项目中 需要大量数据的保存操作，每条执行save操作效率太低，在官网上找到bull_create 的批量存储方式，效率提高很多
When creating objects, where possible, use the bulk_create() method to reduce the number of SQL queries. For example:
Entry.objects.bulk_create([ Entry(headline="Python 3.0 Released"), Entry(headline="Python 3.1 Planned") ])
...is preferable to:
Entry.objects.create(headline="Python 3.0 Released") Entry.objects.create(headline="Python 3.1 Planned")
Note that there are a number of caveats to this method, so make sure it’s appropriate for your use case.
This also applies to ManyToManyFields, so doing:
my_band.members.add(me, my_friend)
...is preferable to:
my_band.members.add(me)
my_band.members.add(my_friend)
...where Bands and Artists have a many-to-many relationship.
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