一、一对多的表查询
class Project(models.Model): name = models.CharField(u‘项目名称‘,max_length=32,blank=True) id = models.CharField(u‘项目ID‘,max_length=32,unique=True,primary_key=True,blank=True) create_date = models.DateTimeField(u‘创建时间‘, auto_now_add=True) update_date = models.DateTimeField(u‘更新时间‘, auto_now=True) def __unicode__(self): return self.name class Uhost(models.Model): name = models.CharField(u‘计算机名‘,max_length=32,blank=False) id = models.CharField(u‘实例ID‘,max_length=32,blank=False,primary_key=True) ip = models.GenericIPAddressField(u‘IP地址‘,blank=True,null=True) cpu = models.CharField(u‘CPU/核‘,max_length=32,blank=True,null=True) memory = models.CharField(U‘内存/G‘,max_length=32,blank=True) state = models.CharField(u‘实例状态‘,max_length=32,blank=True) expiretime = models.DateTimeField(u‘到期时间‘, max_length=50, null=True, blank=True) isexpire = models.CharField(u‘是否过期‘, max_length=20, blank=True) autorenew = models.CharField(u‘自动续费‘, max_length=20, blank=True) tag = models.CharField(u‘业务组‘,max_length=32,blank=True) networkstate = models.CharField(u‘网络状态‘,max_length=32,blank=True) type = models.CharField(u‘实例类型‘,max_length=32,blank=True) osfamily = models.CharField(u‘系统类型‘,max_length=32,blank=True) ostype = models.CharField(u‘操作系统‘, max_length=50, blank=True) chargetype = models.CharField(u‘付费类型‘, max_length=50, blank=True) datadisk = models.IntegerField(u‘数据盘/G‘, blank=True) price = models.DecimalField(u‘价格‘,max_digits=8,decimal_places=2,null=True,blank=True) zone = models.ForeignKey(Zone,verbose_name=u‘可用区‘,db_constraint=False,on_delete=models.DO_NOTHING,blank=True) project = models.ForeignKey(Project,verbose_name=u‘所属项目‘,db_constraint=False,on_delete=models.DO_NOTHING,blank=True) create_date = models.DateTimeField(u‘创建时间‘, auto_now_add=True) update_date = models.DateTimeField(u‘更新时间‘, auto_now=True) def __unicode__(self): return self.name
我建了两张表，project和uhost。
其中uhost表的project字段是设置了ForeignKey。
先看下project表中的内容。
>>> Project.objects.all()
[<Project: 上海别样红信息技术有限公司>, <Project: 备案专用>, <Project: gitlab>,
<Project: PublicTest>, <Project: SPMS>, <Project: 安全测试>, <Project: OTA>,
<Project: 99数据同步中转，本项目与99内网打通，不允许添加任何机器>, <Project: Ops>,
<Project: iPms>]
>>> Project.objects.all().values(‘id‘)
[{‘id‘: u‘org-81‘}, {‘id‘: u‘org-aws3dj‘}, {‘id‘: u‘org-et55qg‘},
{‘id‘: u‘org-ghan2t‘}, {‘id‘: u‘org-ja1wvv‘}, {‘id‘: u‘org-kbxrx4‘},
{‘id‘: u‘org-pni2a2‘}, {‘id‘: u‘org-qf4d2n‘}, {‘id‘: u‘org-vzfixt‘},
{‘id‘: u‘org-wrg10n‘}]
表查询：
查询uhost表中name中包含OPS10的所有主机对象
