django orm 批量存储数据

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

Insert in bulk

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.