Merge pull request #183 from alexfacciorusso/master

Added “has” helper method, fixed closing php tag.

MysqliDb.php

@@ -267,7 +267,7 @@ class MysqliDb
             $columns = '*';
 
         $column = is_array($columns) ? implode(', ', $columns) : $columns; 
-        $this->_query = "SELECT $column FROM " .self::$_prefix . $tableName;
+        $this->_query = "SELECT $column FROM " . self::$_prefix . $tableName;
         $stmt = $this->_buildQuery($numRows);
 
         if ($this->isSubQuery)
@@ -345,6 +345,20 @@ class MysqliDb
         return true;
     }
 
+    /**
+     * A convenient function that returns TRUE if exists at least an element that
+     * satisfy the where condition specified calling the "where" method before this one.
+     *
+     * @param string  $tableName The name of the database table to work with.
+     *
+     * @return array Contains the returned rows from the select query.
+     */
+    public function has($tableName)
+    {
+        $this->getOne($tableName, '1');
+        return $this->count >= 1;
+    }
+
     /**
      * Update query. Be sure to first call the "where" method.
      *
@@ -1124,3 +1138,4 @@ class MysqliDb
         $this->rollback ();
     }
 } // END class
+?>
\ No newline at end of file

readme.md

@@ -14,7 +14,8 @@ MysqliDb -- Simple MySQLi wrapper with prepared statements
 **[Properties Sharing](#properties-sharing)**  
 **[Joining Tables](#join-method)**  
 **[Subqueries](#subqueries)**  
-**[EXISTS / NOT EXISTS condition](#exists--not-exists-condition)** 
+**[EXISTS / NOT EXISTS condition](#exists--not-exists-condition)**  
+**[Has method](#has-method)**  
 **[Helper Functions](#helper-commands)**  
 **[Transaction Helpers](#transaction-helpers)**  
 
@@ -386,6 +387,18 @@ $products = $db->get ("products");
 // Gives SELECT * FROM products WHERE EXISTS (select userId from users where company='testCompany')
 ```
 
+### Has method
+A convenient function that returns TRUE if exists at least an element that satisfy the where condition specified calling the "where" method before this one.
+```php
+$db->where("user", $user);
+$db->where("password", md5($password));
+if($db->has("users")) {
+    return "You are logged";
+} else {
+    return "Wrong user/password";
+}
+``` 
+
 ### Helper commands
 Reconnect in case mysql connection died
 ```php