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In a shell script, create a database if it does not exist

Use the MySQL: SELECT SCHEMA_NAME FROM INFORMATION_SCHEMA.SCHEMATA WHERE SCHEMA_NAME = 'database_name'

<?php
if (mysql_num_rows(mysql_query("SELECT SCHEMA_NAME FROM INFORMATION_SCHEMA.SCHEMATA WHERE SCHEMA_NAME = '". $dbname ."'"))) {
  echo "Database $dbname already exists.";
}
else {
  // go on and create the user, database, etc.
  // create the user

  if (!mysql_query("CREATE USER '". $dbuser ."'@'%' IDENTIFIED BY '". $dbpass ."'"))  die(mysql_error());
  echo "User $dbuser created.\n";

  // does this do anything
  if (!mysql_query("GRANT USAGE ON * . * TO '". $dbuser ."'@'%' IDENTIFIED BY '". $dbpass ."' WITH MAX_QUERIES_PER_HOUR 0 MAX_CONNECTIONS_PER_HOUR 0 MAX_UPDATES_PER_HOUR 0 MAX_USER_CONNECTIONS 0")) die(mysql_error());
  echo "Granted usage.\n";
 
  // create the database.
  // CREATE DATABASE `livingcon_live` ;
  if (!mysql_query("CREATE DATABASE `". $dbname. "`"))  die(mysql_error());
  echo "Database $dbname created.\n";
 
  // GRANT ALL PRIVILEGES ON `livingcon_live` . * TO 'livingcon_live'@ '%';  -- spaces don't work b/n @ and %
  if (!mysql_query("GRANT ALL PRIVILEGES ON `". $dbname ."` . * TO '". $dbuser ."'@'%'"))  die(mysql_error());
  echo "Granted privileges of user $dbuser to database $dbname \n";
 
  echo "Copy and save this password for use on the Drupal install page, if needed:\n $dbpass \n";
}
?>

That's pretty much the whole PHP abomination which can be found at scripts/_agaric_makedatabase.sh

Alternate, better methods of creating the database, not used at the moment:

Bash: http://drupal.org/node/196417 (First Draft of BASH script for creating new multisite)
Perl: system('mysql -u *** -p -e \'create database activity_1_'.$date.'\'');

For another way of checking if a database exists, see:

http://articles.techrepublic.com.com/5100-10878_11-1045433.html

Resolution

Searched words: 
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Comments

Bash script to check for a db

dbuser=user
dbpass=pass
#STEP 1 - CREATE DB
#check if db exists first
echo "Creating a database for $newdb"
DBS=`mysql -u$dbuser -p$dbpass -Bse 'show databases'| egrep -v 'information_schema|mysql'`
for db in $DBS; do
if [ "$db" = "$newdb" ]
then
echo "This database already exists : exiting now"
    exit
  fi
done
mysqladmin -u$dbuser -p$dbpass create $newdb;
echo "Database $newdb created"

How to check if a mysql database exists or nor via Bash script

I found this easier:

check if db exists first: databases in MySQL are folders in the filesystem; what makes it easy to find weather a database exists or not:

if test -d "/var/lib/mysql/$dbname"; then
echo -e "Database \"$dbname\" already exists"
else ...

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