用PHP实现把图象上传到数据库

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  今天教给大家如何用PHP实现把图象上传到MYSQL数据库中。 在这个教程中我们需要建立3个PHP文件:

  readdir.php – 把图片放到数据库的代码
  image.php – 显示实际图片的代码
  view.php – 显示你如何调用数据库中的图片的代码

1.创建一个数据库

CREATE TABLE `images` (
`imgid` INT NOT NULL AUTO_INCREMENT ,
`sixfourdata` LONGTEXT NOT NULL ,
PRIMARY KEY ( `imgid` )
);
READDIR.PHP

具体的内容:
<?
$dbcnx = mysql_connect(“localhost”, “username”, “password”);
mysql_select_db(“base64imgdb”);
?>
‘我们需要打开一个目录
“./”
‘readdir.php 文件定位于这个目录:
$path = “./”;
$dir_handle = opendir($path) or die(“Unable to open directory $path”);

  下面是比较难的部分,大家需要好好研究一下:把图象分类,并且读出正在使用的一些数据

fopen

‘转换

base64_encode

‘ 插入到表里

<?
while ($file = readdir($dir_handle)) {
$filetyp = substr($file, -3);
if ($filetyp == ‘gif’ OR $filetyp == ‘jpg’) {
$handle = fopen($path . “/” . $file,’r’);
$file_content = fread($handle,filesize($path . “/” . $file));
fclose($handle);
$encoded = chunk_split(base64_encode($file_content));
$sql = “INSERT INTO images SET sixfourdata=’$encoded'”;
mysql_query($sql);
}
}
?>

  关闭设置的目录,然后处理:

<?
closedir($dir_handle);
echo(“complete”);
mysql_close($dbcnx);
?>

  读出图片的代码:IMAGE.PHP
  这段代码比较难,我们要好好看看

<?
$dbcnx = mysql_connect(“localhost”, “username”, “password”);
mysql_select_db(“base64imgdb”);
?>
我们读出图片使用的代码image.php?img=x:
<?
$img = $_REQUEST[“img”];
?>
之后我们需要连接数据库,然后读出
<?
$result = mysql_query(“SELECT * FROM images WHERE imgid=” . $img . “”);
if (!$result) {
echo(“<b>请求错误: ” . mysql_error() . “</b>”);
exit();
}
while ($row = mysql_fetch_array($result)) {
$imgid = $row[“imgid”];
$encodeddata = $row[“sixfourdata”];
}
?>

<?
mysql_close($dbcnx);
echo base64_decode($encodeddata);
?>

  在这里我们要理解base64-encoded 图象数据格式。

  ”让我们来看看具体的图片吧!” VIEW.PHP

image.php?img=1

image.php?img=357

<img src=’image.php?img=1′ border=”0″ alt=””>

看看完整的一个例子吧!

readdir.php:
<?
###############################
# DB CONNECTION
# CHANGE THESE VALUES
###############################
$dbcnx = mysql_connect(“localhost”, “username”, “password”);
mysql_select_db(“base64imgdb”);

$path = “./”;
$dir_handle = opendir($path) or die(“Unable to open directory $path”);
while ($file = readdir($dir_handle)) {
$filetyp = substr($file, -3);
if ($filetyp == ‘gif’ OR $filetyp == ‘jpg’) {
$handle = fopen($file,’r’);
$file_content = fread($handle,filesize($file));
fclose($handle);
$encoded = chunk_split(base64_encode($file_content));
$sql = “INSERT INTO images SET sixfourdata=’$encoded'”;
mysql_query($sql);
}
}

closedir($dir_handle);
echo(“complete”);
mysql_close($dbcnx);
?>
image.php:
<?
$dbcnx = mysql_connect(“localhost”, “username”, “password”);

mysql_select_db(“base64imgdb”);

$img = $_REQUEST[“img”];

$result = mysql_query(“SELECT * FROM images WHERE imgid=” . $img . “”);

if (!$result) {

echo(“<b>Error performing query: ” . mysql_error() . “</b>”);
exit();
}
while ($row = mysql_fetch_array($result) ) {
$imgid = $row[“imgid”];
$encodeddata = $row[“sixfourdata”];
}
mysql_close($dbcnx);
echo base64_decode($encodeddata);
?>
And view.php (i shouldnt need to post this..)
<html>
<body>
..
<img src=’image.php?img=1′ border=”0″ alt=””>
..
</body>
</html>