search
HomeDatabaseMysql Tutorial被人忽视的sqlserver数据类型

SqlServer 中有一种数据类型是 Image ,用来存储图片大小不超过 2g 的图片,将图片转换为二进制!缺点是占用了很大的数据存储空间。但是现对于之前的存储物理路径来说读取图片和存储图片方便了很多。 那么图片在 MVC 程序中是如何存入数据库,并从数据库显示

  SqlServer中有一种数据类型是Image,用来存储图片大小不超过2g的图片,将图片转换为二进制!缺点是占用了很大的数据存储空间。但是现对于之前的存储物理路径来说读取图片和存储图片方便了很多。

  那么图片在MVC程序中是如何存入数据库,并从数据库显示到页面上的呢:

  下面是一个简单的小例子:

private string sqlconn = "Data Source=;Initial Catalog=Image;Persist Security Info=True;User ID=sa;Password=123456";
        //
        // GET: /UpDownload/

        public ActionResult Index()
        {
            return View();
        }
        [HttpPost]
        [ValidateInput(false)]
        public bool Upload(HttpPostedFileBase[] fileToUpload)
        {

            string path = "";

            try
            {

                //TODDO:读取任何地方的路径
                foreach (HttpPostedFileBase file in fileToUpload)
                {
                    path = System.IO.Path.Combine(Server.MapPath("~/"), "uploadimage\\" + System.IO.Path.GetFileName("00" + file.FileName.Substring(file.FileName.LastIndexOf("."))));

                    //写入数据库


                    file.SaveAs(path);

                    //将需要存储的图片读取为数据流
                    FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read);
                    Byte[] imgbtye = new byte[fs.Length];
                    fs.Read(imgbtye, 0, Convert.ToInt32(fs.Length));
                    fs.Close();

                    using (SqlConnection conn = new SqlConnection(sqlconn))
                    {
                        conn.Open();
                        SqlCommand cmd = new SqlCommand();
                        cmd.Connection = conn;
                        cmd.CommandText = "insert into T_TeacherImage(TeacherImage) values(@imgfile)";
                        SqlParameter par = new SqlParameter("@imgfile", SqlDbType.Image);
                        par.Value = imgbtye;
                        cmd.Parameters.Add(par);
                        cmd.ExecuteNonQuery();

                    }

                }

                return true;
            }
            catch
            {
                return false;
            }

        }



        #region 读取文件直接显示到视图上
        public void Read()
        {
            byte[] MyData = new byte[0];
            using (SqlConnection conn = new SqlConnection(sqlconn))
            {
                conn.Open();
                SqlCommand cmd = new SqlCommand();
                cmd.Connection = conn;
                cmd.CommandText = "select TeacherImage from T_TeacherImage where id='1'";
                SqlDataReader sdr = cmd.ExecuteReader();
                sdr.Read();
                MyData = (byte[])sdr["TeacherImage"];
                Response.ContentType = "image/gif";
                Response.BinaryWrite(MyData);
                conn.Close();

            }

        }
        #endregion
那么图片又是如何显示到网页上的呢,很简单:

		if (xhr.readyState == 4 && xhr.status == 200) {
		
		
		        $('#personimg').attr("src", "http://localhost:55576/UpDownload/Read");
		        
		    }

这个demo的实现环境是MVC,图片的获取路径是,当前服务主机地址/controller/action

怎么样,sqlserver为图片的读写,提供了很多方便之处吧!


Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
What are some tools you can use to monitor MySQL performance?What are some tools you can use to monitor MySQL performance?Apr 23, 2025 am 12:21 AM

How to effectively monitor MySQL performance? Use tools such as mysqladmin, SHOWGLOBALSTATUS, PerconaMonitoring and Management (PMM), and MySQL EnterpriseMonitor. 1. Use mysqladmin to view the number of connections. 2. Use SHOWGLOBALSTATUS to view the query number. 3.PMM provides detailed performance data and graphical interface. 4.MySQLEnterpriseMonitor provides rich monitoring functions and alarm mechanisms.

