120 lines
3.5 KiB
JavaScript
120 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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* lobinsert1.js
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*
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* DESCRIPTION
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* Reads text from clobexample.txt and INSERTs it into a CLOB column.
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* Reads binary data from fuzzydinosaur.jpg and INSERTs it into a BLOB column.
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*
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* "Small" amounts of data can be bound directly for INSERT into LOB
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* columns. Larger amounts should be streamed, see lobinssert2.js.
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* The boundary between 'small' and 'large' depends on how Node.js
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* and V8 handle large data in memory, and on your streaming and
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* performance requirements.
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*
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* Create clobexample.txt and fuzzydinosaur.jpg before running this example.
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* Use demo.sql to create the required table or do:
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* DROP TABLE mylobs;
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* CREATE TABLE mylobs (id NUMBER, c CLOB, b BLOB);
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*
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*****************************************************************************/
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var fs = require('fs');
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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.autoCommit = true; // for ease of demonstration only
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var clobInFileName = 'clobexample.txt'; // the file with text to be inserted into the database
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var blobInFileName = 'fuzzydinosaur.jpg'; // contains the image to be inserted into the database
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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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var docleanup = function (conn, cb) {
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conn.execute(
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'DELETE FROM mylobs',
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function(err) {
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return cb(err, conn);
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});
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};
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var doclobinsert = function(conn, cb) {
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var str = fs.readFileSync(clobInFileName, 'utf8');
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conn.execute(
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"INSERT INTO mylobs (id, c) VALUES (:id, :c)",
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{ id: 1, c: str },
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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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}
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if (result.rowsAffected != 1) {
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return cb(new Error('Error inserting CLOB'), conn);
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}
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console.log('CLOB inserted from ' + clobInFileName);
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return cb(null, conn);
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});
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};
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var doblobinsert = function(conn, cb) {
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var buf = fs.readFileSync(blobInFileName);
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conn.execute(
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"INSERT INTO mylobs (id, b) VALUES (:id, :b)",
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{ id: 2, b: buf },
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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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}
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if (result.rowsAffected != 1) {
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return cb(new Error('Error inserting BLOB'), conn);
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}
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console.log('BLOB inserted from ' + blobInFileName);
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return cb(null, conn);
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});
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};
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// Main routine
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// Connect and call the CLOB and BLOB insertion examples
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async.waterfall([
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doconnect,
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docleanup,
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doclobinsert,
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doblobinsert
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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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