- Began WIP on SQL specific PdoObject

src/Adapter/SQLite.php

@@ -27,7 +27,7 @@ class SQLite implements AdapterInterface, MigrateInterface, SqlAdapterInterface
     public function connect() : PdoObject
     {
         try {
-            $pdo = new PdoObject($this->buildDataSourceName(), null, null);
+            $pdo = new PdoObject\SqlitePdoObject($this->buildDataSourceName(), null, null);
             $pdo->setAttribute(\PDO::ATTR_ERRMODE, \PDO::ERRMODE_EXCEPTION);
             $pdo->setAttribute(\PDO::ATTR_EMULATE_PREPARES, false);
             $pdo->setAttribute(\PDO::ATTR_DEFAULT_FETCH_MODE, \PDO::FETCH_ASSOC);
@@ -64,6 +64,7 @@ class SQLite implements AdapterInterface, MigrateInterface, SqlAdapterInterface
     public function escapeIdentifier(string $segment, int $type) : string 
     {
         switch($type) {
+            default:
             case static::IDENTIFIER_DATABASE:
             case static::IDENTIFIER_TABLE:
             case static::IDENTIFIER_FIELD:

src/Common/PdoObject/SqlPdoObject.php

@@ -0,0 +1,35 @@
+<?php
+
+namespace Ulmus\Common\PdoObject;
+
+class SqlPdoObject extends \Ulmus\Common\PdoObject
+{
+    protected int $openedTransaction = 0;
+
+    public function beginTransaction(): bool
+    {
+        if ( 0 === ++$this->openedTransaction ) {
+            return parent::beginTransaction();
+        }
+
+        return $this->exec('SAVEPOINT transaction_'.$this->openedTransaction) !== false;
+    }
+
+    public function commit() : bool
+    {
+        if ( 0 === --$this->openedTransaction) {
+            return parent::commit();
+        }
+
+        return false;
+    }
+
+    public function rollback() : bool
+    {
+        if (0 !== $this->openedTransaction) {
+            return $this->exec('ROLLBACK TO transaction_' . $this->openedTransaction--) !== false;
+        }
+
+        return parent::rollback();
+    }
+}

src/Common/PdoObject/SqlitePdoObject.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace Ulmus\Common\PdoObject;
+
+class SqlitePdoObject extends SqlPdoObject
+{
+    public function beginTransaction(): bool
+    {
+        if ( 0 === ++$this->openedTransaction ) {
+            return $this->beginImmediateTransaction();
+        }
+
+        return $this->exec('SAVEPOINT transaction_'.$this->openedTransaction) !== false;
+    }
+
+    protected function beginImmediateTransaction(): bool
+    {
+        return $this->exec("BEGIN IMMEDIATE TRANSACTION") !== false;
+    }
+}