feat: enhance sorting functionality with multi-order support and null checks

src/System/Database/MyModel/Model.php

@@ -49,7 +49,9 @@ class Model implements \ArrayAccess, \IteratorAggregate
     protected int $limit_start    = 0;
     protected int $limit_end      = 0;
     protected int $offset         = 0;
-    protected string $sort_order  = '';
+
+    /** @var array<string, string> */
+    protected $sort_order  = [];
 
     // magic ----------------------
 
@@ -543,14 +545,14 @@ public function limitOffset(int $limit, int $offset)
     /**
      * Set sort column and order
      * column name must register.
-     *
-     * @return static
      */
-    public function order(string $column_name, int $order_using = MyQuery::ORDER_ASC, ?string $belong_to = null)
+    public function order(string $column_name, int $order_using = MyQuery::ORDER_ASC, ?string $belong_to = null): self
     {
         $order = 0 === $order_using ? 'ASC' : 'DESC';
         $belong_to ??= $this->table_name;
-        $this->sort_order = "ORDER BY {$belong_to}.{$column_name} {$order}";
+        $res = "{$belong_to}.{$column_name}";
+
+        $this->sort_order[$res] = $order;
 
         return $this;
     }

src/System/Database/MyQuery/Query.php

@@ -38,8 +38,8 @@ abstract class Query
     /** @var int offest */
     protected $_offset = 0;
 
-    /** @var string Sort result ASC|DESC */
-    protected $_sort_order  = '';
+    /** @var array<string, string> Sort result ASC|DESC */
+    protected array $_sort_order  = [];
 
     public const ORDER_ASC  = 0;
     public const ORDER_DESC = 1;

src/System/Database/MyQuery/Select.php

@@ -166,12 +166,32 @@ public function limitOffset(int $limit, int $offset): self
     public function order(string $column_name, int $order_using = MyQuery::ORDER_ASC, ?string $belong_to = null)
     {
         $order = 0 === $order_using ? 'ASC' : 'DESC';
-        $belong_to ??= null === $this->_sub_query ? "{$this->_table}" : $this->_sub_query->getAlias();
-        $this->_sort_order = "ORDER BY $belong_to.$column_name $order";
+        $belong_to ??= null === $this->_sub_query ? $this->_table : $this->_sub_query->getAlias();
+        $res = "{$belong_to}.{$column_name}";
+
+        $this->_sort_order[$res] = $order;
 
         return $this;
     }
 
+    /**
+     * Set sort column and order
+     * with Column if not null.
+     */
+    public function orderIfNotNull(string $column_name, int $order_using = MyQuery::ORDER_ASC, ?string $belong_to = null): self
+    {
+        return $this->order("{$column_name} IS NOT NULL", $order_using, $belong_to);
+    }
+
+    /**
+     * Set sort column and order
+     * with Column if null.
+     */
+    public function orderIfNull(string $column_name, int $order_using = MyQuery::ORDER_ASC, ?string $belong_to = null): self
+    {
+        return $this->order("{$column_name} IS NULL", $order_using, $belong_to);
+    }
+
     /**
      * Adds one or more columns to the
      * GROUP BY clause of the SQL query.
@@ -195,7 +215,7 @@ protected function builder(): string
         $build['join']       = $this->joinBuilder();
         $build['where']      = $this->getWhere();
         $build['group_by']   = $this->getGroupBy();
-        $build['sort_order'] = $this->_sort_order;
+        $build['sort_order'] = $this->getOrderBy();
         $build['limit']      = $this->getLimit();
 
         $condition = implode(' ', array_filter($build, fn ($item) => $item !== ''));
@@ -232,7 +252,26 @@ private function getGroupBy(): string
         return "GROUP BY {$group_by}";
     }
 
-    public function sortOrderRef(int $limit_start, int $limit_end, int $offset, string $sort_ordder): void
+    private function getOrderBy(): string
+    {
+        if ([] === $this->_sort_order) {
+            return '';
+        }
+
+        $orders = [];
+        foreach ($this->_sort_order as $column => $order) {
+            $orders[] = "{$column} {$order}";
+        }
+
+        $orders = implode(', ', $orders);
+
+        return "ORDER BY {$orders}";
+    }
+
+    /**
+     * @param array<string, string> $sort_ordder
+     */
+    public function sortOrderRef(int $limit_start, int $limit_end, int $offset, $sort_ordder): void
     {
         $this->_limit_start = $limit_start;
         $this->_limit_end   = $limit_end;

tests/DataBase/Query/SelectTest.php

@@ -302,4 +302,46 @@ public function itCanSelectWithGroupBy(): void
             $select_multy->__toString()
         );
     }
+
+    /** @test */
+    public function itCanGenerateMultyOrder(): void
+    {
+        $select = MyQuery::from('base_1', $this->PDO)
+            ->select()
+            ->order('id', MyQuery::ORDER_ASC)
+            ->order('name', MyQuery::ORDER_DESC)
+        ;
+
+        $this->assertEquals(
+            'SELECT * FROM base_1 ORDER BY base_1.id ASC, base_1.name DESC',
+            $select->__toString(),
+            'order by query'
+        );
+    }
+
+    /** @test */
+    public function itCanSelectWithOrderIfNotNull()
+    {
+        $select = MyQuery::from('test', $this->PDO)
+            ->select()
+            ->orderIfNotNull('column_1');
+
+        $this->assertEquals(
+            'SELECT * FROM test ORDER BY test.column_1 IS NOT NULL ASC',
+            $select->__toString()
+        );
+    }
+
+    /** @test */
+    public function itCanSelectWithOrderIfNull()
+    {
+        $select = MyQuery::from('test', $this->PDO)
+            ->select()
+            ->orderIfNull('column_1');
+
+        $this->assertEquals(
+            'SELECT * FROM test ORDER BY test.column_1 IS NULL ASC',
+            $select->__toString()
+        );
+    }
 }