MySQL Update large field

<input id= "Btn_sealchange"  type= "button"  value= "Change Seal" class= "Btn btn-info" onclick= " Selectseal (${seal.sealimageid}); " ><input id= "Sealinfo"  name= "file"  type= "file" onchange= "Updateseal (${seal.sealimageid});" Style= "Display: none" >function selectseal ()  {document.getelementbyid ("Sealinfo"). Click (); Function updateseal (Sealimageupdateid)  {var sealinfo = {};sealinfo.sealimageupdateid  = sealimageupdateid;$.ajaxfileupload ( {url :  ' ${pagecontext.request.contextpath}/ Seal/uploadsealinfo.do ',secureuri : false,fileelementid :  ' Sealinfo ',dataType :  ' JSON ', Data : sealinfo,success : function (data, status)  {if  (data ==   "0")  {location.reload ();}  else {alert ("Upload failed"),}},error : function (data, status, e)  {alert (e);});} @RequestMapping (value =  "Uploadsealinfo") public  @ResPonsebody string uploadsealinfo (@RequestParam (value =  "file", required =  False)  multipartfile file, @RequestParam (value =  "Sealimageupdateid")  long id, Httpservletresponse response)  {try {byte[] sealbyte = file.getbytes (); Sealinfo sealinfo = new sealinfo (); Sealinfo.setfiledata (sealbyte); sealInfo.setId (ID); This.sealService.uploadSeal (sealinfo);return  "0";}  catch  (ioexception e)  {e.printstacktrace ();return  "-1";}}  <!-- mybatis   background update blob field data  --><update id= "Updatebyprimarykeyselective"  parametertype= "Com.itrus.msign.entity.SealInfo" >update seal_info set file_data=#{ Filedata}where id = #{id,jdbctype=bigint}   </update>

MySQL Update large field