fix db name attribute (#275)

Author: weslenteche

examples/instrumentation/Wordpress/composer.json

@@ -4,9 +4,9 @@
     "type": "project",
     "minimum-stability": "beta",
     "require": {
-        "open-telemetry/opentelemetry-auto-wordpress": "^0.0.5",
-        "open-telemetry/sdk": "^1.0@beta",
-        "open-telemetry/exporter-otlp": "^1.0@beta",
+        "open-telemetry/opentelemetry-auto-wordpress": "^0.0.15",
+        "open-telemetry/sdk": "^1.0",
+        "open-telemetry/exporter-otlp": "^1.0",
         "php-http/guzzle7-adapter": "^1.0"
     },
     "config": {

src/Instrumentation/Wordpress/src/WordpressInstrumentation.php

@@ -49,7 +49,7 @@ function: '__construct',
             pre: static function ($object, ?array $params, ?string $class, ?string $function, ?string $filename, ?int $lineno) use ($instrumentation) {
                 $span = self::builder($instrumentation, 'wpdb.__connect', $function, $class, $filename, $lineno)
                     ->setAttribute(TraceAttributes::DB_USER, $params[0] ?? 'unknown')
-                    ->setAttribute(TraceAttributes::DB_NAME, $params[1] ?? 'unknown')
+                    ->setAttribute(TraceAttributes::DB_NAME, $params[2] ?? 'unknown')
                     ->setAttribute(TraceAttributes::DB_SYSTEM, 'mysql')
                     ->startSpan();
                 Context::storage()->attach($span->storeInContext(Context::getCurrent()));