存储和显示来自数据库的图像文件
Storing and display image files drom db
我创建了一个简单的添加产品表单，它看起来是这样的：
<form id="loginForm" name="loginForm" method="post" enctype="multipart/form-data" action="ads_include/ads_v1_normal_priori.php">
<label class="control-label" for="input01">Naziv oglasa</label>
<div class="controls">
<input type="text" name="naziv" id="naziv" class="form-control">
</div>
<label class="control-label">Opis oglasa</label>
<div class="controls">
<div class="textarea">
<textarea type="" name="opis" id="opis" class="form-control" rows="5"></textarea>
</div>
</div>
<label class="control-label">Slika oglasa</label>
<div class="controls">
<input type="file" name="image" class="form-control">
</div>
<label class="control-label" for="input02">Kategorija oglasa</label>
<div class="controls">
<input type="text" name="kategorija" id="kategorija" class="form-control">
</div>
<label class="control-label" for="input03">Kontakt telefon</label>
<div class="controls">
<input type="text" name="tel" id="tel" class="form-control">
</div>
<label class="control-label" for="input04">Adresa (1)</label>
<div class="controls">
<input type="text" name="adresa" id="adresa" class="form-control">
</div>
<label class="control-label" for="input05">Adresa (2)</label>
<div class="controls">
<input type="text" name="adresa2" id="adresa2" class="form-control">
</div>
<label class="control-label" for="input06">Adresa (3)</label>
<div class="controls">
<input type="text" name="adresa3" id="adresa3" class="form-control">
</div>
<label class="control-label" for="input07">Drzava</label>
<div class="controls">
<input type="text" name="drzava" id="drzava" class="form-control">
</div>
<label class="control-label" for="input08">Grad</label>
<div class="controls">
<input type="text" name="grad" id="grad" class="form-control">
</div>
<label class="control-label" for="input09">Mesto</label>
<div class="controls">
<input type="text" name="mesto" id="mesto" class="form-control">
</div>
<label class="control-label" for="input10">Datum reg. oglasa</label>
<div class="controls">
<input type="text" name="datumPostavljana" id="datumPostavljana" class="form-control">
</div>
<label class="control-label" for="input11">Datum odj.oglasa</label>
<div class="controls">
<input type="text" name="datumBrisanja" id="datumBrisanja" class="form-control">
</div><br/>
<div class="controls">
<input type="submit" value="Dodaj oglas" class="btn btn-success">
<input type="submit" value="Obriši" class="btn btn-default">
</div>
</form>
这是将数据存储到数据库中的文件：
<?php
//Start session
session_start();
//Include database connection details
require_once('config.php');
//Array to store validation errors
$errmsg_arr = array();
//Validation error flag
$errflag = false;
//Connect to mysql server
$link = mysql_connect(DB_HOST, DB_USER, DB_PASSWORD);
if(!$link) {
die('Failed to connect to server: ' . mysql_error());
}
//Select database
$db = mysql_select_db(DB_DATABASE);
if(!$db) {
die("Unable to select database");
}
//Function to sanitize values received from the form. Prevents SQL injection
function clean($str) {
$str = @trim($str);
if(get_magic_quotes_gpc()) {
$str = stripslashes($str);
}
return mysql_real_escape_string($str);
}
//Sanitize the POST values
$naziv = clean($_POST['naziv']);
$opis = clean($_POST['opis']);
$kategorija = clean($_POST['kategorija']);
$tel = clean($_POST['tel']);
$adresa = clean($_POST['adresa']);
$drzava = clean($_POST['drzava']);
$grad = clean($_POST['grad']);
$mesto = clean($_POST['mesto']);
$datumPostavljana = clean($_POST['datumPostavljana']);
$datumBrisanja = clean($_POST['datumBrisanja']);
//Input Validations
if($naziv == '') {
$errmsg_arr[] = 'Naziv missing';
$errflag = true;
}
if($opis == '') {
$errmsg_arr[] = 'Opis missing';
$errflag = true;
}
if($kategorija == '') {
$errmsg_arr[] = 'Kategorija missing';
$errflag = true;
}
if($tel == '') {
$errmsg_arr[] = 'Telefon missing';
$errflag = true;
}
if($adresa == '') {
$errmsg_arr[] = 'Adresa missing';
$errflag = true;
}
if($drzava == '') {
$errmsg_arr[] = 'Drzava missing';
$errflag = true;
}
if($grad == '') {
$errmsg_arr[] = 'Grad missing';
