getData.php.EXAMPLE

<?php
header('Expires: Thu, 01-Jan-70 00:00:01 GMT');
header('Last-Modified: ' . gmdate('D, d M Y H:i:s') . ' GMT');
header('Cache-Control: no-store, no-cache, must-revalidate');
header('Cache-Control: post-check=0, pre-check=0', false);
header('Pragma: no-cache');

$dsn = "mysql:host=localhost;dbname=db_name;charset=utf8";
$username = "username"; // I made this user read only so need for password
$pdo = new PDO($dsn, $username);

$rows = array();
if(isset($_GET['Residues'])) {
    $query = "SELECT * FROM " . $_GET['Residues'];
	$stmt = $pdo->query($query);
	$rows = $stmt->fetchAll(PDO::FETCH_ASSOC);
} else if(isset($_GET['SpeciesTable'])) {
	$stmt = $pdo->prepare("SELECT * FROM SpeciesTables WHERE SS_Table = ?");
	$stmt->execute(array($_GET['SpeciesTable']));
	$rows = $stmt->fetchAll(PDO::FETCH_ASSOC);
} else if(isset($_GET['FetchMapList'])){
	$query = "SELECT Species_Name, Species_Abr, Subunit,DataSetName, MapType, SS_Table FROM SpeciesTables";
	$stmt = $pdo->query($query);
	$rows = $stmt->fetchAll(PDO::FETCH_ASSOC);
} else if(isset($_GET['TextLabels'])) {
    $query = "SELECT * FROM " . $_GET['TextLabels'];
	$stmt = $pdo->query($query);
	$rows = $stmt->fetchAll(PDO::FETCH_ASSOC);
} else if(isset($_GET['LineLabels'])) {
    $query = "SELECT * FROM " . $_GET['LineLabels'];
	$stmt = $pdo->query($query);
	$rows = $stmt->fetchAll(PDO::FETCH_ASSOC);
} else if(isset($_GET['BasePairs'])) {
    $query = "SELECT * FROM " . $_GET['BasePairs'];
	$stmt = $pdo->query($query);
	$rows = $stmt->fetchAll(PDO::FETCH_ASSOC);
} else if(isset($_GET['FullTable'])) {
    $query = "SELECT * FROM " . $_GET['FullTable'];
	$stmt = $pdo->query($query);
	$rows = $stmt->fetchAll(PDO::FETCH_ASSOC);
} else if(isset($_GET['ProtBasePairs'])) {
    $query = "SELECT * FROM " . $_GET['ProtBasePairs'];
	$stmt = $pdo->prepare($query . " WHERE ProteinName = ?");
	$stmt->execute(array($_GET['ProtChain']));
	$rows = $stmt->fetchAll(PDO::FETCH_ASSOC);
}
echo json_encode($rows);
?>