mysql 5.7 循环语句_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萬仟网。

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