Merge pull request #2 from Bit-Apps-Pro/database-null-issue

fix: prepare null convert to empty string issue

Author: abdul-kaioum

src/QueryBuilder.php

@@ -998,6 +998,7 @@ public function prepare($sql = null)
         return empty($this->bindings)
          || strpos($sql, '%') === false
          ? $sql : Connection::prepare($sql, $this->bindings);
+
     }
 
     /**
@@ -1309,6 +1310,12 @@ private function bulkInsert($attributes)
                     ', ',
                     array_map(
                         function ($value) {
+
+                            if (\is_null($value)) {
+                                return 'NULL';
+                            }
+
+
                             $this->bindings[] = $value;
 
                             return $this->getValueType($value);
@@ -1451,7 +1458,9 @@ private function prepareAttributeForSaveOrUpdate($isUpdate = false)
                 $this->bindings[] = \is_array($this->_model->{$column})
                 || \is_object($this->_model->{$column})
                 ? wp_json_encode($this->_model->{$column}) : $this->_model->{$column};
-            } else {
+            }  elseif (\is_null($this->_model->{$column})) {
+                $this->bindings[] = null;
+            }else {
                 $this->bindings[] = '';
             }
         }
@@ -1495,10 +1504,17 @@ private function prepareInsert()
             . implode(
                 ', ',
                 array_map(
-                    function ($value) {
+                    function ($value, $key) {
+                        if (\is_null($value)) {
+                            unset($this->bindings[$key]);
+
+                            return 'NULL';
+                        }
+
                         return $this->getValueType($value);
                     },
-                    $this->bindings
+                    $this->bindings,
+                    array_keys($this->bindings)
                 )
             ) . ')';
 
@@ -1517,7 +1533,15 @@ private function prepareUpdate()
         $sql .= ' SET ';
         $columnCount = \count($this->update);
         foreach ($this->update as $key => $column) {
-            $sql .= $column . ' = ' . $this->getValueType($this->bindings[$key]);
+            // $sql .= $column . ' = ' . $this->getValueType($this->bindings[$key]);
+
+            if (\is_null($this->bindings[$key])) {
+                $sql .= $column . ' = NULL';
+                unset($this->bindings[$key]);
+            } else {
+                $sql .= $column . ' = ' . $this->getValueType($this->bindings[$key]);
+            }
+
             if ($key < $columnCount - 1) {
                 $sql .= ', ';
             }