python - Django原始查询动态查询

Question

我有这个模型:

class Stock(models.Model):
    productstockid = models.AutoField(db_column='ProductStockID', primary_key=True)
    productid = models.ForeignKey(Product, models.DO_NOTHING, db_column='ProductID')
    quantity = models.IntegerField(db_column='Quantity')
    stocklocationid = models.ForeignKey('StockLocation', models.DO_NOTHING, db_column='StockLocationID')

    class Meta:
        unique_together = ('productid', 'stocklocationid',)
        managed = False
        db_table = 'stock'

要在列中填充库存位置表(django-tables2)，我需要这样的查询。

query_text = 'SELECT *'
for s in StockLocation.objects.all():
    query_text += ', SUM(CASE WHEN stocklocationid_id = ' + str(s.stocklocationid) + ' THEN quantity ELSE 0 END) AS ' + s.sl_name
query_text += ' FROM stock GROUP BY productid'
datatest = Stock.objects.raw(query_text)

但是它不起作用。 Django 能够管理它吗？

Answer 1

表名称的格式为appname_modelname。例如，如果您的应用名称为 mystock，则您的 SQL 语句应以以下内容结尾:

query_text += ' FROM mystock_stock GROUP BY productid_id'