JsonDB的一个使用实例

JsonDB是一个python实现的基于JSON格式的轻量级数据库开源项目，你可以通过github进行下载和安装，项目地址是：https://github.com/hujiang001/jsonDB/ 。

作者提供了完整的参考文档，而且是中文的，所以上手非常容易，这是他的中文文档的地址：https://github.com/hujiang001/jsonDB/wiki/reference-document 。 当前在项目工程里面也是包含了这个文档：reference.md。

项目还提供了一个使用的实例，在example.py中，下面我们把这个例子粘贴出来，上面有详细的注释，可以看出使用起来还是挺简单的：

#!usr/bin/env python# -*- coding: utf-8 -*-from database import JSONDBif __name__=="__main__":
    shopDb = JSONDB('shop_db',hashSize=1)  #create shop db
    userDb = JSONDB('sellerDb',hashSize=1) #create user db
    #specify key
    shopDb.ensureKey('shop',['id'])
    shopDb.ensureKey('goods',['id'])
    userDb.ensureKey('seller',['id','name'])
    userDb.ensureKey('customer',['id','name'])    #for debugging, you can start perfDot and open debug switch
    shopDb.perfDotStart()
    userDb.perfDotStart()
    shopDb.debugSwitch(1)
    userDb.debugSwitch(1)    #insert data
    #here we insert some data
    for i in range(0,100):        #insert data one by one
        shopDb.insert('shop',[{'id':i, 'name':'my shop', 'description':'this is a telephone shop'}])    #inset a data list
    goodsList = [{'id':10001, 'class':'telephone', 'brand':'apple', 'color':'white'},
                 {'id':10002, 'class':'telephone', 'brand':'huawei', 'color':'black'},
                 {'id':10003, 'class':'telephone', 'brand':'zte', 'color':'white'},
                 {'id':10004, 'class':'telephone', 'brand':'xiaomi', 'color':'black'},
                 {'id':10005, 'class':'telephone', 'brand':'moto', 'color':'white'},
                 {'id':10006, 'class':'telephone', 'brand':'oppo', 'color':'black'},]
    shopDb.insert('goods',goodsList)
    sellersList = [{'id':0x34200,'name':'li','sex':'female','birth':'1985-09-03','tel':'0816-19876545432'},
                   {'id':0x34201,'name':'wang','sex':'male','birth':'1988-11-03','tel':'0816-2345453453'},
                   {'id':0x34202,'name':'hong','sex':'female','birth':'1995-10-19','tel':'0816-144567589'}]
    userDb.insert('seller',sellersList)
    customersList = [{'id':0x7800,'name':'zhu','sex':'female','profile':['dress','mother','sport']},
                   {'id':0x7801,'name':'rong','sex':'male','profile':['baby','read','tech']},
                   {'id':0x7802,'name':'guo','sex':'female','profile':['phone','dress','food']}]
    userDb.insert('customer',customersList)    #export to default file
    shopDb.exportToFile()
    userDb.exportToFile(fileName='user')    #find
    # find with key
    findList = shopDb.find('goods',filter={'id':{'$lt':10004}})
    JSONDB.rprint(findList)
    findList = shopDb.find('goods',filter={'id':10004})
    JSONDB.rprint(findList)
    findList = userDb.find('customer',filter={'name':'guo'})
    JSONDB.rprint(findList)    #delete
    shopDb.delete('goods',{'id':10005})    #update
    shopDb.update('goods',set={'class':'phone'})    #merge
    shopDb.merge(userDb)
    shopDb.exportToFile('mergeDb')    #show pref time
    shopDb.perfDotEnd()
    userDb.perfDotEnd()    #import
    importDb = JSONDB('importDb')
    importDb.debugSwitch(1)
    importDb.importFromFile(fileName='mergeDb')    #importDb.printAll()
    importDb.exportToFile()    print importDb