Added new methods (whereNull, whereNotNull), Updated query method, up…

…dated documentation and code optimizaiton.

DOCS.md

@@ -101,7 +101,8 @@ $db = new \Buki\Pdox($config);
  * [groupBy](#groupby)
  * [having](#having)
  * [orderBy](#orderby)
- * [limit](#limit)
+ * [limit](#limit-offset)
+ * [pagination](#pagination)
  * [insert](#insert)
  * [update](#update)
  * [delete](#delete)
@@ -239,6 +240,8 @@ You can use this method in 4 ways. These;
 - orWhere
 - notWhere
 - orNotWhere
+- whereNull
+- whereNotNull
 
 Example:
 ```php
@@ -249,6 +252,9 @@ $db->table('test')->where('active', 1)->notWhere('auth', 1)->getAll();
 
 $db->table('test')->where('age', 20)->orWhere('age', '>', 25)->getAll();
 # Output: "SELECT * FROM test WHERE age = '20' OR age > '25'"
+
+$db->table('test')->whereNotNull('email')->getAll();
+# Output: "SELECT * FROM test WHERE email IS NOT NULL"
 ```
 
 ### grouped
@@ -387,7 +393,7 @@ $db->table('test')->where('status', 1)->orderBy('rand()')->limit(10)->getAll();
 # Output: "SELECT * FROM test WHERE status='1' ORDER BY rand() LIMIT 10"
 ```
 
-### limit
+### limit - offset
 ```php
 # Usage 1: One parameter
 $db->table('test')->limit(10)->getAll();
@@ -397,6 +403,22 @@ $db->table('test')->limit(10)->getAll();
 # Usage 2: Two parameters
 $db->table('test')->limit(10, 20)->getAll();
 # Output: "SELECT * FROM test LIMIT 10, 20"
+
+# Usage 3: with offset method
+$db->table('test')->limit(10)->offset(10)->getAll();
+# Output: "SELECT * FROM test LIMIT 10 OFFSET 10"
+```
+
+### pagination
+```php
+# First parameter: Data count of per page
+# Second parameter: Active page
+
+$db->table('test')->pagination(15, 1)->getAll();
+# Output: "SELECT * FROM test LIMIT 15 OFFSET 0"
+
+$db->table('test')->pagination(15, 2)->getAll();
+# Output: "SELECT * FROM test LIMIT 15 OFFSET 15"
 ```
 
 ### insert
@@ -483,8 +505,14 @@ $db->table(['users', 'pages'])->repair();
 
 ### query
 ```php
-$db->query('SELECT * FROM test WHERE id=? AND status=?', [10, 1]);
-# Output: "SELECT * FROM test WHERE id='10' AND status='1'"
+# Usage 1: Select all records
+$db->query('SELECT * FROM test WHERE id=? AND status=?', [10, 1])->fetchAll();
+
+# Usage 2: Select one record
+$db->query('SELECT * FROM test WHERE id=? AND status=?', [10, 1])->fetch();
+
+# Usage 3: Other queries like Update, Insert, Delete etc...
+$db->query('DELETE FROM test WHERE id=?', [10])->exec();
 ```
 
 ### insertId

src/Cache.php

@@ -13,14 +13,15 @@
 
 class Cache
 {
-  private $cacheDir = null;
-  private $cache    = null;
-  private $finish   = null;
+  protected $cacheDir = null;
+  protected $cache    = null;
+  protected $finish   = null;
 
   function __construct($dir = null, $time = 0)
   {
-    if(!file_exists($dir))
+    if (! file_exists($dir)) {
       mkdir($dir, 0755);
+    }
 
     $this->cacheDir = $dir;
     $this->cache = $time;
@@ -29,40 +30,42 @@ function __construct($dir = null, $time = 0)
 
   public function setCache($sql, $result)
   {
-    if (is_null($this->cache))
+    if (is_null($this->cache)) {
       return false;
+    }
 
     $cacheFile = $this->cacheDir . $this->fileName($sql) . '.cache';
     $cacheFile = fopen($cacheFile, 'w');
 
-    if($cacheFile)
-      fputs($cacheFile, json_encode(["data" => $result, "finish" => $this->finish]));
+    if ($cacheFile) {
+      fputs($cacheFile, json_encode(['data' => $result, 'finish' => $this->finish]));
+    }
 
     return;
   }
 
   public function getCache($sql, $array = false)
   {
-    if (is_null($this->cache))
+    if (is_null($this->cache)) {
       return false;
+    }
 
-    $cacheFile = $this->cacheDir . $this->fileName($sql) . ".cache";
-
+    $cacheFile = $this->cacheDir . $this->fileName($sql) . '.cache';
     if (file_exists($cacheFile)) {
       $cache = json_decode(file_get_contents($cacheFile), $array);
 
-      if (($array ? $cache["finish"] : $cache->finish) < time()) {
+      if (($array ? $cache['finish'] : $cache->finish) < time()) {
         unlink($cacheFile);
         return;
       }
-      else
-        return ($array ? $cache["data"] : $cache->data);
+
+      return ($array ? $cache['data'] : $cache->data);
     }
 
     return false;
   }
 
-  private function fileName($name)
+  protected function fileName($name)
   {
     return md5($name);
   }