I cannot use Digikam with mysql anymore. It refuses to start the mysql process. I suppose this is because of the following code in databaseserver.cpp:

const QString mysqldPath(DatabaseConfigElement::element(dbType).dbServerCmd);
//const QString mysqldPath("/usr/sbin/mysqld");
if ( mysqldPath.isEmpty() || mysqldPath.compare( QLatin1String( "SERVERCMD_MYSQL-NOTFOUND" ) ))
{
        kDebug() << "No path to mysqld set in server configuration!";
        return DatabaseServerError(DatabaseServerError::StartError, i18n("No path to mysqld set in server configuration."));
}

The method always aborts when the mysqldPath is either empty or != "SERVERCMD_MYSQL-NOTFOUND". So unless your mysqld binary is named like that, digikam refuses to start it. You should rather use the == operator than compare().

Reproducible: Always

Steps to Reproduce:
1. Configure digikam to use an internal mysql server
2. Invoke "Check Database Connection" or just restart digikam
Actual Results:  
Digikam is unable to start mysqld and thus cannot connect to the database.

Expected Results:  
Digikam starts mysqld properly.

I'd classify this as major, because I cannot access my images from digikam anymore.