You want users to be able to enter a table name and then see the content of the table. How do you create a webpage with a text field and a submit button that will display the content of the table if it exists?
This assumes you have the LAPP stack set up on a single server. To set up the LAPP stack on Ubuntu, run this command without quotes: "sudo apt-get -y install php5 apache2-bin postgresql postgresql-contrib php-pgsql"
This example below challenges the users for Postgres credentials via the web page. You could hard code a username and password in the viewer1.php page. You could also leave out the fields for a username and password in the first web page (login1.php). Then the web page would allow for anonymous users to browse to the site and enter a table name. The database is hard-coded in viewer1.php, but you could change these two files to work with a database that the user enters.
Warning: This is not secure against SQL injection. This is for informational purposes only. This could be done in a secure, development environment or laboratory.
1. In /var/www/html/ create a file named login1.php. Have this be the contents:
<h2> Want to see a table? Enter your credentials and the table name.</h2>
<form action="viewer1.php" method="post">
UserName: <input type="text" name="username"><br>
Password: <input type="password" name="password"><br>
TableToView: <input type="text" name="table"<br>
2. In /var/www/html/ create a file named viewer1.php. Replace "circle" below, but otherwise use the following as the contents:
$part1 = $_POST["username"];
$part2 = $_POST["password"];
$part3 = $_POST["table"];
$comp = 'user='.$part1.' password='.$part2 ;
$host = "host=127.0.0.1";
$port = "port=5432";
$dbname = "dbname=circle";
$credentials = $comp;
$db = pg_connect( "$host $port $dbname $credentials" );
$query = 'select * from ' . $part3 . ';';
$cc = pg_query($query);
/* This code below was copied from http://razorsql.com/articles/postgresql_column_names_values.html It was modified somewhat.*/
$i = 0;
while ($i < pg_num_fields($cc))
$fieldName = pg_field_name($cc, $i);
echo '<td>' . $fieldName . '</td>';
$i = $i + 1;
$i = 0;
while ($row = pg_fetch_row($cc))
$count = count($row);
$y = 0;
while ($y < $count)
$c_row = current($row);
echo '<td>' . $c_row . '</td>';
$y = $y + 1;
$i = $i + 1;
3. Go to a web browser. Go to http://x.x.x.x/login1.php. Enter the credentials and the table name of the database you want to see.