MySQL syntax error GRANT

Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:

What can be wrong in this syntax? I want to create a user and grant some rights in a MySQL database (8.0) using the latest DBD driver


    my $user = 'somename';     
    my $password="0123";
    my $db ="test";
    my $host="localhost";

    print "Connecting to terminology database $db as $user... ";
    my $dsn = "DBI:mysql:$db:$host:$port";
    my %attr = (PrintError=>0, RaiseError=>1);
    my $dbh = DBI->connect($dsn,$Superuser,$pass, \%attr);
    print "done!\n";

    my $sql;
    print "Creating user $user\n";
        $sql = 'CREATE USER ?@? IDENTIFIED BY ?';
        $dbh->do($sql, undef, $user, "localhost", $password); 
    print "done!\n";
    
    print "Granting user $user some rights\n";
    $sql = 'GRANT ALL ON $db.* TO ?@? IDENTIFIED BY ?';
    $dbh->do(q{GRANT ALL ON ?.* TO ?@? IDENTIFIED BY ?}, {}, $db, $use
+r, $host, $password);
    print "done!\n";
[download]

I connect to the database as "root", so it should have all the privileges. I get the following

Connecting to terminology database test as root... done!
Creating user somename
done!
Granting user somename some rights
DBD::mysql::db do failed: You have an error in your SQL syntax; check 
+the manual that corresponds to your MySQL server version for the righ
+t syntax to use near ''test'.* TO 'somename'@'localhost' IDENTIFIED B
+Y '0123'' at line 1
[download]

Comment on MySQL syntax error GRANT Select or Download Code

Replies are listed 'Best First'.
Re: MySQL syntax error GRANT by poj (Abbot) on Oct 02, 2018 at 19:38 UTC
See DBI placeholders With most drivers, placeholders can't be used for any element of a statement that would prevent the database server from validating the statement and creating a query execution plan for it. i.e database names, table names, column names etc. Try `$sql = "GRANT ALL ON $db.* TO ?@? IDENTIFIED BY ?"; $dbh->do($sql, {}, $user, $host, $password);` [download] poj	[reply] [d/l]
Re^2: MySQL syntax error GRANT by Anonymous Monk on Oct 02, 2018 at 19:50 UTC
Very interested indeed. It works, provided `IDENTIFIED BY ?` is not passed, as it really seems it is no (more?) accepted in 8.0	[reply] [d/l]
Re: MySQL syntax error GRANT by Paladin (Vicar) on Oct 02, 2018 at 18:54 UTC
According to the docs GRANT doesn't have an IDENTIFIED BY clause.	[reply]
Re^2: MySQL syntax error GRANT by Anonymous Monk on Oct 02, 2018 at 19:04 UTC
I thought about this, but even: `my $user = 'somename'; my $db ="test"; my $host="localhost"; $dbh->do(q{GRANT ALL ON ?.* TO ?@?}, {}, $db, $user, $host);` [download] does not produce any improvement, same syntax error. I am quite perplex.	[reply] [d/l]