一个注意点，就是sqlalchemy 使用create_all()建表的时候，要在 create_all()所在页面import那些表的model
sqlalchemy.exc.OperationalError: (_mysql_exceptions.OperationalError) (1074, "Column length too big for column ‘err_solution‘ (max = 21845); use BLOB or TEXT instead") [SQL: u‘\nCREATE TABLE amazon_errcode (\n\tcreate_date DATETIME, \n\tmodified_date DATETIME, \n\tid INTEGER NOT NULL AUTO_INCREMENT, \n\terr_code INTEGER, \n\terr_desc VARCHAR(1024), \n\terr_solution VARCHAR(65532), \n\tPRIMARY KEY (id)\n)\n\n‘]
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source:mysql中的char text blob
1074, "Column length too big for column 'err_solution' (max = 21845); use BLOB or TEXT instead"
原文：http://www.cnblogs.com/mxh1099/p/5502516.html