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node-mysql-wrapper
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2.9.3 • Public • Published

Node.js Version npm version

node-mysql-wrapper

nodets:mysql for meteor

NEW mysql-live for live database collections, server and client side!

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Table of Contents

Install

$ npm install node-mysql-wrapper

Sometimes I may also ask you to install the latest version from Github to check if a bugfix is working. In this case, please do:

$ npm install nodets/node-mysql-wrapper

Introduction

This is a node.js wrapper for node-mysql driver package. It is written in TypeScript, does not require compiling (all JavaScript files you need are inside the 'compiled' folder).

Here is an example on how to use it:

var mysql      = require('mysql');
var connection = mysql.createConnection({
  host     : 'localhost',
  user     : 'me',
  password : 'secret',
  database : 'my_db'
});
 
var wrapper = require('node-mysql-wrapper'); 
var db = wrapper.wrap(connection);
 
/* ES6: */
import {wrap} from "node-mysql-wrapper";
let db = wrap(connection);
/* END ES6*/
 
//or (without need of require mysql module) ->
//var db = wrapper.wrap("mysql://user:pass@127.0.0.1/databaseName?debug=false&charset=utf8");
 
db.ready(function(){
    //your code goes here	
    //users -> an example table inside the database, just call it like property:
 
    db.table("users").findById(8,function(user){
        console.dir(user);
 
        //to destroy the whole connection, its events and its tables use: 
        db.destroy();
    
    }); //or using promises: findById(8).then(function(rowResults){...});
    
 
});

From this example, you can learn the following:

  • Every method you invoke on a table is queued and executed in asynchronous way, using callbacks and/or promises.
  • Closing the connection is done using destroy() which makes sure all remaining queries are executed before sending a quit packet to the mysql server.

Contributors

Thanks goes to the people who have contributed code to this module, see the GitHub Contributors page.

Community

If you'd like to discuss this module, or ask questions about it, please use one of the following:

Establishing connections

The recommended way to establish a wrapped-connection is this:

var wrapper =  require('node-mysql-wrapper');
var db = wrapper.wrap("mysql://user:pass@127.0.0.1/databaseName?debug=false&charset=utf8");
 
db.ready(function(){ 
 
});

However, a wrapped-connection can also be implicitly established by wrapping an existing mysql connection:

var mysql      = require('mysql');
var connection = mysql.createConnection({
  host     : 'localhost',
  user     : 'me',
  password : 'secret',
  database : 'my_db'
});
 
var wrapper =  require('node-mysql-wrapper');
var db = wrapper.wrap(connection);
 
db.ready(function(){
 
});

Depending on how you like to code, either method may be appropriate. But in order to works always use .ready and a callback inside it.

Connection options

Read them at the node-mysql module documentation

Terminating connections

There are two ways to end a connection. Terminating a connection gracefully is done by calling the end() method:

db.end(function(err) {
  // The connection, table events and queries are terminated now
}); 
//Surely you can have a direct access to mysql connection from db.connection object, if you ever need it.

This will make sure all previously enqueued queries are still before sending a COM_QUIT packet to the MySQL server. If a fatal error occurs before the COM_QUIT packet can be sent, an err argument will be provided to the callback, but the connection will be terminated regardless of that.

An alternative way to end the connection is to call the destroy() method. This will cause an immediate termination of the underlying socket. Additionally destroy() guarantees that no more events or callbacks will be triggered for the connection.

db.destroy();

Unlike end() the destroy() method does not take a callback argument.

Tables

Manual select which tables you want to use. (default all)

 db.useOnly('users','comments',['or_an_array_of_tables','comment_likes']);
 //this goes before db.ready function.

Getting a table object

//all code you will see bellow goes inside db.ready(function () { //code here });
var usersTable = db.table("users"); //yes, just this :)
console.log('available columns: '+ usersTable.columns);
console.log('primary key column name: '+ usersTable.primaryKey);
console.log('find, findById, findAll, save and remove methods can be called from this table');
 
usersTable.find({mail:"= makis@omakis.com"},function(results){
 
});
 

Performing queries

Method queries

They are 4 types of method queries, the find/findById/findSingle,findAll (select), save (insert or update), remove. All values you pass there are auto-escaped to protect the database from sql injections.

