claviz-node-firebird

v2.0.1

Published

7 months ago

Pure JavaScript and Asynchronous Firebird client for Node.js.

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jansivans

firebird database rdbms sql

Pure JavaScript and Asynchronous Firebird client for Node.js

Firebird forum on Google Groups.

Firebird database on social networks

Changelog for version v0.2.x

added auto-reconnect
added sequentially selects
events for connection (attach, detach, row, result, transaction, commit, rollback, error, etc.)
performance improvements
supports inserting/updating buffers and streams
reading blobs (sequentially)
pooling
database.detach() waits for last command
better unit-test

Installation

npm install node-firebird

Usage

var Firebird = require('node-firebird');

Methods

Firebird.escape(value) -> return {String} - prevent for SQL Injections
Firebird.attach(options, function(err, db)) attach a database
Firebird.create(options, function(err, db)) create a database
Firebird.attachOrCreate(options, function(err, db)) attach or create database
Firebird.pool(max, options) -> return {Object} create a connection pooling

Connection types

Connection options

var options = {};

options.host = '127.0.0.1';
options.port = 3050;
options.database = 'database.fdb';
options.user = 'SYSDBA';
options.password = 'masterkey';
options.lowercase_keys = false; // set to true to lowercase keys
options.role = null;            // default
options.pageSize = 4096;        // default when creating database
options.pageSize = 4096;        // default when creating database
options.retryConnectionInterval = 1000; // reconnect interval in case of connection drop
options.blobAsText = false; // set to true to get blob as text, only affects blob subtype 1
options.encoding = 'UTF-8'; // default encoding for connection is UTF-8

Classic

Firebird.attach(options, function(err, db) {

    if (err)
        throw err;

    // db = DATABASE
    db.query('SELECT * FROM TABLE', function(err, result) {
        // IMPORTANT: close the connection
        db.detach();
    });

});

Pooling

// 5 = the number is count of opened sockets
var pool = Firebird.pool(5, options);

// Get a free pool
pool.get(function(err, db) {

    if (err)
        throw err;

    // db = DATABASE
    db.query('SELECT * FROM TABLE', function(err, result) {
        // IMPORTANT: release the pool connection
        db.detach();
    });
});

// Destroy pool
pool.destroy();

Database object (db)

Database Methods

db.query(query, [params], function(err, result)) - classic query, returns Array of Object
db.execute(query, [params], function(err, result)) - classic query, returns Array of Array
db.sequentially(query, [params], function(row, index), function(err)) - sequentially query
db.detach(function(err)) detach a database
db.transaction(isolation, function(err, transaction)) create transaction

Transaction methods

transaction.query(query, [params], function(err, result)) - classic query, returns Array of Object
transaction.execute(query, [params], function(err, result)) - classic query, returns Array of Array
transaction.commit(function(err)) commit current transaction
transaction.rollback(function(err)) rollback current transaction

Examples

Parametrized Queries

Parameters

Firebird.attach(options, function(err, db) {

    if (err)
        throw err;

    // db = DATABASE
    db.query('INSERT INTO USERS (ID, ALIAS, CREATED) VALUES(?, ?, ?) RETURNING ID', [1, 'Pe\'ter', new Date()], function(err, result) {
        console.log(result[0].id);
        db.query('SELECT * FROM USERS WHERE Alias=?', ['Peter'], function(err, result) {
            console.log(result);
            db.detach();
        });
    });
});

BLOB (stream)

Firebird.attach(options, function(err, db) {

    if (err)
        throw err;

    // db = DATABASE
    // INSERT STREAM as BLOB
    db.query('INSERT INTO USERS (ID, ALIAS, FILE) VALUES(?, ?, ?)', [1, 'Peter', fs.createReadStream('/users/image.jpg')], function(err, result) {
        // IMPORTANT: close the connection
        db.detach();
    });
});

BLOB (buffer)

Firebird.attach(options, function(err, db) {

    if (err)
        throw err;

    // db = DATABASE
    // INSERT BUFFER as BLOB
    db.query('INSERT INTO USERS (ID, ALIAS, FILE) VALUES(?, ?, ?)', [1, 'Peter', fs.readFileSync('/users/image.jpg')], function(err, result) {
        // IMPORTANT: close the connection
        db.detach();
    });
});

Reading Blobs (Asynchronous)

Firebird.attach(options, function(err, db) {

    if (err)
        throw err;

    // db = DATABASE
    db.query('SELECT ID, ALIAS, USERPICTURE FROM USER', function(err, rows) {

        if (err)
            throw err;

        // first row
        rows[0].userpicture(function(err, name, e) {

            if (err)
                throw err;

            // +v0.2.4
            // e.pipe(writeStream/Response);

            // e === EventEmitter
            e.on('data', function(chunk) {
                // reading data
            });

            e.on('end', function() {
                // end reading
                // IMPORTANT: close the connection
                db.detach();
            });
        });

    });
});

Reading Multiples Blobs (Asynchronous)

