1 files changed, 80 insertions, 0 deletions
diff --git a/localwebsite/engine/database.php b/localwebsite/engine/database.php
new file mode 100644
index 0000000..186d2ef
--- /dev/null
+++ b/localwebsite/engine/database.php
@@ -0,0 +1,80 @@
+<?php
+
+class database {
+
+    const SCHEMA_VERSION = 2;
+
+    protected SQLite3 $link;
+
+    public function __construct(string $db_path) {
+        $this->link = new SQLite3($db_path);
+        $this->link->enableExceptions(true);
+        $this->upgradeSchema();
+    }
+
+    protected function upgradeSchema() {
+        $cur = $this->getSchemaVersion();
+        if ($cur < 1) {
+            $this->link->exec("CREATE TABLE users (
+                id INTEGER PRIMARY KEY AUTOINCREMENT,
+                username TEXT,
+                password TEXT
+            )");
+        }
+        if ($cur < 2) {
+            $this->link->exec("CREATE TABLE vk_processed (
+                last_message_time INTEGER
+            )");
+            $this->link->exec("INSERT INTO vk_processed (last_message_time) VALUES (0)");
+        }
+        $this->syncSchemaVersion();
+    }
+
+    protected function getSchemaVersion() {
+        return $this->link->query("PRAGMA user_version")->fetchArray()[0];
+    }
+
+    protected function syncSchemaVersion() {
+        $this->link->exec("PRAGMA user_version=".self::SCHEMA_VERSION);
+    }
+
+    protected function prepareQuery(string $sql): string {
+        if (func_num_args() > 1) {
+            $mark_count = substr_count($sql, '?');
+            $positions = array();
+            $last_pos = -1;
+            for ($i = 0; $i < $mark_count; $i++) {
+                $last_pos = strpos($sql, '?', $last_pos + 1);
+                $positions[] = $last_pos;
+            }
+            for ($i = $mark_count - 1; $i >= 0; $i--) {
+                $arg_val = func_get_arg($i + 1);
+                if (is_null($arg_val)) {
+                    $v = 'NULL';
+                } else {
+                    $v = '\''.$this->link->escapeString($arg_val) . '\'';
+                }
+                $sql = substr_replace($sql, $v, $positions[$i], 1);
+            }
+        }
+
+        return $sql;
+    }
+
+    public function query(string $sql, ...$params): SQLite3Result {
+        return $this->link->query($this->prepareQuery($sql, ...$params));
+    }
+
+    public function exec(string $sql, ...$params) {
+        return $this->link->exec($this->prepareQuery($sql, ...$params));
+    }
+
+    public function querySingle(string $sql, ...$params) {
+        return $this->link->querySingle($this->prepareQuery($sql, ...$params));
+    }
+
+    public function querySingleRow(string $sql, ...$params) {
+        return $this->link->querySingle($this->prepareQuery($sql, ...$params), true);
+    }
+
+}
+\ No newline at end of file