diff --git a/src/core/Model.php b/src/core/Model.php
index dc4c410..e6221a5 100644
--- a/src/core/Model.php
+++ b/src/core/Model.php
@@ -8,6 +8,9 @@ use PDO;
 use PDOException;
 use Exception;
 
+/**
+ * Class Model.
+ */
 class Model
 {
     /**
@@ -77,7 +80,7 @@ class Model
             $properties = $refClass->getProperties(ReflectionProperty::IS_PRIVATE);
             foreach ($properties as $property) {
                 $propertyTags = $app->parseTagsFromComment($property->getDocComment(),
-                    'ColumnName|ColumnOption|ColumnType');
+                    'ColumnName|ColumnOption|ColumnType|PDOType');
 
                 if ($propertyTags) {
                     if (array_key_exists('ColumnName', $propertyTags)) {
@@ -151,11 +154,24 @@ class Model
 
             $where_sql = '';
             $mode_sql = '';
-            if (is_null($where)) {
-                if (is_null($records) || !count($records)) {
-                    throw new Exception('$records unspecified.');
-                }
 
+            if (is_null($where) && (is_null($records) || !count($records))) {
+                throw new Exception('$records unspecified.');
+            }
+
+            if ($where) {
+                $where_sql .= str_replace(
+                    array_map(function ($item) {
+                        return "{{$item}}";
+                    }, array_keys($internal_table_map['fields'])),
+                    array_map(function ($item) {
+                        return "`{$item}`";
+                    }, array_values($internal_table_map['fields'])),
+                    $where
+                );
+            }
+
+            if (is_array($records) && count($records)) {
                 if (is_null($column)) {
                     $column_name = "`{$internal_table_map['id']}`";
                 } else {
@@ -178,11 +194,12 @@ class Model
                 if (empty($mode_sql)) {
                     throw new Exception('Bad $mode');
                 }
-                $query = $model->app->db->prepare("SELECT $select_fields FROM `{$internal_table_map['name']}` WHERE $mode_sql $order_sql $limit_sql;");
-            } else {
-                $query = $model->app->db->prepare("SELECT $select_fields FROM `{$internal_table_map['name']}` ;");
+
+                $where_sql = $mode_sql.($where ? " AND ($where_sql)" : '');
             }
 
+            $query = $model->app->db->prepare("SELECT $select_fields FROM `{$internal_table_map['name']}` WHERE $where_sql $order_sql $limit_sql;");
+
             $num = 0;
             $params = [];
 
@@ -202,6 +219,14 @@ class Model
                 }
             }
 
+            if (count($bind) && $where) {
+                foreach ($bind as $parameter => $variable) {
+                    $params[$num] = $variable;
+                    $query->bindParam($parameter, $params[$num]);
+                    ++$num;
+                }
+            }
+
             $query->execute();
 
             $data = $query->fetchAll(PDO::FETCH_ASSOC);
@@ -228,6 +253,88 @@ class Model
         return null;
     }
 
+    /**
+     * Save models
+     *
+     * @param Model[] $models
+     *
+     * @return bool
+     *
+     * @throws Exception
+     */
+    public static function save(array $models): bool
+    {
+        if (count($models)) {
+            if ($models[0] instanceof Model) {
+                if ('db' !== $models[0]->getModelType()) {
+                    throw new Exception('Item 0 is not Model of a db type');
+                }
+                $db = $models[0]->app->db;
+                $db->beginTransaction();
+                foreach ($models as $number => $model) {
+                    if ($model instanceof Model) {
+                        if ('db' !== $model->getModelType()) {
+                            $db->rollBack();
+                            throw new Exception("Item $number is not Model of a db type");
+                        }
+
+                        $table_map = $model->getInternalTableMap();
+
+                        $operation = 'INSERT INTO';
+                        $suffix = '';
+
+                        $data_model = [];
+                        (function () use (&$data_model, $table_map) {
+                            foreach ($table_map['fields'] as $name => $db_field) {
+                                $data_model[$name] = $this->{$name};
+                            }
+                        })->call($model);
+
+                        $update_mode = !is_null($data_model[$table_map['id']]);
+                        if ($update_mode) {
+                            $operation = 'UPDATE';
+                            $suffix = ' WHERE `'.$table_map['fields'][$table_map['id']].'` = :param_'.$table_map['id'];
+                        }
+
+                        $pairs = [];
+                        foreach ($table_map['fields'] as $param_name => $column_name) {
+                            if ($table_map['id'] !== $param_name) {
+                                $pairs[] = "`{$column_name}` = :param_{$param_name}";
+                            }
+                        }
+                        $pairs_string = 'SET ' . implode(', ', $pairs);
+                        $query = $db->prepare($operation." `{$table_map['name']}` $pairs_string $suffix;");
+
+                        $bind_params = [];
+                        $num = 0;
+                        foreach ($data_model as $item => $value) {
+                            if ($table_map['id'] !== $item) {
+                                $bind_params[$num] = $value;
+                                $query->bindParam(':param_' . $item,
+                                    $bind_params[$num]);
+                                ++$num;
+                            }
+                        }
+                        if ($update_mode) {
+                            $bind_params[$num] = $data_model[$table_map['id']];
+                            $query->bindParam(':param_' . $table_map['id'],
+                                $bind_params[$num]);
+                        }
+
+                        $query->execute();
+                    }
+                }
+                $db->commit();
+
+                return true;
+            } else {
+                throw new Exception('Item 0 is not Model of a db type');
+            }
+        }
+
+        return false;
+    }
+
     /**
      * @return array
      */