insert_data.sh

#! /bin/bash

if [[ $1 == "test" ]]
then
  PSQL="psql --username=postgres --dbname=worldcuptest -t --no-align -c"
else
  PSQL="psql --username=freecodecamp --dbname=worldcup -t --no-align -c"
fi
# Do not change code above this line. Use the PSQL variable above to query your database.
echo $($PSQL "TRUNCATE games, teams")
cat games.csv | while IFS="," read YEAR ROUND WINNER OPPONENT WINNER_GOALS OPPONENT_GOALS
do
  if [[ $YEAR != "year" ]]
  then

    # get winner_id
    WINNER_ID=$($PSQL "SELECT team_id FROM teams WHERE name='$WINNER'")

    # if not found
    if [[ -z $WINNER_ID ]]
    then
      # insert winner
      INSERT_WINNER_TEAM=$($PSQL "INSERT INTO teams(name) VALUES('$WINNER')")

      # get new winner_id
      WINNER_ID=$($PSQL "SELECT team_id FROM teams WHERE name='$WINNER'")
    fi

    # get opponent_id
    OPPONENT_ID=$($PSQL "SELECT team_id FROM teams WHERE name='$OPPONENT'")

    # if not found
    if [[ -z $OPPONENT_ID ]]
    then
      # insert opponent
      INSERT_OPPONENT_TEAM=$($PSQL "INSERT INTO teams(name) VALUES('$OPPONENT')")

      # get new opponent_id
      OPPONENT_ID=$($PSQL "SELECT team_id FROM teams WHERE name='$OPPONENT'")
    fi

    INSERT_MAJORS_COURSES_RESULT=$($PSQL "INSERT INTO games(year, round, winner_id, opponent_id, winner_goals, opponent_goals) VALUES($YEAR, '$ROUND', $WINNER_ID, $OPPONENT_ID, $WINNER_GOALS, $OPPONENT_GOALS)")

  fi

done