数据库-python操作mysql(pymsql)
pymsql是Python中操作MySQL的模块,其使用方法和MySQLdb几乎相同
一:安装pymysql
pip3 install pymysql
二:使用pytmysql
# -*- coding:utf-8 -*- __author__ = 'shisanjun' import pymysql #创建连接 conn=pymysql.connect(host="192.168.0.121",port=3306,user="admin",password="admin",db="test2") #创建游标 cursor=conn.cursor() #执行sql,并还回影响的行数 effct_row=cursor.execute("update student set name='shi' where name='shisanjun'") print(effct_row) #执行sql,并返回影响行数,多条记录执行 effct_row=cursor.executemany("insert into student (name,age,sex) value (%s, %s, %s)",[("tianshi",23,"F"),("xiatian",24,"F")]) conn.commit() #获取最新自增ID print(cursor.lastrowid) cursor.execute("select * from student") # 获取第一行数据 print(cursor.fetchone()) #获取前n行数据 print(cursor.fetchmany(3)) # 获取所有数据 print(cursor.fetchall()) conn.commit() cursor.close() conn.close()
4 9 (1, 'shi', 23, 'M') ((2, 'shisanjun2', 23, 'M'), (4, 'shisanjun3', 24, 'F'), (5, 'shisanjun3', 25, 'F')) ((6, 'shi', 25, 'F'), (7, 'shi', 26, 'F'), (8, 'shi', 26, 'F'), (9, 'tianshi', 23, 'F'), (10, 'xiatian', 24, 'F'))
注:在fetch数据时按照顺序进行,可以使用cursor.scroll(num,mode)来移动游标位置,如:
- cursor.scroll(1,mode='relative') # 相对当前位置移动
- cursor.scroll(2,mode='absolute') # 相对绝对位置移动
三:fetch数据类型
关于默认获取的数据是元祖类型,如果想要或者字典类型的数据
# -*- coding:utf-8 -*- __author__ = 'shisanjun' import pymysql #创建连接 conn=pymysql.connect(host="192.168.0.121",port=3306,user="admin",password="admin",db="test2") #创建游标 cursor=conn.cursor(cursor=pymysql.cursors.DictCursor) r=cursor.execute("select * from student") result=cursor.fetchall() print(r) print(result) conn.commit() cursor.close() conn.close() 9 [{'stu_id': 1, 'name': 'shi', 'age': 23, 'sex': 'M'}, {'stu_id': 2, 'name': 'shisanjun2', 'age': 23, 'sex': 'M'}, {'stu_id': 4, 'name': 'shisanjun3', 'age': 24, 'sex': 'F'}, {'stu_id': 5, 'name': 'shisanjun3', 'age': 25, 'sex': 'F'}, {'stu_id': 6, 'name': 'shi', 'age': 25, 'sex': 'F'}, {'stu_id': 7, 'name': 'shi', 'age': 26, 'sex': 'F'}, {'stu_id': 8, 'name': 'shi', 'age': 26, 'sex': 'F'}, {'stu_id': 9, 'name': 'tianshi', 'age': 23, 'sex': 'F'}, {'stu_id': 10, 'name': 'xiatian', 'age': 24, 'sex': 'F'}]