PSQL-mini-projects/periodic-table.sh at main · advitagelli/PSQL-mini-projects · GitHub

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#!/bin/bash
PSQL="psql --username=freecodecamp --dbname=periodic_table -t --no-align -c"


if [[ -z $1 ]]
then
  echo -e "Please provide an element as an argument."
else
    #atomic number
  if [[ $1 =~ ^[1-9][0-9]*$ ]]
  then
      ATOMIC_NUMBER=$1
      NAME=$($PSQL "SELECT name FROM elements WHERE atomic_number=$ATOMIC_NUMBER")
      if [[ -z $NAME ]]
      then
        echo -e "I could not find that element in the database."
      else
        SYMBOL=$($PSQL "SELECT symbol FROM elements WHERE atomic_number=$ATOMIC_NUMBER")
        TYPE=$($PSQL "SELECT type FROM types INNER JOIN properties USING(type_id) WHERE atomic_number=$ATOMIC_NUMBER")
        MASS=$($PSQL "SELECT atomic_mass FROM properties WHERE atomic_number=$ATOMIC_NUMBER")
        MP=$($PSQL "SELECT melting_point_celsius FROM properties WHERE atomic_number=$ATOMIC_NUMBER")
        BP=$($PSQL "SELECT boiling_point_celsius FROM properties WHERE atomic_number=$ATOMIC_NUMBER")

        echo -e "The element with atomic number $ATOMIC_NUMBER is $NAME ($SYMBOL). It's a $TYPE, with a mass of $MASS amu. $NAME has a melting point of $MP celsius and a boiling point of $BP celsius."
      fi
  else
    case $1 in
    #symbol
    [A-Z] | [A-Z][a-z])

      SYMBOL=$1
      ATOMIC_NUMBER=$($PSQL "SELECT atomic_number FROM elements WHERE symbol='$SYMBOL'")
      if [[ -z $ATOMIC_NUMBER ]]
      then
        echo -e "I could not find that element in the database."
      else
        NAME=$($PSQL "SELECT name FROM elements WHERE symbol='$SYMBOL'")
        TYPE=$($PSQL "SELECT type FROM types INNER JOIN properties USING(type_id) WHERE atomic_number=$ATOMIC_NUMBER")
        MASS=$($PSQL "SELECT atomic_mass FROM properties WHERE atomic_number=$ATOMIC_NUMBER")
        MP=$($PSQL "SELECT melting_point_celsius FROM properties WHERE atomic_number=$ATOMIC_NUMBER")
        BP=$($PSQL "SELECT boiling_point_celsius FROM properties WHERE atomic_number=$ATOMIC_NUMBER")

        echo -e "The element with atomic number $ATOMIC_NUMBER is $NAME ($SYMBOL). It's a $TYPE, with a mass of $MASS amu. $NAME has a melting point of $MP celsius and a boiling point of $BP celsius."
      fi
    ;;

    #name
    [A-Z][a-z]*)

      NAME=$1
      SYMBOL=$($PSQL "SELECT symbol FROM elements WHERE name='$NAME'")
      if [[ -z $SYMBOL ]]
      then
        echo -e "I could not find that element in the database."
      else
        ATOMIC_NUMBER=$($PSQL "SELECT atomic_number FROM elements WHERE name='$NAME'")
        TYPE=$($PSQL "SELECT type FROM types INNER JOIN properties USING(type_id) WHERE atomic_number=$ATOMIC_NUMBER")
        MASS=$($PSQL "SELECT atomic_mass FROM properties WHERE atomic_number=$ATOMIC_NUMBER")
        MP=$($PSQL "SELECT melting_point_celsius FROM properties WHERE atomic_number=$ATOMIC_NUMBER")
        BP=$($PSQL "SELECT boiling_point_celsius FROM properties WHERE atomic_number=$ATOMIC_NUMBER")

        echo -e "The element with atomic number $ATOMIC_NUMBER is $NAME ($SYMBOL). It's a $TYPE, with a mass of $MASS amu. $NAME has a melting point of $MP celsius and a boiling point of $BP celsius."
      fi
    ;;

    *)
      echo -e "I could not find that element in the database."
    ;;
  esac
 fi
fi