alasql/test/test272.js

AlaSQL.js - JavaScript SQL database library for relational and graph data manipulation with support of localStorage, IndexedDB, and Excel

if(typeof exports === 'object') {
	var assert = require("assert");
	var alasql = require('..');
  var _ = require('lodash');
} else {
	__dirname = '.';
};


describe('Test 272 REMOVE columns', function() {

  it('0. Create database', function(done) {
    alasql('CREATE DATABASE test272;USE test272');
    done();    
  });


  it('1. Remove columns', function(done) {
    var data = [{a:1,b:10,c:100},{a:2,b:20,c:200},];
    var res = alasql('SELECT RECORDSET * REMOVE COLUMN c FROM ?',[data]);
    var colres = _.pluck(res.columns,"columnid");
    assert.deepEqual(colres,["a","b"]);
    done();    
  });

  it('2. Remove columns', function(done) {
    var data = [{a:1,b:10,c:100},{a:2,b:20,c:200},];
    var res = alasql('SELECT RECORDSET * REMOVE COLUMNS c FROM ?',[data]);
    var colres = _.pluck(res.columns,"columnid");
    assert.deepEqual(colres,["a","b"]);
    done();    
  });

  it('3. Remove columns LIKE', function(done) {
    var data = [{a:1,b1:10,b2:100},{a:2,b1:20,b2:200},];
    var res = alasql('SELECT RECORDSET * REMOVE COLUMNS LIKE "%b" FROM ?',[data]);
    var colres = _.pluck(res.columns,"columnid");
    assert.deepEqual(colres,["a"]);
    done();    
  });

  it('4. Remove multiple columns', function(done) {
    var data = [{a:1,b1:10,b2:100,c:1000, d:10000},{a:2,b1:20,b2:200,c:2000,d:20000},];
    var res = alasql('SELECT RECORDSET * REMOVE COLUMNS LIKE "%b",a,d FROM ?',[data]);
    var colres = _.pluck(res.columns,"columnid");
    assert.deepEqual(colres,["c"]);
    done();    
  });

  it('5. Remove columns from table', function(done) {
    alasql('CREATE TABLE one (a INT, b STRING, c INT)');
    alasql('INSERT INTO one VALUES (1,"One",10),(2,"Two",20),(3,"Three",30)')
    var res = alasql('SELECT RECORDSET * REMOVE COLUMN b FROM one');
    var colres = _.pluck(res.columns,"columnid");
    assert.deepEqual(colres,["a","c"]);
    done();    
  });

  it('99. Drop database', function(done) {
    alasql('DROP DATABASE test272');
    done();    
  });

});