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