node-oracledb/test/getDataOfLob.js

/* Copyright (c) 2019, 2020, 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
 *   196. getDataOfLob.js
 *
 * DESCRIPTION
 *   Test the asynchronous method getData() on LOB columns.
 *
 *****************************************************************************/
'use strict';

const oracledb  = require('oracledb');
const should    = require('should');
const fs        = require('fs');
const util      = require('util');
const dbconfig  = require('./dbconfig.js');
const testsUtil = require('./testsUtil.js');

describe('196. getDataOfLob.js', () => {

  let conn;
  const tab1 = 'nodb_tab_myclob';
  const tab2 = 'nodb_tab_myblob';

  before('prepare the table', async () => {
    try {
      conn = await oracledb.getConnection(dbconfig);

      let sql =
        `create table ${tab1} (
          id number(9) not null,
          value clob not null
        )`;
      let plsql = testsUtil.sqlCreateTable(tab1, sql);
      await conn.execute(plsql);

      sql =
        `create table ${tab2} (
          id number(9) not null,
          value blob not null
        )`;
      plsql = testsUtil.sqlCreateTable(tab2, sql);
      await conn.execute(plsql);
    } catch(err) {
      should.not.exist(err);
    }
  }); // before()

  after(async () => {
    try {
      let sql = `drop table ${tab1} purge`;
      await conn.execute(sql);

      sql = `drop table ${tab2} purge`;
      await conn.execute(sql);

      await conn.close();
    } catch(err) {
      should.not.exist(err);
    }
  }); // after()

  it('196.1 getData() works on CLOB ', async () => {
    try {
      let content = 'A short string value';
      let sql = `insert into ${tab1} values (1, '${content}')`;
      await conn.execute(sql);

      sql = `select * from ${tab1} where id = 1`;
      const result = await conn.execute(sql);
      const clob = result.rows[0][1];
      const value = await clob.getData();

      should.strictEqual(value, content);

    } catch(err) {
      should.not.exist(err);
    }
  }); // 196.1

  it('196.2 getData() returns CLOB as Strings', async () => {

    try {
      const txtFile = 'test/clobexample.txt';
      const inStream = fs.createReadStream(txtFile);
      const num = 2;
      let sql = `insert into ${tab1} values (:i, empty_clob())
        returning value into :lobbv`;
      let binds = { i: num, lobbv: { type: oracledb.CLOB, dir: oracledb.BIND_OUT } };
      let opt = { autoCommit: false };

      // Insertion with Stream
      const result = await conn.execute(sql, binds, opt);

      const clob = result.outBinds.lobbv[0];
      inStream.pipe(clob);

      let insertionComplete = new Promise((resolve, reject) => {
        inStream.on('error', reject);
        clob.on('error', reject);
        clob.on('finish', () => resolve(conn.commit()));
      });

      await insertionComplete;

      // Query
      sql = `select value from ${tab1} where id = ${num}`;
      const outResult = await conn.execute(sql);
      const outLob = outResult.rows[0][0];

      const queryResult = await outLob.getData();

      // Verify
      const readFile = util.promisify(fs.readFile);
      const content = await readFile(txtFile);
      should.strictEqual(queryResult, content.toString());

    } catch(err) {
      should.not.exist(err);
    }

  }); // 196.2

  it('196.3 getData() on BLOB', async () => {
    try {
      let content = 'A somewhat longer BLOB value';
      let sql = `insert into ${tab2} values ( 1, utl_raw.cast_to_raw('${content}') )`;
      await conn.execute(sql);

      sql = `select * from ${tab2} where id = 1`;
      const result = await conn.execute(sql);
      const clob = result.rows[0][1];
      const value = await clob.getData();

      should.strictEqual(value.toString(), content);

    } catch(err) {
      should.not.exist(err);
    }
  }); // 196.3

  it('196.4 getData() returns BLOB as Buffer', async () => {
    try {
      const jpgFile = 'test/tree.jpg';
      const inStream = fs.createReadStream(jpgFile);
      const num = 2;
      let sql = `insert into ${tab2} values (:i, empty_blob())
        returning value into :lobbv`;
      let binds = { i: num, lobbv: { type: oracledb.BLOB, dir: oracledb.BIND_OUT } };
      let opt = { autoCommit: false };

      // Insertion with Stream
      const result = await conn.execute(sql, binds, opt);

      const blob = result.outBinds.lobbv[0];
      inStream.pipe(blob);

      let insertionComplete = new Promise((resolve, reject) => {
        inStream.on('error', reject);
        blob.on('error', reject);
        blob.on('finish', () => resolve(conn.commit()));
      });

      await insertionComplete;

      // Query
      sql = `select value from ${tab2} where id = ${num}`;
      const outResult = await conn.execute(sql);
      const outLob = outResult.rows[0][0];

      const queryResult = await outLob.getData();

      // Verify
      const readFile = util.promisify(fs.readFile);
      const content = await readFile(jpgFile);
      let isEqual = content.equals(queryResult);
      (isEqual).should.be.true();

    } catch(err) {
      should.not.exist(err);
    }
  }); // 196.4

  it('196.5 getData() on empty LOB returns null', async () => {
    try {
      const tempLob = await conn.createLob(oracledb.BLOB);
      const value = await tempLob.getData();
      should.strictEqual(value, null);
      await tempLob.close();
    } catch(err) {
      should.not.exist(err);
    }
  }); // 196.5

  it('196.6 works with temp LOB', async () => {
    try {
      const inFileName = 'test/clobexample.txt';
      const tempLob = await conn.createLob(oracledb.CLOB);
      const inStream = fs.createReadStream(inFileName);

      inStream.pipe(tempLob);

      let insertionComplete = new Promise((resolve, reject) => {
        inStream.on('error', reject);
        tempLob.on('error', reject);
        tempLob.on('finish', resolve);
      });

      await insertionComplete;

      // Query
      const queryResult = await tempLob.getData();

      // Verify
      const readFile = util.promisify(fs.readFile);
      const content = await readFile(inFileName);
      should.strictEqual(queryResult, content.toString());

      await tempLob.close();
    } catch(err) {
      should.not.exist(err);
    }
  }); // 196.6

});