Accessing database and display registered users through PHP
I have a members.php page/file in which i want logged in users to see the other users registered in the database. I'm not exactly quite sure how to do this and I'm struggling quite a while now with this so your help will be VERY much appreciated.
I will include connect.php, members.php and my database.sql
Here is my connect.php file
<?php
session_start();
//connect.php
$server = 'localhost';
$username = 'root';
$password = '';
$database = 'mydatabase';
if(!mysql_connect('localhost', 'root', ''))
{
exit('Error: could not establish database connection');
}
if(!mysql_select_db($database))
{
exit('Error: could not select the database');
}
?>
Here is my members.php file
<!DOCTYPE HTML>
<head>
<title> ShareLink </title>
<link rel="stylesheet" href="style.css" type="text/css">
</head>
<body>
<div id="wrapper">
<?php
//create_cat.php
include 'connect.php';
include 'header.php';
if(isset($_SESSION['signed_in']) == FALSE || isset($_SESSION['user_level']) != 1 )
{
//the user IS NOT an admin
echo '<br/>';
echo 'Sorry! You have to be <a href="/signin.php"><b>logged in</b></a> to view all the <a href="signup.php" title="Become a registered user!"><b>registered</b></a> members.';
echo '<br/><br/>';
}
ELSE
{
echo '<h2>Registered users:</h2>';
$sql = "SELECT user_name FROM users";
//NOW I WANT TO DISPLAY ALL THE REGISTERED USERS
//MUST I ECHO SOMETHING HERE?
/////////////////////////////////////////////////////////
/////////////// WHAT CODE MUST COME HERE? //////////////
/////////////// AND IS IT SQL OR PHP CODE? //////////////
/////////////////////////////////////////////////////////
}
include 'footer.php';
?>
</div>
Here is my database.sql file
CREATE TABLE users (
user_id INT(8) NOT NULL AUTO_INCREMENT,
user_name VARCHAR(30) NOT NULL,
user_pass VARCHAR(255) NOT NULL,
user_email VARCHAR(255) NOT NULL,
user_date DATETIME NOT NULL,
user_level INT(8) NOT NULL,
UNIQUE INDEX user_name_unique (user_name),
PRIMARY KEY (user_id)
);
CREATE TABLE categories (
cat_id INT(8) NOT NULL AUTO_INCREMENT,
cat_name VARCHAR(255) NOT NULL,
cat_description VARCHAR(255) NOT NULL,
UNIQUE INDEX cat_name_unique (cat_name),
PRIMARY KEY (cat_id)
);
CREATE TABLE topics (
topic_id INT(开发者_如何学C8) NOT NULL AUTO_INCREMENT,
topic_subject VARCHAR(255) NOT NULL,
topic_date DATETIME NOT NULL,
topic_cat INT(8) NOT NULL,
topic_by INT(8) NOT NULL,
PRIMARY KEY (topic_id)
);
CREATE TABLE posts (
post_id INT(8) NOT NULL AUTO_INCREMENT,
post_content TEXT NOT NULL,
post_date DATETIME NOT NULL,
post_topic INT(8) NOT NULL,
post_by INT(8) NOT NULL,
PRIMARY KEY (post_id)
);
echo '<h2>Registered users:</h2>';
$sql = "SELECT `user_name`
FROM `users`
ORDER BY `user_name` ASC";
$result = mysql_query($sql);
while($user = mysql_fetch_array($result))
echo $user['user_name'].'<br/>';
First you need to execute the query (mysql_query) and store it in a result. Then you have to fetch the result as an array with mysql_fetch_array within a while loop and echo the user_name of each user.
EDIT: As Damien Pirsy pointed out in his comment, it seems like user_level needs to be equal to 1 for a user to be considered as registered. If that's the case change $sql to this:
$sql = "SELECT `user_name`
FROM `users`
WHERE `user_level` = 1
ORDER BY `user_name` ASC";
For your add to friend question, you could do something like this:
while($user = mysql_fetch_array($result))
echo $user['user_name'].'
<a href="addfriend.php?user='.$user['id'].'">ADD TO FRIENDS</a><br/>';
And then on addfriend.php you would have some code that uses $_GET['id'] to add this person to friends.
At its most basic:
<?php
echo '<h2>Registered users:</h2>';
$sql = "SELECT user_name FROM users";
// run the query. Will return a resource or false
$result = mysql_query($sql);
// if it ran OK
if ($result) {
// while I have more results, loop through them
// returning each result as an array
while ($user = mysql_fetch_array($result)) {
// use the array keys (column names) to output the data
echo $user['user_name'], '<br />';
}
}
加载中,请稍侯......
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