All methods return promises.

Column keys are auto converted to object properties, this means that user_id column on database table will be available as userId, same for table names too.

Simple 'find by id' method , this find method always returns one result.

db.table("users").findById(18,function(user){
    console.log("SELECT * FROM users WHERE user_id = 18");
    console.dir(user);
});

Simple 'find single' method , this find method always returns one result.

db.table("users").findSingle({mail:'= makis@ideopod.com'},function(user){
    console.log("SELECT * FROM users WHERE mail = 'makis@ideopod.com' LIMIT 1");
    console.dir(user);
});

Simple 'find by' method this find method always returns an array.

db.table("users").find({yearsOld:'>= 18'},function(users){
    console.log("SELECT * FROM users WHERE yearsOld >= 18. results: ";
    console.dir(users);
});

Simple 'find all' method , which is the same as db.table("tablename").find({},callback); or .find({ tableRules : { limit :42 }} if rules passed.

db.table("users").findAll({limit :42}).then(function(users){ 
    console.log("SELECT * FROM users LIMIT 42. results: ");
    console.dir(users);
});

An 'advanced find' method. Find all users where years_old = 22, find the user's info, find user's comments, the comment's likes and users who liked them.

var dbUsers = db.table("users");
 
var criteria = dbUsers.criteria
.where("yearsOld").gt(18)
.exclude("password","createdDate") //or .except(...columns). Removes that column(s) from the select query. 
.joinAs("info","userInfos","userId").at("info").limit(1) 
//with.at('tableOrPropertyName') we are going and passing criterias inside the info property
//this will pass the the result as object not as array, because of limit(1)
.parent() // or .original() here will be redirect to parent object, ( user(s) table) to continue our query...
//original() goes to the first-original-primary table, parent() goes to the parent table, you can have unlimited .at('joinedTableOrProperty') functions.
.join("comments","userId")
.at("comments")
.orderBy("commentId",true) //true if you want desceding ( ORDER BY COLUMN_KEY DESC )
.joinAs("likes","commentLikes","commentId")
.at("likes")
.joinAs("likers","users","userId").build(); 
//In order to go to parent table use : parent(),
//to go to primary-first-iriginal table use .original(),
//.build() builds all in correct order so you don't need to call parent() in this case. 
 
// .build() makes that : 
/*
var criteria= {
    yearsOld:'= 22', //where
    info : {  //joined table
        userId : '=' , //'=' means: put the parent object's property's value.
        tableRules: {
            table:'userInfos',
            limit:1
        }
    },
    comments: { //another joined table with it's own joined tables also
        userId: '=',
        
        tableRules:{
            orderByDesc: "commentId" //ORDER BY comment_id DESC
        },
        
        likes: {
            commentId: '=', //foreign key is comment_id. Where it's value is from comment object's primary key's value.
            
            tableRules{ //NEW 
                table: "commentLikes" //use commentLikes tables as 'likes' property
            }
        
            users: {
                userId : '=' 
            }
        } 
    }
};
*/
 
dbUsers.find(criteria,function(results){
    console.log('A lot of queries executed here, you can guess them :)');
    console.dir(results);
});

Save method, Returns a single object, also updates the variable you pass into.

 
var newUser = { username: 'a new user', yearsOld: 23, mail: 'newmail@mail.com' };
 
db.table("users").save(newUser).then(function(result){ //if you want use a promise
    console.log('New user just created, new userId:'
    + result.userId+ ' which is the same as newUser.userId now:' +newUser.userId);
        
    result.username = 'an updated new username';	
    
    db.table("users").save(result,function(){
        console.log('User was just updated, because we have already a primary key setted at this object');
        
    });
        
});
 
 

