概述
Python 操作 MysqL
配置
pip安装pyMysqL模块
直接使用pip安装 pip install pyMysqL
win64上直接在cmd中执行
连接本地数据库
#!/usr/bin/python # coding=utf-8 import pyMysqL # 连接本地数据库 conn = pyMysqL.connect(host='localhost',port=3306,user='root',passwd='a123',db='samp_db1',charset='utf8') cursor = conn.cursor() cursor.execute('select * from bigstu') for row in cursor.fetchall(): print(row) # 查 cursor.execute('select id,name from bigstu where age > 22') for res in cursor.fetchall(): print(str(res[0]) + "," + res[1]) cursor.close() print('-- end --')
输出:
(1,'张三','男',24,datetime.date(2017,3,29),'13666665555') (6,'小刚',23,11),'778899888') (8,'小霞','女',20,13),'13712345678') (12,'小智',21,7),'13787654321') 1,张三 6,小刚 -- end --
增
插入数据
插入一条数据,接上面的代码
insertsql = "insert into bigstu (name,sex,age,mobile) values ('%s','%s',%d,'%s') " xiuji = ('秀吉',15,'13400001111') cursor.execute(insertsql % xiuji) conn.commit() # 别忘了提交
添加列
在mobile后面添加一列cash
addCo = "alter table bigstu add cash int after mobile" cursor.execute(addCo)
如果要设置默认值
addCo = "alter table bigstu add cash int default 0 after mobile" cursor.execute(addCo)
删
删除数据
删除 name=秀吉 的数据
deletesql = "delete from bigstu where name = '%s'" cursor.execute(deletesql % '秀吉')
删除列
删除cash列
dropCo = "alter table bigstu drop cash" cursor.execute(dropCo)
改
修改数据
更新符合条件的数据
updatesql = "update bigstu set sex = '%s' where name = '%s'" updateXiuji = ('秀吉','秀吉') # 秀吉的性别是秀吉 cursor.execute(updatesql % updateXiuji) conn.commit()
事物处理
给某个记录的cash增加
table = "bigstu" addCash = "update " + table + " set cash = cash + '%d' where name = '%s'" lucky = (1000,"秀吉") try: cursor.execute(addCash % lucky) except Exception as e: conn.rollback() print("加钱失败了") else: conn.commit()
直接执行sql语句,十分方便
代码片段
整理得出需要插入的列名,然后将列插入到相应的表中
import pyMysqL import json import os import secureUtils mapping_keys = json.load(open("key_mapping_db.json","r")) db_keys = [] # json中所有的key for k in mapping_keys.values(): db_keys.append(k) conn = pyMysqL.connect(host='localhost',passwd='*****',db='db_name',charset='utf8') cursor = conn.cursor() table_main = "table_main" main_table_keys = [] # 主表的列名 cursor.execute("show columns from " + table_main) for row in cursor.fetchall(): main_table_keys.append(row[0]) staff_table_keys = [] cursor.execute("show columns from table_second") for row in cursor.fetchall(): staff_table_keys.append(row[0]) need_to_insert_keys = [] for k in db_keys: if k not in staff_table_keys and k not in main_table_keys and k not in need_to_insert_keys: need_to_insert_keys.append(k) print("need to insert " + str(len(need_to_insert_keys))) print(need_to_insert_keys) for kn in need_to_insert_keys: print("add key to db " + kn) cursor.execute("alter table staff_table add " + kn +" text") conn.close()
将字段字符改变
这里将main_table_keys中的所有字段改为utf8
# change column character set to utf8 for co in main_table_keys: change_sql = "alter table " + table_main + " modify " + co + " text character set utf8" print(change_sql) cursor.execute(change_sql)
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持编程小技巧。
总结
以上是编程之家为你收集整理的Python操作使用MySQL数据库的实例代码全部内容,希望文章能够帮你解决Python操作使用MySQL数据库的实例代码所遇到的程序开发问题。
如果您也喜欢它,动动您的小指点个赞吧