flask SQLAlchemy模型属性和MySQL数据库数据类型对应关系

类型名	Python类型	数据库类型
Integer	int 整数(4字节)	INT
SmallInteger	int取值范围小的整数(2字节)	SMALLINT
BigInteger	int或long	BIGINT
Float	float	FLOAT
Numeric	decimal.Decimal	DECIMAL
String	str	VARCHAR
Text	str	TEXT
Boolean	bool	BOOLEAN
Date	datetime.date	DATE
Time	datetime.time	TIME
DateTime	datetime.datetime	DATETIME
Enum	str	ENUM
LargeBinary	str	VARBINARY

使用：

...
db = SQLAlchemy()
...
class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(64), index=True, unique=True)
    email = db.Column(db.String(120), index=True, unique=True)
    password_hash = db.Column(db.String(128))
    about_me = db.Column(db.String(140))
    info = db.Column(db.Text)
    last_seen = db.Column(db.DateTime, default=datetime.utcnow)

    def __repr__(self):
        return ''.format(self.username)

参考:http://blog.51cto.com/13914991/2172809