architect-oracle-pool
architect oracle database connection pool
Last updated 2 months ago by jcreigno .
Apache License V2.0 · Repository · Bugs · Original npm · Tarball · package.json
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Expose a Oracle connection pool as architect plugin. Automaticaly returns connection to the pool after query.

Installation

npm install --save architect-oracle-pool

Config Format

module.exports = [{
    packagePath: "architect-oracle-pool",
    url: {
        user: 'scott',
        password: 'tiger',
        connectString: 'backend.local/X3PV7',
        poolMax: 10
    }
}];
  • url : Defines the oracle url to use for connection

Usage

Boot Architect :

var path = require('path');
var architect = require("architect");

var configPath = path.join(__dirname, "config.js");
var config = architect.loadConfig(configPath);

architect.createApp(config, function (err, app) {
    if (err) {
        throw err;
    }
    console.log("app ready");
});

Configure Architect with config.js :

module.exports = [{
    packagePath: "architect-oracle-pool",
    url: {
        user: 'scott',
        password: 'tiger',
        connectString: 'backend.local/PV7',
        poolMax: 10
    }
}, './routes'];

Consume oradb plugin in your ./routes/package.json :

{
  "name": "routes",
  "version": "0.0.1",
  "main": "index.js",
  "private": true,

  "plugin": {
    "consumes": ["oradb"]
  }
}

Eventually use Oracle connection in your routes ./routes/index.js :

module.exports = function setup(options, imports, register) {
    var rest = imports.rest;
    var db = imports.oradb;

    // register routes 
    rest.get('/hello/:name', function (req, res, next) {
        db.query('SELECT * FROM Users WHERE id=$1', [req.params.name], function(err, res){
            res.write("{'message':'hello," + res.rows[0].name + "'}");
            res.end();
        });
    });
    
    register();
};

Multiple pool configuration

This module supports multiple pools.

Here is how to define 2 different pools :

module.exports = [{
    packagePath: "architect-oracle-pool",
    first : {
    	url: {
            user: 'scott',
            password: 'tiger',
            connectString: 'backend1.local/PV7',
            poolMax: 10
        }
    },
	second : {
    	url: {
            user: 'scott',
            password: 'tiger',
            connectString: 'backend2.local/PV7',
            poolMax: 10
        }
    }
}];

This will create 2 properties (first and second) in the db object.

module.exports = function setup(options, imports, register) {
    var db = imports.oradb;
    db.first.connection(function (err, client) {
      client.query(/*...*/);
    });    
    register();
};

Configuration

  • url either a connection url or an object :
  • host : serveur hostname or ip
  • port : serveur port
  • user : username to login,
  • password : password to login,
  • database: database name,
  • application_name: a name to identify client,
  • validationQuery: a query to run to validate a connection

See Oracle createPool

API

The pool object (oradb) has the following methods :

connection

Retreive a connection from the pool. The method takes a callback as parameter. Once the connection is avaliable the callback is called with an :

  • err object if an error occured or null;
  • client the Oracle connection object;
  • done, the close method.

query

The query method let you directly query the database without worrying about the database connection. Behind the scene the method retreive a connection from the pool and close it afterward.

  • string text: the query text;
  • optional array parameters: the query parameters;
  • optional function callback : the function called when data is ready.

Once the data is ready the callback is fired with an :

  • err object if an error occured or null;
  • rows the result set.
module.exports = function setup(options, imports, register) {
    var db = imports.oradb;
    
    db.query('SELECT * from USERS', function (err, res) {
        res.rows.forEach(console.log);
    });
    //...
};

queryStream

The queryStream method let you directly query the database without worrying about the database connection. This method passes a stream to the callback instead of a resultset.

  • string text: the query text;
  • optional array parameters: the query parameters;
  • optional function callback : the function called when stream is ready.
  • returns: ReadableStream

Once the stream is ready the callback is fired with an :

  • err object if an error occured or null;
  • stream the result stream.
var JSONSteam = require('JSONStream');

module.exports = function setup(options, imports, register) {
    var db = imports.oradb;
    db.queryStream('SELECT * from USERS')
        .pipe(JSONSteam.stringify())
        .pipe(process.stdout);
    //...
};

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