jones-ndb/Converters/NdbDatetimeConverter.js

Native NDB (MySQL Cluster) Service Provider for Database Jones

/*
 Copyright (c) 2013, 2016, Oracle and/or its affiliates. All rights
 reserved.
 
 This program is free software; you can redistribute it and/or
 modify it under the terms of the GNU General Public License
 as published by the Free Software Foundation; version 2 of
 the License.
 
 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 GNU General Public License for more details.
 
 You should have received a copy of the GNU General Public License
 along with this program; if not, write to the Free Software
 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 02110-1301  USA
*/

"use strict";


/**********************
  This is the standard TypeConverter class used with DATETIME columns 
  in the Ndb Adapter.
  
  DATETIME columns are read and written using a MySQLTime structure,
  which provides lossless interchange.
  
  This Converter converts between MySQLTime and standard JavaScript Date.  

  While convenient, such a conversion can result in lost precision. 
  JavaSCript Date supports millisecond precision, while MySQL DATETIME
  can support up to microsecond precision.

  An application can override this converter and use MySQLTime directly:
    sessionFactory.registerTypeConverter("DATETIME", null);
  
  Or replace this converter with a custom one:
    sessionFactory.registerTypeConverter("DATETIME", myConverterClass);
      
************************/


var jones = require("database-jones"),
    MySQLTime = require(jones.common.MySQLTime),
    udebug = unified_debug.getLogger("NdbDatetimeConverter.js");


exports.toDB = function(jsdate) {
  var dbtime;
  if(typeof jsdate === 'object') {
    dbtime = new MySQLTime().initializeFromJsDateLocal(jsdate);
  } else if(jsdate === null) {
    dbtime = null;
  }
  return dbtime;
};

exports.fromDB = function(dbTime) {
  if(dbTime === null) {
    return null;
  }
  if(typeof dbTime === 'object') {
    return MySQLTime.initializeFromNdb(dbTime).toJsDateLocal();
  }
};