>>> Uhost.objects.filter(name__contains=‘OPS10‘) [<Uhost: SRV-OPS10-CS05>, <Uhost: SRV-OPS10-SPPX01>, <Uhost: SRV-OPS10-MAIL01>, <Uhost: SRV-OPS10-PROXY02>, <Uhost: SRV-OPS10-PROXY01>, <Uhost: SRV-OPS10-HAP02>, <Uhost: SRV-OPS10-HAP01>, <Uhost: SRV-OPS10-ANSIBLE02>, <Uhost: SRV-OPS10-NGX01>, <Uhost: SRV-OPS10-NGX02>, <Uhost: SRV-OPS10-PROXY05>, <Uhost: SRV-OPS10-ANSIBLE06>, <Uhost: SRV-OPS10-DEPLOY01>, <Uhost: SRV-OPS10-NGINX01>, <Uhost: SRV-OPS10-ES02>, <Uhost: SRV-OPS10-ES03>, <Uhost: SRV-OPS10-ES01>, <Uhost: SRV-OPS10-LOGSTASH01>, <Uhost: SRV-OPS10-PROXY04>, <Uhost: SRV-OPS10-PROXY03>, ‘...(remaining elements truncated)...‘]
正向查询：
若关系模型A包含与模型B关联的关联字段, 模型A的实例可以通过关联字段访问与其关联的模型B的实例:
Django提供了一种使用双下划线__的查询语法：
例如：
Uhost.objects.filter(project__id=‘org-81‘)
查找uhost表中，所有project id为‘org-81’的的主机
>>> Uhost.objects.filter(project__id=‘org-81‘) [<Uhost: dbbackupsyncer2>, <Uhost: SRV-CPMS10-WEB16>, <Uhost: SRV-CPMS10-WEB15>, <Uhost: publicconsole>, <Uhost: SRV-CPMS10-WEB14>, <Uhost: dbbackupsyncer>, <Uhost: 官网>, <Uhost: 99exchangedb>, <Uhost: dc1>, <Uhost: dc2>, <Uhost: publicweb>, <Uhost: SRV-CPMS10-WEB13>, <Uhost: SRV-OTA10-WS04>, <Uhost: SRV-OTA10-WS05>, <Uhost: SRV-OPS10-CS05>, <Uhost: SRV-OTA10-WS03>, <Uhost: SRV-OTA10-WEB04>, <Uhost: SRV-OTA10-WEB03>, <Uhost: 99datasyncer>, <Uhost: SRV-CPMS10-WEB31>, ‘...(remaining elements truncated)...‘]
查询uhost表中project id包含‘ghan’的主机信息
>>> Uhost.objects.filter(project__id__contains=‘ghan‘) [<Uhost: SRV-OPS10-ANSIBLE06>, <Uhost: SRV-OPS10-DEPLOY01>, <Uhost: SRV-OPS01-DEPLOY01>, <Uhost: SRV-OPS10-NGINX01>, <Uhost: SRV-OPS10-ES02>, <Uhost: SRV-OPS10-ES03>, <Uhost: SRV-OPS10-ES01>,<Uhost: SRV-OPS10-LOGSTASH01>]
反向查询：
被索引的关系模型可以访问所有参照它的模型的实例，如Entry.blog作为Blog的外键，默认情况下Blog.entry_set是包含所有参照Blog的Entry示例的查询集,可以使用查询集API取出相应的实例。
查询project name为Ops的所有主机对象
>>> Project.objects.get(name=‘Ops‘).uhost_set.all() [<Uhost: SRV-OPS10-ANSIBLE06>, <Uhost: SRV-OPS10-DEPLOY01>, <Uhost: SRV-OPS01-DEPLOY01>, <Uhost: SRV-OPS10-NGINX01>, <Uhost: SRV-OPS10-ES02>, <Uhost: SRV-OPS10-ES03>, <Uhost: SRV-OPS10-ES01>, <Uhost: SRV-OPS10-LOGSTASH01>]
查询project name为Ops的所有主机对象的name属性
>>> Project.objects.get(name=‘Ops‘).uhost_set.values(‘name‘)
[{‘name‘: u‘SRV-OPS10-ANSIBLE06‘}, {‘name‘: u‘SRV-OPS10-DEPLOY01‘}, {‘name‘: u‘SRV-OPS01-DEPLOY01‘}, {‘name‘: u‘SRV-OPS10-NGINX01‘}, {‘name‘: u‘SRV-OPS10-ES02‘}, {‘name‘: u‘SRV-OPS10-ES03‘}, {‘name‘: u‘SRV-OPS10-ES01‘}, {‘name‘: u‘SRV-OPS10-LOGSTASH01‘}]
查询project name为Ops的，并且name包含OPS字符串的所有主机
>>> Project.objects.get(name=‘Ops‘).uhost_set.filter(name__contains=‘OPS‘) [<Uhost: SRV-OPS10-ANSIBLE06>, <Uhost: SRV-OPS10-DEPLOY01>, <Uhost: SRV-OPS01-DEPLOY01>, <Uhost: SRV-OPS10-NGINX01>, <Uhost: SRV-OPS10-ES02>, <Uhost: SRV-OPS10-ES03>, <Uhost: SRV-OPS10-ES01>, <Uhost: SRV-OPS10-LOGSTASH01>]
时间： 2024-10-24 02:28:36