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# -*- coding: UTF-8 -*-"""desc:数据库操作类@note:1、执行带参数的SQL时,请先用sql语句指定需要输入的条件列表,然后再用tuple/list进行条件批配2、在格式SQL中不需要使用引号指定数据类型,系统会根据输入参数自动识别3、在输入的值中不需要使用转意函数,系统会自动处理"""import MySQLdbfrom MySQLdb.cursors import DictCursorfrom DBUtils.PooledDB import PooledDBimport Config"""Config是一些数据库的配置文件"""class Mysql(object):    """        MYSQL数据库对象,负责产生数据库连接 , 此类中的连接采用连接池实现        获取连接对象:conn = Mysql.getConn()        释放连接对象;conn.close()或del conn    """    #连接池对象    __pool = None    def __init__(self):        """        数据库构造函数,从连接池中取出连接,并生成操作游标        """#        self._conn = MySQLdb.connect(host=Config.DBHOST , port=Config.DBPORT , user=Config.DBUSER , passwd=Config.DBPWD ,#                              db=Config.DBNAME,use_unicode=False,charset=Config.DBCHAR,cursorclass=DictCursor)        self._conn = Mysql.__getConn()        self._cursor = self._conn.cursor()    @staticmethod    def __getConn():        """        @summary: 静态方法,从连接池中取出连接        @return MySQLdb.connection        """        if Mysql.__pool is None:            __pool = PooledDB(creator=MySQLdb, mincached=1 , maxcached=20 ,                              host=Config.DBHOST , port=Config.DBPORT , user=Config.DBUSER , passwd=Config.DBPWD ,                              db=Config.DBNAME,use_unicode=False,charset=Config.DBCHAR,cursorclass=DictCursor)        return __pool.connection()    def getAll(self,sql,param=None):        """        @summary: 执行查询,并取出所有结果集        @param sql:查询SQL,如果有查询条件,请只指定条件列表,并将条件值使用参数[param]传递进来        @param param: 可选参数,条件列表值(元组/列表)        @return: result list/boolean 查询到的结果集        """        if param is None:            count = self._cursor.execute(sql)        else:            count = self._cursor.execute(sql,param)        if count>0:            result = self._cursor.fetchall()        else:            result = False        return result    def getOne(self,sql,param=None):        """        @summary: 执行查询,并取出第一条        @param sql:查询SQL,如果有查询条件,请只指定条件列表,并将条件值使用参数[param]传递进来        @param param: 可选参数,条件列表值(元组/列表)        @return: result list/boolean 查询到的结果集        """        if param is None:            count = self._cursor.execute(sql)        else:            count = self._cursor.execute(sql,param)        if count>0:            result = self._cursor.fetchone()        else:            result = False        return result    def getMany(self,sql,num,param=None):        """        @summary: 执行查询,并取出num条结果        @param sql:查询SQL,如果有查询条件,请只指定条件列表,并将条件值使用参数[param]传递进来        @param num:取得的结果条数        @param param: 可选参数,条件列表值(元组/列表)        @return: result list/boolean 查询到的结果集        """        if param is None:            count = self._cursor.execute(sql)        else:            count = self._cursor.execute(sql,param)        if count>0:            result = self._cursor.fetchmany(num)        else:            result = False        return result    def insertOne(self,sql,value):        """        @summary: 向数据表插入一条记录        @param sql:要插入的SQL格式        @param value:要插入的记录数据tuple/list        @return: insertId 受影响的行数        """        self._cursor.execute(sql,value)        return self.__getInsertId()    def insertMany(self,sql,values):        """        @summary: 向数据表插入多条记录        @param sql:要插入的SQL格式        @param values:要插入的记录数据tuple(tuple)/list[list]        @return: count 受影响的行数        """        count = self._cursor.executemany(sql,values)        return count    def __getInsertId(self):        """        获取当前连接最后一次插入操作生成的id,如果没有则为0        """        self._cursor.execute("SELECT @@IDENTITY AS id")        result = self._cursor.fetchall()        return result[0]['id']    def __query(self,sql,param=None):        if param is None:            count = self._cursor.execute(sql)        else:            count = self._cursor.execute(sql,param)        return count    def update(self,sql,param=None):        """        @summary: 更新数据表记录        @param sql: SQL格式及条件,使用(%s,%s)        @param param: 要更新的  值 tuple/list        @return: count 受影响的行数        """        return self.__query(sql,param)    def delete(self,sql,param=None):        """        @summary: 删除数据表记录        @param sql: SQL格式及条件,使用(%s,%s)        @param param: 要删除的条件 值 tuple/list        @return: count 受影响的行数        """        return self.__query(sql,param)    def begin(self):        """        @summary: 开启事务        """        self._conn.autocommit(0)    def end(self,option='commit'):        """        @summary: 结束事务        """        if option=='commit':            self._conn.commit()        else:            self._conn.rollback()    def dispose(self,isEnd=1):        """        @summary: 释放连接池资源        """        if isEnd==1:            self.end('commit')        else:            self.end('rollback');        self._cursor.close()        self._conn.close()

 

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