I want to have a simple fetch routes in my node.js but my problem is I dont know how to access the other table in mysql
router.get('/fetch' , async (req,res)=>{
const allData= await ("The problem is here").findAll({})
res.json(allData)
})
I don't know what Model should I put there. I'm using sequelize btw
and here is the list of all my table in mysql
and this is the model available in my node.js
I would like to know if we can fetch a table model from MySql from Database, without defining all the properties.
I'm using Node.js ORM2
const orm = require('orm');
db.define('users', {
// donot want to specify all the properties/fields
});
Above users table has already been created in DB, so I just want to get that model and not create/specify all the properties in it.
We can do this with other ORM's like Objection.js - but can't change my current implementation.
Thanks in advance,
Unfortunately, you must define properties/fields while you are defining your Models. There aren't any other options.
I have a table in mysql database which consists of 3 columns: ID (int and primary key), name and surname (both are strings).
Now I created a model class in scala:
class Clients(
ID: Int,
NAME: String,
SURNAME: String
)
and in main function I have this code which connects me to db:
val db = Database.forConfig("scalaTest")
and my application.conf looks like this:
scalaTest = {
url = "jdbc:mysql://localhost/Scala1"
user = "root"
password = "mysql"
driver = com.mysql.jdbc.Driver
connectionPool = disabled
keepAliveConnection = true
}
And I am supposed to use slick framework to make connection between my scala program and database.
Now I am wondering if I created my model well, or should it look different? Also, I do not know how to connect my model class to database, I've seen few code samples (even the hello_slick_3.0 which is a demo of how to use slick for this purpose), but I did not understand those.
Any help would be appreciated.
You also need to define a table model. You can check a full fledged example here:
Gist for Slick 3.1.0 with scala.
The example is for H2(in memory database but slick abstracts the DB away. It's done exactly the same way for any underlying DB.
I am currently using juggling db with NodeJS for ORM. I now need to do some reporting, which involves joining data from several tables using arbitrary SQL with SUM and GROUP BY too. How would I do this using the jugglingdb framework, and get a list of objects containing data from several columns.
You can access to the query function from the mysql package using the adapter client:
var Schema = require('jugglingdb').Schema;
var schema = new Schema('mysql', {
// your config
});
schema.client.query('your very wild query', function(err, data) {
// data will be an Array of Objects if no error
});
Actually this is a direct call to the query function of node-mysql package
is there any easy way to change the database from mysql to mongoDB ?
or better any one suggest me good tutorial do it
is there any easy way to change the database from mysql to mongoDB ?
Method #1: export from MySQL in a CSV format and then use the mongoimport tool. However, this does not always work well in terms of handling dates of binary data.
Method #2: script the transfer in your language of choice. Basically you write a program that reads everything from MySQL one element at a time and then inserts it into MongoDB.
Method #2 is better than #1, but it is still not adequate.
MongoDB uses collections instead of tables. MongoDB does not support joins. In every database I've seen, this means that your data structure in MongoDB is different from the structure in MySQL.
Because of this, there is no "universal tool" for porting SQL to MongoDB. Your data will need to be transformed before it reaches MongoDB.
If you're using Ruby, you can also try: Mongify
It's a super simple way to transform your data from a RDBS to MongoDB without losing anything.
Mongify will read your mysql database, build a translation file for you and all you have to do is map how you want your data transformed.
It supports:
Auto updating IDs (to BSON ObjectID)
Updating referencing IDs
Type Casting values
Embedding tables into other documents
Before save filters (to allow changes to the data manually)
and much much more...
Read more about it at: http://mongify.com/getting_started.html
There is also a short 5 min video on the homepage that shows you how easy it is.
Here's what I did it with Node.js for this purpose:
var mysql = require('mysql');
var MongoClient = require('mongodb').MongoClient;
function getMysqlTables(mysqlConnection, callback) {
mysqlConnection.query("show full tables where Table_Type = 'BASE TABLE';", function(error, results, fields) {
if (error) {
callback(error);
} else {
var tables = [];
results.forEach(function (row) {
for (var key in row) {
if (row.hasOwnProperty(key)) {
if(key.startsWith('Tables_in')) {
tables.push(row[key]);
}
}
}
});
callback(null, tables);
}
});
}
function tableToCollection(mysqlConnection, tableName, mongoCollection, callback) {
var sql = 'SELECT * FROM ' + tableName + ';';
mysqlConnection.query(sql, function (error, results, fields) {
if (error) {
callback(error);
} else {
if (results.length > 0) {
mongoCollection.insertMany(results, {}, function (error) {
if (error) {
callback(error);
} else {
callback(null);
}
});
} else {
callback(null);
}
}
});
}
MongoClient.connect("mongodb://localhost:27017/importedDb", function (error, db) {
if (error) throw error;
var MysqlCon = mysql.createConnection({
host: 'localhost',
user: 'root',
password: 'root',
port: 8889,
database: 'dbToExport'
});
MysqlCon.connect();
var jobs = 0;
getMysqlTables(MysqlCon, function(error, tables) {
tables.forEach(function(table) {
var collection = db.collection(table);
++jobs;
tableToCollection(MysqlCon, table, collection, function(error) {
if (error) throw error;
--jobs;
});
})
});
// Waiting for all jobs to complete before closing databases connections.
var interval = setInterval(function() {
if(jobs<=0) {
clearInterval(interval);
console.log('done!');
db.close();
MysqlCon.end();
}
}, 300);
});
MongoVUE's free version can do this automatically for you.
