Added getValue function

Author: avbdr

MysqliDb.php

@@ -283,6 +283,23 @@ public function getOne($tableName, $columns = '*')
         return null;
     }
 
+    /**
+     * A convenient SELECT * function to get one value.
+     *
+     * @param string  $tableName The name of the database table to work with.
+     *
+     * @return array Contains the returned column from the select query.
+     */
+    public function getValue($tableName, $column) 
+    {
+        $res = $this->get ($tableName, 1, "{$column} as retval");
+
+        if (isset($res[0]["retval"]))
+            return $res[0]["retval"];
+
+        return null;
+    }
+
     /**
      *
      * @param <string $tableName The name of the table.

readme.md

@@ -121,6 +121,13 @@ $stats = $db->getOne ("users", "sum(id), count(*) as cnt");
 echo "total ".$stats['cnt']. "users found";
 ```
 
+or select one column or function result
+
+```php
+$count = getValue ("users", "count(*)");
+echo "{$count} users found";
+```
+
 ### Delete Query
 ```php
 $db->where('id', 1);