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在写练习小项目的修改书籍功能，发现报： Unknown column 'imgs' in 'field list'，上网搜索了许久都不能解决
然后一步步调试发现，
book_image是varchar类型，原来是一个低级的小错误，少了单引号
''
update T_BOOK set
book_name=?,book_name_pinyin=?, book_category_id=?,
book_author=?,book_price=?,publishing=?,
book_desc=? ,
book_image=
imgs/zwtp.jpg where book_id=?
update T_BOOK set
book_name=?,book_name_pinyin=?, book_category_id=?,
book_author=?,book_price=?,publishing=?,
book_desc=? ,
book_image=
'
imgs/zwtp.jpg'
where book_id=?