像javascript库这样的sql可与数组和对象一起使用

Question

I have to mess around with several csv files in node, to produce new csv files (selecting, joining, grouping, etc).

It's fairly easy to accomplish it all with lodash's functions, but it all tends to be very verbose, and not so nice to maintain.

It could all be solved with a clear, nice, readable, self-documenting, sql statement.

So I'm looking for a library that would allow me to work with a couple of arrays of objects, treat them like tables, apply a sql statement, and get the resulting array ob objects.

Is there something like that?

Answer 1

Yes of course. As the saying goes, there are 1000 ways to skin a cat. Have a look at the following libraries.

http://www.jinqjs.com https://linqjs.codeplex.com

Here's an example query:

var people = [
              {Name: 'Jane', Age: 20, Location: 'Smithtown'},
              {Name: 'Ken', Age: 57, Location: 'Islip'},
              {Name: 'Tom', Age: 10, Location: 'Islip'}
            ];

var population = [
              {Location: 'Islip', People: 123},
              {Location: 'Melville', People: 332},
            ];

var result = new jinqJs()
    .from(people)
    .leftJoin(population)
      .on( function( left, right ) {
        return (left.Location === right.Location);
      } )
    .where( function(row) {
      return ( row.Age > 15);
    })
    .select('Name', 'Location', 'People');