import sqlite3

'''寫一個(gè)類打包成庫，通用于儲(chǔ)存信息的sqlite'''
'''函數(shù)返回值可優(yōu)化'''
'''使用：使用'''
'''說明：1、單例模式連接數(shù)據(jù)庫：避免數(shù)據(jù)庫connect過多導(dǎo)致數(shù)據(jù)庫down
        2、根據(jù)數(shù)據(jù)庫增刪查改性能對(duì)比，統(tǒng)一使用execute進(jìn)行常規(guī)數(shù)據(jù)庫操作
        3、且不做try操作：1、影響性能 2、若報(bào)錯(cuò)，外部調(diào)用無法確定問題所在，'''

class LiteDb(object):
    _instance = None

    def __new__(cls, *args, **kw):
        if cls._instance is None:
            cls._instance = object.__new__(cls)
        return cls._instance

    def openDb(self, dbname):
        self.dbname = dbname
        self.conn = sqlite3.connect(self.dbname)
        self.cursor = self.conn.cursor()

    def closeDb(self):
        '''
        關(guān)閉數(shù)據(jù)庫
        :return:
        '''
        self.cursor.close()
        self.conn.close()

    def createTables(self, sql):
        '''
        example：'create table userinfo(name text, email text)'
        :return: result=[1,None]  
        '''
        self.cursor.execute(sql)
        self.conn.commit()
        result = [1, None]
        return result

    def dropTables(self, sql):
        '''
        example:'drop table userinfo'
        :param sql:
        :return:result=[1,None]
        '''
        self.cursor.execute(sql)
        self.conn.commit()
        result = [1, None]
        return result

    def executeSql(self, sql, value=None):
        '''
        執(zhí)行單個(gè)sql語句，只需要傳入sql語句和值便可
        :param sql:'insert into user(name,password,number,status) values(?,?,?,?)'
                    'delete from user where name=?'
                    'updata user set status=? where name=?'
                    'select * from user where id=%s'
        :param value:[(123456,123456,123456,123456),(123,123,123,123)]
                value:'123456'
                value:(123,123)
        :return:result=[1,None]
        '''

        '''增、刪、查、改'''
        if isinstance(value,list) and isinstance(value[0],(list,tuple)):
            for valu in value:
                self.cursor.execute(sql, valu)
            else:
                self.conn.commit()
                result = [1, self.cursor.fetchall()]
        else:
            '''執(zhí)行單條語句：字符串、整型、數(shù)組'''
            if value:
                self.cursor.execute(sql, value)
            else:
                self.cursor.execute(sql)
            self.conn.commit()
            result = [1, self.cursor.fetchall()]
        return result

from dbUse import LiteDb

'''對(duì)于二次封裝的數(shù)據(jù)庫進(jìn)行測(cè)試'''
'''增刪查改'''

#用例
'''
select name from sqlite_master where type='table
select * from user
'select * from user where id = %s'%7
select * from user where id = ? , 7
select * from user where id=? or id=?, ['7','8']

insert  into user(id) values(7)
'insert  into user(id) values(%s)'%7
'insert  into user(id) values(?)',[('10',),('11',)]

delete from user where id=7
'delete from user where id=%s'%7
'delete from user where id=?',[('10',),('11',)]

update user set id=7 where id=11
'update user set id=%s where id=%s'%(10,20)
'update user set id=? where id=?',[('21','11'),('20','10')]'''


db=LiteDb()
db.openDb('user.db')

def close():
    db.closeDb()

def createTables():
    result=db.createTables('create table if not exists user(id varchar(128))')

def executeSQL():
    '''增刪查改'''
    result = db.executeSql('insert  into user(id) values(?)',('99',))
    result = db.executeSql('select * from user ')

executeSQL()
close()
 

# 位置傳遞實(shí)例:
def fun1(a, b, c):
    return a + b + c
print(fun1(1, 2, 3))

# 關(guān)鍵字傳遞
def fun2(a, b, c):
   return a + b + c
print(fun2(1, c=3, b=2))

# 默認(rèn)值傳遞
def fun3(a, b=2, c=3):
   return a + b + c
print(fun3(a=1))

def fun4(*name):
    print(type(name))
    print(name)
fun4((1, 2, 3))

def fun5(a, b, **kwargs):
   print(type(kwargs))  # <class 'dict'>
   print(a, b, kwargs)
fun5(2, 3, name='Alan.hsiang', age=23)