122 lines
3.5 KiB
JavaScript
122 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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* selectjsonblob.js
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*
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* DESCRIPTION
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* Executes sample insert and query statements using a JSON column with BLOB storage.
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* Requires Oracle Database 12.1.0.2, which has extensive JSON datatype support.
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* See https://www.oracle.com/pls/topic/lookup?ctx=dblatest&id=ADJSN
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*
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* Use demo.sql to create the required table.
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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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var doconnect = function(cb) {
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oracledb.getConnection(dbConfig, 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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var checkver = function (conn, cb) {
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if (conn.oracleServerVersion < 1201000200) {
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return cb(new Error('This example only works with Oracle Database 12.1.0.2 or greater'), conn);
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} else {
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return cb(null, conn);
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}
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};
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// Insert some JSON data
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var doinsert = function (conn, cb) {
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var data = { "userId": 2, "userName": "Bob", "location": "USA" };
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var s = JSON.stringify(data);
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var b = Buffer.from(s, 'utf8');
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conn.execute(
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"INSERT INTO j_purchaseorder_b (po_document) VALUES (:lobbv)",
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{ lobbv: b },
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// { autoCommit: true }, // uncomment if you want data to persist
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function(err) {
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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("Data inserted successfully.");
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return cb(null, conn);
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}
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});
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};
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// Select JSON with JSON_EXISTS
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var dojsonquery = function (conn, cb) {
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console.log('Selecting JSON stored in a BLOB column:');
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conn.execute(
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"SELECT po_document FROM j_purchaseorder_b WHERE JSON_EXISTS (po_document, '$.location')",
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[],
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{ fetchInfo: { "PO_DOCUMENT": { type: oracledb.BUFFER } } }, // Fetch as a Buffer instead of a Stream
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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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if (result.rows.length === 0)
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return cb(new Error('No results'), conn);
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console.log(result.rows[0][0].toString('utf8'));
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return cb(null, conn);
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});
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};
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// Select a JSON value using dot-notation. This syntax requires Oracle Database 12.2
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var dojsonquerydot = function (conn, cb) {
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console.log('Selecting a JSON value:');
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conn.execute(
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"SELECT pob.po_document.location FROM j_purchaseorder_b pob",
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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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if (result.rows.length === 0)
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return cb(new Error('No results'), conn);
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console.log(result.rows[0][0]);
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return cb(null, conn);
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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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checkver,
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doinsert,
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dojsonquery,
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dojsonquerydot
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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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