migration.py 文件源码

def setup_database():
    if web.config.get('db_parameters'):
        db = web.database(**web.config.db_parameters)
        web.insert = db.insert
        web.select = db.select
        web.update = db.update
        web.delete = db.delete
        web.query = db.query

        def transact():
            t = db.transaction()
            web.ctx.setdefault('transaction_stack', []).append(t)

        def rollback():
            stack = web.ctx.get('transaction_stack')
            t = stack and stack.pop()
            t and t.rollback()

        def commit():
            stack = web.ctx.get('transaction_stack')
            t = stack and stack.pop()
            t and t.commit()

        web.transact = transact
        web.rollback = rollback
        web.commit = commit