- figuring out script format

- figuring out operation system

1 files changed, 31 insertions, 0 deletions

diff --git a/alembic/context.py b/alembic/context.py
new file mode 100644
index 0000000..27771da
--- /dev/null
+++ b/alembic/context.py
@@ -0,0 +1,31 @@
+from alembic.ddl import base
+
+class ContextMeta(type):
+    def __init__(cls, classname, bases, dict_):
+        newtype = type.__init__(cls, classname, bases, dict_)
+        if '__dialect__' in dict_:
+            _context_impls[dict_['__dialect__']] = newtype
+        return newtype
+
+_context_impls = {}
+    
+class DefaultContext(object):
+    __metaclass__ = ContextMeta
+    
+    def __init__(self, options, connection):
+        self.options = options
+        self.connection = connection
+        
+    def alter_column(self, table_name, column_name, 
+                        nullable=NO_VALUE,
+                        server_default=NO_VALUE,
+                        name=NO_VALUE,
+                        type=NO_VALUE
+    ):
+    
+        if nullable is not NO_VALUE:
+            base.ColumnNullable(table_name, column_name, nullable)
+        if server_default is not NO_VALUE:
+            base.ColumnDefault(table_name, column_name, server_default)
+    
+        # ... etc
\ No newline at end of file