1. python操作数据库pymysql
PyMSQL是一个纯的python的MySQL客户端。
pip install PyMySQL使用步骤
- 创建连接(修高速公路)
- 创建游标(运输车)
- 执行sql(提货单)
- 获取结果(卸货)
- 关闭游标(车退掉)
- 关闭连接(路也断掉)
import pymysqlfrom pymysql.cursors import DictCursor# 1.创建连接(修高速公路)conn = pymysql.connect( host='127.0.0.1', user='admin', password='12345', port=3306, db='mysql', charset='utf8')# 2. 创建游标(运输车)# cursor = conn.cursor() # 返回元组cursor = conn.cursor(DictCursor) # 返回字典# 3. 执行sql(提货单)sql ="select count(1) total, (case when t1.status = 1 then '待整改' when t1.status = 2 then '待复查' when t1.status = 3 then '整改完成' else '未知类型' end) orderStatus from ibs_ai_iot.ai_rectification_main t1 left join ibs_ai_iot.work_order t3 on t1.id = t3.rectification_id where t1.project_id = 103672 and t1.delete_flag = 0 and t3.is_delete = 0 group by t1.status order by orderStatus desc;",res = cursor.execute(sql)print(res)# 4. 获取结果(卸货)res1 = cursor.fetchone() # 一次卸载一条res2 = cursor.fetchmany(3) # 一次卸载指定的条数res3 = cursor.fetchall() # 一次获取所有# 5. 关闭游标(车退掉)cursor.close()# 6. 关闭连接(路也断掉)conn.close()[{'total': 30, 'orderStatus': '整改完成'}, {'total': 5, 'orderStatus': '待整改'}]更新数据
import pymysqldb_config = { 'host': '127.0.0.1', 'user': 'admin', 'password': '123456', 'port': 3306, 'db': 'mysql', 'charset': 'utf8'}conn = pymysql.connect(**db_config)try: with conn.cursor() as cursor: # 上下文管理--自动关闭游标 sql1 = 'UPDATE table t1 set t1.user_name="勇哥" where t1.username="h1" ' sql2 = 'UPDATE table t1 set t1.user_name="勇哥2" where t1.username="h2" ' cursor.execute(sql1) cursor.execute(sql2) # pymysql默认开启事务 conn.commit()except Exception as e: # 回滚 conn.rollback()finally: conn.close()本文来自博客园，作者：奈非天，转载请注明原文链接：https://www.cnblogs.com/Nephalem-262667641/p/17310424.html