纯Python开发的nosql数据库CodernityDB介绍和使用实例

Insert(simple)
 
from CodernityDB.database import Database
 
db = Database('/tmp/tut1')
db.create()
 
insertDict = {'x': 1}
print db.insert(insertDict)
 
 
　
 
Insert
 
from CodernityDB.database import Database
from CodernityDB.hash_index import HashIndex
 
class WithXIndex(HashIndex):
    def __init__(self, *args, **kwargs):
        kwargs['key_format'] = 'I'
        super(WithXIndex, self).__init__(*args, **kwargs)
 
    def make_key_value(self, data):
        a_val = data.get("x")
        if a_val is not None:
            return a_val, None
        return None
 
    def make_key(self, key):
        return key
 
db = Database('/tmp/tut2')
db.create()
 
x_ind = WithXIndex(db.path, 'x')
db.add_index(x_ind)
 
print db.insert({'x': 1})
　
　
 
Count
 
from CodernityDB.database import Database
 
db = Database('/tmp/tut1')
db.open()
 
print db.count(db.all, 'x')
　
 
Get
 
from CodernityDB.database import Database
 
db = Database('/tmp/tut2')
db.open()
 
print db.get('x', 1, with_doc=True)
　
 
Delete
 
from CodernityDB.database import Database
 
db = Database('/tmp/tut2')
db.open()
 
curr = db.get('x', 1, with_doc=True)
doc  = curr['doc']
 
db.delete(doc)
　
　
 
Update
 
from CodernityDB.database import Database
 
db = Database('/tmp/tut2')
db.create()
 
curr = db.get('x', 1, with_doc=True)
doc  = curr['doc']
 
doc['Updated'] = True
db.update(doc)