## ----setup, include = FALSE----------------------------------------------
source("setup/setup.R")

## ----connect, eval = FALSE-----------------------------------------------
# library(RMariaDB)
# 
# fin_db <- dbConnect(
#   MariaDB(),
#   username = "guest",
#   password = "ctu-relational",
#   dbname = "Financial_ijs",
#   host = "relational.fel.cvut.cz"
# )

## ----connect-real, echo = FALSE------------------------------------------
# library(RMariaDB)
# 
# fin_db <- dm:::financial_db_con()

## ----load-full-----------------------------------------------------------
# library(dm)
# 
# fin_dm <- dm_from_con(fin_db)
# fin_dm

## ----names---------------------------------------------------------------
# names(fin_dm)
# fin_dm$loans
# dplyr::count(fin_dm$trans)

## ----select--------------------------------------------------------------
# fin_dm_small <- fin_dm[c("loans", "accounts", "districts", "trans")]
# fin_dm_small <-
#   fin_dm %>%
#   dm_select_tbl(loans, accounts, districts, trans)

## ----load----------------------------------------------------------------
# library(dm)
# 
# fin_dm_small <-
#   dm_from_con(fin_db, learn_keys = FALSE) %>%
#   dm_select_tbl(loans, accounts, districts, trans)

## ----keys----------------------------------------------------------------
# fin_dm_keys <-
#   fin_dm_small %>%
#   dm_add_pk(table = accounts, columns = id) %>%
#   dm_add_pk(loans, id) %>%
#   dm_add_fk(table = loans, columns = account_id, ref_table = accounts) %>%
#   dm_add_pk(trans, id) %>%
#   dm_add_fk(trans, account_id, accounts) %>%
#   dm_add_pk(districts, id) %>%
#   dm_add_fk(accounts, district_id, districts)

## ----visualize_keys------------------------------------------------------
# fin_dm_keys %>%
#   dm_set_colors(darkgreen = c(loans, accounts), darkblue = trans, grey = districts) %>%
#   dm_draw()

## ----squash--------------------------------------------------------------
# fin_dm_keys %>%
#   dm_flatten_to_tbl(loans, .recursive = TRUE)

## ----model---------------------------------------------------------------
# loans_df <-
#   fin_dm_keys %>%
#   dm_flatten_to_tbl(loans, .recursive = TRUE) %>%
#   select(id, amount, duration, A3) %>%
#   collect()
# 
# model <- lm(amount ~ duration + A3, data = loans_df)
# 
# model

## ----zoom----------------------------------------------------------------
# fin_dm_total <-
#   fin_dm_keys %>%
#   dm_zoom_to(loans) %>%
#   summarize(.by = account_id, total_amount = sum(amount, na.rm = TRUE)) %>%
#   dm_insert_zoomed("total_loans")
# 
# fin_dm_total$total_loans

## ----constraints---------------------------------------------------------
# fin_dm_total %>%
#   dm_examine_constraints()

## ----disconnect, echo = FALSE, results = "hide"--------------------------
# dbDisconnect(fin_db)