Python 对mysql数据库的操作
#!/usr/bin/python
# -*- coding: utf-8 -*-
import Mysqldb
class mysql:
def __init__(self, sql, host='127.0.0.1', username='root', passWord='root', dbname='dbname'):
self.username = username
self.password = password
self.dbname = dbname
self.sql = sql
self.mysqldb = MySQLdb.connect(host, self.username, self.password, self.dbname, charset="utf8")
# 查询操作
def query(self):
try:
cursor = self.mysqldb.cursor()
cursor.execute(self.sql)
data = cursor.fetchall()
return data
except Exception as e:
print e
# 插入操作
def insert(self):
try:
cursor = self.mysqldb.cursor()
cursor.execute(self.sql)
self.mysqldb.commit()
self.mysqldb.close()
return 'ok'
except Exception as e:
print e
# 删除操作
def delete(self):
try:
cursor = self.mysqldb.cursor()
cursor.execute(self.sql)
self.mysqldb.commit()
self.mysqldb.close()
except Exception as e:
print e
# 修改操作
def update(self):
try:
cursor = self.mysqldb.cursor()
cursor.execute(self.sql)
self.mysqldb.commit()
self.mysqldb.close()
except Exception as e:
print e
if __name__=="__main__":
pass
#!/usr/bin/Python
# -*- coding: utf-8 -*-
__author__ = 'gaogd'
import MySQLdb
try:
conn = MySQLdb.connect(host='localhost', user='root', passwd='root', port=3306)
cur = conn.cursor()
cur.execute('create database if not exists python')
conn.select_db('python')
cur.execute('create table test(id int,info varchar(20))')
value = [1, 'hi rollen']
cur.execute('insert into test values(%s,%s)', value)
values = []
for i in range(20):
values.append((i, 'hi rollen' + str(i)))
cur.executemany('insert into test values(%s,%s)', values)
## 重点：这个 cur.executemany 可以一次性插入多个值
cur.execute('update test set info="I am rollen" where id=3')
conn.commit()
cur.close()
conn.close()
except MySQLdb.Error, e:
print "Mysql Error %d: %s" % (e.args[0], e.args[1])
常用函数：
然后,这个连接对象也提供了对事务操作的支持,标准的方法
commit()提交
rollback()回滚
cursor用来执行命令的方法:
callproc(self,procname,args):用来执行存储过程,接收的参数为存储过程名和参数列表,返回值为受影响的行数
execute(self,
query, args):执行单条sql语句,接收的参数为sql语句本身和使用的参数列表,返回值为受影响的行数
executemany(self,
query, args):执行单挑sql语句,但是重复执行参数列表里的参数,返回值为受影响的行数
nextset(self):移动到下一个结果集
cursor用来接收返回值的方法:
fetchall(self):接收全部的返回结果行.
fetchmany(self,
size=None):接收size条返回结果行.如果size的值大于返回的结果行的数量,则会返回cursor.arraysize条数据.
fetchone(self):返回一条结果行.
scroll(self,
value, mode='relative'):移动指针到某一行.如果mode='relative',则表示从当前所在行移动value条,如果 mode='absolute',则表示从结果集的第一行移动value条.
