pymysql
pymsql是Python中操作MySQL的模块，其使用方法和MySQLdb几乎相同。
使用操作
1.执行SQL
#!/usr/bin/env python# -*- coding:utf-8 -*-import pymysql # 创建连接conn = pymysql.connect(host='127.0.0.1', port=3306, user='sunhao', passwd='123456', db='mydatabase')# 创建游标cursor = conn.cursor() # 执行SQL，并返回收影响行数effect_row = cursor.execute("update hosts set host = '1.1.1.2'") # 执行SQL，并返回受影响行数#effect_row = cursor.execute("update hosts set host = '1.1.1.2' where nid > %s", (1,)) # 执行SQL，并返回受影响行数# effect_row = cursor.executemany("insert into hosts(host,color_id)values(%s,%s)", [("1.1.1.11",1),("1.1.1.11",2)]) # effect_row = cursor.execute("insert into hosts(host,color_id)values(%s,%s)", ("1.1.1.11",1)) # 提交，不然无法保存新建或者修改的数据 conn.commit() # 关闭游标 cursor.close() # 关闭连接 conn.close() list=[
("1.1.1.11",1), ("1.1.1.12",2), ("1.1.1.13",3)] effect_row = cursor.executemany("insert into hosts(host,color_id)values(%s,%s)",list) 2、获取新创建数据自增ID
#!/usr/bin/env python# -*- coding:utf-8 -*-import pymysql conn = pymysql.connect(host='127.0.0.1', port=3306, user='root', passwd='123456', db='mydatabase')cursor = conn.cursor()cursor.executemany("insert into my_class(number,name)values(%s,%s)", [(1,'jim'),(2,'tom')])conn.commit()cursor.close()conn.close() # 获取最新自增IDnew_id = cursor.lastrowid 3、获取查询数据
#!/usr/bin/env python# -*- coding:utf-8 -*-import pymysql conn = pymysql.connect(host='127.0.0.1', port=3306, user='root', passwd='123456', db='mydatabase')cursor = conn.cursor()cursor.execute("select * from my_class") # 获取第一行数据row_1 = cursor.fetchone() # 获取前n行数据# row_2 = cursor.fetchmany(3)# 获取所有数据# row_3 = cursor.fetchall() conn.commit()cursor.close()conn.close() 4、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，即：
#!/usr/bin/env python# -*- coding:utf-8 -*-import pymysql conn = pymysql.connect(host='127.0.0.1', port=3306, user='root', passwd='123456', db='mydatabase') # 游标设置为字典类型cursor = conn.cursor(cursor=pymysql.cursors.DictCursor)r = cursor.execute("call p1()") result = cursor.fetchone() conn.commit()cursor.close()conn.close()
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 往下走一个指针 cursor.scroll(-1,mode='relative') -1是往上走
- cursor.scroll(2,mode='absolute') # 相对绝对位置移动 指针移动到第一个位置
5. SQL注入问题
import pymysqlconn = pymysql.connect(host='121.201.34.173',port=3306,user='sunhao',passwd='123456',db='mydatabase',charset='utf8')cur = conn.cursor()inp = input("请输入姓名:")# 字符串拼接形式 禁止使用这种操作sql = "insert into my_class(number,name) values(12,'%s')"sql = sql % (inp,)effect_row = cur.execute(sql)data = cur.fetchone()print(data)conn.commit()cur.close()conn.close() sql='select username,password from userinfo where username= "%s" and password = "%s"' #sql注入问题 sql语句注释用-- sql=sql%("alex or 1=1 -- ",123456) cursor.execute(sql)