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108 lines
4.1 KiB
Markdown
108 lines
4.1 KiB
Markdown
# Database plugin
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The database plugin is installed by default in every copy of Baserow. Without it you
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can't really do anything with the application. In short this is the plugin that allows
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creating a database with a spreadsheet-like interface. You will notice that everything
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has been built around this concept.
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## Tables
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Each database application can have multiple tables and a table is exactly what you
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might suspect. It contains rows and columns, but in Baserow the columns are called fields.
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Every table has its own schema representation in the PostgreSQL database.
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There is a `baserow.contrib.database.table.handler.TableHandler` handler class that has
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all kinds of methods related to creating, modifying, and deleting tables. Another nice
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thing is that a Django model of the table can easily be generated. Let's say you have
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the following table with id `id` and you want select all the data.
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| Model name | Brand | Price |
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|------------|-------|-------|
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| 3 Series | BTW | 30000 |
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| A4 | Audi | 25000 |
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| Model 3 | Tesla | 50000 |
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```python
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from baserow.contrib.database.table.models import Table
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cars_table = Table.objects.get(pk=ID_REFERENCED_TABLE_ABOVE)
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# If you set the attribute_names to True the attribute name is going to be the field
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# name provided by the user instead of field_{id}
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cars_model = cars_table.get_model(attribute_names=True)
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for car in cars_model.objects.all():
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print(car.id, car.model_name, car.price)
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# Results in:
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# 1 3 series 30000
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# 2 A4 30000
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# 2 Model 3 30000
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```
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## Fields
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A field is actually a column definition of a table. It accepts only a certain data type
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for its cell values. A field can, for example, be a number field that accepts two
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placements after the comma. If a new field is added to a table it is also added as
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column to the table representation in the database. The column name in the database
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will be field_{id}. The fields can be created, modified and deleted via the
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`baserow.contrib.database.fields.handler.FieldHandler` and via the REST API. Several
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field types have been included by default.
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> Field types can be added via plugins. More about that on the
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> [field type plugin page](../plugins/field-type.md).
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* `text`: Single line text.
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* `long_text`: Multi line text.
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* `number`: A number that can optionally be negative and optionally be a decimal.
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* `boolean`: Just holds true or false.
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* `date`: A date field in EU, ISO or USA format that can optionally include time am/pm
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format.
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## Views
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Views define how the table data is displayed to the user. By default the `grid` view
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type is included, which displays the data in a spreadsheet-like interface. Multiple
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views can be added to each table and each view has its own settings. If you, for
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example, have two grid views, A and B, of the same table of data, and you change the
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width of a column in grid A, then it only changes for grid A and not for grid B. The
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views can be created, modified and deleted via the
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`baserow.contrib.database.views.handler.ViewHandler` and via the REST API.
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> View types can be added via plugins. More about that on the
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> [view type plugin page](../plugins/view-type.md).
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### Rows
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Rows are the table data. The values that are accepted depend on the fields of the
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table. The data is stored in the representation table in the database. In the example
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below we will insert a single row of data in a table we have just created via the
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python shell. The same result could be achieved via the REST API.
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```python
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from django.contrib.auth import get_user_model
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from baserow.contrib.database.table.models import Table
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from baserow.contrib.database.fields.handler import FieldHandler
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from baserow.contrib.database.rows.handler import RowHandler
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User = get_user_model()
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user = User.objects.get(pk=1)
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table = Table.objects.get(pk=10)
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name = FieldHandler().create_field(user, table, 'text', name='Name')
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price = FieldHandler().create_field(user, table, 'number', name='Price')
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row = RowHandler().create_row(user, table, {
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f'field_{name.id}': 'Smartphone',
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f'field_{price.id}': 300
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})
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model = table.get_model()
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rows = model.objects.all()
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print(rows[0].name)
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print(rows[0].price)
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# Which will result in:
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# Smartphone
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# 300
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```
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