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python3.4用循环往mysql5.7中写数据并输出的实现方法

来源:中文源码网    浏览:170 次    日期:2024-03-27 21:46:52
【下载文档:  python3.4用循环往mysql5.7中写数据并输出的实现方法.txt 】


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
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中文源码网。

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