LazyRoundRobinDialContext implements `DialContextFunc` of `github.com/go-sql-driver/mysql` driver.

RegisterLocations add a set of MySQL instance locations with name to reference it.

RoundRobinDial implements `DialFunc` of `github.com/go-sql-driver/mysql` driver.

RoundRobinDialContext implements `DialContextFunc` of `github.com/go-sql-driver/mysql` driver.

UnregisterLocations remove a set of MySQL instance locations with previous register name.

DialsErr indicate all attempt of dialing are failed.

EmptyLocationsErr indicate given locations for register is empty.

Location is the network and address of MySQL server instance.

LocationSyntaxErr indicate failed on parsing given location address.

TimeoutErr indicate operation is timeout.

UnknownLocationsErr indicate given addr (name) not found in register locations.