nosqldb-oraclejs
Version:
Oracle NoSQL Database JS Driver
179 lines (166 loc) • 6.2 kB
JavaScript
/*-
*
* 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:
*
* Oracle NoSQL Database server software is free software: you can
* redistribute it and/or modify it under the terms of the GNU Affero
* General Public License as published by the Free Software Foundation,
* version 3.
*
* Oracle NoSQL Database 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
* 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:
*
* Oracle NoSQL Database client software is free software: you can
* redistribute it and/or modify it under the terms of the Apache License
* as published by the Apache Software Foundation, version 2.0.
*
* You should have received a copy of the GNU Affero General Public License
* and/or the Apache License in the LICENSE file along with Oracle NoSQL
* Database client or server distribution. If not, see
* <http://www.gnu.org/licenses/>
* or
* <http://www.apache.org/licenses/LICENSE-2.0>.
*
* An active Oracle commercial licensing agreement for this product supersedes
* these licenses and in such case the license notices, but not the copyright
* notice, may be removed by you in connection with your distribution that is
* in accordance with the commercial licensing terms.
*
* For more information please contact:
*
* berkeleydb-info_us@oracle.com
*
*/
;
/**
* This example demonstrates the executeFuture method. The example:
* - Creates a table.
* - Creates an index using ExecuteFuture objects.
* - Executes multiGet while the process is in the background.
* - Waits for the background process to finish.
* - Deletes the Index.
*/
// 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';
// Create a store with the specified configuration
var store = nosqldb.createStore(configuration);
var TABLE_NAME = 'test_table_FUTURE';
var TABLE_IDX = 'test_table_FUTURE_IDX';
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'}
};
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 < 10000; i++) {
row.id = i;
row.indexKey1 = i;
store.put(TABLE_NAME, row);
}
// Create an index with executeFuture
// Normally indexes should be created before data is added, but
// this is done after for purposes of the example
console.log('Creating index ' + TABLE_IDX + ' asynchronously using ' +
'a future');
store.executeFuture(
' CREATE INDEX IF NOT EXISTS ' + TABLE_IDX +
' ON ' + TABLE_NAME + ' ( indexKey1 ) ',
function (err, executionFuture) {
if (err)
throw err;
else if (!(executionFuture.statementResult.isDone ||
executionFuture.statementResult.isCancelled)) {
// Check the status again...
console.log('Check status again...');
executionFuture.updateStatus(function (err) {
if (err)
throw err;
else {
console.log('Info about the process updated.');
}
});
// Execute multiGet() while ExecuteFuture is in the background
console.log('Executing multiGet() while index creation ' +
' runs in the background');
store.multiGet(TABLE_NAME, {shardKey: 1, id: 1},
function (err, result) {
if (err)
throw err;
else
console.log(result);
});
// Wait for process to finish...
console.log('Wait for index creation to finish...');
executionFuture.get(function (err) {
if (err)
throw err;
else {
console.log('Index creation complete.');
store.close();
}
});
} else {
if (executionFuture.statementResult.isDone) {
console.log('Index already exists, it will be dropped. ' +
'Run the example again on return.');
store.execute(
'DROP INDEX IF EXISTS ' + TABLE_IDX + ' ON ' + TABLE_NAME,
function (err) {
console.log('Index dropped.');
store.close();
console.log('Store closed.')
})
} else {
console.log('Unexpected exit...');
store.close();
}
}
}); // ExecuteFuture
}
});
});