MongoEngine由Python语言写成，提供一个很类似DjangoORM的API用于访问MongoDB数据库。
示例代码：
class BlogPost(Document): title = StringField(required=True, max_length=200) posted = DateTimeField(default=datetime.datetime.now) tags = ListField(StringField(max_length=50))class TextPost(BlogPost): content = StringField(required=True)class LinkPost(BlogPost): url = StringField(required=True)# Create a text-based post>>> post1 = TextPost(title='Using MongoEngine', content='See the tutorial')>>> post1.tags = ['mongodb', 'mongoengine']>>> post1.save()# Create a link-based post>>> post2 = LinkPost(title='MongoEngine Docs', url='hmarr.com/mongoengine')>>> post2.tags = ['mongoengine', 'documentation']>>> post2.save()# Iterate over all posts using the BlogPost superclass>>> for post in BlogPost.objects:... print '===', post.title, '==='... if isinstance(post, TextPost):... print post.content... elif isinstance(post, LinkPost):... print 'Link:', post.url... print...>>> len(BlogPost.objects)2>>> len(TextPost.objects)1>>> len(LinkPost.objects)1# Find tagged posts>>> len(BlogPost.objects(tags='mongoengine'))2>>> len(BlogPost.objects(tags='mongodb'))1
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