55 lines
1.5 KiB
Markdown
55 lines
1.5 KiB
Markdown
# django-database-view
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A simple pluggable application that allows to work with database views.
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So far only MySQL is supported as backend, but more could be added if necessary.
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## Quick start
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1. Add "dbview" to your INSTALLED_APPS settings like this::
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INSTALLED_APPS = (
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...
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'dbview',
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)
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2. In your models.py create classes which extend dbview.models.DbView
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like this
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```python
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from django.db import models
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from dbview.models import DbView
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class ModelA(models.Model):
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fielda = models.CharField()
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fieldc = models.IntegerField()
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class MyView(DbView):
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fieldA = models.OneToOneField(ModelA, primary_key=True,
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db_column='fielda__id')
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fieldB = models.IntegerField(blank=True, null=True, db_column='fieldb')
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@classmethod
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def view(klass):
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'''
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This method returns the SQL string that creates the view, in this
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example fieldB is the result of annotating another column
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'''
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qs = modelA.objects.all().\
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annotate(fieldb=models.Sum('fieldc')) .\
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annotate(fielda__id=models.F('pk')) .\
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order_by('fielda__id') .\
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values('fielda__id', 'fieldb')
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return str(qs.query)
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```
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3. Then create a migration point for your view generation, edit that migration
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and modify it, add: `from dbview.helpers import CreateView` and replace the line
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the call to `migrations.CreateModel` with `CreateView`.
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4. Migrate your database and start using your database views.
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