fix missing static method

Author: francescobianco

composer.json

@@ -1,7 +1,7 @@
 {
     "name": "javanile/hamper",
     "description": "Developer friendly database library for vtiger",
-    "version": "0.0.1",
+    "version": "0.0.2",
     "license": "MIT",
     "type": "library",
     "authors": [

src/Hamper.php

@@ -2,17 +2,18 @@
 
 namespace Javanile\Hamper;
 
+
 class Hamper
 {
     /**
-     * @var
+     * @var HamperDatabase
      */
     protected static $instance;
 
     /**
-     *
+     * Get singletone instance of database.
      */
-    public function getInstance()
+    public static function getInstance()
     {
         if (self::$instance === null) {
             $pdb = \PearDatabase::getInstance();

src/HamperDatabase.php

@@ -155,6 +155,45 @@ public function fetchAll($sql, $params = [], $options = [])
         return $rows;
     }
 
+    /**
+     * Inserts the given record within the selected table.
+     *
+     * @param string $table The table's name on which the insert has to be executed.
+     * @param $key
+     * @param $value
+     * @param array $options Any additional option needed.
+     *
+     * @return bool
+     * @throws HamperException
+     * @usage query($sql, $params = [], $options = [])
+     */
+    public function exists($table, $key, $value, $options=[])
+    {
+        $sql = "SELECT `${key}` FROM `{$table}` WHERE `${key}` = ? LIMIT 1";
+
+        $handler = OptionsHandlerFactory::createInstance($options);
+        $results = $this->pearDatabase->pquery($sql, [$value], $handler->dieOnError, $handler->message);
+
+        if (!$results) {
+            throw HamperException::forSqlError(array(
+                'backtrace' => debug_backtrace(DEBUG_BACKTRACE_PROVIDE_OBJECT, 1),
+                'pearDatabase' => $this->pearDatabase,
+                //'sql' => $sql,
+                //'params' => $params,
+                //'dieOnError' => $handler->dieOnError,
+                //'message' => $handler->message
+            ));
+        }
+
+        try {
+            return boolval($this->pearDatabase->query_result_rowdata($results));
+        } catch (\Exception $e) {
+            // The above HamperException prevent this legacy exception
+        }
+
+        return false;
+    }
+
     /**
      * Inserts the given record within the selected table.
      *

tests/HamperDatabaseTest.php

@@ -68,6 +68,24 @@ public function testFetchAllFail()
         $this->hdb->fetchAll("POINTLESS BROKEN QUERY");
     }
 
+    public function testExists()
+    {
+        $data = [
+            'field1' => md5(time().rand()).'1',
+            'field2' => md5(time().rand()).'2',
+        ];
+
+        try {
+            $this->hdb->query("CREATE TABLE IF NOT EXISTS test (field1 TEXT, field2 TEXT)");
+            $res = $this->hdb->insert("test", $data);
+            $this->assertTrue(is_object($res));
+            $this->assertTrue($this->hdb->exists("test", "field1", $data['field1']));
+            $this->assertFalse($this->hdb->exists("test", "field1", $data['field2']));
+        } catch (HamperException $e) {
+            die($e->getMessage());
+        }
+    }
+
     public function testInsert()
     {
         $data = [