Firebird.attach(options, (err, db) => {
    if (err)
        throw err;

    db.transaction(Firebird.ISOLATION_READ_COMMITTED, (err, transaction) => {
        if (err) {
            throw err;
        }

        transaction.query('SELECT FIRST 10 * FROM JOB', (err, result) => {
            if (err) {
                transaction.rollback();
                return;
            }

            const arrBlob = [];
            for (const item of result) {
                const fields = Object.keys(item);
                for (const key of fields) {
                    if (typeof item[key] === 'function') {
                        item[key] = new Promise((resolve, reject) => {
                            // the same transaction is used (better performance)
                            // this is optional
                            item[key](transaction, (error, name, event, row) => {
                                if (error) {
                                    return reject(error);
                                }

                                // reading data
                                let value = '';
                                event.on('data', (chunk) => {
                                    value += chunk.toString('binary');
                                });
                                event.on('end', () => {
                                    resolve({ value, column: name, row });
                                });
                            });
                        });
                        arrBlob.push(item[key]);
                    }
                }
            }

            Promise.all(arrBlob).then((blobs) => {
                for (const blob of blobs) {
                    result[blob.row][blob.column] = blob.value;
                }

                transaction.commit((err) => {
                    if (err) {
                        transaction.rollback();
                        return;
                    }

                    db.detach();
                    console.log(result);
                });
            }).catch((err) => {
                transaction.rollback();
            });
        });
    });
});

Streaming a big data

Firebird.attach(options, function(err, db) {

    if (err)
        throw err;

    // db = DATABASE
    db.sequentially('SELECT * FROM BIGTABLE', function(row, index) {

        // EXAMPLE
        stream.write(JSON.stringify(row));

    }, function(err) {
        // END
        // IMPORTANT: close the connection
        db.detach();
    });
});

Transactions

Transaction types:

Firebird.ISOLATION_READ_UNCOMMITTED
Firebird.ISOLATION_READ_COMMITTED
Firebird.ISOLATION_REPEATABLE_READ
Firebird.ISOLATION_SERIALIZABLE
Firebird.ISOLATION_READ_COMMITTED_READ_ONLY

Firebird.attach(options, function(err, db) {

    if (err)
        throw err;

    // db = DATABASE
    db.transaction(Firebird.ISOLATION_READ_COMMITTED, function(err, transaction) {
        transaction.query('INSERT INTO users VALUE(?,?)', [1, 'Janko'], function(err, result) {

            if (err) {
                transaction.rollback();
                return;
            }

            transaction.commit(function(err) {
                if (err)
                    transaction.rollback();
                else
                    db.detach();
            });
        });
    });
});

Events

Firebird.attach(options, function(err, db) {

    if (err)
        throw err;

    db.on('row', function(row, index, isObject) {
        // index === Number
        // isObject === is row object or array?
    });

    db.on('result', function(result) {
        // result === Array
    });

    db.on('attach', function() {

    });

    db.on('detach', function(isPoolConnection) {
        // isPoolConnection == Boolean
    });

    db.on('reconnect', function() {

    });

    db.on('error', function(err) {

    });

    db.on('transaction', function(isolation) {
        // isolation === Number
    });

    db.on('commit', function() {

    });

    db.on('rollback', function() {

    });

    db.detach();
});

Escaping Query values

var sql1 = 'SELECT * FROM TBL_USER WHERE ID>' + Firebird.escape(1);
var sql2 = 'SELECT * FROM TBL_USER WHERE NAME=' + Firebird.escape('Pe\'er');
var sql3 = 'SELECT * FROM TBL_USER WHERE CREATED<=' + Firebird.escape(new Date());
var sql4 = 'SELECT * FROM TBL_USER WHERE NEWSLETTER=' + Firebird.escape(true);

// or db.escape()

console.log(sql1);
console.log(sql2);
console.log(sql3);
console.log(sql4);

Using GDS codes

var { GDSCode } = require('node-firebird/lib/gdscodes');
/*...*/
db.query('insert into my_table(id, name) values (?, ?)', [1, 'John Doe'],
    function (err) {
        if(err.gdscode == GDSCode.UNIQUE_KEY_VIOLATION){
            console.log('constraint name:'+ err.gdsparams[0]);
            console.log('table name:'+ err.gdsparams[0]);
            /*...*/
        }
        /*...*/
    });

Service Manager functions

backup
restore
fixproperties
serverinfo
database validation
commit transaction
rollback transaction
recover transaction
database stats
users infos
user actions (add modify remove)
get firebird file log
tracing

