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 
