added engine_from_config() function for helping to create_engine()

from an .ini style config

3 files changed, 40 insertions, 2 deletions

diff --git a/lib/sqlalchemy/__init__.py b/lib/sqlalchemy/__init__.py
index ab12ecf4b..bdd3604de 100644
--- a/lib/sqlalchemy/__init__.py
+++ b/lib/sqlalchemy/__init__.py
@@ -7,7 +7,7 @@
 from sqlalchemy.types import *
 from sqlalchemy.sql import *
 from sqlalchemy.schema import *
-from sqlalchemy.engine import create_engine
+from sqlalchemy.engine import create_engine, engine_from_config
 
 
 __version__ = 'svn'
diff --git a/lib/sqlalchemy/engine/__init__.py b/lib/sqlalchemy/engine/__init__.py
index 2ef163c03..acac8180c 100644
--- a/lib/sqlalchemy/engine/__init__.py
+++ b/lib/sqlalchemy/engine/__init__.py
@@ -48,6 +48,7 @@ The package is represented among several individual modules, including:
 import sqlalchemy.databases
 from sqlalchemy.engine.base import *
 from sqlalchemy.engine import strategies
+from sqlalchemy import util
 
 def engine_descriptors():
     """Provide a listing of all the database implementations supported.
@@ -151,3 +152,30 @@ def create_engine(*args, **kwargs):
     strategy = kwargs.pop('strategy', default_strategy)
     strategy = strategies.strategies[strategy]
     return strategy.create(*args, **kwargs)
+
+def engine_from_config(configuration, prefix='sqlalchemy.', **kwargs):
+    """Create a new Engine instance using a configuration dictionary.
+    
+    the dictionary is typically produced from a config file where keys are prefixed,
+    such as sqlalchemy.url, sqlalchemy.echo, etc.  The 'prefix' argument indicates 
+    the prefix to be searched for.
+    
+    A select set of keyword arguments will be "coerced" to their expected type based on 
+    string values.  in a future release, this functionality will be expanded to include 
+    dialect-specific arguments.
+    """
+    
+    opts = dict([(key[len(prefix):], configuration[key]) for key in configuration if key.startswith(prefix)])
+    for opt, type_ in (
+        ('convert_unicode', bool),
+        ('pool_timeout', int),
+        ('echo', bool),
+        ('echo_pool', bool),
+        ('pool_recycle', int),
+    ):
+        util.coerce_kw_type(opts, opt, type_)
+    opts.update(kwargs)
+    url = opts.pop('url')
+    return create_engine(url, **opts)
+
+    
\ No newline at end of file
diff --git a/lib/sqlalchemy/engine/url.py b/lib/sqlalchemy/engine/url.py
index 98d4d442e..31546bae8 100644
--- a/lib/sqlalchemy/engine/url.py
+++ b/lib/sqlalchemy/engine/url.py
@@ -66,7 +66,17 @@ class URL(object):
             keys.sort()
             s += '?' + "&".join(["%s=%s" % (k, self.query[k]) for k in keys])
         return s
-
+    
+    def __eq__(self, other):
+        return \
+            isinstance(other, URL) and \
+            self.drivername == other.drivername and \
+            self.username == other.username and \
+            self.password == other.password and \
+            self.host == other.host and \
+            self.database == other.database and \
+            self.query == other.query
+            
     def get_dialect(self):
         """Return the SQLAlchemy database dialect class corresponding to this URL's driver name."""
         dialect=None