python3.4用循环往mysql5.7中写数据并输出的实现方法

如下所示：

#!/usr/bin/env python
# -*- coding:utf-8 -*-
# __author__ = "blzhu"
"""
python study
Date：2017
"""
import pymysql
# import MySQLdb #python2中的产物

try:
 # 获取一个数据库连接，注意如果是UTF-8类型的，需要制定数据库
 conn = pymysql.connect(host='localhost', user='root', passwd='root', db='zbltest1', port=3306, charset='utf8')
 cur = conn.cursor() # 获取一个游标
 for i in range(1, 10):
 zbl_id = str(i)
 zbl_name = 'zbl'+str(i)
 zbl_gender = 'man'
 # print("%s,%s,%s" % (zbl_id,zbl_name,zbl_gender))
 # sql = "insert student VALUES (id='%s',name='%s',gender='%s')" % (zbl_id,zbl_name,zbl_gender)
 sql = "insert student VALUES ('%s','%s','%s')" % (zbl_id, zbl_name, zbl_gender)
 # print(sql)
 cur.execute(sql)
 conn.commit()# 将数据写入数据库

 # try:
 # cur.execute(sql)
 # cur.commit()
 # except:
 # cur.rollback()
 #cur.execute("""INSERT INTO 'student' ('id','name','gender') VALUES (%s,%s,%s ,(zbl_id,zbl_name,zbl_gender,))""")
 #cur.execute("""INSERT INTO 'student' ('id','name','gender') VALUES (zbl_id,zbl_name,zbl_gender)""")

 # cur.execute("INSERT student VALUES (zbl_id,zbl_name,zbl_gender)")

 # cur.execute("INSERT student VALUES ('4', 'zbl4', 'man')")# 正确
 #cur.execute("INSERT INTO 'student' ('id','name','gender') VALUES ('4', 'zbl4', 'man')")#错误
 #cur.execute("INSERT student ('id','name','gender') VALUES ('4', 'zbl4', 'man')")


 cur.execute('select * from student')
 # data=cur.fetchall()
 for d in cur:
 # 注意int类型需要使用str函数转义
 print("ID: " + str(d[0]) + ' 名字： ' + d[1] + " 性别： " + d[2])
 print("row_number:", (cur.rownumber))
 # print('hello')

 cur.close() # 关闭游标
 conn.close() # 释放数据库资源
except Exception:
 print("发生异常")

上面代码是对的，但是是曲折的。

下面整理一下：

#!/usr/bin/env python
# -*- coding:utf-8 -*-
# __author__ = "blzhu"
"""
python study
Date：2017
"""
import pymysql
try:
 # 获取一个数据库连接，注意如果是UTF-8类型的，需要制定数据库
 conn = pymysql.connect(host='localhost', user='root', passwd='root', db='zbltest1', port=3306, charset='utf8')
 cur = conn.cursor() # 获取一个游标
 for i in range(1, 10):
 zbl_id = str(i)
 zbl_name = 'zbl'+str(i)
 zbl_gender = 'man'
 # print("%s,%s,%s" % (zbl_id,zbl_name,zbl_gender))
 # sql = "insert student VALUES (id='%s',name='%s',gender='%s')" % (zbl_id,zbl_name,zbl_gender)
 sql = "insert student VALUES ('%s','%s','%s')" % (zbl_id, zbl_name, zbl_gender)
 # print(sql)
 cur.execute(sql)
 conn.commit()# 将数据写入数据库
 cur.execute('select * from student')
 # data=cur.fetchall()
 for d in cur:
 # 注意int类型需要使用str函数转义
 print("ID: " + str(d[0]) + ' 名字： ' + d[1] + " 性别： " + d[2])
 print("row_number:", (cur.rownumber))
 # print('hello')

 cur.close() # 关闭游标
 conn.close() # 释放数据库资源
except Exception:
 print("发生异常")

#!/usr/bin/python3
import pymysql
import types

db=pymysql.connect("localhost","root","123456","python");

cursor=db.cursor()

#创建user表
cursor.execute("drop table if exists user")
sql="""CREATE TABLE IF NOT EXISTS `user` (
 `id` int(11) NOT NULL AUTO_INCREMENT,
 `name` varchar(255) NOT NULL,
 `age` int(11) NOT NULL,
 PRIMARY KEY (`id`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=0"""

cursor.execute(sql)


#user插入数据
sql="""INSERT INTO `user` (`name`, `age`) VALUES
('test1', 1),
('test2', 2),
('test3', 3),
('test4', 4),
('test5', 5),
('test6', 6);"""

try:
 # 执行sql语句
 cursor.execute(sql)
 # 提交到数据库执行
 db.commit()
except:
 # 如果发生错误则回滚
 db.rollback()
 
 
#更新
id=1
sql="update user set age=100 where id='%s'" % (id)
try:
 cursor.execute(sql)
 db.commit()
except:
 db.rollback()
 
#删除
id=2
sql="delete from user where id='%s'" % (id)
try:
 cursor.execute(sql)
 db.commit()
except:
 db.rollback()
 
 
#查询
cursor.execute("select * from user")

results=cursor.fetchall()

for row in results:
 name=row[0]
 age=row[1]
 #print(type(row[1])) #打印变量类型 <class 'str'>

 print ("name=%s,age=%s" % \
 (age, name))

以上这篇python3.4用循环往mysql5.7中写数据并输出的实现方法就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持脚本之家。