python mysql封装

python mysql封装

# coding:utf-8
# 08年写的
import  sys
try :
     import  MySQLdb
except  ImportError:
    sys.exit( " Exceptions.ImportError: No module named MySQLdb\n " );

class  pymysql(object):
    conn    =  None

     def   __init__ (self):
         pass

     def   __del__ (self):
        self.close()

     def  connect(self,db_host,db_user,db_password,db_name,db_port = 3306 ,db_charset = ' utf8 ' ):
         try :
            self.conn  =  MySQLdb.connect(host = db_host,user = db_user,passwd = db_password,db = db_name,port = db_port,charset = db_charset)

            self. __db_host   =  db_host
            self. __db_user   =  db_user
            self. __db_password   =  db_password
            self. __db_name   =  db_name
            self. __db_port   =  db_port
            self. __db_charset   =  db_charset
             return  True
         except :
             return  False


     def  reconnect(self):
         try :
            self.conn  =  MySQLdb.connect(host = self. __db_host ,user = self. __db_user ,passwd = self. __db_password ,db = self. __db_name ,port = self. __db_port ,charset = self. __db_charset )
             return  True
         except :
             return  False
     def  quote(self,queryString):
         return  MySQLdb.escape_string(queryString);

     def  query(self,sql):
         try :
            cursor  =  self.conn.cursor()
            cursor.execute(sql)
             return  cursor
         except :
            sys.exit( " MySQL Query Error:\n " + sql + " \n " )


     def  execute(self,sql):
         try :
             return  self.conn.cursor().execute(sql)
         except :
            sys.exit( " MySQL Query Error:\n " + sql + " \n " )

     def  fetch(self,cursor):
         return  cursor.fetchone()

     def  fetchRow(self,sql):
         return  self.query(sql).fetchone()

     def  fetchOne(self,sql):
         try :
             return  self.query(sql).fetchone()[0]
         except :
             return  None

     def  fetchAll(self,sql):
         return  self.query(sql).fetchall()

     def  insert(self,table,row):
        sqlArr  =  []
         for  key  in  row.iterkeys():
            sqlArr.append( " %s='%s' " % (key,row[key],))
        sql  =   " insert into  " + table  + "  set  " + str.join( " , " ,sqlArr)
         return  self.execute(sql)


     def  update(self,table,row,where):
        sqlArr  =  []
         for  key  in  row.iterkeys():
            sqlArr.append( " %s='%s' " % (key,row[key],))
        sql  =   " update  " + table  + "  set  " + str.join( " , " ,sqlArr) + "  where  " + where
         return  self.execute(sql)

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