[英]How to convert a query to django ORM Query
我試圖弄清楚如何將以下查詢轉換為Djangon ORM查詢。 我在Windows上使用Django 2.1 Python 3.5,正在嘗試對Oracle數據庫運行查詢
SELECT m.msg_no, q.seq, To_Char(m.date_created,'yyyy/mm/dd hh24:mi:ss'), To_Char(SYSDATE,'yyyy/mm/dd hh24:mi:ss'), q.name, Round((round(SYSDATE - m.date_created,6)*1440),1) AS msg_age
FROM message m
INNER JOIN queue q ON m.queue = q.seq
WHERE m.date_created >= (SYSDATE - 13/24)
AND m.status1 = 0
AND m.direction = 0;
我有兩個模型,想知道如何做到最好,表Message和Queue由Queue主鍵SEQ和Message外鍵QUEUE關聯,所以Message表中的SEQ == QUEUE:
from django.db import models
# Create your models here.
class Queue(models.Model):
SEQ = models.IntegerField(primary_key=True,)
NAME = models.CharField(max_length = 50)
INPUT_DRIVER = models.IntegerField()
OUTPUT_DRIVER = models.IntegerField()
DIRECTION = models.IntegerField()
ORIGINATOR = models.IntegerField()
DESTINATOR = models.IntegerField()
PRIORITY = models.IntegerField()
INPUTEXEC = models.CharField(max_length = 100)
OUTPUTEXEC = models.CharField(max_length = 100)
USERID = models.CharField(max_length = 8)
TMSTAMP = models.DateTimeField(max_length = 7)
QUEUE_TYPE = models.CharField(max_length = 16)
class Meta:
db_table = "QUEUE"
#
class Message(models.Model):
MSG_NO = models.IntegerField(primary_key=True,)
MSG_TYPE = models.IntegerField()
DIRECTION = models.IntegerField()
SESSION_NO = models.IntegerField()
SEQUENCE_NO = models.IntegerField()
REF_SESSION = models.IntegerField()
REF_SEQUENCE = models.IntegerField()
ACKTIME = models.DateTimeField(max_length = 7)
ACKNAKSTATUS = models.IntegerField()
PRIORITY = models.CharField(max_length = 1)
DELIVMONITOR = models.IntegerField()
OBSOLESCENCE = models.IntegerField()
DISPOSITION = models.IntegerField()
TRAILER = models.IntegerField()
BYPASSED = models.IntegerField()
RESPONSE_QUEUE = models.IntegerField()
SOURCE_QUEUE = models.IntegerField()
QUEUE = models.IntegerField()
QUEUE_PRIORITY = models.IntegerField()
DATE_CREATED = models.DateTimeField(max_length = 7)
DATE_ROUTED = models.DateTimeField(max_length = 7)
INPUT_FILE = models.IntegerField()
OUTPUT_FILE = models.IntegerField()
STATUS1 = models.IntegerField()
STATUS2 = models.IntegerField()
STATUS3 = models.IntegerField()
USERID = models.CharField(max_length = 8)
TMSTAMP = models.DateTimeField(max_length = 7)
class Meta:
db_table = "MESSAGE"
如果要使用Django的ORM來構建該查詢,則應使用關系字段 。
首先,建議您將字段更改為:
QUEUE = models.ForeignKey(to=Queue, on_delete=models.PROTECT)
然后嘗試這樣的事情:
import datetime
from django.utils import timezone as tz
now = tz.now()
filter_date = now - datetime.timedelta(hours=...something...)
qs = Message.objects.filter(
STATUS1=0, DIRECTION=0, DATE_CREATED__gte=filter_date)
您可能需要研究QuerySet.annotate()
。
這仍然需要進行調整,以適合您的確切查詢,但是我的答案應該是,但是您在正確的方向上可以解決它。
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.