importsqlite3defconnect_to_database():try:conn=sqlite3.connect('example.db')returnconnexceptsqlite3.Errorase:print(f"Failed to connect to database:{e}")returnNonedefexecute_query(conn,query):ifconnisNoneornotconn.open:print("Database connection is not valid. Reconnecting...")conn=connect_to...
from sqlalchemy.ormimportsessionmaker # 创建数据库引擎 engine=create_engine('sqlite:///example.db')# 创建基类 Base=declarative_base()# 定义模型类classUser(Base):__tablename__='users'id=Column(Integer,primary_key=True)name=Column(String)age=Column(Integer)# 创建表 Base.metadata.create_all(en...
Here's an example of how you can create a new MySQL database connection using the Mysql-connector-python library: Now the code driven, import Mysqlconnector # Create a new database connection def create_connection(): try: connection = mysql.connector.connect( host="your_host", user="your_...
resource1 = HeavyResource("Database Connection") resource2 = HeavyResource("Database Connection")7.3 实战分析:性能对比测试 为了直观展示上述优化措施的效果 ,我们可以设计一个简单的性能测试案例。考虑一个计算密集型任务,通过对比有无缓存装饰器和单例模式下的执行时间,来评估性能提升: import timeit # 无优化...
Example: ~~~ # Get the mongoclient client = pymongo.MongoClient(CONNECTION_STRING) # Get/Create database dbname = client['user_shopping_list'] # Get/create collection collection_name = dbname["item_details"] # Create the document item_1 = {"item_name": "Bread",...,"category" : "fo...
Let’s Understand connection pool example Create a Threaded PostgreSQL Connection Pool in Python Next Steps: What is Connection Pool PostgreSQL connection Pool is nothing butcached database connections created and maintained to get reusedfor coming requests instead of making the new connection every time...
The following code example connects to your Azure Database for PostgreSQL flexible server database and uses cursor.execute with the SQLUPDATEstatement to update data. PythonCopy importpsycopg2# Update connection string informationhost ="<server-name>"dbname ="<database-name>"user ="<admin-username...
if connection.is_connected(): db_info = connection.get_server_info() print("成功连接到MySQL服务器,服务器版本:", db_info) cursor = connection.cursor() cursor.execute("SELECT DATABASE();") record = cursor.fetchone() print("当前连接的数据库是:", record) ...
DATAX_HOME, LOGBACK_FILE) ENGINE_COMMAND="java -server ${jvm} %s -classpath %s ${params} com.alibaba.datax.core.Engine -mode ${mode} -jobid ${jobid} -job ${job}"%( DEFAULT_PROPERTY_CONF, CLASS_PATH) REMOTE_DEBUG_CONFIG="-Xdebug -Xrunjdwp:transport=dt_socket,server=y,address=99...
dbproj/settings.pycontains the project’s settings and configuration, such as database connection information, time zone, and language code, as well as information about the applications installed in the project. dbproj/__init__.pyindicates that this directory is a Python package, thus enabling yo...