Remove method .1

//remove/delete all rows from users table where years_old = 22
db.table("users").remove({yearsOld:'= 22'},function(resultAnswer){
    console.log(resultAnswer.affectedRows+ ' rows removed from '+resultAnswer.table);
});

Remove method .2 remove by id also

//remove/delete a single row by its primary key
db.table("users").remove(4,function(results){
    console.log('we were just deleted a user with userId(user_id) = 4');
});

Also you can wait for multiple query methods to finish before you do something using db.when method:

var findAUser = db.table("users").findById(16);
var findMoreUsers = db.table("users").find({username: '= a username'});
var findSomeComments = db.table("comments").find({userId:'= 16'});
 
//you can pass an array of promises too.
db.when(findAUser,findMoreUsers,findSomeComments).then(function(results) {
    /*
results -> results[0] -> findAUser (one object) , results[1]->findMoreUsers (array) results  , results[2] ->findSomeComments (array) results.
    */
 
});

Plain queries - the module's purpose is to never need to use this way.

To perform a plain custom query call the .query() method on a wrapped-db object.

The simplest form of .query() is .query(sqlString, callback), where a SQL string is the first argument and the second is a callback:

db.query('SELECT * FROM `users` WHERE `user_id` = 18', function (error, results) {
  // error will be an Error if one occurred during the query
  // results will contain the results of the query
});

( to escape a value here just use db.connection.escape(value) )

Stored procedures

You can call stored procedures from your queries as with any other mysql driver. If the stored procedure produces several result sets, they are exposed to you the same way as the results for multiple statement queries.

Make sure you create connection or wrap a connection with multipleStatements flag set to true: var db = wrap({ user: 'kataras', password: 'mypass', database: 'test', multipleStatements: true});

//first way: 
var myParams = "'arg1', 'arg2', ... ";
myParams.map(function(arg){ return db.connection.escape(arg);});
 
db.query("CALL MyStoredProcedure(" + myParams + ")", function(err, results, fields) {
    if (err || results[0].res === 0) {
        throw new Error("Error ... ");
    } else {
        // Stuff...
 
    }
});
 
//second way, recommended:
var myParams = [];
myParams.push('arg1');
myparams.push('arg2');
 
 
try{
  
  db.call('MyStoredProcedure', myParams, function(results, fields) { //arg1,arg2 here are auto-escaping.
    console.log('Results returned: ',results);
  });
  
}catch(ex){
  console.log('Error info: ',ex);
}
 
 

Table events

on /watch

Each method/query will emit a table event when a new type of query executed and parsed. If you need to log or test results on the table before it gets used, you can listen to these events: insert, update, remove (or delete) and save( for both insert and update) .

Note: Events are always executed before callbacks or promises.

//users -> an example table on a database, call it like a normal function
var usersInsertWatcher = function(parsedInsertedRows){
    console.log('Somewhere an insert query executed on USERS table : ');
    console.dir(parsedInsertedRows);
};
 
var usersRemoveWatcher = function(deleted){
    console.log('Somewhere a remove/delete query executed on USERS table : ');
    console.log('Affected rows number: '+ deleted.affectedRows);
};
 
db.table("users").on('insert',usersInsertWatcher);
db.table("users").on('remove',usersRemoveWatcher); //and so on...

off /unwatch

To turn off an event on a table just call db.table("tablename").off('event_type',the_callback_variable_to_remove)

db.table("users").off('insert',usersInsertWatcher);
db.table("users").off('remove',usersRemoveWatcher);

Extending a table

Any table can be extending to your own custom needs, with custom method queries, using this syndax:

db.table("tablename").extend('functionName',theFunction);

An example is always better, let's suppose that we have a users table with some columns, one of these columns is the 'mail' column, and we want to find if a user exists with a mail in our users table. Ofcourse we could use the already find method, but just for example purpose:

 
if(db.table("users").has('mailExists') === false) //not necessary
{
    db.table("users").extend('mailExists',function(mail,callback){
    //this = the users table, so this.name = 'users'
    var q= "SELECT COUNT(*) FROM " + this.name + " WHERE mail = " + 
    db.connection.escape(mail);
        
        db.query(q, function (err, results) {
            if (!err && results.length > 0 && results[0]["COUNT(*)"] > 0) {
                 callback(true);
                } else {
                  callback(false);
            }
       });
    });
 
