映射数据库时报错：sqlalchemy.exc.CompileError: (in table 'user', column 'username'): VARCHAR requires a length on dialect mysql
错误代码：
username = db.Column(db.String)
String需要指定长度，如：
username = db.Column(db.String(50))
sqlalchemy.exc.CompileError: (in table 'user', column 'username'): VARCHAR requires a length on dialect mysql
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