/**
 *  call-seq:
 *  setCacheTtl(ttl)
 *
 *  Sets the time-to-live for cached result sets. The sqlr-cachemanger will
 *  remove each cached result set "ttl" seconds after it's created, provided
 *  it's scanning the directory containing the cache files. */
static VALUE sqlrcur_setCacheTtl(VALUE self, VALUE ttl) {