* experimental: support connection strings for databases using connectorx
This adds an experimental support for connector strings using connectorx.
User has to provide config for the connection strings with:
Example:
```console
dvc config --local db_connection.pg postgres://user:pass@localhost:5432/database
```
And then, they can import using:
```console
dvc import-db --sql 'query' --conn pg
```
Check supported databases and how to configure in https://sfu-db.github.io/connector-x/databases.html.
This `db_connection` config is subject to change.
connectorx still has the same problem with dbt as before: no support for streaming,
but it'll be a bit more simpler to configure with the connection strings.
* add pandas to deps
* sqlalchemy
* dbt streaming sql
* fix test
* remove connectorx
* remove check in set
* use mode='wb' for serialization
* try to close dvc.state on exit
I have a feeling that it is causing the issues with
shutil.copytree and some PermissionError during 'init',
as we are not closing it between multiple 'main()' calls.
But I am not quite sure, and this seems like a good thing to
do anyway.
* fixup
* close dvc on exit
* close cache on tests and on init
Currently we don't handle bad name well:
```
(dvc-3.8.3) ➜ dvc git:(config-bug) ✗ dvc config section
ERROR: unexpected error - not enough values to unpack (expected 2, got 1)
```
With this PR, we check name to conform to either `remote.name.option` or
`section.option`, so we'll give a more friendly:
```
(dvc-3.8.3) ➜ dvc git:(config-bug) ✗ dvc config section
ERROR: argument name: name argument should look like remote.name.option or section.option
usage: dvc config [-h] [--global | --system | --local] [-q | -v] [-u] [-l] [name] [value]
Get or set config options.
Documentation: <https://man.dvc.org/config>
positional arguments:
name Option name (remote.name.option or section.option).
value Option value.
optional arguments:
-h, --help show this help message and exit
--global Use global config.
--system Use system config.
--local Use local config.
-q, --quiet Be quiet.
-v, --verbose Be verbose.
-u, --unset Unset option.
-l, --list List all defined config values.
```
skshetry
Saugat Pachhai (सौगात)
karajan1001
Paweł Redzyński
Ruslan Kuprieiev
Batuhan Taskaya
Robert Lowry
Casper da Costa-Luis