nosqldb-oraclejs/examples/multiget.js

Oracle NoSQL Database JS Driver

/*-
 *
 *  This file is part of Oracle NoSQL Database
 *  Copyright (C) 2014, 2018 Oracle and/or its affiliates.  All rights reserved.
 *
 * If you have received this file as part of Oracle NoSQL Database the
 * following applies to the work as a whole:
 *
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 *   General Public License as published by the Free Software Foundation,
 *   version 3.
 *
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 *   Affero General Public License for more details.
 *
 * If you have received this file as part of Oracle NoSQL Database Client or
 * distributed separately the following applies:
 *
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 *   redistribute it and/or modify it under the terms of the Apache License
 *   as published by the Apache Software Foundation, version 2.0.
 *
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'use strict';

/**
 * This example demonstrates use of the multiGet method to retrieve a
 * number of related rows in a single transaction. The example:
 * - Creates a table.
 * - Adds 100 rows to the table.
 * - Uses multiGet with a Primary Key.
 */

// Include nosqldb-oraclejs module
var nosqldb = require('nosqldb-oraclejs');
var Types = nosqldb.Types;

// Create a configuration object
var configuration = new nosqldb.Configuration();
configuration.proxy.startProxy = true;
configuration.proxy.host = 'localhost:5010';
configuration.storeHelperHosts = ['localhost:5000'];
configuration.storeName = 'kvstore';

// Set a readOptions object:
var readOptions =
  new Types.ReadOptions(
    Types.SimpleConsistency.NONE_REQUIRED,
    1000);

var TABLE_NAME = 'test_table_MULTIGET';

var row = {
  id: 1,
  shardKey: 1,
  indexKey1: 1,
  indexKey2: 1,
  s: 'String value',
  address: {
    street: 'address street', city: 'address city',
    state: 'address state', zip: 55555
  },
  m: {field1: 'map field 1', field2: 'map field 2'}
};

// Create a store with the specified configuration
var store = nosqldb.createStore(configuration);

store.open(function (err) {
  if (err)
    throw err;
  // create table
  console.log('Creating table ' + TABLE_NAME);
  store.execute(
    'CREATE TABLE IF NOT EXISTS ' + TABLE_NAME +
    ' ( shardKey INTEGER, ' +
    '   id INTEGER, ' +
    '   indexKey1 INTEGER, ' +
    '   indexKey2 INTEGER, ' + '' +
    '   s STRING, ' +
    '   address RECORD ' +
    '     (street STRING, city STRING, state STRING, ' +
    '      zip INTEGER), ' +
    '   m MAP (STRING), ' +
    '   primary KEY(SHARD(shardKey), id) ) ',
    function (err) {
      if (err)
        throw err;
      else {

        // Put some data in the table
        console.log('Adding data to the table');
        for (var i = 0; i < 100; i++) {
          row.id = i;
          row.indexKey1 = i;
          store.put(TABLE_NAME, row);
        }

        // MultiGet() requires a complete shard key as the primary key.
        var shardKey = {shardKey: 1};
        var fieldRange = new Types.FieldRange('id', 0, true, 99, true);
        // Call the iterator
        store.multiGet(TABLE_NAME, shardKey,
          {readOptions: readOptions, fieldRange: fieldRange},
          function (err, result) {
            console.log('Retrieved ids:');
            if (err)
              throw err;
            else {
              for (var index in result.returnRows)
                console.log(result.returnRows[index].row.id + ' ');
              store.close();
            }
          });
      }
    });
});