Added DataMapper::lastError() method.

Author: muhammetsafak

src/DataMapper/DataMapper.php

@@ -121,6 +121,25 @@ public function lastSQL(): string
         return $this->last_sql;
     }
 
+    /**
+     * @inheritDoc
+     */
+    public function lastError(): ?string
+    {
+        if(!isset($this->statement)){
+            return null;
+        }
+        $errorCode = $this->statement->errorCode();
+        if($errorCode === null || empty(\trim($errorCode, "0 \t\n\r\0\x0B"))){
+            return null;
+        }
+        $errorInfo = $this->statement->errorInfo();
+        if(!isset($errorInfo[2])){
+            return null;
+        }
+        return $errorCode . ' - ' . $errorInfo[2];
+    }
+
     /**
      * @inheritDoc
      */

src/DataMapper/DataMapperInterface.php

@@ -32,6 +32,11 @@ public function prepare(string $sqlQuery): self;
      */
     public function lastSQL(): string;
 
+    /**
+     * @return string|null
+     */
+    public function lastError(): ?string;
+
     /**
      * @param $value
      * @return mixed