Bash non-interactive mysql database creation issue

I have a bash script that utilizes dialog to show the progress bar during non-interactive Mysql database creation.

System OS: Ubuntu 20.04 server
Mariadb: 10.5

The issue:
Only the first Mysql command gets executed (i.e. create database) and in case of others there is Error 1064.

#!/usr/bin/env bash
export NCURSES_NO_UTF8_ACS=1
var_db() {
    pfx=$(shuf -zer -n2 {a..z} | tr -d '\0')
    vnum=$(shuf -i 8-11 -n 1)
    sfx=$(openssl rand -base64 32 | tr -d /=+ | cut -c -"$vnum")
    varnam="${pfx}_${sfx}"
    echo "$varnam"
}
site_db() {
    dbname=$(var_db)
    userdb=$(var_db)
    vnum=$(shuf -i 12-15 -n 1)
    passdb=$(openssl rand -base64 32 | tr -d /=+ | cut -c -"$vnum")
    msgs=('Database created'
    'Database user created'
    'All privileges granted on database to user'
    'Reload privilege tables'
    'Restart Mariadb'
    'Reload Mariadb'
        )
    commands=('sudo mysql -e "CREATE DATABASE ${dbname};"'
    'sudo mysql -e "CREATE USER ${userdb}@localhost IDENTIFIED BY '${passdb}';"'
    'sudo mysql -e "GRANT ALL PRIVILEGES ON ${dbname}.* TO '${userdb}'@'localhost';"'
    'sudo mysql -e "FLUSH PRIVILEGES;"'
    'sudo systemctl restart mariadb'
    'sudo systemctl reload mariadb'
            )
    n=${#commands[@]}
    i=0
    while [ "$i" -le "$n" ]; do
        pct=$(( i * 100 / n )) # calculating progress percentage
        if [ $pct -eq 100 ]; then
            echo -e "XXX\n100\nMariadb secure installation completed!\nXXX"
        else
            echo -e "XXX\n$i\n${msgs[i]}\nXXX"
        fi
        echo "$pct"
        eval "${commands[i]}" > /dev/null 2>&1 #eval the output of the commands, 
        i=$((i + 1))
        sleep 2
    done | dialog --keep-tite --title "Site database configuration" --gauge "Site database created" 20 100 0
}
site_db

However, if I don't use the commands inside an array, then all the mysql commands get executed in the script below. So, why is there an Error 1064 in the above script?

#!/usr/bin/env bash
var_db() {
    pfx=$(shuf -zer -n2 {a..z} | tr -d '\0')
    vnum=$(shuf -i 8-11 -n 1)
    sfx=$(openssl rand -base64 32 | tr -d /=+ | cut -c -"$vnum")
    varnam="${pfx}_${sfx}"
    echo "$varnam"
}
site_db() {
    dbname=$(var_db)
    userdb=$(var_db)
    vnum=$(shuf -i 12-15 -n 1)
    passdb=$(openssl rand -base64 32 | tr -d /=+ | cut -c -"$vnum")
    sudo mysql -e "CREATE DATABASE ${dbname};"
    sudo mysql -e "CREATE USER ${userdb}@localhost IDENTIFIED BY '${passdb}';"
    sudo mysql -e "GRANT ALL PRIVILEGES ON ${dbname}.* TO '${userdb}'@'localhost';"
    sudo mysql -e "FLUSH PRIVILEGES;"
    sudo systemctl restart mariadb
            )
}
site_db