使用Shell脚本从PostgreSQL检索数据并通过邮件发送

Question

I want to daily retrieve data from my postgreSQL database and send the results by mail, what is the best way to do it please ?

I think about a shell script that execute my SELECT and then send it with mail function but I do not know how to do the SELECT part.

#!/bin/sh
todayDate = $(date);
nbUsers = mySelect;
nbPosts = mySelect;

echo "We are ".$date." dans there are ".$nbUsers." users and ".$nbPosts." posts " | mail -s "[DAILY]" test@test.com

EDIT (Updated code) :

#!/bin/sh
todayDate=$(date +%y%m%d%H%M%S)
nbUsers=$(su postgres -c "psql -d database -c 'SELECT COUNT(*) FROM table1'")
nbPosts=$(su postgres -c "psql -d database -c 'SELECT COUNT(*) FROM table2'")

echo "We are $todayDate. There are $nbUsers users and $nbPosts posts." | mail -s "[DAILY] Databse" test@test.com

EDIT2 (Updated code)

#!/bin/sh
su - postgres
todayDate=$(date +"%d/%m/%y")
todayTime=$(date +"%T")
nbUsers=$(psql -A -t -d database -c "SELECT COUNT(id) FROM table1;")
nbPosts=$(psql -A -t -d database -c "SELECT COUNT(id) FROM table2;")
echo "We are $todayDate. There are $nbUsers users and $nbPosts posts." | mail -s "[DAILY] Databse" test@test.com

Answer 1

You can retrieve data using psql command from postgresql database

nbUsers=`su postgres -c "psql -d databasename -c 'SELECT * FROM tableName'"`

after that you can send output of this command to mail