adding sqlalchemy-migrate glue

* add a product and producttype table (addresses #1)
 * add a person table and reference to customers table (fixes #8)
 * use sqlalchemy-migrate's API to setup database and add
   configuration for the sqlalchemy-migrate calls to development.ini
   and the paste_deploy template (fixes #7)


git-svn-id: file:///var/www/wwwusers/usr01/svn/pyalchemybiz/trunk@7 389c73d4-bf09-4d3d-a15e-f94a37d0667a

data/dbrepo/versions/001_Add_initial_tables.py

@@ -0,0 +1,29 @@
+from sqlalchemy import MetaData, Table, Column, ForeignKey, types
+from migrate import *
+
+def upgrade():
+    # Upgrade operations go here. Don't create your own engine; use the engine
+    # named 'migrate_engine' imported from migrate.
+    meta = MetaData(bind=migrate_engine)
+    t_product_type = Table(
+        'producttype', meta,
+        Column('id', types.Integer, primary_key=True),
+        Column('name', types.Unicode(40), nullable=False),
+        Column('description', types.UnicodeText(), nullable=False))
+    t_product_type.create()
+    t_product = Table(
+        'product', meta,
+        Column('id', types.Integer, primary_key=True),
+        Column('name', types.Unicode(100), nullable=False),
+        Column('description', types.UnicodeText(), nullable=False),
+        Column('producttype_id', types.Integer,
+               ForeignKey(t_product_type.c.id), nullable=False))
+    t_product.create()
+
+def downgrade():
+    # Operations to reverse the above upgrade go here.
+    meta = MetaData(bind=migrate_engine)
+    t_product = Table('product', meta, autoload=True)
+    t_product.drop()
+    t_product_type = Table('product_type', meta, autoload=True)
+    t_product_type.drop()

data/dbrepo/versions/002_Add_customer_tables.py

@@ -0,0 +1,27 @@
+from sqlalchemy import MetaData, Table, Column, ForeignKey, types
+from migrate import *
+
+def upgrade():
+    # Upgrade operations go here. Don't create your own engine; use the engine
+    # named 'migrate_engine' imported from migrate.
+    meta = MetaData(bind=migrate_engine)
+    t_person = Table(
+        'person', meta,
+        Column('id', types.Integer, primary_key=True),
+        Column('firstname', types.Unicode(100), nullable=False),
+        Column('lastname', types.Unicode(100), nullable=False))
+    t_person.create()
+    t_customer = Table(
+        'customer', meta,
+        Column('id', types.Integer, primary_key=True),
+        Column('person_id', types.Integer, ForeignKey(t_person.c.id),
+               nullable=False, unique=True))
+    t_customer.create()
+
+def downgrade():
+    # Operations to reverse the above upgrade go here.
+    meta = MetaData(bind=migrate_engine)
+    t_customer = Table('customer', meta, autoload=True)
+    t_customer.drop()
+    t_person = Table('person', meta, autoload=True)
+    t_person.drop()