python3连接mysql--增删改查

ps:MYSQLdb只适用于python2.x

python3不支持MYSQLdb,取而代之的是pymysql

运行会报：ImportError：No module named 'MYSQLdb'

import pymysql as pmq

#connect(ip.user,password,dbname)
con = pmq.connect('localhost','root','','python_test')
#操作游标
cur = con.cursor()

#建表
cur.execute("CREATE TABLE IF NOT EXISTS  Writers(Id INT PRIMARY KEY AUTO_INCREMENT,Name VARCHAR(25))")

#插入数据一
cur.execute("INSERT INTO Writers(Name) VALUES('Jack London')")
cur.execute("INSERT INTO Writers(Name) VALUES('Honore de Balzac')")
cur.execute("INSERT INTO writers VALUES(1,'Jack London')")
cur.execute("INSERT INTO writers VALUES(2,'Honore de Balzac')")

#提交到数据库 -------ps：不写这一行无法插入
con.commit()

#插入数据二
sql="INSERT INTO Writers(Name) VALUES('Jack London2')"
try:
#执行sql语句
cur.execute(sql)
#提交到数据库执行
con.commit()
except:
#如果发生错误则回滚
con.rollback()

 #查询
 cur.execute('select * from writers')

 results = cur.fetchall()

 for row in results:
     Id = row[0]
     Name = row[1]
     print("id=%s,name=%s" % (Id,Name))

 #更新
 Id= 1
 sql ="update writers set Name='updateJackto' where Id = {0}".format(Id)
 try:
     cur.execute(sql)
     con.commit()
 except:
     con.rollback()

 #删除
 Id=7
 sql = "delete from writers where Id = {0}".format(Id)
 try:
     cur.execute(sql)
     con.commit()
 except:
     con.rollback()