Add Connection interface

src/Connection.php

@@ -0,0 +1,19 @@
+<?php declare(strict_types=1);
+
+namespace Amp\Sql;
+
+/**
+ * @template TResult of Result
+ * @template TStatement of Statement
+ * @template TTransaction of Transaction
+ * @template TConfig of SqlConfig
+ *
+ * @extends Link<TResult, TStatement, TTransaction>
+ */
+interface Connection extends Link
+{
+    /**
+     * @return TConfig The configuration used to create this connection.
+     */
+    public function getConfig(): SqlConfig;
+}

src/Pool.php

@@ -6,6 +6,7 @@
  * @template TResult of Result
  * @template TStatement of Statement
  * @template TTransaction of Transaction
+ * @template TConfig of SqlConfig
  *
  * @extends Link<TResult, TStatement, TTransaction>
  */
@@ -15,9 +16,9 @@ interface Pool extends Link
      * Gets a single connection from the pool to run a set of queries against a single connection.
      * Generally a transaction should be used instead of this method.
      *
-     * @return Link<TResult, TStatement, TTransaction>
+     * @return Connection<TResult, TStatement, TTransaction, TConfig>
      */
-    public function extractConnection(): Link;
+    public function extractConnection(): Connection;
 
     /**
      * @return int Total number of active connections in the pool.

src/SqlConnector.php

@@ -6,7 +6,7 @@
 
 /**
  * @template TConfig of SqlConfig
- * @template TLink of Link
+ * @template TConnection of Connection
  */
 interface SqlConnector
 {
@@ -16,9 +16,9 @@ interface SqlConnector
      *
      * @param TConfig $config
      *
-     * @return TLink
+     * @return TConnection
      *
      * @throws ConnectionException
      */
-    public function connect(SqlConfig $config, ?Cancellation $cancellation = null): Link;
+    public function connect(SqlConfig $config, ?Cancellation $cancellation = null): Connection;
 }