ibatis-blob

blob操作，我们一般用于存视频，图片，文档

下面是一个上传图片到数据库保存下来，然后下载的例子(上传和下载的前端代码就不展示了，已有功能展示了)

    @RequestMapping("ibatisLiveSqlController!insertBlob.do")
    public String insertBlob(@RequestParam(value = "theFile") MultipartFile file) throws Exception{
        Img img = new Img();
        img.setImg_name(file.getOriginalFilename());
        img.setImg(file.getBytes());
        ibatisLiveSqlService.insertImg(img);
        return JSON;
    }

    @Override
    public void insertImg(Img img) {
        if(ValidateUtil.isEmpty(img)){
            throw new AppException("对象为空!");
        }
        img.setId(getSequence("SEQ_IMGS_PLANS"));
        dao.insert("clobblob.insertImg", img);
    }

     <insert id="insertImg" parameterClass="com.yinhai.demo.domain.Img">
         insert into imgs (id, img_name, img) values (#id#, #img_name#, #img,javaType=[B,jdbcType=BLOB#)
     </insert>

     <resultMap id="imgResult" class="com.yinhai.demo.domain.Img">
         <result column="ID" property="id" jdbcType="VARCHAR2" javaType="String"/>
         <result column="IMG_NAME" property="img_name" jdbcType="VARCHAR2" javaType="String"/>
         <result column="IMG" property="img" jdbcType="BLOB" javaType="[B" />
     </resultMap>

     <select id="queryImgById" parameterClass="String" resultMap="imgResult">
         select  id,
                 img_name,
                 img
         FROM imgs
         WHERE id = #id#
     </select>

     @RequestMapping("ibatisLiveSqlController!downloadImg.do")
     public String downloadImg() throws Exception{
         HttpServletRequest request = getRequest();
         Img img = (Img)getDao().queryForObject("clobblob.queryImgById", request.getParameter("id"));
         HttpServletResponse response = getResponse();
         response.reset();
         response.setHeader("Content-Disposition", "attachment; filename=\"" + img.getImg_name() + "\"");
         response.setContentType("application/octet-stream;charset=UTF-8");
         OutputStream outputStream = new BufferedOutputStream(response.getOutputStream());
         outputStream.write(img.getImg());
         outputStream.flush();
         outputStream.close();
         return JSON;
     }