u'system.users',
u'test_abeen',
u'posts']
In [42]: posts.find_one() //从集合查找信息
Out[42]:
{u'_id': ObjectId('4c358492421aa91e70000000'),
u'author': u'Mike',
u'text': u'this is a test by abeen'}
In [52]: p.update({"author":"Mike"},{"$set":{"author":"abeen","text":"this is a test by abeen shan shan"}})//更新集合文档信息
In [55]: list(p.find())
Out[55]:
[{u'_id': ObjectId('4c358492421aa91e70000000'),
u'author': u'abeen',
u'text': u'this is a test by abeen shan shan'}]
In [96]: list(posts.find())
Out[96]:
[{u'_id': ObjectId('4c358492421aa91e70000000'),
u'author': u'Mike',
u'text': u'this is a test by abeen'},
{u'_id': ObjectId('4c358ad4421aa91e70000002'), u'a': u'aa', u'b': u'bb'},
{u'_id': ObjectId('4c358ad9421aa91e70000003'), u'a': u'aa', u'b': u'bb'},
{u'_id': ObjectId('4c358abb421aa91e70000001'),
u'a': u'abeen',
u'b': u'this bb is updated'}]
In [97]: posts.remove({"a":"abeen"}) //删除符合条件的文档
In [98]: list(posts.find())
Out[98]:
[{u'_id': ObjectId('4c358492421aa91e70000000'),
u'author': u'Mike',
u'text': u'this is a test by abeen'},
{u'_id': ObjectId('4c358ad4421aa91e70000002'), u'a': u'aa', u'b': u'bb'},
{u'_id': ObjectId('4c358ad9421aa91e70000003'), u'a': u'aa', u'b': u'bb'}]
In [102]: db.collection_names()
Out[102]:
[u'system.indexes',
u'fs.files',
u'fs.chunks',
u'test_gao',
u'system.users',
u'test_abeen',
u'posts',
u'doc_abeen']
In [104]: db.drop_collection("doc_abeen") //删除集合
In [105]: db.collection_names()
Out[105]:
[u'system.indexes',
u'fs.files',
u'fs.chunks',
u'test_gao',
u'system.users',
u'test_abeen',
u'posts']
代码
In [113]: result = db.posts.find({"a":"aa"})//查找
In [114]: type(result)
Out[114]: <class 'pymongo.cursor.Cursor'>
In [119]: list(result)
Out[119]:
[{u'_id': ObjectId('4c358ad4421aa91e70000002'), u'a': u'aa', u'b': u'bb'},
{u'_id': ObjectId('4c358ad9421aa91e70000003'), u'a': u'aa', u'b': u'bb'}]
find格式
find([spec=None[, fields=None[, skip=0[, limit=0[, timeout=True[, snapshot=False[, tailable=False[, sort=None[, max_scan=None[, as_class=None[, **kwargs]]]]]]]]]]])
代码
In [120]: db.posts.count()//当前集合文档数
Out[120]: 3
In [121]: type(db.posts)
Out[121]: <class 'pymongo.collection.Collection'>
In [138]: posts.rename('test_abeen')//重命名当前集合
In [139]: db.collection_names()
Out[139]:
[u'system.indexes',
u'fs.files',
