代码如下:
select to_char(date_published,'yyyymm') yo from blog group by yo;
转换成sqlalchemy 语句
可以使用 extract()
代码如下:
In[3]: year_field = db.func.extract('year',ArticleModel.date_published) In[4]: month_field = db.func.extract('month',ArticleModel.date_published) In[5]: yonth_field = year_field *100+ month_field In[6]:print db.session.query(yonth_field.label('yonth'),db.func.count(1)).group_by('yonth') SELECT EXTRACT(year FROM article_Meta.date_published)*:param_1 + EXTRACT(month FROM article_Meta.date_published)AS yonth,count(:param_2)AS count_1
FROM article_Meta JOIN article ON article_Meta.id = article.id GROUPBY yonth
FROM article_Meta JOIN article ON article_Meta.id = article.id GROUPBY yonth
也可以 可以通过 func 直接调用数据库支持的函数或存储过程
代码如下:
yonth = db.func.to_char(ArticleModel.date_published,'yyyymm').label('yonth')
archive_list =(db.session.query(yonth,
db.func.count(1)).group_by('yonth').all())
archive_list =(db.session.query(yonth,
db.func.count(1)).group_by('yonth').all())