How does MySQL differ from SQL Server?How does MySQL differ from SQL Server?Apr 23, 2025 am 12:20 AM

The difference between MySQL and SQLServer is: 1) MySQL is open source and suitable for web and embedded systems, 2) SQLServer is a commercial product of Microsoft and is suitable for enterprise-level applications. There are significant differences between the two in storage engine, performance optimization and application scenarios. When choosing, you need to consider project size and future scalability.

In what scenarios might you choose SQL Server over MySQL?In what scenarios might you choose SQL Server over MySQL?Apr 23, 2025 am 12:20 AM

In enterprise-level application scenarios that require high availability, advanced security and good integration, SQLServer should be chosen instead of MySQL. 1) SQLServer provides enterprise-level features such as high availability and advanced security. 2) It is closely integrated with Microsoft ecosystems such as VisualStudio and PowerBI. 3) SQLServer performs excellent in performance optimization and supports memory-optimized tables and column storage indexes.

How does MySQL handle character sets and collations?How does MySQL handle character sets and collations?Apr 23, 2025 am 12:19 AM

MySQLmanagescharactersetsandcollationsbyusingUTF-8asthedefault,allowingconfigurationatdatabase,table,andcolumnlevels,andrequiringcarefulalignmenttoavoidmismatches.1)Setdefaultcharactersetandcollationforadatabase.2)Configurecharactersetandcollationfor

What are triggers in MySQL?What are triggers in MySQL?Apr 23, 2025 am 12:11 AM

A MySQL trigger is an automatically executed stored procedure associated with a table that is used to perform a series of operations when a specific data operation is performed. 1) Trigger definition and function: used for data verification, logging, etc. 2) Working principle: It is divided into BEFORE and AFTER, and supports row-level triggering. 3) Example of use: Can be used to record salary changes or update inventory. 4) Debugging skills: Use SHOWTRIGGERS and SHOWCREATETRIGGER commands. 5) Performance optimization: Avoid complex operations, use indexes, and manage transactions.

How do you create and manage user accounts in MySQL?How do you create and manage user accounts in MySQL?Apr 22, 2025 pm 06:05 PM

The steps to create and manage user accounts in MySQL are as follows: 1. Create a user: Use CREATEUSER'newuser'@'localhost'IDENTIFIEDBY'password'; 2. Assign permissions: Use GRANTSELECT, INSERT, UPDATEONmydatabase.TO'newuser'@'localhost'; 3. Fix permission error: Use REVOKEALLPRIVILEGESONmydatabase.FROM'newuser'@'localhost'; then reassign permissions; 4. Optimization permissions: Use SHOWGRA

How does MySQL differ from Oracle?How does MySQL differ from Oracle?Apr 22, 2025 pm 05:57 PM

MySQL is suitable for rapid development and small and medium-sized applications, while Oracle is suitable for large enterprises and high availability needs. 1) MySQL is open source and easy to use, suitable for web applications and small and medium-sized enterprises. 2) Oracle is powerful and suitable for large enterprises and government agencies. 3) MySQL supports a variety of storage engines, and Oracle provides rich enterprise-level functions.

What are the disadvantages of using MySQL compared to other relational databases?What are the disadvantages of using MySQL compared to other relational databases?Apr 22, 2025 pm 05:49 PM

The disadvantages of MySQL compared to other relational databases include: 1. Performance issues: You may encounter bottlenecks when processing large-scale data, and PostgreSQL performs better in complex queries and big data processing. 2. Scalability: The horizontal scaling ability is not as good as Google Spanner and Amazon Aurora. 3. Functional limitations: Not as good as PostgreSQL and Oracle in advanced functions, some functions require more custom code and maintenance.

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

MantisBT

MantisBT

Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.

SAP NetWeaver Server Adapter for Eclipse

SAP NetWeaver Server Adapter for Eclipse

Integrate Eclipse with SAP NetWeaver application server.

ZendStudio 13.5.1 Mac

ZendStudio 13.5.1 Mac

Powerful PHP integrated development environment

VSCode Windows 64-bit Download

VSCode Windows 64-bit Download

A free and powerful IDE editor launched by Microsoft

SublimeText3 Linux new version

SublimeText3 Linux new version

SublimeText3 Linux latest version