C# 如何把图片放到sql server数据库中

Posted 2023-03-05 张铎（信念）

以前，我们都是往数据库中放string int 等等类型的数据，在机房合作中，需要把图片也存到数据库中需要怎么存呢，经过一番研究，晓得了需要把图片转换成二进制，放到数据库中。下面用C#把图片放到sql中的方法。

第一步： 将图片转换成二进制存入到sql数据库中

            //打开本地路径
            openFileDialog1.ShowDialog();
            //获取当前选择的图片
            this.pictureBox2.Image = Image.FromStream(this.openFileDialog1.OpenFile());

            //获取当前图片的路径
            string path = openFileDialog1.FileName.ToString();
            //将制定路径的图片添加到FileStream类中    
            FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read);
            //通过FileStream对象实例化BinaryReader对象
            BinaryReader br = new BinaryReader(fs);
            //通过BinaryReader类对象的ReadBytes()方法将FileStream类对象转化为二进制数组
            byte[] imgBytesIn = br.ReadBytes(Convert.ToInt32(fs.Length));
            CodeEntity code = new CodeEntity();
            code.codeName = "微信二维码";
            code.codepic = imgBytesIn;
            CodeFacade codefa = new CodeFacade();
            bool falg = codefa.InsertCode(code);

第二步：D层插入数据库图片

      /// <summary>
      /// 添加二维码
      /// </summary>
      /// <returns></returns>
        public int InsertCode(CodeEntity code)
        
           
           
                string sql = "insert into T_Code (codeName,codepic) values (@codeName,@codepic)";
                SqlParameter[] ps =
                
                new SqlParameter("@codeName",code.codeName),
                new SqlParameter("@codepic",code.codepic)
               
            ;
                return SqlHelper.ExecuteNonQuery(sql, System.Data.CommandType.Text, ps);
            
        


        /// <summary>
        /// 查询二维码
        /// </summary>
        /// <returns></returns>
        public List<CodeEntity> SelectCode(CodeEntity code)
        
            SqlParameter[] p =  new SqlParameter("@codeName", code.codeName),

            ;
            string sql = "select * from T_Code where codeName=@codeName";

            DataTable dt = SqlHelper.GetDataTable(sql, CommandType.Text, p);
            ConvertSQLHelper convert = new ConvertSQLHelper();
            List<CodeEntity> list = convert.ConvertToModel<CodeEntity>(dt);
            return list;
        
    

第三步：从数据库中提取图片

            laballcash.Text = FrmShopping.allmoney;
            CodeEntity code = new CodeEntity();
            code.codeName = "微信二维码";
            CodeFacade codefa = new CodeFacade();
            List<CodeEntity> codes = codefa.SelectCode(code);
            MemoryStream mss = null;
            byte[] bytes = (byte[])codes[0].codepic;
            mss = new MemoryStream(bytes);
            this.pictureBox1.Image = Image.FromStream(mss);


          

最后生成效果图：