上传图像/文件并将其转换为 mysql 数据库

Posted 2023-04-12

【中文标题】上传图像/文件并将其转换为 mysql 数据库

【英文标题】：Uploading and converting an image/file into a mssql databse

【发布时间】：2012-04-26 20:15:35

【问题描述】：

我想将图像/文件保存到 asp.net mvc3 项目中的 sql 数据库中。我发现了一些示例，他们必须将图像保存到数据库中，而没有其他任何东西。当我想使用控制器中的“创建”方法在我的数据库中添加一个“Inzending”实例时，我还需要将文件放入一个字节数组中。我必须同时将所有信息插入到我的数据库中，因为没有字段可能为空。我希望有人可以帮助我，我刚从学校开始，这是我必须解决的第一个真正的大问题（我觉得很难解决）。我已经写了一些代码：

控制器：

[HttpPost]
    public ActionResult Create(INZENDING inzending)
    

        string user = User.Identity.Name;
        var users = db.aspnet_Users.Single(p => p.UserName == user).UserId;
        inzending.Userid = users;

        int id = db.INZENDINGs.Count() + 1;
        inzending.InzendingNr = id;
        if (ModelState.IsValid)
        

            db.INZENDINGs.Add(inzending);
            db.SaveChanges();
            return RedirectToAction("Index");  
        
        ViewBag.ErfgoedNr = new SelectList(db.ERFGOEDFICHEs, "ErfgoedNr", "Naam", inzending.ErfgoedNr);
        ViewBag.Aard = new SelectList(db.INPUT_AARD, "Aard", "Aard", inzending.Aard);
        ViewBag.Type = new SelectList(db.INPUTTYPEs, "type", "type", inzending.Type);
        ViewBag.Status = new SelectList(db.STATUS, "Waarde", "Waarde", inzending.Status);
        return View(inzending);
    

查看：

 @model Erfgoed.Models.INZENDING

 @
ViewBag.Title = "Create";
 

<h2>Create</h2>

  <script src="@Url.Content("~/Scripts/jquery.validate.min.js")" type="text/javascript"></script>
  <script src="@Url.Content("~/Scripts/jquery.validate.unobtrusive.min.js")" type="text/javascript"></script>

@using (html.BeginForm()) 
@Html.ValidationSummary(true)
<fieldset>
    <legend>INZENDING</legend>

    <div class="editor-label">
        @Html.LabelFor(model => model.Titel)
    </div>
    <div class="editor-field">
        @Html.EditorFor(model => model.Titel)
        @Html.ValidationMessageFor(model => model.Titel)
    </div>

    <div class="editor-label">
        @Html.LabelFor(model => model.Auteur)
    </div>
    <div class="editor-field">
        @Html.EditorFor(model => model.Auteur)
        @Html.ValidationMessageFor(model => model.Auteur)
    </div>

    <div class="editor-label">
        @Html.LabelFor(model => model.Datum)
    </div>
    <div class="editor-field">
        @Html.EditorFor(model => model.Datum)
        @Html.ValidationMessageFor(model => model.Datum)
    </div>

    <div class="editor-label">
        @Html.LabelFor(model => model.bestandsgrootte)
    </div>
    <div class="editor-field">
        @Html.EditorFor(model => model.bestandsgrootte)
        @Html.ValidationMessageFor(model => model.bestandsgrootte)
    </div>

    <div class="editor-label">
        @Html.LabelFor(model => model.Type, "INPUTTYPE")
    </div>
    <div class="editor-field">
        @Html.DropDownList("Type", String.Empty)
        @Html.ValidationMessageFor(model => model.Type)
    </div>

    <div class="editor-label">
        @Html.LabelFor(model => model.Aard, "INPUT_AARD")
    </div>
    <div class="editor-field">
        @Html.DropDownList("Aard", String.Empty)
        @Html.ValidationMessageFor(model => model.Aard)
    </div>

    <div class="editor-label">
        @Html.LabelFor(model => model.ErfgoedNr, "ERFGOEDFICHE")
    </div>
    <div class="editor-field">
        @Html.DropDownList("ErfgoedNr", String.Empty)
        @Html.ValidationMessageFor(model => model.ErfgoedNr)
    </div>

    <div class="editor-label">
        @Html.LabelFor(model => model.bestand, "Bestand");
     </div>

</fieldset>

 
 <div>
     @Html.ActionLink("Back to List", "Index")
 </div>

型号：

namespace Erfgoed.Models

using System;
using System.Collections.Generic;

public partial class INZENDING

    public int InzendingNr  get; set; 
    public string Titel  get; set; 
    public string Auteur  get; set; 
    public System.DateTime Datum  get; set; 
    public string bestandsgrootte  get; set; 
    public string Type  get; set; 
    public string Aard  get; set; 
    public byte[] bestand  get; set; 
    public System.Guid Userid  get; set; 
    public int ErfgoedNr  get; set; 
    public string Status  get; set; 

    public virtual aspnet_Membership aspnet_Membership  get; set; 
    public virtual ERFGOEDFICHE ERFGOEDFICHE  get; set; 
    public virtual INPUT_AARD INPUT_AARD  get; set; 
    public virtual INPUTTYPE INPUTTYPE  get; set; 
    public virtual STATUS STATUS1  get; set; 
 

【参考方案1】：

    [HttpPost]
    public ActionResult Create(HttpPostedFileBase file, FormCollection collection)
    
        var attachment = new Attachment();
        if(TryUpdateModel(attachment))
        
            long length =
                file.InputStream.Length;
            attachment.Data = new byte[length];
            file.InputStream.Read(attachment.Data, 0, (int)length);
            attachmentRepository.Add(attachment);
            attachmentRepository.Save();

            return RedirectToAction("Index");
        

        return null;
    

这是我在 ms sql 数据库中保存文件的方式。对不起，如果我错误地理解了你的问题