Implement proper SQL error handling

And automatically create database if it does not exist.

index.php

@@ -7,20 +7,40 @@ if ($path == "/admin") {
 }
 
 
-$db = new SQLite3(".links.db", SQLITE3_OPEN_READWRITE);
+$error = false;
-$stmt = $db->prepare("SELECT * FROM links WHERE path = :path;");
+$target = null;
-$stmt->bindValue(":path", $path);
+try {
-$result = $stmt->execute()->fetchArray(SQLITE3_ASSOC);
+    // Connect
+    if (!file_exists(".links.db")) {
+        $db = new SQLite3(".links.db");
+        $db->query(file_get_contents("links.sql"));
+    } else {
+        $db = new SQLite3(".links.db", SQLITE3_OPEN_READWRITE);
+    }
+    $db->enableExceptions(true);
 
-if ($result) {
+    // Get path
-    $stmt = $db->prepare("UPDATE links SET visits = visits + 1, last_visit = CURRENT_TIMESTAMP WHERE path = :path;");
+    $stmt = $db->prepare("SELECT * FROM links WHERE path = :path;");
     $stmt->bindValue(":path", $path);
-    $stmt->execute();
+    if ($result = $stmt->execute()->fetchArray(SQLITE3_ASSOC))
-}
+        $target = $result["target"];
-$db->close();
 
-if ($result) {
+    // Update count
-    $target = $result["target"];
+    if ($target != null) {
+        $stmt = $db->prepare("UPDATE links SET visits = visits + 1, last_visit = CURRENT_TIMESTAMP 
+                              WHERE path = :path;");
+        $stmt->bindValue(":path", $path);
+        $stmt->execute();
+    }
+
+    // Close
+    $db->close();
+} catch (Exception $exception) {
+    $error = true;
+}
+
+
+if ($target != null) {
     header("Location: {$target}");
     exit();
 }
@@ -58,7 +78,13 @@ if ($result) {
 <div id="wrapper">
     <h1><a href="https://fwdekker.com/">FWDekker</a></h1>
     <?php
-    if ($path != "/") {
+    if ($error) {
+        ?>
+        <b>Internal server error</b><br /><br />
+        Something went wrong internally, and you could not be redirected. Please try again later.<br /><br />
+        <br /><br />
+        <?php
+    } else if ($path != "/") {
         ?>
         <b>Link not found</b><br /><br />
         The short URL https://fwdkr.co<?= $path ?> could not be found.<br /><br />

links.sql

@@ -0,0 +1,12 @@
+create table links
+(
+    path       text not null
+        constraint links_pk
+            primary key,
+    target     text not null,
+    visits     int default 0 not null,
+    last_visit text
+);
+
+create unique index links_path_uindex
+    on links (path);