/** * call-seq: * cacheToFile(filename) * * Sets query caching on. Future queries will be cached to the * file "filename". * * A default time-to-live of 10 minutes is also set. * * Note that once cacheToFile() is called, the result sets of all * future queries will be cached to that file until another call to * cacheToFile() changes which file to cache to or a call to * cacheOff() turns off caching. */ static VALUE sqlrcur_cacheToFile(VALUE self, VALUE filename) {