SQLMIGRATION flask design thread date

db_repository/versions/003_maintopic.py

@@ -0,0 +1,34 @@
+from sqlalchemy import *
+from migrate import *
+
+
+from migrate.changeset import schema
+pre_meta = MetaData()
+post_meta = MetaData()
+threads = Table('threads', post_meta,
+    Column('created_at', TIMESTAMP, nullable=False),
+    Column('updated_at', TIMESTAMP, nullable=False),
+    Column('id', Integer, primary_key=True, nullable=False),
+    Column('firstmail', Integer),
+    Column('date', DateTime),
+    Column('islabeled', Boolean),
+    Column('opened', Boolean),
+    Column('body', Text),
+    Column('maintopic', String),
+)
+
+
+def upgrade(migrate_engine):
+    # Upgrade operations go here. Don't create your own engine; bind
+    # migrate_engine to your metadata
+    pre_meta.bind = migrate_engine
+    post_meta.bind = migrate_engine
+    post_meta.tables['threads'].columns['maintopic'].create()
+
+
+def downgrade(migrate_engine):
+    # Operations to reverse the above upgrade go here.
+    pre_meta.bind = migrate_engine
+    post_meta.bind = migrate_engine
+    post_meta.tables['threads'].columns['maintopic'].drop()
+