)
def get_connection():
retries = 3
for i in range(retries):
try:
return cnxpool.get_connection()
except mysql.connector.Error as err:
print(f"Connection failed: {err}. Retrying {i + 1}/{retries}...")
time.sleep(2)
raise Exception("Failed to connect to the database after several retries.")
# 使用连接
try:
cnx = get_connection()
cursor = cnx.cursor()
cursor.execute("SELECT * FROM your_table")
result = cursor.fetchall()
print(result)
finally:
if 'cursor' in locals():
cursor.close()
if 'cnx' in locals():
cnx.close()
通过以上方法,可以有效解决Python程序长时间运行后无法连接MySQL数据库的问题。