oracledb

What is oracledb?

The oracledb npm package is a Node.js driver for Oracle Database, providing a way to connect to Oracle databases, execute SQL queries, and manage database transactions. It supports various features such as connection pooling, data types, and advanced Oracle Database features.

What are oracledb's main functionalities?

Connecting to Oracle Database

This code demonstrates how to establish a connection to an Oracle Database using the oracledb package. It includes error handling and ensures the connection is closed after use.

const oracledb = require('oracledb');

async function run() {
  let connection;

  try {
    connection = await oracledb.getConnection({
      user: 'your_username',
      password: 'your_password',
      connectString: 'localhost/XEPDB1'
    });
    console.log('Connection was successful!');
  } catch (err) {
    console.error(err);
  } finally {
    if (connection) {
      try {
        await connection.close();
      } catch (err) {
        console.error(err);
      }
    }
  }
}

run();

Executing SQL Queries

This code sample shows how to execute a SQL query using the oracledb package. It retrieves rows from the 'employees' table where the department_id is 101.

const oracledb = require('oracledb');

async function run() {
  let connection;

  try {
    connection = await oracledb.getConnection({
      user: 'your_username',
      password: 'your_password',
      connectString: 'localhost/XEPDB1'
    });

    const result = await connection.execute(
      `SELECT * FROM employees WHERE department_id = :id`,
      [101] // bind value for :id
    );

    console.log(result.rows);
  } catch (err) {
    console.error(err);
  } finally {
    if (connection) {
      try {
        await connection.close();
      } catch (err) {
        console.error(err);
      }
    }
  }
}

run();

Using Connection Pooling

This code demonstrates how to use connection pooling with the oracledb package. It creates a pool of connections, retrieves a connection from the pool, executes a query, and then closes the connection and the pool.

const oracledb = require('oracledb');

async function run() {
  let pool;

  try {
    pool = await oracledb.createPool({
      user: 'your_username',
      password: 'your_password',
      connectString: 'localhost/XEPDB1',
      poolMin: 2,
      poolMax: 10,
      poolIncrement: 1
    });

    const connection = await pool.getConnection();
    const result = await connection.execute(`SELECT * FROM employees`);
    console.log(result.rows);
    await connection.close();
  } catch (err) {
    console.error(err);
  } finally {
    if (pool) {
      try {
        await pool.close(0);
      } catch (err) {
        console.error(err);
      }
    }
  }
}

run();

Other packages similar to oracledb

mysql

The mysql package is a Node.js driver for MySQL databases. It provides similar functionalities to oracledb, such as connecting to the database, executing queries, and managing transactions. However, it is specifically designed for MySQL databases and does not support Oracle-specific features.

pg

The pg package is a Node.js driver for PostgreSQL databases. Like oracledb, it allows you to connect to the database, execute SQL queries, and manage transactions. It is tailored for PostgreSQL and includes features specific to that database system, but it does not support Oracle Database features.

mssql

The mssql package is a Node.js driver for Microsoft SQL Server. It offers functionalities similar to oracledb, such as database connections, query execution, and transaction management. It is designed for use with SQL Server and includes features specific to that database, but it does not support Oracle Database features.

README

node-oracledb version 1.11

About node-oracledb

The node-oracledb add-on for Node.js powers high performance Oracle Database applications.

Use node-oracledb to connect Node.js 0.10, 0.12, 4, and 6 to Oracle Database.

The add-on is stable, well documented, and has a comprehensive test suite.

The node-oracledb project is open source and maintained by Oracle Corp. The home page is on the Oracle Technology Network.

Node-oracledb supports:

• Promises, Callbacks and Streams
• SQL and PL/SQL execution
• REF CURSORs
• Large Objects: CLOBs and BLOBs
• Oracle Database 12.1 JSON datatype
• Query results as JavaScript objects or arrays
• Smart mapping between JavaScript and Oracle types with manual override available
• Data binding using JavaScript objects or arrays
• Transaction Management
• Inbuilt Connection Pool with Queueing
• Database Resident Connection Pooling (DRCP)
• External Authentication
• Row Prefetching
• Statement Caching
• Client Result Caching
• End-to-end Tracing, Mid-tier Authentication, and Auditing
• Oracle High Availability Features
  • Fast Application Notification (FAN)
  • Runtime Load Balancing (RLB)
  • Transparent Application Failover (TAF)

Various Oracle Database and Oracle Client versions, can be used. Oracle's cross-version compatibility allows one node-oracledb installation to connect to different database versions.

We are actively working on supporting the best Oracle Database features, and on functionality requests from users involved in the project.

Installation

Prerequisites:

• Python 2.7
• C Compiler with support for C++ 11 (Xcode, gcc, Visual Studio or similar)
• The small, free Oracle Instant Client "basic" and "SDK" packages if your database is remote. Or use the libraries and headers from a locally installed database such as the free Oracle XE release
• Set OCI_LIB_DIR and OCI_INC_DIR during installation if the Oracle libraries and headers are in a non-default location

Run npm install oracledb to install from the NPM registry.

See INSTALL for details.

Examples

There are examples in the examples directory.

A simple query example with callbacks:

var oracledb = require('oracledb');

oracledb.getConnection(
  {
    user          : "hr",
    password      : "welcome",
    connectString : "localhost/XE"
  },
  function(err, connection)
  {
    if (err) { console.error(err.message); return; }

    connection.execute(
      "SELECT department_id, department_name " +
        "FROM departments " +
        "WHERE manager_id < :id",
      [110],  // bind value for :id
      function(err, result)
      {
        if (err) { console.error(err.message); return; }
        console.log(result.rows);
      });
  });

With Oracle's sample HR schema, the output is:

[ [ 60, 'IT' ], [ 90, 'Executive' ], [ 100, 'Finance' ] ]

Node Promises can also be used.

Documentation

See Documentation for the Oracle Database Node.js Add-on.

Help

Issues and questions can be raised with the node-oracledb community on GitHub.

Changes

See CHANGELOG.

Tests

To run the test suite see test/README.

Contributing

Node-oracledb is an open source project. See CONTRIBUTING for details.

Oracle gratefully acknowledges the contributions to node-oracledb that have been made by the community.

License

Copyright (c) 2015, 2016, 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.