Mybatis中把 blob（java.sql.blob）插入mysql数据库（mediumblob） 报错 20
错误代码：Typehandlerwasnullonparametermappingforproperty'picture'.Itwaseithernotspecified...
错误代码：Type handler was null on parameter mapping for property 'picture'. It was either not specified and/or could not be found for the javaType / jdbcType combination specified.
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