Raw SQL SELECT interactions

Sometimes SQL abilities are needed that norm can not represent well.

For such cases, norm provides a way to execute raw SQL SELECT queries and parse the received data into a user provided ref object type. This bypassses norm's ability to generate the SQL for you, but still allows you to use norm's ability parse Row instances.

import std/json
import norm/[model, sqlite, pragmas]

type Campaign* = ref object of Model
    name* {.unique.}: string

type Creature* = ref object of Model
    name*: string
    campaign* {.fk: Campaign.}: int64

putEnv("DB_HOST", ":memory:")
let db = getDb()
db.createTables(Campaign())
db.createTables(Creature())

# Add entries to Db
var campaign = Campaign(name: "MyCampaign")
db.insert(campaign)

var creature1 = Creature(name: "creature1", campaign: campaign.id)
var creature2 = Creature(name: "creature2", campaign: campaign.id)
db.insert(creature1)
db.insert(creature2)

# Query DB
type CreatureCampaignCount* = ref object
  count*: int

let countCampaignCreaturesQuery: string = """
    SELECT COUNT(*) AS count
    FROM creature
    INNER JOIN campaign ON creature.campaign = campaign.id
    WHERE campaign.name = ?
  """

var countResult = CreatureCampaignCount()
db.rawSelect(countCampaignCreaturesQuery, countResult, campaign.name)

echo countResult.count
2