Adding support for mysql error codes

MysqliDb.php

@@ -106,6 +106,12 @@ class MysqliDb
      */
     protected $_stmtError;
 
+    /**
+     * Variable which holds last statement error code
+     * @var int
+     */
+    protected $_stmtErrno;
+
     /**
      * Database credentials
      * @var string
@@ -393,6 +399,7 @@ public function rawQuery($query, $bindParams = null)
         $stmt->execute();
         $this->count = $stmt->affected_rows;
         $this->_stmtError = $stmt->error;
+        $this->_stmtErrno = $stmt->errno;
         $this->_lastQuery = $this->replacePlaceHolders($this->_query, $params);
         $res = $this->_dynamicBindResults($stmt);
         $this->reset();
@@ -464,6 +471,7 @@ public function query($query, $numRows = null)
         $stmt = $this->_buildQuery($numRows);
         $stmt->execute();
         $this->_stmtError = $stmt->error;
+        $this->_stmtErrno = $stmt->errno;
         $res = $this->_dynamicBindResults($stmt);
         $this->reset();
 
@@ -555,6 +563,7 @@ public function get($tableName, $numRows = null, $columns = '*')
 
         $stmt->execute();
         $this->_stmtError = $stmt->error;
+        $this->_stmtErrno = $stmt->errno;
         $res = $this->_dynamicBindResults($stmt);
         $this->reset();
 
@@ -676,6 +685,7 @@ public function update($tableName, $tableData, $numRows = null)
         $status = $stmt->execute();
         $this->reset();
         $this->_stmtError = $stmt->error;
+        $this->_stmtErrno = $stmt->errno;
         $this->count = $stmt->affected_rows;
 
         return $status;
@@ -707,6 +717,7 @@ public function delete($tableName, $numRows = null)
         $stmt = $this->_buildQuery($numRows);
         $stmt->execute();
         $this->_stmtError = $stmt->error;
+        $this->_stmtErrno = $stmt->errno;
         $this->reset();
 
         return ($stmt->affected_rows > 0);
@@ -1037,6 +1048,7 @@ private function _buildInsert($tableName, $insertData, $operation)
         $stmt = $this->_buildQuery(null, $insertData);
         $status = $stmt->execute();
         $this->_stmtError = $stmt->error;
+        $this->_stmtErrno = $stmt->errno;
         $haveOnDuplicate = !empty ($this->_updateColumns);
         $this->reset();
         $this->count = $stmt->affected_rows;
@@ -1583,6 +1595,14 @@ public function getLastError()
         return trim($this->_stmtError . " " . $this->mysqli()->error);
     }
 
+    /**
+     * Method returns mysql error code
+     * @return int
+     */
+    public function getLastErrno () {
+        return $this->_stmtErrno;
+    }
+
     /**
      * Mostly internal method to get query and its params out of subquery object
      * after get() and getAll()

readme.md

@@ -19,6 +19,7 @@ MysqliDb -- Simple MySQLi wrapper and object mapper with prepared statements
 **[Has method](#has-method)**  
 **[Helper Methods](#helper-methods)**  
 **[Transaction Helpers](#transaction-helpers)**  
+**[Error Helpers](#error-helpers)**
 
 ### Installation
 To utilize this class, first import MysqliDb.php into your project, and require it.
@@ -621,6 +622,17 @@ if (!$db->insert ('myTable', $insertData)) {
 }
 ```
 
+### Error helpers
+After you executed a query you have options to check if there was an error. You can get the MySQL error string or the error code for the last executed query. 
+```php
+$db->where('login', 'admin')->update('users', ['firstName' => 'Jack']);
+
+if ($db->getLastErrno() === 0)
+    echo 'Update succesfull';
+else
+    echo 'Update failed. Error: '. $db->getLastError();
+```
+
 ### Query exectution time benchmarking
 To track query execution time setTrace() function should be called.
 ```php