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lobinserttemp.js
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/* Copyright (c) 2016, 2019, Oracle and/or its affiliates. All rights reserved. */
/******************************************************************************
*
* You may not use the identified files except in compliance with the Apache
* License, Version 2.0 (the "License.")
*
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0.
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
*
* See the License for the specific language governing permissions and
* limitations under the License.
*
* NAME
* lobinserttemp.js
*
* DESCRIPTION
* Creates a 'temporary CLOB', streams data into it from clobexample.txt, and
* then INSERTs it into a CLOB column.
*
* You may prefer the method shown in lobinsert2.js, which inserts
* directly into the table.
*
* Create clobexample.txt before running this example.
* Use demo.sql to create the required schema.
*
* This example requires node-oracledb 1.12 or later.
*
*****************************************************************************/
var fs = require('fs');
var async = require('async');
var oracledb = require('oracledb');
var dbConfig = require('./dbconfig.js');
var inFileName = 'clobexample.txt'; // the file with text to be inserted into the database
var doconnect = function(cb) {
oracledb.getConnection(
{
user : dbConfig.user,
password : dbConfig.password,
connectString : dbConfig.connectString
},
cb);
};
var dorelease = function(conn) {
conn.close(function (err) {
if (err)
console.error(err.message);
});
};
// Cleanup anything other than lobinsert1.js demo data
var docleanup = function (conn, cb) {
conn.execute(
'DELETE FROM mylobs WHERE id > 2',
function(err) {
return cb(err, conn);
});
};
var docreatetemplob = function (conn, cb) {
conn.createLob(oracledb.CLOB, function(err, templob) {
if (err) {
return cb(err);
}
console.log("Temporary LOB created with createLob()");
return cb(null, conn, templob);
});
};
var doloadtemplob = function (conn, templob, cb) {
console.log('Streaming from the text file into the temporary LOB');
var errorHandled = false;
templob.on(
'close',
function() {
console.log("templob.on 'close' event");
});
templob.on(
'error',
function(err) {
console.log("templob.on 'error' event");
if (!errorHandled) {
errorHandled = true;
return cb(err);
}
});
templob.on(
'finish',
function() {
console.log("templob.on 'finish' event");
// The data was loaded into the temporary LOB
if (!errorHandled) {
return cb(null, conn, templob);
}
});
console.log('Reading from ' + inFileName);
var inStream = fs.createReadStream(inFileName);
inStream.on(
'error',
function(err) {
console.log("inStream.on 'error' event");
if (!errorHandled) {
errorHandled = true;
return cb(err);
}
});
inStream.pipe(templob); // copies the text to the temporary LOB
};
var doinsert = function (conn, templob, cb) {
console.log('Inserting the temporary LOB into the database');
conn.execute(
"INSERT INTO mylobs (id, c) VALUES (:idbv, :lobbv)",
{ idbv: 3,
lobbv: templob }, // type and direction are optional for IN binds
{ autoCommit: true },
function(err, result) {
if (err) {
return cb(err);
}
console.log("Rows inserted: " + result.rowsAffected);
return cb(null, conn, templob);
});
};
// Applications should close LOBs that were created using createLob()
var doclosetemplob = function (conn, templob, cb) {
console.log('Closing the temporary LOB');
templob.close(function (err) {
if (err)
return cb(err);
else
return cb(null, conn);
});
};
async.waterfall(
[
doconnect,
docleanup,
docreatetemplob,
doloadtemplob,
doinsert,
doclosetemplob
],
function (err, conn) {
if (err) {
console.error("In waterfall error cb: ==>", err, "<==");
}
if (conn)
dorelease(conn);
});