CRUD layer for AMS

--HG--
branch : Gsoc14-ryzomAppImprovements

code/ryzom/tools/server/ryzom_ams/ams_lib/autoload/dblayer.php

@@ -81,5 +81,113 @@ class DBLayer{
         $this->PDO->commit();
         return $lastId;
     }
-    
-}
+   /**
+     * 
+     * Select function using prepared statement
+     * @param string $tb_name Table Name to Select
+     * @param array $data Associative array
+     * @param string $where where to select
+     * @return array Array containing fetched data
+     */
+    public function select($query, $data)
+    {
+        try{        	
+            $sth = $this->PDO->prepare($query);
+			$this->PDO->beginTransaction();	
+            $sth->execute(array($data));            
+            $this->PDO->commit();	
+        }catch(Exception $e)
+        {
+           $this->PDO->rollBack();
+            throw new Exception("error selection");
+               return false;
+        }        
+        return $sth;
+    }
+
+    /**
+     *
+     * Update function with prepared statement
+     * @param string $tb_name name of the table
+     * @param array $data associative array with values
+     * @param string $where where part
+     * @throws Exception error in updating
+     */
+    public function update($tb_name, $data, $where)
+    {
+        $field_option_values=null;
+        foreach ($data as $key => $value)
+        {
+            $field_option_values.=",$key".'=:'.$value;
+        }
+        $field_option_values = ltrim($field_option_values,',');
+        try {
+            $sth = $this->PDO->prepare("UPDATE $tb_name SET $field_option_values WHERE $where ");
+
+            foreach ($data as $key => $value)
+            {
+                $sth->bindValue(":$key", $value);
+            }
+			$this->PDO->beginTransaction();
+            $sth->execute();
+            $this->PDO->commit();
+        }catch (Exception $e)
+        {
+            $this->PDO->rollBack();
+            throw new Exception('error in updating');
+        }
+    }
+    /**
+     *
+     * insert function using prepared statements
+     * @param string $tb_name Name of the table to insert in
+     * @param array $data Associative array of data to insert
+     */
+     
+    public function insert($tb_name, $data)
+    {
+        $field_values =':'. implode(',:', array_keys($data));
+        $field_options = implode(',', array_keys($data));		
+        try{
+            $sth = $this->PDO->prepare("INSERT INTO $tb_name ($field_options) VALUE ($field_values)");
+            foreach ($data as $key => $value )
+            {
+            	
+                $sth->bindValue(":$key", $value);
+            }
+            $this->PDO->beginTransaction();
+            //execution
+            $sth->execute();
+            $this->PDO->commit();
+
+        }catch (Exception $e)
+        {
+            //for rolling back the changes during transaction
+            $this->PDO->rollBack();
+            throw new Exception("error in inseting");
+        }
+    }
+
+    /**
+     *
+     * Delete database entery using prepared statement
+     * @param string $tb_name
+     * @param string $where
+     * @throws error in deleting
+     */
+    public function delete($tb_name, $where)
+    {
+        try {
+            $sth = $this->prepare("DELETE FROM $tb_name WHERE $where");
+            $this->PDO->beginTransaction();
+            $sth->execute();
+            $this->PDO->commit();
+        }
+        catch (Exception $e)
+        {
+            $this->rollBack();
+            throw new Exception("error in deleting");
+        }
+
+    } 
+}