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29 lines
1.4 KiB
Bash
29 lines
1.4 KiB
Bash
#!/bin/bash
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PSQL="psql -X --username=freecodecamp --dbname=periodic_table --no-align --tuples-only -c"
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if [[ $# -ge 1 ]]
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then
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if [[ $1 =~ ^[0-9]+$ ]]
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then
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ELEMENTQUERY=$($PSQL "SELECT atomic_number, symbol, name FROM elements WHERE atomic_number=$1")
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IFS="|" read ATOMIC_NUMBER SYMBOL NAME <<< $ELEMENTQUERY
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elif [[ ${#1} -le 2 ]]
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then
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ELEMENTQUERY=$($PSQL "SELECT atomic_number, symbol, name FROM elements WHERE symbol='$1'")
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IFS="|" read ATOMIC_NUMBER SYMBOL NAME <<< $ELEMENTQUERY
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else
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ELEMENTQUERY=$($PSQL "SELECT atomic_number, symbol, name FROM elements WHERE name='$1'")
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IFS="|" read ATOMIC_NUMBER SYMBOL NAME <<< $ELEMENTQUERY
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fi
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if [[ ${#ELEMENTQUERY} -le 0 ]]
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then
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echo -e "I could not find that element in the database."
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else
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PROPERTIESQUERY=$($PSQL "SELECT atomic_mass::REAL, melting_point_celsius, boiling_point_celsius, type_id FROM properties WHERE atomic_number=$ATOMIC_NUMBER")
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IFS="|" read ATOMIC_MASS MELTING_POINT BOILING_POINT TYPE_ID <<< $PROPERTIESQUERY
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TYPE=$($PSQL "SELECT type FROM types WHERE type_id=$TYPE_ID")
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echo -e "The element with atomic number $ATOMIC_NUMBER is $NAME ($SYMBOL). It's a $TYPE, with a mass of $ATOMIC_MASS amu. $NAME has a melting point of $MELTING_POINT celsius and a boiling point of $BOILING_POINT celsius."
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fi
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else
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echo "Please provide an element as an argument."
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fi |