如何将图片储存在MySQL数据库里?

2024-10-31 17:40:33
推荐回答(2个)
回答1:

解决方法一般有两种:

1、将图片保存的路径存储到数据库;

2、将图片以二进制数据流的形式直接写入数据库字段中。

以下为具体方法:

一、保存图片的上传路径到数据库:
string
uppath="";//用于保存图片上传路径
//获取上传图片的文件名
string fileFullname =
this.FileUpload1.FileName;
//获取图片上传的时间,以时间作为图片的名字可以防止图片重名
string
dataName =
DateTime.Now.ToString("yyyyMMddhhmmss");
//获取图片的文件名(不含扩展名)
string
fileName = fileFullname.Substring(fileFullname.LastIndexOf("\\") +
1);
//获取图片扩展名
string type =
fileFullname.Substring(fileFullname.LastIndexOf(".") +
1);
//判断是否为要求的格式
if (type == "bmp" || type == "jpg" || type == "jpeg"
|| type == "gif" || type == "JPG" || type == "JPEG" || type == "BMP" || type ==
"GIF")
{
//将图片上传到指定路径的文件夹
this.FileUpload1.SaveAs(Server.MapPath("~/upload")
+ "\\" + dataName + "." +
type);
//将路径保存到变量,将该变量的值保存到数据库相应字段即可
uppath
= "~/upload/" + dataName + "." +
type;
}
二、将图片以二进制数据流直接保存到数据库:
引用如下命名空间:
using
System.Drawing;
using System.IO;
using
System.Data.SqlClient;
设计数据库时,表中相应的字段类型为iamge
保存:
//图片路径
string
strPath = this.FileUpload1.PostedFile.FileName.ToString
();
//读取图片
FileStream fs = new System.IO.FileStream(strPath,
FileMode.Open, FileAccess.Read);
BinaryReader br = new
BinaryReader(fs);
byte[] photo =
br.ReadBytes((int)fs.Length);
br.Close();
fs.Close();
//存入
SqlConnection
myConn = new SqlConnection("Data Source=.;Initial Catalog=stumanage;User
ID=sa;Password=123");
string strComm = " INSERT INTO
stuInfo(stuid,stuimage) VALUES(107,@photoBinary
)";//操作数据库语句根据需要修改
SqlCommand myComm = new SqlCommand(strComm,
myConn);
myComm.Parameters.Add("@photoBinary", SqlDbType.Binary,
photo.Length);
myComm.Parameters["@photoBinary"].Value =
photo;
myConn.Open();
if (myComm.ExecuteNonQuery() >
0)
{
this.Label1.Text =
"ok";
}
myConn.Close();
读取:
...连接数据库字符串省略
mycon.Open();
SqlCommand
command = new
SqlCommand("select stuimage from stuInfo where stuid=107",
mycon);//查询语句根据需要修改
byte[] image = (byte[])command.ExecuteScalar
();
//指定从数据库读取出来的图片的保存路径及名字
string strPath =
"~/Upload/zhangsan.JPG";
string strPhotoPath =
Server.MapPath(strPath);
//按上面的路径与名字保存图片文件
BinaryWriter bw = new
BinaryWriter(File.Open(strPhotoPath,FileMode.OpenOrCreate));
bw.Write(image);
bw.Close();
//显示图片
this.Image1.ImageUrl
= strPath;
采用这两种方式可以根据实际需求灵活选择。

回答2:

背景

MySQL 一直以来都有 TEXT、BLOB 等类型用来存储图片、视频等大对象信息。比如一张图片,随便一张都 5M 以上。视频也是,随便一部视频就是 2G 以上。

假设用 MySQL 来存放电影视频等信息,一部是 2G,那么存储 1000 部就是 2TB,2TB 也就是 1000 条记录而已,但是对数据库性能来说,不仅仅是看记录数量,更主要的还得看占用磁盘空间大小。空间大了,所有以前的经验啥的都失效了。