// each row : fctname : [params], typeofreturn
var fbsvc = {
    "backup" : { [ "options"], "stream" },
    "nbackup" : { [ "options"], "stream" },
    "restore" : { [ "options"], "stream" },
    "nrestore" : { [ "options"], "stream" },
    "setDialect": { [ "database","dialect"], "stream" },
    "setSweepinterval": { [ "database","sweepinterval"], "stream" },
    "setCachebuffer" : { [ "database","nbpagebuffers"], "stream" },
    "BringOnline" : { [ "database"], "stream" },
    "Shutdown" : { [ "database","shutdown","shutdowndelay","shutdownmode"], "stream" },
    "setShadow" : { [ "database","activateshadow"], "stream" },
    "setForcewrite" : { [ "database","forcewrite"], "stream" },
    "setReservespace" : { [ "database","reservespace"], "stream" },
    "setReadonlyMode" : { [ "database"], "stream" },
    "setReadwriteMode" : { [ "database"], "stream" },
    "validate" : { [ "options"], "stream" },
    "commit" : { [ "database", "transactid"], "stream" },
    "rollback" : { [ "database", "transactid"], "stream" },
    "recover" : { [ "database", "transactid"], "stream" },
    "getStats" : { [ "options"], "stream" },
    "getLog" : { [ "options"], "stream" },
    "getUsers" : { [ "username"], "object" },
    "addUser" : { [ "username", "password", "options"], "stream" },
    "editUser" : { [ "username", "options"], "stream" },
    "removeUser" : { [ "username","rolename"], "stream" },
    "getFbserverInfos" : { [ "options", "options"], "object" },
    "startTrace" : { [ "options"], "stream" },
    "suspendTrace" : { [ "options"], "stream" },
    "resumeTrace" : { [ "options"], "stream" },
    "stopTrace" : { [ "options"], "stream" },
    "getTraceList" : { [ "options"], "stream" },
    "hasActionRunning" : { [ "options"], "object"}
}

Backup Service example

const options = {...}; // Classic configuration with manager = true
Firebird.attach(options, function(err, svc) {
    if (err)
        return;
    svc.backup(
        {
            database:'/DB/MYDB.FDB',
            files: [
                    {
                     filename:'/DB/MYDB.FBK',
                     sizefile:'0'
                    }
                   ]
        },
        function(err, data) {
            data.on('data', line => console.log(line));
            data.on('end', () => svc.detach());
        }
    );
});

Restore Service example

const config = {...}; // Classic configuration with manager = true
const RESTORE_OPTS = {
    database: 'database.fdb',
    files: ['backup.fbk']
};

Firebird.attach(config, (err, srv) => {
    srv.restore(RESTORE_OPTS, (err, data) => {
        data.on('data', () => {});
        data.on('end', () =>
            srv.detach();
        });
    });
});

getLog and getFbserverInfos Service examples with use of stream and object return

fb.attach(_connection, function(err, svc) {
    if (err)
        return;
    // all function that return a stream take two optional parameter
    // optread => byline or buffer  byline use isc_info_svc_line and buffer use isc_info_svc_to_eof
    // buffersize => is the buffer for service manager it can't exceed 8ko (i'm not sure)

    svc.getLog({optread:'buffer', buffersize:2048}, function (err, data) {
            // data is a readablestream that contain the firebird.log file
            console.log(err);
            data.on('data', function (data) {
                console.log(data.toString());
            });
            data.on('end', function() {
                console.log('finish');
            });
        });

    // an other exemple to use function that return object
    svc.getFbserverInfos(
            {
            "dbinfo" : true,
            "fbconfig" : true,
            "svcversion" : true,
            "fbversion" : true,
            "fbimplementation" : true,
            "fbcapatibilities" : true,
            "pathsecuritydb" : true,
            "fbenv" : true,
            "fbenvlock" : true,
            "fbenvmsg" : true
        }, {}, function (err, data) {
            console.log(err);
            console.log(data);
        });
});

Charset for database connection is always UTF-8

node-firebird doesn't let you choose the charset connection, it will always use UTF-8. Node is unicode, no matter if your database is using another charset to store string or blob, Firebird will transliterate automatically.

This is why you should use Firebird 2.5 server at least.

Firebird 3.0 Support

Firebird new wire protocol is not supported yet so for Firebird 3.0 you need to add the following in firebird.conf according to Firebird 3 release notes https://firebirdsql.org/file/documentation/release_notes/html/en/3_0/rnfb30-security-new-authentication.html

AuthServer = Srp, Legacy_Auth
WireCrypt = Disabled
UserManager = Legacy_UserManager

Firebird 4 wire protocol is not supported yet so for Firebird 4.0 you need to add the following in firebird.conf according to Firebird release notes https://firebirdsql.org/file/documentation/release_notes/html/en/4_0/rlsnotes40.html#rnfb40-config-srp256

AuthServer = Srp256, Srp, Legacy_Auth
WireCrypt = Disabled
UserManager = Legacy_UserManager

Please read also Authorization with Firebird 2.5 client library from Firebird 4 migration guide https://ib-aid.com/download/docs/fb4migrationguide.html#_authorization_with_firebird_2_5_client_library_fbclient_dll

Contributors

Henri Gourvest, https://github.com/hgourvest
Popa Marius Adrian, https://github.com/mariuz
Peter Širka, https://github.com/petersirka