<?php

  class mw_sgbd{

    var $sgbd_impl;
    var $env;

    function mw_sgbd($sgbd_impl, $env){
      $this->sgbd_impl = $sgbd_impl;
      $this->env = $env;
    }

    function extention_ok(){
      return $this->sgbd_impl->extention_ok($this->env);
    }

    function authentication_required(){
      return $this->sgbd_impl->authentication_required();
    }

    function connect($host, $base, $user, $password){
      return $this->sgbd_impl->connect($host, $base, $user, $password);
    }

    function select_db($db_name){
      return $this->sgbd_impl->select_db($db_name);
    }

    # ---------------------------------------------------------------------------------
    #                                                                               SQL
    #

    function desc_table($table_name){
      if(!method_exists($this->sgbd_impl, "desc_table")) return false;
      return $this->sgbd_impl->desc_table(
        ($prefix_codes = array_keys($this->env->bdd("table_prefix"))) ?
          str_replace($prefix_codes, array_values($this->env->bdd("table_prefix")), $table_name)
        : $table_name
      );
    }

    function table_exists($table_name){
      if(!method_exists($this->sgbd_impl, "table_exists")) return false;
      return $this->sgbd_impl->table_exists(
        ($prefix_codes = array_keys($this->env->bdd("table_prefix"))) ?
          str_replace($prefix_codes, array_values($this->env->bdd("table_prefix")), $table_name)
        : $table_name
      );
    }

    function field_exists($table_name, $field_name){
      if(!method_exists($this->sgbd_impl, "field_exists")) return false;
      return $this->sgbd_impl->field_exists(
        (
          $prefix_codes = array_keys($this->env->bdd("table_prefix"))) ?
          str_replace($prefix_codes, array_values($this->env->bdd("table_prefix")), $table_name)
        : $table_name,
        $field_name
      );
    }

    function query($sql){
      if(!method_exists($this->sgbd_impl, "query")) return false;
      return $this->sgbd_impl->query(
        ($prefix_codes = array_keys($this->env->bdd("table_prefix"))) ?
          str_replace($prefix_codes, array_values($this->env->bdd("table_prefix")), $sql)
        : $sql
      );
    }

    function insert_id(){
      if(!method_exists($this->sgbd_impl, "insert_id")) return false;
      return $this->sgbd_impl->insert_id();
    }

    function fetch_assoc($rst){
      if(!method_exists($this->sgbd_impl, "fetch_assoc")) return false;
      return $this->sgbd_impl->fetch_assoc($rst);
    }

    function free_result($rst){
      if(!method_exists($this->sgbd_impl, "")) return false;
      return $this->sgbd_impl->free_result($rst);
    }

    function close(){
      if(!method_exists($this->sgbd_impl, "")) return false;
      return $this->sgbd_impl->close();
    }

    # ---------------------------------------------------------------------------------
    #                                                                               XML
    #

    function data_exists($data_path){
      if(!method_exists($this->sgbd_impl, "data_exists")) return false;
      return $this->sgbd_impl->data_exists($data_path);
    }

    function create_data($data_path){
      if(!method_exists($this->sgbd_impl, "create_data")) return false;
      return $this->sgbd_impl->create_data($data_path);
    }

    function get_data($data_path, $data_id){
      if(!method_exists($this->sgbd_impl, "get_data")) return false;
      return $this->sgbd_impl->get_data($data_path, $data_id);
    }

    function open_data($data_path, $FETCH = true){
      if(!method_exists($this->sgbd_impl, "open_data")) return false;
      return $this->sgbd_impl->open_data($data_path, $FETCH);
    }

    function fetch_data($dh){
      if(!method_exists($this->sgbd_impl, "fetch_data")) return false;
      return $this->sgbd_impl->fetch_data($dh);
    }

    function add_data($data_path, $data, $index = null){
      if(!method_exists($this->sgbd_impl, "add_data")) return false;
      return $this->sgbd_impl->add_data($data_path, $data, $index);
    }

    function last_index($dh){
      if(!method_exists($this->sgbd_impl, "last_index")) return false;
      return $this->sgbd_impl->last_index($dh);
    }

    function set_data($data_path, $data_id, $data){
      if(!method_exists($this->sgbd_impl, "set_data")) return false;
      return $this->sgbd_impl->set_data($data_path, $data_id, $data);
    }

    function del_data($data_path, $data_id){
      if(!method_exists($this->sgbd_impl, "del_data")) return false;
      return $this->sgbd_impl->del_data($data_path, $data_id);
    }

    function close_data($dh){
      if(!method_exists($this->sgbd_impl, "close_data")) return false;
      return $this->sgbd_impl->close_data($dh);
    }

    function remove_data($data_path){
      if(!method_exists($this->sgbd_impl, "remove_data")) return false;
      return $this->sgbd_impl->remove_data($data_path);
    }

  }

?>