}

Use an extended method is simple

    db.table("users").mailExists('an_e-mail@mail.com',function(exists){
        if(exists) console.log('this mail already exists!');
        else console.log('this mail doesnt exists.');
    });

Watch database changes

Enable Binary Logging

First of all you have to enable binary logs in your MySQL Server, In most of the cases this is enabled by default, but if not I will explain you how to enable it.

IF MYSQL SERVER VERSION IS GREATER OR EQUAL THAN 5.7 follow this:

  IF OS === Windows 
    IF (MYSQL INSIDE xampp,wamp) 
        1. Open: C:/ xampp/ OR wamp/ mysql/YOUR_MYSQL_VERSION/my.ini 
    ELSE  
        1. Open explorer and write : %PROGRAMDATA%/MySQL/MySQL Server 5.7/my.ini
        
    2. Go to the lines(119-120) which you can see these contents: 
      # Binary Logging.
      # log-bin
    3. Just uncomment the # log-bin, finall result must look like that:
      # Binary Logging.
      log-bin
      								
    4. Restart the mysql server service and you are ready.

 ELSE IF OS === (L)Unix
    IF (MYSQL INSIDE lampp) 
        1. Open explorer and open opt/lampp/etc/my.cnf
    ELSE  
        1. Find where is my.cnf using these one of these shell commands: 
            locate my.cnf
            whereis my.cnf
            find . -name my.cnf
            
           and open the my.cnf file.
        
   2. Go to the line(119-120) which you can see these contents: 
      # Binary Logging.
      # log-bin
   3. Just uncomment the # log-bin, finall result must look like that:
      # Binary Logging.
      log-bin
      								
   4. Restart the mysql server service and you are ready. 

ELSE IF MYSQL SERVER VERSION IS LESS OR EQUAL THAN 5.6
    Watch on youtube this video: https://www.youtube.com/watch?v=xrTBFZyn-Bk

Example

This package supports BASIC live watch of your database changes, make use of ObservableCollection.

var usersCollection = db.collection("users",function(){
    //ready
    
    usersCollection.onCollectionChanged(function(event,oldItems,newItems,oldStartingIndex,newStartingIndex){
      //event has 3 times of events
      //INSERT,UPDATE,REMOVE
      //your code here
    });
});
 

For full support and the best experience you evern seen, take a look at nodets/node-mysql-live package.

Running tests

Import this database example to your local server, and have fan!

 
SET FOREIGN_KEY_CHECKS=0;
 
-- ---------------------------- 
-- Table structure for comments 
-- ---------------------------- 
DROP TABLE IF EXISTS `comments`;
CREATE TABLE `comments` (
  `comment_id` int(11) NOT NULL AUTO_INCREMENT,
  `content` varchar(255) DEFAULT NULL,
  `user_id` int(11) DEFAULT NULL,
  PRIMARY KEY (`comment_id`)
) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8;
 
-- ---------------------------- 
-- Records of comments 
-- ---------------------------- 
INSERT INTO `comments` VALUES ('1', 'dsadsadsa', '18');
INSERT INTO `comments` VALUES ('2', 'wqewqewqeq', '18');
INSERT INTO `comments` VALUES ('3', 'cxxzczxczcz', '22');
INSERT INTO `comments` VALUES ('4', 'e comment belongs to 23 usersa', '23');
 
-- ---------------------------- 
-- Table structure for comment_likes 
-- ---------------------------- 
DROP TABLE IF EXISTS `comment_likes`;
CREATE TABLE `comment_likes` (
  `comment_like_id` int(11) NOT NULL AUTO_INCREMENT,
  `user_id` int(11) DEFAULT NULL,
  `comment_id` int(11) DEFAULT NULL,
  PRIMARY KEY (`comment_like_id`)
) ENGINE=InnoDB AUTO_INCREMENT=10 DEFAULT CHARSET=utf8;
 
