[mongo db_exists command] MongoDB command to check if a database exists. I use it with a puppet script to conditionally load up a database dump if one isn't detected. Useful for provisioning Vagrant. Returns with exit code zero if the database was found. #mongodb

db_exists.js

function db_exists(db_name) {
    db = db.getSiblingDB('admin');
    db.runCommand('listDatabases').databases.forEach(function(db_entry){
        if (db_entry.name == db_name) {
            // quit with exit code zero if we found our db
            quit(0);
        }
    });

    // quit with exit code 1 if db was not found
    quit(1);
}
db_exists('MY_DATABASE');