() as cursor: # SQL查询语句 sql = "SELECT * FROM users WHERE id IN (%s)" # 要查询的ID列表 id_list = [1, 2, 3] #将ID列表转换为元组,以适应SQL查询 ids_tuple = tuple(id_list) # 执行SQL查询 cursor.execute(sql, ids_tuple) # 获取所有查询结果 results = cursor.fetchall() # 将...
() #执行结果转化为dataframe df = pd.DataFrame(list(result)) # 关闭连接 db.close() #返回dataframe return result,col sql1 = """select comment_sql from etl_event_head where event_id=6001""" resu,co = execude_sql(sql1) for (test,) in resu: result,col = execude_sql(test) print(...
If args is a list or tuple, %s can be used as a placeholder in the query. If args is a dict, %(name)s can be used as a placeholder in the query. """ def executemany(self, query, args): # type: (str, list) -> int """Run several data against one query :param query: que...
MySQL-python:也就是MySQLdb,底层是通过C操作MySQL,效率高,但是只支持py2,不支持py3。 mysqlclient:是MySQL-python的一个分支。它增加了Python 3支持,并修复了许多错误。Django文档推荐的MySQL依赖库。 PyMySQL:纯Python实现的模块,可以与Python代码兼容衔接,并也几乎兼容MySQL-python。 MySQL Connector/Python:MySQL官...
WHERE 子句 if args: conditions = " AND ".join(f"{key} = %s" for key in args[0].keys()) sql += f" WHERE {conditions}" cursor.execute(sql, list(args[0].values())) # 如果有关键字参数,添加 WHERE 子句 elif kwargs: conditions = " AND ".join(f"{key} = %s" for key in ...
sql="SELECT * FROM EMPLOYEE WHERE INCOME > %s"%(1000)try:# 执行SQL语句 cursor.execute(sql)# 获取所有记录列表 result1=cursor.fetchone()result2=cursor.fetchmany(2)results=cursor.fetchall()print(result1)print(result2)print(results)except:print("Error: unable to fetch data")# 关闭数据库连接...
第八步: distinct 第九步: order by <order_by_condition> 第十步: limit <limit_number> 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 子查询: 1. 带 in 关键字的查询: # 查询平均年龄在25岁以上的部门名 select name from department where id in (select dep_id...
# 4. 执行sql语句sql="select * from students where name = '%s'; "%"张三' or 1 = 1 or '"cursor.execute(sql)print(sql)# 获取查询结果result=cursor.fetchall()forrowinresult:print(row) # 5. 关闭游标cursor.close() # 6. 关闭连接conn.close() ...
use mysql;updateusersetauthentication_string=password('i_LOVE_macos_123')whereuser='root';flushprivileges; 1. 2. 3. 将MySQL配置文件中的skip-grant-tables去掉,然后重启服务器,重新登录。这一次需要提供用户名和口令才能连接MySQL服务器。 复制
cursor.execute(sql, data)# 指定sql语句# 提交事务才可以生效conn.commit()# (2)方案2 : 一次性批量插入数据name_list = [iforiin"Ptrjkl"] password_list = [str(i)foriinrange(6)] data_all =list(zip(name_list, password_list))# [('c', '0'), ('h', '1'), ('o', '2'), ('...