$errflag = true;
}
if($mesto == '') {
$errmsg_arr[] = 'Mesto missing';
$errflag = true;
}
if($datumPostavljana == '') {
$errmsg_arr[] = 'Datum postavljanja missing';
$errflag = true;
}
if($datumBrisanja == '') {
$errmsg_arr[] = 'Datum isteka missing';
$errflag = true;
}
//Check for duplicate login ID
if($login != '') {
$qry = "SELECT * FROM oglas WHERE link='$naziv'";
$result = mysql_query($qry);
if($result) {
if(mysql_num_rows($result) > 0) {
$errmsg_arr[] = 'Naziv already in use';
$errflag = true;
}
@mysql_free_result($result);
}
else {
die("Query failed");
}
}
//If there are input validations, redirect back to the registration form
if($errflag) {
$_SESSION['ERRMSG_ARR'] = $errmsg_arr;
session_write_close();
header("location: ../add_ads_normal.php");
exit();
}
//Create INSERT query
$qry = "INSERT INTO oglas (naziv, opis, kategorija, tel, adresa, adresa2, adresa3, drzava, grad, mesto, datumPostavljana, datumBrisanja)
VALUES('$naziv','$opis','$kategorija','$tel','$adresa','$adresa2','$adresa3','$drzava','$grad','$mesto','$datumPostavljana','$datumBrisanja')";
$result = @mysql_query($qry);
//Check whether the query was successful or not
if($result) {
header("location: ../add_ads_normal.php?successfull_add_1_row_in_oglas_v1");
exit();
}else {
die("Query failed");
}
?>
我的问题是：如何将图像存储在数据库中并显示出来？我需要在第二页上使用什么代码才能使其正常工作？
首先，您需要一个 HTML 表单来处理文件上传。这意味着表单需要有一个 enctype="multipart/form-data" 属性，我看到你有。
接下来，在您的接收 PHP 脚本中，此信息将在 $_FILES 全局变量中。如果您的 <input type="file"> 有 name="myfile"，则此上传文件的 meta-information 将在 $_FILES['myfile'] 中。如果您使用 var_dump 检查它，您将在 tmp_name 条目中看到上传文件的位置。
（有关上述内容的更多信息，Google for "PHP file upload"。）
接下来，您可以使用 PHP 的 file_get_contents function to read the contents of that file, and store it in your database. I would transform it into some ASCII-safe string first, using base64_encode，然后再将其放入 SQL 查询中。
您还应该将文件的 file-type 存储在数据库中，这样您就知道需要从 PHP 输出中发送哪种 header 来告诉浏览器 file-type。这个 file-type 可以使用 FileInfo extension 检测到，您可以使用 PECL 安装它。
一旦您将所有数据存储在数据库中，然后检索它并将其输出到浏览器，这就是获取 file-type、内容 base64_decode 的问题，设置正确的 headers（不要忘记 Content-Length header），然后 echo-ing 字节。
我创建了一个简单的添加产品表单，它看起来是这样的：
<form id="loginForm" name="loginForm" method="post" enctype="multipart/form-data" action="ads_include/ads_v1_normal_priori.php">
<label class="control-label" for="input01">Naziv oglasa</label>
<div class="controls">
<input type="text" name="naziv" id="naziv" class="form-control">
</div>
<label class="control-label">Opis oglasa</label>
<div class="controls">
<div class="textarea">
<textarea type="" name="opis" id="opis" class="form-control" rows="5"></textarea>
</div>
</div>
<label class="control-label">Slika oglasa</label>
<div class="controls">
<input type="file" name="image" class="form-control">
</div>
<label class="control-label" for="input02">Kategorija oglasa</label>
<div class="controls">
<input type="text" name="kategorija" id="kategorija" class="form-control">
</div>
<label class="control-label" for="input03">Kontakt telefon</label>
<div class="controls">
<input type="text" name="tel" id="tel" class="form-control">
</div>
<label class="control-label" for="input04">Adresa (1)</label>
<div class="controls">
<input type="text" name="adresa" id="adresa" class="form-control">
</div>
<label class="control-label" for="input05">Adresa (2)</label>
<div class="controls">
<input type="text" name="adresa2" id="adresa2" class="form-control">
</div>
<label class="control-label" for="input06">Adresa (3)</label>
<div class="controls">
<input type="text" name="adresa3" id="adresa3" class="form-control">
</div>
<label class="control-label" for="input07">Drzava</label>
<div class="controls">
<input type="text" name="drzava" id="drzava" class="form-control">
</div>
<label class="control-label" for="input08">Grad</label>
<div class="controls">
<input type="text" name="grad" id="grad" class="form-control">
</div>
<label class="control-label" for="input09">Mesto</label>
<div class="controls">
<input type="text" name="mesto" id="mesto" class="form-control">
</div>
<label class="control-label" for="input10">Datum reg. oglasa</label>
<div class="controls">
