Create a dynamic database for each user using PHP

Posted May 3, 2021 666 views

Any suggestions on how we can create dynamic database for each user using PHP (as an when they register)? I am using the below code - it works on the local server, but not working in the live server on digitalocean. Is this a permission issue to create DB?

public function setupNewDatabaseWithSubdomainName($domain_name = '') {
        $db2 = array(
            'dsn' => '', 'hostname' => $this->hostname, 'username' => $this->username, 'password' => $this->password, 'database' => $domain_name,
            'dbdriver' => 'mysqli', 'dbprefix' => '', 'pconnect' => FALSE, 'db_debug' => (ENVIRONMENT !== 'production'),
            'cache_on' => FALSE, 'cachedir' => '', 'char_set' => 'utf8', 'dbcollat' => 'utf8_general_ci', 'swap_pre' => '',
            'encrypt' => FALSE, 'compress' => FALSE, 'stricton' => FALSE, 'failover' => array(), 'save_queries' => TRUE

        $sql_db = "CREATE DATABASE IF NOT EXISTS " . $domain_name;
        $this->dbNew = $this->load->database($db2, TRUE);
        $arr_table_lists = $this->retun_all_tables_from_database($this->db->database);
        foreach ($arr_table_lists as $tbl_name) {
            $sql_new = "";
            $sql_new = "SHOW CREATE TABLE " . $this->db->database . "." . $tbl_name->table_name;
            $query = $this->db->query($sql_new);
            $result = $query->result_array();
            $sql_new = strtolower($result[0]['Create Table']);
            $sql_new = str_replace("create table", "create table if not exists ", $sql_new);
edited by bobbyiliev

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1 answer

Hi there,

Yes indeed if you are not using the root MySQL user it could be related to the privileges of the non-root user that you are using.

What you could do is grant the user privileges to either all databases or better all databases with a specific prefix.

  • To grant privileges to all databases you could run the following:
GRANT ALL PRIVILEGES ON *.* TO 'your_user'@'%';
  • To keep things a bit more secure, you could introduce a prefix for all of your databases, for example, you could add a keyword like saas or your_app_name before each database, then you could use the following query to grant privileges to your user to all databases that start with that specific keyword:
GRANT ALL ON `yourPrefix\_%`.* TO 'your_user'@'%' WITH GRANT OPTION;

That way your_user will have access and be able to create any databases that start with yourPrefix\_.

If you take the second approach you would need to update this line here in your code to include the new prefix:

        $sql_db = "CREATE DATABASE IF NOT EXISTS yourPrefix\_" . $domain_name;

Hope that this helps.