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A node.js binding to MariaDB's non-blocking (MySQL-compatible) client library

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README.md

Description

A node.js binding to MariaDB's non-blocking (MySQL-compatible) client library.

This binding is different from other vanilla libmysqlclient bindings in that it uses the non-blocking functions available in MariaDB's client library.

Therefore, this binding does not use multiple threads to achieve non-blocking behavior.

This binding has been tested on Windows, Linux, and Mac (OSX 10.6).

Requirements

Install

npm install mariasql

Examples

  • Simple query to retrieve a list of all databases:
var inspect = require('util').inspect;
var Client = require('mariasql');

var c = new Client();
c.connect({
  host: '127.0.0.1',
  user: 'foo',
  password: 'bar'
});

c.on('connect', function() {
   console.log('Client connected');
 })
 .on('error', function(err) {
   console.log('Client error: ' + err);
 })
 .on('close', function(hadError) {
   console.log('Client closed');
 });

c.query('SHOW DATABASES')
 .on('result', function(res) {
   res.on('row', function(row) {
     console.log('Query row: ' + inspect(row));
   })
   .on('error', function(err) {
     console.log('Query error: ' + inspect(err));
   })
   .on('end', function(info) {
     console.log('Query finished successfully');
   });
 })
 .on('end', function() {
  console.log('Done with all queries');
 });

c.end();
  • Abort the second query when doing multiple statements
var inspect = require('util').inspect;
var Client = require('mariasql');

var c = new Client(), qcnt = 0;
c.connect({
  host: '127.0.0.1',
  user: 'foo',
  password: 'bar',
  multiStatements: true
});

c.on('connect', function() {
   console.log('Client connected');
 })
 .on('error', function(err) {
   console.log('Client error: ' + err);
 })
 .on('close', function(hadError) {
   console.log('Client closed');
 });

c.query('SELECT "first query"; SELECT "second query"; SELECT "third query"', true)
 .on('result', function(res) {
   if (++qcnt === 2)
     res.abort();
   res.on('row', function(row) {
     console.log('Query #' + (qcnt) + ' row: ' + inspect(row));
   })
   .on('error', function(err) {
     console.log('Query #' + (qcnt) + ' error: ' + inspect(err));
   })
   .on('abort', function() {
     console.log('Query #' + (qcnt) + ' was aborted');
   })
   .on('end', function(info) {
     console.log('Query #' + (qcnt) + ' finished successfully');
   });
 })
 .on('end', function() {
  console.log('Done with all queries');
 });

c.end();

/* output:
    Client connected
    Query #1 row: [ 'first query' ]
    Query #1 finished successfully
    Query #2 was aborted
    Query #3 row: [ 'third query' ]
    Query #3 finished successfully
    Done with all queries
    Client closed
 */

API

require('mariasql') returns a Client object

Client properties

  • connected - <boolean> - Set to true if the Client is currently connected.

  • threadId - <string> - If connected, this is the thread id of this connection on the server.

Client events

  • connect() - Connection and authentication with the server was successful.

  • error(<Error>err) - An error occurred at the connection level.

  • close(<boolean>hadError) - The connection was closed. hadError is set to true if this was due to a connection-level error.

Client methods

  • (constructor)() - Creates and returns a new Client instance.

  • connect(<object>config) - (void) - Attempts a connection to a server using the information given in config:

    • user - <string> - Username for authentication. Default: (*nix: current login name, Windows: ???)

    • password - <string> - Password for authentication. Default: (blank password)

    • host - <string> - Hostname or IP address of the MySQL/MariaDB server. Default: "localhost"

    • port - <integer> - Port number of the MySQL/MariaDB server. Default: 3306

    • multiStatements - <boolean> - Allow multiple statements to be executed in a single "query" (e.g. connection.query('SELECT 1; SELECT 2; SELECT 3')) on this connection. Default: false

    • db - <string> - A database to automatically select after authentication. Default: (no db)

    • connTimeout - <integer> - Number of seconds to wait for a connection to be made. Default: 10

    • secureAuth - <boolean> - Use password hashing available in MySQL 4.1.1+ when authenticating. Default: true

