python3与mysql：创建表、插入数据54

 import pymysql
 db = pymysql.connect(host='localhost',user='root',passwd='',db='jodb1',port=3307,charset='utf8')
 # #测试连接开发库成功
 # db = pymysql.connect(host='172.31.20.2',user='root',passwd='sjroot',port=3306,charset='utf8')
 # print('heh')
 #数据中创建表
 cursor = db.cursor()
 cursor.execute('drop table if exists new_table2')
 print('Success!')
 
 sql = '''create table employee3 (
 first_name char(20) not null,
 last_name char(20),
 age int ,
 sex char(1),
 income float)
 '''
 # 这样修改语法有错误
 # sql = '''create table employee3 if not exists employee3(
 # first_name char(20) not null,
 # last_name char(20),
 # age int ,
 # sex char(1),
 # income float)
 # '''
 cursor.execute(sql)
 db.close()
 print('table create Successully!')
 
 sql = '''insert into employee
           (first_name,last_name,age,sex,income)
           values('Jiang','LiGai',20,'F',2000)'''
 try:
     cursor.execute(sql)
     db.commit()
 except:
     db.rollback()
     db.close()
 print('data insert successully')
 
 #数据没有插入成功，但是也没有出错
 # sql2 = 'insert into employee(first_name,last_name,age,sex,income)values({0},{1},{2},{3},{4})'.format('Jiang','PeiRong',21,'F',3000)
 # try:
 #     cursor.execute(sql2)
 #     db.commit()
 # except:
 #     db.rollback()
 # print('data insert successully2')