112 lines
3.5 KiB
JavaScript
112 lines
3.5 KiB
JavaScript
/* Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved. */
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/******************************************************************************
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*
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* You may not use the identified files except in compliance with the Apache
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* License, Version 2.0 (the "License.")
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*
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* You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0.
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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*
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* NAME
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* select2.js
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*
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* DESCRIPTION
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* Executes queries to show array and object output formats.
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* Gets results directly without using a ResultSet.
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* Uses Oracle's sample HR schema.
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*
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* Scripts to create the HR schema can be found at:
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* https://github.com/oracle/db-sample-schemas
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*
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******************************************************************************/
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var async = require('async');
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var oracledb = require('oracledb');
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var dbConfig = require('./dbconfig.js');
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// Oracledb properties are applicable to all connections and SQL
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// executions. They can also be set or overridden at the individual
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// execute() call level
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// fetchArraySize can be adjusted to tune the internal data transfer
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// from the Oracle Database to node-oracledb. The value does not
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// affect how, or when, rows are returned by node-oracledb to the
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// application. Buffering is handled internally by node-oracledb.
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// Benchmark to choose the optimal size for each application or query.
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//
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// oracledb.fetchArraySize = 100; // default value is 100
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// This script sets outFormat in the execute() call but it could be set here instead:
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//
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// oracledb.outFormat = oracledb.OBJECT;
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var doconnect = function(cb) {
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oracledb.getConnection(
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{
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user : dbConfig.user,
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password : dbConfig.password,
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connectString : dbConfig.connectString
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},
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cb);
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};
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var dorelease = function(conn) {
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conn.close(function (err) {
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if (err)
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console.error(err.message);
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});
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};
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// Default Array Output Format
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var doquery_array = function (conn, cb) {
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conn.execute(
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"SELECT location_id, city FROM locations WHERE city LIKE 'S%' ORDER BY city",
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function(err, result) {
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if (err) {
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return cb(err, conn);
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} else {
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console.log("----- Cities beginning with 'S' (default ARRAY output format) --------");
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console.log(result.rows);
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return cb(null, conn);
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}
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});
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};
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// Optional Object Output Format
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var doquery_object = function (conn, cb) {
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conn.execute(
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"SELECT location_id, city FROM locations WHERE city LIKE 'S%' ORDER BY city",
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{}, // A bind variable parameter is needed to disambiguate the following options parameter
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// otherwise you will get Error: ORA-01036: illegal variable name/number
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{ outFormat: oracledb.OBJECT }, // outFormat can be OBJECT or ARRAY. The default is ARRAY
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function(err, result) {
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if (err) {
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return cb(err, conn);
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} else {
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console.log("----- Cities beginning with 'S' (OBJECT output format) --------");
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console.log(result.rows);
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return cb(null, conn);
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}
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});
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};
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async.waterfall(
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[
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doconnect,
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doquery_array,
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doquery_object
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],
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function (err, conn) {
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if (err) { console.error("In waterfall error cb: ==>", err, "<=="); }
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if (conn)
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dorelease(conn);
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});
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