Add mode, bring in definition/patch queries

src/Configuration.php

@@ -24,6 +24,9 @@ class Configuration
     /** @var array|null Options to use for connections (driver-specific) */
     public static ?array $options = null;
 
+    /** @var Mode|null The mode in which the library is operating (filled after first connection if not configured) */
+    public static ?Mode $mode = null;
+
     /**
      * Retrieve a new connection to the database
      *
@@ -38,8 +41,15 @@ class Configuration
         $db = new PDO(self::$pdoDSN, $_ENV['PDO_DOC_USERNAME'] ?? self::$username,
             $_ENV['PDO_DOC_PASSWORD'] ?? self::$password, self::$options);
 
-        // TODO: determine driver, set mode for other queries
-        echo $db->getAttribute(PDO::ATTR_DRIVER_NAME);
+        if (is_null(self::$mode)) {
+            $driver = $db->getAttribute(PDO::ATTR_DRIVER_NAME);
+            self::$mode = match ($driver) {
+                'pgsql'  => Mode::PgSQL,
+                'sqlite' => Mode::SQLite,
+                default  => throw new DocumentException(
+                    "Unsupported driver $driver: this library currently supports PostgreSQL and SQLite")
+            };
+        }
         return $db;
     }
 }