Connection options

Author: tomchristie

README.md

@@ -18,7 +18,7 @@ It allows you to make queries using the powerful [SQLAlchemy Core][sqlalchemy-co
 expression language, and provides support for PostgreSQL, MySQL, and SQLite.
 
 Databases is suitable for integrating against any async Web framework, such as [Starlette][starlette],
-[Sanic][sanic], [Responder][responder], [Quart][quart], [aiohttp][aiohttp], [Tornado][tornado], [FastAPI][fastapi], 
+[Sanic][sanic], [Responder][responder], [Quart][quart], [aiohttp][aiohttp], [Tornado][tornado], [FastAPI][fastapi],
 or [Bocadillo][bocadillo].
 
 **Requirements**: Python 3.6+
@@ -220,6 +220,13 @@ database = Database('postgresql://localhost/example?ssl=true')
 database = Database('mysql://localhost/example?min_size=5&max_size=20')
 ```
 
+You can also use keyword arguments to pass in any connection options.
+Available keyword arguments may differ between database backends.
+
+```python
+database = Database('postgresql://localhost/example', ssl=True, min_size=5, max_size=20)
+```
+
 ## Test isolation
 
 For strict test isolation you will always want to rollback the test database

databases/backends/mysql.py

@@ -40,7 +40,13 @@ def _get_connection_kwargs(self) -> dict:
         if ssl is not None:
             kwargs["ssl"] = {"true": True, "false": False}[ssl.lower()]
 
-        kwargs.update(self._options)
+        for key, value in self._options.items():
+            # Coerce 'min_size' and 'max_size' for consistency.
+            if key == 'min_size':
+                key = 'minsize'
+            elif key == 'max_size'
+                key = 'maxsize'
+            kwargs[key] = value
 
         return kwargs