Initial code commit

Author: mattjudge

dbquery.m

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+function data = dbquery( query )
+%DBQUERY returns results from database
+
+% THIS SHOULD ONLY BE USED ON A LOCAL MACHINE
+hostname='localhost:3306';               % hostname of the sql database
+username='root';                         % the database username
+password='';                             % the database password
+dbname='mydatabase';                     % the database name
+url='http://localhost/sql_to_json.php';  % url to the php script
+
+jsondata = webread(url,'hostname',hostname, ...
+    'username',username, ...
+    'password',password,'dbname',dbname, ...
+    'querystr',query);
+
+if jsondata{1} == 1  % check for success flag
+    data = jsondata{2};
+else
+    % relay errors encountered by php script to user
+    bEx = MException('DBQUERY:DatabaseError','Database error occured');
+    cEx = MException('DBQUERY:DatabaseErrorCause',jsondata{2});
+    throw(addCause(bEx, cEx))
+end    
+end

exampleuse.m

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+
+data = dbquery('SELECT * FROM `mytable`')
+
+plot([data.id])

sql_to_json.php

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+<?php
+
+$hostname = $_GET['hostname'];
+$username = $_GET['username'];
+$password = $_GET['password'];
+$querystr = $_GET['querystr'];
+$dbname   = $_GET['dbname'];
+
+// reference: https://phpdelusions.net/pdo
+
+// for development:
+ini_set('display_errors', 1);
+
+// set up PDO
+$dsn = "mysql:host=$hostname;dbname=$dbname;charset=utf8";
+$opt = [
+    PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,
+    PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
+    PDO::ATTR_EMULATE_PREPARES   => false,
+];
+
+$success = false;
+
+try {
+    $pdo = new PDO($dsn, $username, $password, $opt);
+	$data = $pdo->query($querystr)->fetchAll();
+	$success = true;
+} catch (PDOException $e) {
+    $data = $e->getMessage();
+}
+
+$data = [$success, $data];
+
+//echo '<pre>';
+//var_dump($data);
+
+// headers for not caching the results
+header('Cache-Control: no-cache, must-revalidate');
+header('Expires: Mon, 26 Jul 1997 05:00:00 GMT');
+
+// headers to indicate JSON result
+header('Content-type: application/json');
+
+// return RESTful json
+echo json_encode($data);