that's work. tks.
在 2018年7月26日星期四 UTC+8下午6:16:10，Simon King写道： > > On Thu, Jul 26, 2018 at 11:03 AM Yingchen Zhang <cevin....@gmail.com > <javascript:>> wrote: > > > > old model > > > > class User(db.Model): > > __tablename__ = 'users' > > id = db.Column(db.BigInteger, primary_key=True) > > name = db.Column(db.VARCHAR(50), nullable=False) > > > > email = db.Column(db.VARCHAR(200), nullable=False) > > > > time = db.Column(db.INTGER, nullable=False) > > > > > > new model > > > > class User(db.Model): > > __tablename__ = 'users' > > id = db.Column(db.BigInteger, primary_key=True) > > name = db.Column(db.VARCHAR(50), nullable=False) > > > > email = db.Column(db.VARCHAR(200), nullable=False) > > > > time = db.Column(db.TIMESTAMP(timezone=True), nullable=False) > > > > > > new database table and is still empty, so do not ask why... emmmm > > > > I use flask-sqlalchemy migration tool. When I modified User mode and run > `python manager.py db migrate`.got : > > > > `INFO [alembic.env] No changes in schema detected.` > > > > So, Sqlalchemy migrate tool only support create and drop ? > > Alembic (the library that flask-sqlalchemy is using for migrations) > supports changing column types. However, it doesn't *auto-detect* > changes of column types by default: > > > http://alembic.zzzcomputing.com/en/latest/autogenerate.html#what-does-autogenerate-detect-and-what-does-it-not-detect > > > """ > Autogenerate can optionally detect: > > Change of column type. This will occur if you set the > EnvironmentContext.configure.compare_type parameter to True, or to a > custom callable function. The feature works well in most cases, but is > off by default so that it can be tested on the target schema first. It > can also be customized by passing a callable here; see the section > Comparing Types for details. > """ > > Hope that helps, > > Simon > -- SQLAlchemy - The Python SQL Toolkit and Object Relational Mapper http://www.sqlalchemy.org/ To post example code, please provide an MCVE: Minimal, Complete, and Verifiable Example. See http://stackoverflow.com/help/mcve for a full description. --- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sqlalchemy+unsubscr...@googlegroups.com. To post to this group, send email to sqlalchemy@googlegroups.com. Visit this group at https://groups.google.com/group/sqlalchemy. For more options, visit https://groups.google.com/d/optout.