<input type="text" name="datumPostavljana" id="datumPostavljana" class="form-control">
</div>
<label class="control-label" for="input11">Datum odj.oglasa</label>
<div class="controls">
<input type="text" name="datumBrisanja" id="datumBrisanja" class="form-control">
</div><br/>
<div class="controls">
<input type="submit" value="Dodaj oglas" class="btn btn-success">
<input type="submit" value="Obriši" class="btn btn-default">
</div>
</form>
这是将数据存储到数据库中的文件：
<?php
//Start session
session_start();
//Include database connection details
require_once('config.php');
//Array to store validation errors
$errmsg_arr = array();
//Validation error flag
$errflag = false;
//Connect to mysql server
$link = mysql_connect(DB_HOST, DB_USER, DB_PASSWORD);
if(!$link) {
die('Failed to connect to server: ' . mysql_error());
}
//Select database
$db = mysql_select_db(DB_DATABASE);
if(!$db) {
die("Unable to select database");
}
//Function to sanitize values received from the form. Prevents SQL injection
function clean($str) {
$str = @trim($str);
if(get_magic_quotes_gpc()) {
$str = stripslashes($str);
}
return mysql_real_escape_string($str);
}
//Sanitize the POST values
$naziv = clean($_POST['naziv']);
$opis = clean($_POST['opis']);
$kategorija = clean($_POST['kategorija']);
$tel = clean($_POST['tel']);
$adresa = clean($_POST['adresa']);
$drzava = clean($_POST['drzava']);
$grad = clean($_POST['grad']);
$mesto = clean($_POST['mesto']);
$datumPostavljana = clean($_POST['datumPostavljana']);
$datumBrisanja = clean($_POST['datumBrisanja']);
//Input Validations
if($naziv == '') {
$errmsg_arr[] = 'Naziv missing';
$errflag = true;
}
if($opis == '') {
$errmsg_arr[] = 'Opis missing';
$errflag = true;
}
if($kategorija == '') {
$errmsg_arr[] = 'Kategorija missing';
$errflag = true;
}
if($tel == '') {
$errmsg_arr[] = 'Telefon missing';
$errflag = true;
}
if($adresa == '') {
$errmsg_arr[] = 'Adresa missing';
$errflag = true;
}
if($drzava == '') {
$errmsg_arr[] = 'Drzava missing';
$errflag = true;
}
if($grad == '') {
$errmsg_arr[] = 'Grad missing';
$errflag = true;
}
if($mesto == '') {
$errmsg_arr[] = 'Mesto missing';
$errflag = true;
}
if($datumPostavljana == '') {
$errmsg_arr[] = 'Datum postavljanja missing';
$errflag = true;
}
if($datumBrisanja == '') {
$errmsg_arr[] = 'Datum isteka missing';
$errflag = true;
}
//Check for duplicate login ID
if($login != '') {
$qry = "SELECT * FROM oglas WHERE link='$naziv'";
$result = mysql_query($qry);
if($result) {
if(mysql_num_rows($result) > 0) {
$errmsg_arr[] = 'Naziv already in use';
$errflag = true;
}
@mysql_free_result($result);
}
else {
die("Query failed");
}
}
//If there are input validations, redirect back to the registration form
if($errflag) {
$_SESSION['ERRMSG_ARR'] = $errmsg_arr;
session_write_close();
header("location: ../add_ads_normal.php");
exit();
}
//Create INSERT query
$qry = "INSERT INTO oglas (naziv, opis, kategorija, tel, adresa, adresa2, adresa3, drzava, grad, mesto, datumPostavljana, datumBrisanja)
VALUES('$naziv','$opis','$kategorija','$tel','$adresa','$adresa2','$adresa3','$drzava','$grad','$mesto','$datumPostavljana','$datumBrisanja')";
$result = @mysql_query($qry);
//Check whether the query was successful or not
if($result) {
header("location: ../add_ads_normal.php?successfull_add_1_row_in_oglas_v1");
exit();
}else {
die("Query failed");
}
?>
我的问题是：如何将图像存储在数据库中并显示出来？我需要在第二页上使用什么代码才能使其正常工作？
首先，您需要一个 HTML 表单来处理文件上传。这意味着表单需要有一个 enctype="multipart/form-data" 属性，我看到你有。
接下来，在您的接收 PHP 脚本中，此信息将在 $_FILES 全局变量中。如果您的 <input type="file"> 有 name="myfile"，则此上传文件的 meta-information 将在 $_FILES['myfile'] 中。如果您使用 var_dump 检查它，您将在 tmp_name 条目中看到上传文件的位置。
（有关上述内容的更多信息，Google for "PHP file upload"。）
接下来，您可以使用 PHP 的 file_get_contents function to read the contents of that file, and store it in your database. I would transform it into some ASCII-safe string first, using base64_encode，然后再将其放入 SQL 查询中。
您还应该将文件的 file-type 存储在数据库中，这样您就知道需要从 PHP 输出中发送哪种 header 来告诉浏览器 file-type。这个 file-type 可以使用 FileInfo extension 检测到，您可以使用 PECL 安装它。
一旦您将所有数据存储在数据库中，然后检索它并将其输出到浏览器，这就是获取 file-type、内容 base64_decode 的问题，设置正确的 headers（不要忘记 Content-Length header），然后 echo-ing 字节。