    • compress - <boolean> - Use connection compression? Default: false

    • ssl - <mixed> - If boolean true, defaults listed below and default ciphers will be used, otherwise it must be an object with any of the following valid properties: Default: false

      • key - <string> - Path to a client private key file in PEM format (if the key requires a passphrase and libmysqlclient was built with yaSSL (bundled Windows libraries are), an error will occur). Default: (none)

      • cert - <string> - Path to a client certificate key file in PEM format. Default: (none)

      • ca - <string> - Path to a file in PEM format that contains a list of trusted certificate authorities. Default: (none)

      • capath - <string> - Path to a directory containing certificate authority certificate files in PEM format. Default: (none)

      • cipher - <string> - A colon-delimited list of ciphers to use when connecting. Default: "ECDHE-RSA-AES128-SHA256:AES128-GCM-SHA256:RC4:HIGH:!MD5:!aNULL:!EDH" (if cipher is set to anything other than false or non-empty string)

      • rejectUnauthorized - <boolean> - If true, the connection will be rejected if the Common Name value does not match that of the host name. Default: false

  • query(<string>query[, <mixed>values[, <boolean>useArray=false]]) - <Results> - Enqueues the given query and returns a Results object. values can be an object or array containing values to be used when replacing placeholders in query (see prepare()). If useArray is set to true, then an array of field values are returned instead of an object of fieldName=>fieldValue pairs. (Note: using arrays performs much faster)

  • prepare(<string>query) - <function> - Generates a re-usable function for query when it contains placeholders (can be simple ? position-based or named :foo_bar1 placeholders or any combination of the two). In the case that the function does contain placeholders, the generated function is cached per-connection if it is not already in the cache (currently the cache will hold at most 30 prepared queries). The returned function takes an object or array and returns the query with the placeholders replaced by the values in the object or array.

  • escape(<string>value) - <string> - Escapes value for use in queries. This method requires a live connection.

  • end() - (void) - Closes the connection once all queries in the queue have been executed.

  • destroy() - (void) - Closes the connection immediately, even if there are other queries still in the queue.

  • isMariaDB() - <boolean> - Returns true if the remote server is MariaDB.

Client static methods

  • escape(<string>value) - <string> - Escapes value for use in queries. This method does not take into account character encodings.

Results events

  • result(<Query>res) - res represents the result of a single query.

  • abort() - The results were aborted (the 'end' event will not be emitted) by way of results.abort().

  • error(<Error>err) - An error occurred while processing this set of results (the 'end' event will not be emitted).

  • end() - All queries in this result set finished successfully.

Results methods

  • abort() - (void) - Aborts any remaining queries (if multiple statements are used) immediately if the queries are either currently queued or are (about to start) returning rows (if applicable). This is a passive abort, so if the current query is still being processed on the server side, the queries will not be aborted until the server finishes processing the current query (i.e. when rows are about to be returned for SELECT queries). In any case, you can always kill the currently running query early by executing "KILL QUERY client_threadId" from a separate connection (note: this query can be dangerous if modifying information without transactions).

Query events

  • row(<mixed>row) - row is either an object of fieldName=>fieldValue pairs or just an array of the field values (in either case, JavaScript nulls are used for MySQL NULLs), depending on how query() was called.

  • abort() - The query was aborted (the 'end' event will not be emitted) by way of query.abort().

  • error(<Error>err) - An error occurred while executing this query (the 'end' event will not be emitted).

  • end(<object>info) - The query finished successfully. info contains statistics such as 'affectedRows', 'insertId', and 'numRows.'

Query methods

  • abort() - (void) - Aborts query immediately if the query is either currently queued or is (about to start) returning rows (if applicable). If the query is still being processed on the server side, the query will not be aborted until the server finishes processing it (i.e. when rows are about to be returned for SELECT queries). In any case, you can always kill the currently running query early by executing "KILL QUERY client_threadId" from a separate connection (note: this query is dangerous if modifying information without transactions).

TODO

  • Auto-reconnect algorithm(s) ?

  • Method to change character set

  • Periodic ping to keep connection alive

  • API to execute "KILL QUERY client_threadId" easily

  • Possibly some other stuff I'm not aware of at the moment

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