-- ---------------------------- 
-- Records of comment_likes 
-- ---------------------------- 
INSERT INTO `comment_likes` VALUES ('1', '18', '1');
INSERT INTO `comment_likes` VALUES ('3', '18', '2');
INSERT INTO `comment_likes` VALUES ('4', '12', '1');
INSERT INTO `comment_likes` VALUES ('5', '16', '3');
INSERT INTO `comment_likes` VALUES ('6', '18', '4');
INSERT INTO `comment_likes` VALUES ('7', '16', '4');
INSERT INTO `comment_likes` VALUES ('8', '16', '3');
INSERT INTO `comment_likes` VALUES ('9', '18', '3');
 
-- ---------------------------- 
-- Table structure for users 
-- ---------------------------- 
DROP TABLE IF EXISTS `users`;
CREATE TABLE `users` (
  `user_id` int(11) NOT NULL AUTO_INCREMENT,
  `mail` varchar(255) DEFAULT NULL,
  `username` varchar(255) DEFAULT NULL,
  `password` varchar(255) DEFAULT NULL,
  `created_date` timestamp NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  `years_old` int(11) DEFAULT '0',
  PRIMARY KEY (`user_id`)
) ENGINE=InnoDB AUTO_INCREMENT=5624 DEFAULT CHARSET=utf8;
 
-- ---------------------------- 
-- Records of users 
-- ---------------------------- 
INSERT INTO `users` VALUES ('16', 'an updated username for user_id 30  or 30 2nd time', 'an updated x username 1nd time', 'ewqeq', '2015-08-09 03:55:34', '21');
INSERT INTO `users` VALUES ('18', 'an updated mail for user id 18 2nd time', 'an updated username for user_id 18 3rd time', 'a pass', '2015-08-08 22:58:49', '55');
INSERT INTO `users` VALUES ('19', 'updated19@omakis.com', 'an 19 username', 'a pass', '2015-08-08 22:38:19', '22');
INSERT INTO `users` VALUES ('20', 'mail20_updated@omakis.com', 'an updated20 username', 'a pass', '2015-08-08 22:58:48', '15');
INSERT INTO `users` VALUES ('22', 'mail22@omakis.com', 'a username', 'a passing', '2015-08-08 22:38:13', '22');
INSERT INTO `users` VALUES ('23', 'mailwtf@dsadsa.com', 'a username', 'pass', '2015-08-08 22:38:16', '22');
INSERT INTO `users` VALUES ('28', 'an updated username for user_id 28  or 283rd time', 'an updated x username 2nd time', 'ewqewq', '2015-08-08 22:58:44', '15');
INSERT INTO `users` VALUES ('31', 'an updated username for user_id 31  or 31 2nd time', 'an updated x username 1nd time', 'dsadsada', '2015-08-09 03:55:32', '0');
INSERT INTO `users` VALUES ('5618', 'special@email.com', 'a special username', null, '2015-08-13 06:32:07', '23');
 
-- ---------------------------- 
-- Table structure for user_infos 
-- ---------------------------- 
DROP TABLE IF EXISTS `user_infos`;
CREATE TABLE `user_infos` (
  `user_info_id` int(11) NOT NULL AUTO_INCREMENT,
  `user_id` int(11) DEFAULT NULL,
  `hometown` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`user_info_id`)
) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8;
 
-- ---------------------------- 
-- Records of user_infos 
-- ---------------------------- 
INSERT INTO `user_infos` VALUES ('1', '18', 'athens');
INSERT INTO `user_infos` VALUES ('3', '22', '22 user hometown');
INSERT INTO `user_infos` VALUES ('4', '23', '23 user hometown');
 

Todo

  • Waiting for stable yield/*async support

Licence

This project is licensed under the MIT license.

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