Creating json with RUBY looping through SQL Server table - json

Question

This is a followup to this question:
Ruby create JSON from SQL Server
I was able to create nested arrays in JSON. But I'm struggling with looping through records and appending a file with each record. Also how would I add a root element just at the top of the json and not on each record. "aaSequences" needs to be at the top just once... I also need a comma between each record.
here is my code so far
require 'pp'
require 'tiny_tds'
require 'awesome_print'
require 'json'
class Document
def initialize strategy
#document = strategy
#load helper functions
load "helpers_ruby.rb"
#set environment 'dev', 'qa', or 'production'
load "envconfig_ruby.rb"
end
def StartUP
#document.StartUP
end
def getseqrecord
#document.getseqrecord
end
end
class GetSqlaaSequence
def StartUP
##system "clear" ##linux
system "cls" ##Windows
# create connection to db
$connReportingDB = createReportingxxSqlConn($ms_sql_host, $ms_sql_user, $ms_sql_password, $ms_sql_dbname)
##$currentDateTime = DateTime.now
##pp 'def StartUP ran at: '+$currentDateTime.to_s
end
def getseqrecord
# get the aaaaSequences data
#result = $connReportingDB.execute("SELECT
[jsonFile]
,[id]
,[title]
,[authorIds]
,[name]
,[aminoAcids]
,[schemaId]
,[registryId]
,[namingStrategy]
FROM tablename
")
$aaSequences = Array.new
#i = 0
#result.each do |aaSequence|
jsonFile = aaSequence['jsonFile']
id = aaSequence['id']
title = aaSequence['title']
authorIds = aaSequence['authorIds']
name = aaSequence['name']
aminoAcids = aaSequence['aminoAcids']
schemaId = aaSequence['schemaId']
registryId = aaSequence['registryId']
namingStrategy = aaSequence['namingStrategy']
##end
#hash = Hash[
"jsonFile", jsonFile,
"id", id,
"title", title,
"authorIds", authorIds,
"name", name,
"aminoAcids", aminoAcids,
"schemaId", schemaId,
"registryId", registryId,
"namingStrategy", namingStrategy
]
#filename = jsonFile
jsonFileOutput0 = {:"#{title}" => [{:authorIds => ["#{authorIds}"],:aminoAcids => "#{aminoAcids}",:name => "#{name}",:schemaId => "#{schemaId}",:registryId => "#{registryId}",:namingStrategy => "#{namingStrategy}"}]}
jsonFileOutput = JSON.pretty_generate(jsonFileOutput0)
File.open(jsonFile,"a") do |f|
f.write(jsonFileOutput)
####ad the comma between records...Not sure if this is the best way to do it...
# File.open(jsonFile,"a") do |f|
# f.write(',')
# end
end
$aaSequences[#i] = #hash
#i = #i + 1
###createReportingSqlConn.close
end
end
end
Document.new(GetSqlaaSequence.new).StartUP
#get aaSequences and create json files
Document.new(GetSqlaaSequence.new).getseqrecord
here is a sample of the json it creates so far...
{
"aaSequences": [
{
"authorIds": [
"fff_fdfdfdfd"
],
"aminoAcids": "aminoAcids_data",
"name": "fdfdfddf-555_1",
"schemaId": "5555fdfd5",
"registryId": "5fdfdfdf",
"namingStrategy": "NEW_IDS"
}
]
}{
"aaSequences": [
{
"authorIds": [
"fff_fdfdfdfd"
],
"aminoAcids": "aminoAcids_data",
"name": "fdfdfddf-555_2",
"schemaId": "5555fdfd5",
"registryId": "5fdfdfdf",
"namingStrategy": "NEW_IDS"
}
]
}
and here is an example of what I need it to look like
{
"aaSequences": [
{
"authorIds": [
"authorIds_data"
],
"aminoAcids": "aminoAcids_data",
"name": "name_data",
"schemaId": "schemaId_data",
"registryId": "registryId_data",
"namingStrategy": "namingStrategy_data"
},
{
"authorIds": [
"authorIds_data"
],
"aminoAcids": "aminoAcids_data",
"name": "name_data",
"schemaId": "schemaId_data",
"registryId": "registryId_data",
"namingStrategy": "namingStrategy_data"
}
]
}

Answer 1

You can just do the whole thing in SQL using FOR JSON.
Unfortunately, arrays are not possible using this method. There are anumber of hacks, but the easiest one in your situation is to just append to [] using JSON_MODIFY
SELECT
authorIds = JSON_MODIFY('[]', 'append $', a.authorIds),
[aminoAcids],
[name],
[schemaId],
[registryId],
[namingStrategy]
FROM aaSequences a
FOR JSON PATH, ROOT('aaSequences');
db<>fiddle