将图像装入MySQL数据库

/* Image Database Functions
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by: J. Patrick Ryans [email protected] July 1998
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The following are provided niether with copyright or warranty. I do not
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believe that any of the code in this file is copyrighted by anyone else, but
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if it is, please let me know.
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I gathered these functions from a larger php3 project to manage a
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large and dynamic web site by keeping all html, images, and other file
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contained in a MySQL database. I couldn't find one single example that
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explained how to insert binary images into a database and then extract them
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and display it to the browser.
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The two major functions needed to load and display images are shown below,
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but I have left out many details such as how to connect to the database,
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how to use html forms, etc. That information can be picked up from a number
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of places. I.e. check out:
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http://webdev.berber.co.il
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for examples of how to connect to a database, and
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http://liquid-sky.media.mit.edu/file_upload.html
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for how to use forms to upload files
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My database has a table for storing binary data such as images and other
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types. The schema is as follows:
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#
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# Table structure for table 'binary'
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#
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CREATE TABLE binary (
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id int(11) DEFAULT '0' NOT NULL auto_increment,
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title varchar(200) DEFAULT '' NOT NULL,
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auth_id varchar(16) DEFAULT '' NOT NULL,
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description varchar(200),
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category varchar(50) DEFAULT '' NOT NULL,
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body longblob,
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cr_date date,
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datestamp timestamp(14),
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type varchar(50) DEFAULT '' NOT NULL,
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KEY category (category),
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KEY title (title),
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KEY auth_id (auth_id),
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PRIMARY KEY (id)
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);
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*/
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/* Loading binary files into the database
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There isn't room here to show the html forms, how to connect to the
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database and the code for uploading the file into the database, so I'm
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going to have to be a little terse here. I'm going to assume that you
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know how to use forms to upload files, and I'm going to assume that you
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know how to connect to your database which has a table of structure
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similar to the schema shown above.
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This script is expecting to recieve the following variables from the form:
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$title // the title of the file
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$auth_id // the id name of the author - field is specific to my needs
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$desc // a short description
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$cat // category, for organization purposes.
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$type // mime type - something like "image/gif"
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Be forewarned, error checking is very minimal in this routine, you will
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probably want to do some more sanity checking in a production environment.
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In my forms, I query the database to present a select list of valid author
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ids and mime types.
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*/
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<? // load.php3
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include "admin_connect.ini"; // connect as a user with insert auth.
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include "main_h.inc"; // an html header for the page
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echo "<center>n";
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$date = date("Y-m-d");
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//$title = htmlentities($title); // you may want to clean up the input
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// with statements like this.
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// Check to see if a file was included in the input="file" tag
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if(chop($fileinput)!=""){
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// $fileinput should point to a temp file on the server
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// which contains the uploaded image. so we will prepare
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// the file for upload with addslashes and form an sql
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// statement to do the load into the database.
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$image = addslashes(fread(fopen($fileinput,"r"), 1000000));
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$SQL = "Insert Into $PhotoTable
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(title,auth_id,description,category,body,cr_date,type) values ('$title',
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'$auth_id', '$desc', '$cat', '$image','$date','$type')";
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// now we can delete the temp file
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unlink($fileinput);
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}
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else{
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echo "no file entered on form";
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exit;
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}
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$Result = mysql_db_query ( $DB, $SQL );
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if($Result==0){
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echo "unsuccessful add";
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}
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else{
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echo "successful add";
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}
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include "main_f.inc";
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?>
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/* Displaying an image from the database.
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This is a very simple way to display the image that was loaded in the above
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script. In this case we will query the image by title, but it would be
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a simple matter to add other queries.
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You must have the mime type for the image stored in the record with the
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image data. As per the schema above, the mime type is stored in the 'type'
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field.
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Be careful that any includes and initialization files do not send anything
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to the browser. You want the Header("Content-type: $type"); to be the first
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line served.
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To use the following script to display an image, use an image tag similar
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to the following:
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<img src="http://www.chinaitpower.com/A/2001-12-13/image.php3?title=myimage.gif">
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*/
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<? // image.php3
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// connect to database with select access
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include "user_connect.ini";
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$SQL = "select body,type from $PhotoTable where title='$title'";
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$Show = mysql ( $hDB, $hSQL );
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$Rows = mysql_num_rows($hShow);
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if($Rows<1){
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// no image matches this query
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}
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else{
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// at least one image has this title
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$getPhoto = mysql_fetch_object($Show);
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// we need to determine the mime type
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$Type = $getPhoto->type;
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// and send the correct header to the browser
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Header("Content-type: $Type");
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// now send the image
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$Body = $getPhoto->body;
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echo $Body;
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flush();
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}
?>
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