Application to look after generalise casual queries on a complex table structure

PHP and MySQL example application - adhoc database analysis example from a Well House Consultants training course
More on PHP and MySQL example application - adhoc database analysis [link]

Source code: adhoc_sql_query_engine.php Module: H204

<?php

# Settings that may be changed between installations

$include_from = "$_SERVER[DOCUMENT_ROOT]/../demoprivate"; # Typical production
$include_from = "."; # for testing - in CURRENT directory
$dbsource = "localhost";
$dbuser = "trainee";
$dbpass = "abc123";
$dbname = "forsale";

# END of settings that may vary from one installation to another

require_once ("$include_from/webhelpers.inc");
require_once ("$include_from/businesslogic.inc");

# Top level application code

$_warnings = array();
session_start();

// Set up for a newcomer or someone following a link or typing a URL

if (! $_SESSION[current] or $_SERVER[REQUEST_METHOD] == "GET") {
        $current = 0;
        read_config("$include_from/adhoc.conf");
} else {
        $current = $_SESSION[current];
}

$fill[date] = date("r");
$fill[basetext] = "SQL Ad-hoc Query System";
if ($_SESSION[config]["basetext:"][0]) (
        $fill[basetext] = $_SESSION[config]["basetext:"][0]) ;

######################### Handler responses from previous form

$error = 0;
switch ($current) {

case 0: // Finish up from initialisation
        $current = 1;
        break;

case 1: // Has the user entered a valid login code?
        $role = validate_login();
        if (! $error) {
                $current = 10;
                if ($role == "admin") $current = 101;
                store_login();
                }
        break;

case 10: // Finish up from choosing base query
        $tuneit = validate_base();
        if (! $error) {
                $current = 11;
                if ($tuneit == 0) $current = 20;
                store_base();
                }
        break;

case 11: // Finish up from record selection (WHERE clauses)
        validate_rows();
        if (! $error) {
                $current = 12; # For full app, move to columns
                store_rows();
                }
        break;

case 12: // Finish up from field selection (which columns)
        validate_cols();
        if (! $error) {
                $current = 13;
                $current = 20; # for testing, go to do the jobbie!
                store_cols();
                }
        break;

case 13: // Finish up from grouping
        validate_groups();
        if (! $error) {
                $current = 20;
                store_groups();
                }
        break;

case 20: // Finish up from results
        $whatnext = validate_results();
        if (! $error) {
                if ($whatnext == "next") $current = 20;
                if ($whatnext == "previous") $current = 20;
                if ($whatnext == "all") $current = 20;
                if ($whatnext == "tune") $current = 11;
                if ($whatnext == "new") $current = 10;
                if ($whatnext == "logout") $current = 199;
                store_results();
                }
        break;

default:
        print "Looking to complete page '$current'. Not yet implemented.";
        break;
}

# activity_log();
$_SESSION[current] = $current;
$fill[current] = $current;
$fill[alert] = "";
$fill[user] = $_SESSION[user];

######################### Prepare for next form

switch ($current) {

case 1: // prepare for login
        $fill[form] = makeform_login();
        $fill[instruct] = "Please login or select <a href=/>here</a>".
                " if you are not an authorised user";
        $fill[result] = "-";
        $fill[user] = "[not logged in]";
        break;

case 10: // select base query
        $fill[form] = makeform_basequery();
        $fill[instruct] = "Please choose a base or archive query or NEW";
        $fill[result] = "-";
        break;

case 11: // select rows
        $fill[form] = makeform_rows();
        $fill[instruct] = "Please select which rows are required";
        $fill[result] = "-";
        break;

case 12: // select columns
        $fill[form] = makeform_cols();
        $fill[instruct] = "Please select which fields to be displayed";
        $fill[result] = "-";
        break;

case 13: // select grouping
        $fill[form] = makeform_grouping();
        $fill[instruct] = "Please select how rows are to be grouped";
        $fill[result] = "-";
        break;

case 20: // Generate Result
        $fill[form] = makeform_result();
        $fill[instruct] = "What do you want to do now?";
        $fill[result] = run_query();
        break;

case 199:
        $fill[form] = "";
        $fill[instruct] = "Have a nice day!<br>";
        $fill[result] = "You may <a href=$PHP_SELF>log in again</a> or ";
        $fill[result] .= "<a href=/>go to home page</a><br>";
        $fill[user] = "[not logged in]";
        session_destroy();
        break;

default:
        print "Oh dear - failed to prepare for '$current'!";
        break;
}
######################### Send response

$fill[errmsg] = $error ? "Error - please correct as indicated" : "";

$html = generate_output("$include_from/page_layout.htp",$fill);
print $html;
?>

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