10 class封装 ORM

1.版本1：初始化

# -*- coding:utf-8 -*-
from MySQLdb import *

class MysqlHelper:
    def __init__(self,host,port,user,passwd,db,charset='utf8'):
        self.host=host
        self.port=port
        self.user=user
        self.passwd=passwd
        self.db=db
        self.charset=charset

mysql1 = MysqlHelper("localhost",3306,"root","mysql","py31""utf8")

2.版本2：打开关闭方法

# -*- coding:utf-8 -*-
from MySQLdb import *

class MysqlHelper:
    """封装"""
    def __init__(self,host,port,user,passwd,db,charset='utf8'):
        """初始化"""
        self.host=host
        self.port=port
        self.user=user
        self.passwd=passwd
        self.db=db
        self.charset=charset

    def open(self):
        """连接数据库"""
        self.conn = connect(host=self.host, port=self.port, user=self.user, passwd=self.passwd, db=self.db, charset=self.charset)
        self.cursor1 = self.conn.cursor()

    def close(self):
        """关闭连接"""
        self.cursor1.close()
        self.conn.close()

mysql1 = MysqlHelper("localhost",3306,"root","mysql","py31""utf8")

3.版本3：增加修改删除

# -*- coding:utf-8 -*-
from MySQLdb import *

class MysqlHelper:
    """封装"""
    def __init__(self,host,port,user,passwd,db,charset='utf8'):
        """初始化"""
        self.host=host
        self.port=port
        self.user=user
        self.passwd=passwd
        self.db=db
        self.charset=charset

    def open(self):
        """连接数据库"""
        self.conn = connect(host=self.host, port=self.port, user=self.user, passwd=self.passwd, db=self.db, charset=self.charset)
        self.cursor1 = self.conn.cursor()

    def close(self):
        """关闭连接"""
        self.cursor1.close()
        self.conn.close()

    def iud(self,sql_content):
        """增删改"""
        self.open()   #调用open方法

        self.sql = '%s'[sql_content]
        self.cursor1.execute(self.sql)
        self.conn.commit()

        self.close()   #调用close方法

mysql1 = MysqlHelper("localhost",3306,"root","mysql","py31""utf8")

sql_content = raw_input('请输入sql语句:')
mysql1.iud(sql_content)

　　　　　　

4.版本4：抛出异常，参数化

# -*- coding:utf-8 -*-
from MySQLdb import *

class MysqlHelper:
    """封装"""
    def __init__(self,host,port,user,passwd,db,charset='utf8'):
        """初始化"""
        self.host=host
        self.port=port
        self.user=user
        self.passwd=passwd
        self.db=db
        self.charset=charset

    def open(self):
        """连接数据库"""
        self.conn = connect(host=self.host, port=self.port, user=self.user, passwd=self.passwd, db=self.db, charset=self.charset)
        self.cursor1 = self.conn.cursor()

    def close(self):
        """关闭连接"""
        self.cursor1.close()
        self.conn.close()

    def iud(self,sql,params):
        """增删改"""
        try:
            self.open()   #调用open方法

            self.cursor1.execute(sql,params)
            self.conn.commit()

            self.close()   #调用close方法
            print('ok')
        except Exception as e:
            print(e.message)

mysql1 = MysqlHelper("localhost",3306,"root","mysql","py31","utf8")

name = "jack"
id = 1
sql = 'update students set name=%s where id=%s'
params=[name,id]
mysql1.iud(sql,params)

/usr/bin/python2.7 /home/python/code/03-class封装.py
ok

+----+------------+--------+---------------------+----------+
|  1 | jack       |       | 1999-09-09 00:00:00 |          |

5.版本5：查询

# -*- coding:utf-8 -*-
from MySQLdb import *

class MysqlHelper:
    """封装"""
    def __init__(self,host,port,user,passwd,db,charset='utf8'):
        """初始化"""
        self.host=host
        self.port=port
        self.user=user
        self.passwd=passwd
        self.db=db
        self.charset=charset

    def open(self):
        """连接数据库"""
        self.conn = connect(host=self.host, port=self.port, user=self.user, passwd=self.passwd, db=self.db, charset=self.charset)
        self.cursor1 = self.conn.cursor()

    def close(self):
        """关闭连接"""
        self.cursor1.close()
        self.conn.close()

    def iud(self,sql,params):
        """增删改"""
        try:
            self.open()   #调用open方法

