使用with语句:为了确保资源得到正确释放,可以使用with语句来自动关闭Connection和Cursor对象。例如: with sqlite3.connect('test.db') as conn: with conn.cursor() as cursor: # 执行数据库操作 pass #在with语句块结束后,Connection和Cursor对象会自动关闭 参数化查询:为了防止
()]) create_sql = f'CREATE TABLE IF NOT EXISTS {table_name} ({column_defs})' with self._get_connection() as cursor: cursor.execute(create_sql) def create_index(self, table_name, index_name, columns, unique=False): """ 创建索引(带锁冲突重试) :param table_name: 表名 :param ...
(self, connection_name, query, params=None): with self.connections[connection_name].cursor() as cursor: #获取游标(cursor) cursor.execute(query,params) #执行查询语句 result = cursor.fetchall() #获取结果集合 return result def execute_query_all(self, query, params=None): #全部数据库执行查询(...
pool.put_connection(conn) returnrows 函数concurrent_access 可以在高频场景下调用,本质上,连接池相当于一个全局变量。 使用sqlalchemy创建连接池 使用sqlalchemy的create_engine函数,我们可以创建一个 SQLite 连接池。 fromsqlalchemyimportcreate_engine engine =...
2)同时,如果你可以使用另一种语法:with 来避免手动关闭cursors和connection连接 import pymssql server = "187.32.43.13" # 连接服务器地址 user = "root" # 连接帐号 password = "1234" # 连接密码 with pymssql.connect(server, user, password, "你的连接默认数据库名称") as conn: ...
with pymysql.connect(...) as conn: with conn.cursor() as cursor: cursor.execute("SELECT * FROM users") results = cursor.fetchall() for row in results: print(row) 运行 七、注意事项 SQL注入:使用参数化查询来防止SQL注入。异常处理:在执行数据库操作时,使用try-except块来捕获和处理异常。资源...
如果你要处理的是SQLite数据库,可以使用Python内置的sqlite3模块来连接数据库并运行SQL脚本文件。下面是一个示例代码: importsqlite3# 创建数据库连接connection=sqlite3.connect('database.db')# 创建游标对象cursor=connection.cursor()# 读取SQL脚本文件withopen('script.sql','r')asfile:sql_script=file.read()...
3. 连接SQL Server数据库 import pymssql # 建立数据库连接 connection = pymssql.connect( host='your_sql_server_host', user='your_username', password='your_password', database='your_database' ) # 创建游标对象 cursor = connection.cursor() ...
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最近给一个学妹看一个 Python 使用 pymssql 连接 SQL Server 报错问题,具体报错信息如下: Error: (20002, b'DB-Lib error message 20002, severity 9:\nAdaptive Server connection failed (127.0.0.1)\nDB-Lib error message 20002, severity 9:\nAdaptive Server connection failed (127.0.0.1)\n') ...