所以一般来说存放这类信息,也就是存储他们的存放路径,至于文件本身存放在哪里,那这就不是数据库考虑的范畴了。数据库只关心怎么来的快,怎么来的小。


举例

虽然不推荐 MySQL 这样做,但是也得知道 MySQL 该怎么做才行,做到心里有数。比如下面一张微信图片,大概 5M 的样子。

root@ytt:/var/lib/mysql-files# ls -sihl 微信图片_20190711095019.jpg274501 5.4M -rw-r--r-- 1 root root 5.4M Jul 11 07:17 微信图片_20190711095019.jpg

拷贝 100 份这样的图片来测试

  • root@ytt:/var/lib/mysql-files# for i in `seq 1 100`; do cp 微信图片_20190711095019.jpg "$i".jpg;done;

  • root@ytt:/var/lib/mysql-files# ls

  • 100.jpg   17.jpg  25.jpg  33.jpg  41.jpg  4.jpg   58.jpg  66.jpg  74.jpg  82.jpg  90.jpg  99.jpg  f8.tsv

  • 10.jpg    18.jpg  26.jpg  34.jpg  42.jpg  50.jpg  59.jpg  67.jpg  75.jpg  83.jpg  91.jpg  9.jpg   微信图片_20190711095019.jpg

  • 1111.jpg  19.jpg  27.jpg  35.jpg  43.jpg  51.jpg  5.jpg   68.jpg  76.jpg  84.jpg  92.jpg  f1.tsv

  • 11.jpg    1.jpg   28.jpg  36.jpg  44.jpg  52.jpg  60.jpg  69.jpg  77.jpg  85.jpg  93.jpg  f2.tsv

  • 12.jpg    20.jpg  29.jpg  37.jpg  45.jpg  53.jpg  61.jpg  6.jpg   78.jpg  86.jpg  94.jpg  f3.tsv

  • 13.jpg    21.jpg  2.jpg   38.jpg  46.jpg  54.jpg  62.jpg  70.jpg  79.jpg  87.jpg  95.jpg  f4.tsv

  • 14.jpg    22.jpg  30.jpg  39.jpg  47.jpg  55.jpg  63.jpg  71.jpg  7.jpg   88.jpg  96.jpg  f5.tsv

  • 15.jpg    23.jpg  31.jpg  3.jpg   48.jpg  56.jpg  64.jpg  72.jpg  80.jpg  89.jpg  97.jpg  f6.tsv

  • 16.jpg    24.jpg  32.jpg  40.jpg  49.jpg  57.jpg  65.jpg  73.jpg  81.jpg  8.jpg   98.jpg  f7.tsv

  • 我们建三张表,分别用 LONGBLOB、LONGTEXT 和 VARCHAR 来存储这些图片信息

  • mysql> show create table tt_image1G

  • *************************** 1. row ***************************

  • Table: tt_image1

  • Create Table: CREATE TABLE `tt_image1` (

  • `id` int(11) NOT NULL AUTO_INCREMENT,

  • `image_file` longblob,

  • PRIMARY KEY (`id`)

  • ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci

  • 1 row in set (0.00 sec)

  • mysql> show create table tt_image2G

  • *************************** 1. row ***************************

  • Table: tt_image2

  • Create Table: CREATE TABLE `tt_image2` (

  • `id` int(11) NOT NULL AUTO_INCREMENT,

  • `image_file` longtext,

  • PRIMARY KEY (`id`)

  • ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci

  • 1 row in set (0.00 sec)

  • mysql> show create table tt_image3G

  • *************************** 1. row ***************************

  • Table: tt_image3

  • Create Table: CREATE TABLE `tt_image3` (

  • `id` int(11) NOT NULL AUTO_INCREMENT,

  • `image_file` varchar(100) DEFAULT NULL,

  • PRIMARY KEY (`id`)

  • ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci

  • 1 row in set (0.00 sec)

  • 我们来给三张表插入 100 张图片(插入前,建议把 max_allowed_packet 设置到最大)

  • tt_image1

  • root@ytt:/var/lib/mysql-files# for i in `seq 1 100`;

  • do mysql -S /var/run/mysqld/mysqld.sock -e "insert into ytt.tt_image1(image_file)

  • values (load_file('/var/lib/mysql-files/$i.jpg'))";done;

  • tt_image2

  • root@ytt:/var/lib/mysql-files# for i in `seq 1 100`;

  • do mysql -S /var/run/mysqld/mysqld.sock -e "insert into ytt.tt_image2(image_file)

  • values (hex(load_file('/var/lib/mysql-files/$i.jpg')))";done;

  • tt_image3

  • root@ytt:/var/lib/mysql-files# aa='begin;';for i in `seq 1 100`;

  • do aa=$aa"insert into ytt.tt_image3(image_file) values

  • ('/var/lib/mysql-files/$i.jpg');";

  • done;aa=$aa'commit;';mysql -S /var/run/mysqld/mysqld.sock -e "`echo $aa`";

  • 检查下三张表记录数

  • mysql> select 'tt_image1' as name ,count(*) from tt_image1 union allselect 'tt_image2',count(*) from tt_image2 union all select 'tt_image3', count(*) from tt_image3;+-----------+----------+| name      | count(*) |+-----------+----------+| tt_image1 |      100 || tt_image2 |      100 || tt_image3 |      100 |+-----------+----------+3 rows in set (0.00 sec)

  • 看下文件大小,可以看到实际大小排名,LONGTEXT 字段存储的最大,LONGBLOB 字段缩小到一半,最小的是存储图片路径的表 tt_image3。所以这里从存储空间来看,存放路径最占优势。

  • root@ytt:/var/lib/mysql/ytt# ls -silhS tt_image*274603 1.1G -rw-r----- 1 mysql mysql 1.1G Jul 11 07:27 tt_image2.ibd274602 545M -rw-r----- 1 mysql mysql 544M Jul 11 07:26 tt_image1.ibd274605  80K -rw-r----- 1 mysql mysql 112K Jul 11 07:27 tt_image3.ibd

  • 那么怎么把图片取出来呢?

    tt_image3 肯定是最容易的

  • mysql> select * from tt_image3;+----+----------------------------+| id | image_file                 |+----+----------------------------+|  1 | /var/lib/mysql-files/1.jpg |+----+----------------------------+...100 rows in set (0.00 sec)

  • tt_image1 直接导出来二进制文件即可,下面我写了个存储过程,导出所有图片。

  • mysql> DELIMITER $$mysql> USE `ytt`$$mysql> DROP PROCEDURE IF EXISTS `sp_get_image`$$mysql> CREATE DEFINER=`ytt`@`localhost` PROCEDURE `sp_get_image`()mysql> BEGIN      DECLARE i,cnt INT DEFAULT 0;      SELECT COUNT(*) FROM tt_image1 WHERE 1 INTO cnt;      WHILE i < cnt DO        SET @stmt = CONCAT('select image_file from tt_image1  limit ',i,',1 into dumpfile ''/var/lib/mysql-files/image',i,'.jpg''');        PREPARE s1 FROM @stmt;        EXECUTE s1;        DROP PREPARE s1;      SET i = i + 1;      END WHILE;      END$$mysql> DELIMITER ;mysql> call sp_get_image;

  • tt_image2 类似,把 select 语句里 image_file 变为 unhex(image_file) 即可。

    总结

    这里我举了个用 MySQL 来存放图片的例子,总的来说有以下三点:

  • 占用磁盘空间大(这样会带来各种各样的功能与性能问题,比如备份,写入,读取操作等)

  • 使用不易

  • 还是推荐用文件路径来代替实际的文件内容存放

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