            self.cursor1.execute(sql,params)
            self.conn.commit()

            self.close()   #调用close方法
            print('ok')
        except Exception as e:
            print(e.message)

    def all(self,sql,params=()):       #默认参数
        try:
            self.open()
            print ""
            self.cursor1.execute(sql,params)
            result = self.cursor1.fetchall()    #fetchall()获取多条数据
            print ""                                     #fetchone()获取1条数据
            print(result)
            self.close()

            return result                             #返回result

        except Exception as e:
            print(e.message)

mysql1 = MysqlHelper("localhost",3306,"root","mysql","py31","utf8")

sql = 'select * from students where id<5'
result = mysql1.all(sql)
print(result)

1
2
((1L, u'jack', '\x01', datetime.datetime(1999, 9, 9, 0, 0), '\x00'), (2L, u'\u817e\u65ed', '\x01', datetime.datetime(1990, 2, 2, 0, 0), '\x00'), (3L, u'\u7f51\u6613', '\x01', None, '\x00'), (4L, u'\u5c0f\u7c73', '\x01', None, '\x00'))
((1L, u'jack', '\x01', datetime.datetime(1999, 9, 9, 0, 0), '\x00'), (2L, u'\u817e\u65ed', '\x01', datetime.datetime(1990, 2, 2, 0, 0), '\x00'), (3L, u'\u7f51\u6613', '\x01', None, '\x00'), (4L, u'\u5c0f\u7c73', '\x01', None, '\x00'))

6.版本6：获取单条数据

# -*- coding:utf-8 -*-
from MySQLdb import *

class MysqlHelper:
    """封装"""
    def __init__(self,host,port,user,passwd,db,charset='utf8'):
        """初始化"""
        self.host=host
        self.port=port
        self.user=user
        self.passwd=passwd
        self.db=db
        self.charset=charset

    def open(self):
        """连接数据库"""
        self.conn = connect(host=self.host, port=self.port, user=self.user, passwd=self.passwd, db=self.db, charset=self.charset)
        self.cursor1 = self.conn.cursor()

    def close(self):
        """关闭连接"""
        self.cursor1.close()
        self.conn.close()

    def iud(self,sql,params):
        """增删改"""
        try:
            self.open()   #调用open方法

            self.cursor1.execute(sql,params)
            self.conn.commit()

            self.close()   #调用close方法
            print('ok')
        except Exception as e:
            print(e.message)

    def all(self,sql,params=()):
        """获取多条数据"""
        try:
            self.open()

            self.cursor1.execute(sql,params)
            result = self.cursor1.fetchall()
            print(result)

            self.close()

            return result

        except Exception as e:
            print(e.message)

    def one(self,sql,params=()):
        """获取单挑数据"""
        try:
            self.open()

            self.cursor1.execute(sql,params)
            result = self.cursor1.fetchone()
            print(result)

            self.close()

            return result

        except Exception as e:
            print(e.message)

7.版本7：封装完成

#encoding=utf8
import MySQLdb

class MysqlHelper():
    def __init__(self,host,port,db,user,passwd,charset='utf8'):
        self.host=host
        self.port=port
        self.db=db
        self.user=user
        self.passwd=passwd
        self.charset=charset

    def connect(self):
        self.conn=MySQLdb.connect(host=self.host,port=self.port,db=self.db,user=self.user,passwd=self.passwd,charset=self.charset)
        self.cursor=self.conn.cursor()

    def close(self):
        self.cursor.close()
        self.conn.close()

    def get_one(self,sql,params=()):
        result=None
        try:
            self.connect()
            self.cursor.execute(sql, params)
            result = self.cursor.fetchone()
            self.close()
        except Exception, e:
            print e.message
        return result

    def get_all(self,sql,params=()):
        list=()
        try:
            self.connect()
            self.cursor.execute(sql,params)
            list=self.cursor.fetchall()
            self.close()
        except Exception,e:
            print e.message
        return list

    def insert(self,sql,params=()):
        return self.__edit(sql,params)

    def update(self, sql, params=()):
        return self.__edit(sql, params)

    def delete(self, sql, params=()):
        return self.__edit(sql, params)

    def __edit(self,sql,params):
        count=0
        try:
            self.connect()
            count=self.cursor.execute(sql,params)
            self.conn.commit()
            self.close()
        except Exception,e:
            print e.message
        return count

8 当做第三方模块导入