mybatis存取blob类型数据（Mysql）

本是古典何须时尚 2022-04-27 20:06 554阅读 0赞

### 大纲 ###

相比于网上的其他教程，我觉得我的xml文件是相对简单的。不信看我的Mapper。总而言之，存成BLOB时用Byte\[\]。从数据库中取出来用String接收就可以了。和其他人分析的不一样。但是我这样成功了。

### Controller ###

package com.qust.shbz.util.controller;
    
    import com.qust.shbz.util.ImgBean;
    import com.qust.shbz.util.R;
    import com.qust.shbz.util.service.UploadFileService;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestBody;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;
    import org.springframework.web.bind.annotation.ResponseBody;
    
    import java.util.List;
    
    @Controller
    @RequestMapping("/upload")
    public class UploadFile {
    
        @Autowired
        private UploadFileService uploadFileService;
    
        @RequestMapping(value="/upload", method = {RequestMethod.POST })
        @ResponseBody
        public R upload(@RequestBody List<ImgBean> imgBeans) throws Exception{
            return R.ok("result",uploadFileService.uploadImg(imgBeans));
        }
    
        @RequestMapping(value="/getTp", method = {RequestMethod.POST })
        @ResponseBody
        public R getTp(String tyshxym){
            List<ImgBean> tp = uploadFileService.getTp(tyshxym);
    
            return R.ok("result",tp);
        }
    
    
    }

### Service ###

package com.qust.shbz.util.service.impl;
    
    import com.qust.shbz.util.ImgBean;
    import com.qust.shbz.util.service.UploadFileService;
    import com.qust.shbz.util.mapper.UploadFileMapper;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Service;
    
    import java.util.List;
    
    /**
     * @ClassName: UploadFileServiceImpl
     * @Description:  上传文件的业务层
     * @Author: ZhaoHualuo
     * @Date: 2019/6/9 22:36
     * @Version: 1.0
     */
    @Service
    public class UploadFileServiceImpl implements UploadFileService {
    
        @Autowired
        private UploadFileMapper uploadFileMapper;
    
        @Override
        public int uploadImg(List<ImgBean> imgBeans) {
            int flag = 1;
            int insert = 1;
            for (int i = 0; i < imgBeans.size(); i++) {
                insert = uploadFileMapper.insertImg(imgBeans.get(i));
                if (insert != 1) {
                    flag = 0;
                }
            }
            return flag;
        }
    
        @Override
        public List<ImgBean> getTp(String tyshxym) {
            List<ImgBean> tp = uploadFileMapper.getTp(tyshxym);
            return tp;
        }
    }

### Mapper ###

package com.qust.shbz.util.mapper;
    
    import com.github.abel533.mapper.Mapper;
    import com.qust.shbz.util.ImgBean;
    import org.apache.ibatis.annotations.Insert;
    import org.apache.ibatis.annotations.Select;
    
    import java.util.List;
    
    /**
     * @ClassName: UploadFileMapper
     * @Description:  文件上传数据库操作
     * @Author: ZhaoHualuo
     * @Date: 2019/6/9 22:38
     * @Version: 1.0
     */
    public interface UploadFileMapper extends Mapper<ImgBean> {
    
        @Insert({"insert into img(id,name,base64) values(#{id},#{name},#{base64Byte})"})
        public int insertImg(ImgBean imgBean);
    
        @Select({"select * from img where id = #{tyshxym}"})
        public List<ImgBean> getTp(String tyshxym);
    }

### Bean ###

package com.qust.shbz.util;
    
    import java.io.UnsupportedEncodingException;
    import java.sql.Blob;
    
    /**
     * @ClassName: ImgBean
     * @Description:  图片上传实体类
     * @Author: ZhaoHualuo
     * @Date: 2019/6/9 21:56
     * @Version: 1.0
     */
    public class ImgBean {
        //主键，自动递增
        private int key;
    
        //文件名
        private String name;
    
        //公司标志，图片属于该公司
        private String id;
    
        //图片转换的base64字符，取的时候用这个
        private String base64;
    
        //byte[]形式的base64格式,BLOB,存的时候用这个
        private byte[] base64Byte;
    
        public String getName() {
            return name;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    
        public String getId() {
            return id;
        }
    
        public void setId(String id) {
            this.id = id;
        }
    
        public int getKey() {
            return key;
        }
    
        public void setKey(int key) {
            this.key = key;
        }
    
        public String getBase64() {
            return base64;
        }
    
        public void setBase64(String base64) throws UnsupportedEncodingException {
            this.base64 = base64;
            this.base64Byte = base64.getBytes("UTF8");
        }
    
        public byte[] getBase64Byte() {
            return base64Byte;
        }
    
        public void setBase64Byte(byte[] base64Byte) {
            this.base64Byte = base64Byte;
        }
    }