connection.ops.date_trunc_sql() 方法详解

Question

官网文档上没有找到详细的解释，谁举个例子帮忙解释下

Answer 1

问的如此简单草率，把困难留给别人。
好待你也要这样啊， 装一个开发工具pycharm，点进去源码看解释

from django import db
db.connection.ops.date_trunc_sql()

Answer 2

def date_trunc_sql(self, lookup_type, field_name):
    """
    Given a lookup_type of 'year', 'month' or 'day', returns the SQL that
    truncates the given date field field_name to a date object with only
    the given specificity.
    """