It can connect to both databases and perform the import
I think one of the easiest ways is to export the MySQL database to JSON and then use mongorestore to import it to a MongoDB database.
Step 1: Export the MySQL database to JSON
Load the mysql dump file into a MySQL database if necessary
Open MySQL Workbench and connect to the MySQL database
Go to the Schema viewer > Select database > Tables > right-click on the name of the table to export
Select 'Table Data Export Wizard'
Set the file format to .json and type in a filename such as tablename.json
Note: All tables will need to be exported individually
Step 2: Import the JSON files to a MongoDB using the mongorestore command
The mongorestore command should be run from the server command line (not the mongo shell)
Note that you may need to provide the authentication details as well as the --jsonArray option, see the mongorestore docs for more information
mongoimport -d dbname -u ${MONGO_USERNAME} -p ${MONGO_PASSWORD} --authenticationDatabase admin -c collectionname --jsonArray --file tablename.json
Note: This method will not work if the original MySQL database has BLOBs/binary data.
I am kind of partial to TalendOpenStudio for those kind of migration jobs. It is an eclipse based solution to create data migration "scripts" in a visual way. I do not like visual programming, but this is a problem domain I make an exception.
Adrien Mogenet has create a MongoDBConnection plugin for mongodb.
It is probably overkill for a "simple" migration but ut is a cool tool.
Mind however, that the suggestion of Nix will probably save you time if it is a one-of migration.
You can use QCubed (http://qcu.be) framework for that. The procedure would be something like this:
Install QCubed (http://www.thetrozone.com/qcubed-installation)
Do the codegen on your database. (http://www.thetrozone.com/php-code-generation-qcubed-eliminating-sql-hassle)
Take your database offline from the rest of the world so that only one operation runs at a time.
Now write a script which will read all rows from all tables of the database and use the getJson on all objects to get the json. You can then use the data to convert to array and push it into the mongoDB!
If anyone's still looking for a solution, i found that the easiest way is to write a PHP script to connect to your SQL DB, retrieve the information you want using the usual Select statement, transform the information into JSON using the PHP JSON Encode functions and simply output your results to file or directly to MongoDB. It's actually pretty simple and straight forward, the only thing to do is to double check your output against a Json validator, you may have to use functions such as explode to replace certain characters and symbols to make it valid. I have done this before however i currently do not have the script at hand but from what i can remember it was literally half a page of code.
Oh also remember Mongo is a document store so some data mapping is required to get it to be acceptable with mongo.
For those coming to this with the same problem, you can check out this Github project. This is an ongoing development that will help you migrate data from MySQL database to MongoDB by simply running a simple command.
It will generate MongoDB Schemas in TypeScript so you can use them later in your project. Each MySQL table will be a MongoDB collection, and datatypes will be efficiently converted to their MongoDB compatibles.
The documentation for the same can be found in the project's README.md. Feel free to come in and contribute. Would like to help if need be.
If you are looking for a tool to do it for you, good luck.
My suggestion is to just pick your language of choice, and read from one and write to another.
If I could quote Matt Briggs (it solved my roblem one time):
The driver way is by FAR the most straight forward. The import/export tools are fantastic, but only if you are using them as a pair. You are in for a wild ride if your table includes dates and you try to export from the db and import into mongo.
You are lucky too, being in c#. We are using ruby, and have a 32million row table we migrated to mongo. Our ending solution was to craft an insane sql statement in postgres that output json (including some pretty kludgy things to get dates going properly) and piped the output of that query on the command line into mongoimport. It took an incredibly frustrating day to write, and is not the sort of thing that can ever really be changed.
So if you can get away with it, use ado.net with the mongo driver. If not, I wish you well :-)
(note that this is coming from a total mongo fanboi)
MySQL is very similar to other SQL databases, so I send You to the topić:
Convert SQL table to mongoDB document
You can use the following project.It requires solr like configuration file to be written.Its very simple and straight forward.
http://code.google.com/p/sql-to-mongo-importer/
Try this:
Automated conversion of MySQL dump to Mongo updates using simple r2n mappings.
https://github.com/virtimus/mysql2mongo