mongo-sql/helpers/query/columns.js

A mongo-like interface for sql generation, postgres-style

var queryBuilder  = require('../../lib/query-builder');
var helpers       = require('../../lib/query-helpers');
var utils         = require('../../lib/utils');

helpers.register('columns', function(columns, values, query){
  if (typeof columns != 'object') throw new Error('Invalid columns input in query properties');

  if (['insert', 'create-view'].indexOf(query.type) > -1){
    return '(' + columns.map(function(col){
      return utils.quoteObject( col );
    }).join(', ') + ')';
  }

  var output = "";

  if (Array.isArray(columns)){
    for (var i = 0, l = columns.length; i < l; ++i){
      if (typeof columns[i] == 'object' && 'type' in columns[i] && !('expression' in columns[i]))
        output += '(' + queryBuilder( columns[i], values ).toString() + ')';
      else if (typeof columns[i] == 'object' && 'expression' in columns[i])
        output += queryBuilder( columns[i], values ).toString();
      else if (typeof columns[i] == 'object')
        output += utils.quoteObject(columns[i].name, columns[i].table || query.__defaultTable);
      else if (columns[i].indexOf('(') > -1)
        output += columns[i];
      else
        output += utils.quoteObject(columns[i], query.__defaultTable);

      if ( typeof columns[i] == 'object' && ('as' in columns[i] || 'alias' in columns[i]))
        output += ' as "' + (columns[i].as || columns[i].alias) + '"';

      output += ", ";
    }
  } else {
    for (var key in columns){
      if (key.indexOf('(') > -1)
        output += key + ', ';
      else
        output += (
          typeof columns[key] == 'object' && ('table' in columns[key])
        ) ? '(' + queryBuilder( columns[key], values ).toString() + ') as "' + key + '", '
          : typeof columns[key] == 'object' && ('type' in columns[key]) ?
            queryBuilder( columns[key], values ).toString() + ' as "' + key + '", ' :
            utils.quoteObject(key, query.__defaultTable) + ' as "' + columns[key] + '", ';
    }
  }

  if (output.length > 0) output = output.substring(0, output.length - 2);

  return output;
});