# {py:mod}`ovo.core.database.base_db`

```{py:module} ovo.core.database.base_db
```

```{autodoc2-docstring} ovo.core.database.base_db
:allowtitles:
```

## Module Contents

### Classes

````{list-table}
:class: autosummary longtable
:align: left

* - {py:obj}`DBEngine <ovo.core.database.base_db.DBEngine>`
  -
````

### Data

````{list-table}
:class: autosummary longtable
:align: left

* - {py:obj}`T <ovo.core.database.base_db.T>`
  - ```{autodoc2-docstring} ovo.core.database.base_db.T
    :summary:
    ```
````

### API

````{py:data} T
:canonical: ovo.core.database.base_db.T
:value: >
   'TypeVar(...)'

```{autodoc2-docstring} ovo.core.database.base_db.T
```

````

`````{py:class} DBEngine
:canonical: ovo.core.database.base_db.DBEngine

Bases: {py:obj}`abc.ABC`

````{py:method} init()
:canonical: ovo.core.database.base_db.DBEngine.init

```{autodoc2-docstring} ovo.core.database.base_db.DBEngine.init
```

````

````{py:method} save(obj: ovo.core.database.models.Base)
:canonical: ovo.core.database.base_db.DBEngine.save
:abstractmethod:

```{autodoc2-docstring} ovo.core.database.base_db.DBEngine.save
```

````

````{py:method} save_all(objs: typing.Sequence[ovo.core.database.models.Base])
:canonical: ovo.core.database.base_db.DBEngine.save_all
:abstractmethod:

```{autodoc2-docstring} ovo.core.database.base_db.DBEngine.save_all
```

````

````{py:method} remove(model: typing.Type[ovo.core.database.base_db.T], *id_args, **kwargs)
:canonical: ovo.core.database.base_db.DBEngine.remove
:abstractmethod:

```{autodoc2-docstring} ovo.core.database.base_db.DBEngine.remove
```

````

````{py:method} save_value(model: typing.Type[ovo.core.database.base_db.T], column: str, value, *id_args, **kwargs)
:canonical: ovo.core.database.base_db.DBEngine.save_value
:abstractmethod:

```{autodoc2-docstring} ovo.core.database.base_db.DBEngine.save_value
```

````

````{py:method} count(model: typing.Type[ovo.core.database.base_db.T], field='id', **kwargs) -> typing.Sequence[ovo.core.database.base_db.T]
:canonical: ovo.core.database.base_db.DBEngine.count
:abstractmethod:

```{autodoc2-docstring} ovo.core.database.base_db.DBEngine.count
```

````

````{py:method} count_distinct(model: typing.Type[ovo.core.database.base_db.T], field='id', group_by=None, **kwargs) -> int
:canonical: ovo.core.database.base_db.DBEngine.count_distinct
:abstractmethod:

```{autodoc2-docstring} ovo.core.database.base_db.DBEngine.count_distinct
```

````

````{py:method} select(model: typing.Type[ovo.core.database.base_db.T], limit: int = None, order_by=None, **kwargs) -> typing.Sequence[ovo.core.database.base_db.T]
:canonical: ovo.core.database.base_db.DBEngine.select
:abstractmethod:

```{autodoc2-docstring} ovo.core.database.base_db.DBEngine.select
```

````

````{py:method} get(model: typing.Type[ovo.core.database.base_db.T], *id_args, **kwargs) -> ovo.core.database.base_db.T
:canonical: ovo.core.database.base_db.DBEngine.get
:abstractmethod:

```{autodoc2-docstring} ovo.core.database.base_db.DBEngine.get
```

````

````{py:method} get_value(model: typing.Type[ovo.core.database.base_db.T], column: str, *id_args, raw=False, **kwargs)
:canonical: ovo.core.database.base_db.DBEngine.get_value
:abstractmethod:

```{autodoc2-docstring} ovo.core.database.base_db.DBEngine.get_value
```

````

````{py:method} select_values(model: typing.Type[ovo.core.database.base_db.T], column: str, order_by=None, **kwargs) -> list
:canonical: ovo.core.database.base_db.DBEngine.select_values
:abstractmethod:

```{autodoc2-docstring} ovo.core.database.base_db.DBEngine.select_values
```

````

````{py:method} select_dict(model: typing.Type[ovo.core.database.base_db.T], key_column: str, value_column: str, order_by=None, **kwargs) -> dict
:canonical: ovo.core.database.base_db.DBEngine.select_dict
:abstractmethod:

```{autodoc2-docstring} ovo.core.database.base_db.DBEngine.select_dict
```

````

````{py:method} select_unique_values(model: typing.Type[ovo.core.database.base_db.T], column: str, **kwargs) -> set
:canonical: ovo.core.database.base_db.DBEngine.select_unique_values
:abstractmethod:

```{autodoc2-docstring} ovo.core.database.base_db.DBEngine.select_unique_values
```

````

````{py:method} select_descriptor_values(descriptor_key: str, design_ids: list[str]) -> pandas.Series
:canonical: ovo.core.database.base_db.DBEngine.select_descriptor_values
:abstractmethod:

```{autodoc2-docstring} ovo.core.database.base_db.DBEngine.select_descriptor_values
```

````

````{py:method} select_wide_descriptor_table(design_ids: list[str], descriptor_keys: list[str], **kwargs) -> pandas.DataFrame
:canonical: ovo.core.database.base_db.DBEngine.select_wide_descriptor_table
:abstractmethod:

```{autodoc2-docstring} ovo.core.database.base_db.DBEngine.select_wide_descriptor_table
```

````

````{py:method} __getattr__(name: str) -> ovo.core.database.db_proxy.DBProxy
:canonical: ovo.core.database.base_db.DBEngine.__getattr__

```{autodoc2-docstring} ovo.core.database.base_db.DBEngine.__getattr__
```

````

`````