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chatAJAX.php
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chatAJAX.php
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<?php
define("CHATDB", "chat.db");
if (!file_exists(CHATDB)) {
try{
$db = new PDO('sqlite:'.CHATDB);
$sql ="
CREATE TABLE IF NOT EXISTS MESSAGES
(ID INTEGER PRIMARY KEY AUTOINCREMENT,
USER TEXT NOT NULL,
EMAIL TEXT NOT NULL,
MESSAGE TEXT NOT NULL,
TIME TIMESTAMP NOT NULL DEFAULT((julianday('now') - 2440587.5)*86400.0))";
$ret = $db->exec($sql);
sleep(0.5);
$ret = $db->exec('PRAGMA journal_mode = wal;');
sleep(0.5);
header("Refresh:0");
}
catch(PDOException $e){
die('Failed to execute query:'. $e->getMessage());
}
$db=null;
}elseif(file_exists(CHATDB)) {
try{
$db = new PDO('sqlite:'.CHATDB);
}
catch(PDOException $e){
die('Failed to connect:'. $e->getMessage());
}
}
//check to see if the ajax call was to update db
if (isset($_POST['text'])){
$msg=$_POST['text'];
$us=$_POST['user'];
$email=$_POST['email'];
$sql ="INSERT INTO MESSAGES (USER,MESSAGE,EMAIL) VALUES(?, ?, ?)";
try{
$ret = $db->prepare($sql);
$ret->execute([$us,$msg, $email]);
}
catch(PDOException $e){
console.log('Failed to update db:'. $e->getMessage());
}
}else{
//the script will run for 20 seconds after the initial ajax call
$time=time()+20;
while(time()<$time){
if ($_POST['time']){
$prevtime=$_POST['time'];
}
else {
$prevtime=0;
}
//query to see if there are new messages
$sql ="SELECT TIME,USER,MESSAGE,EMAIL FROM MESSAGES WHERE TIME>? ORDER BY TIME ASC";
try{
$ret = $db->prepare($sql);
$ret->execute([$prevtime]);
$resarr = $ret->fetchAll(PDO::FETCH_ASSOC);
//if there are no new messages in the db, sleep for half a second and then run loop again
if (!$resarr)
sleep(0.5);
else{
echo json_encode($resarr);
break;
}
}
catch(PDOException $e){
console.log('Failed to get messages:'. $e->getMessage());
}
}
}
$db=null;
?>