public FunctionRecord getFunctionByID(long functionID) {
		try {
			FunctionRecord functionRecord = functionsTable.getFunctionByID(functionID);
			return functionRecord;
		}
		catch (IOException e) {
			Msg.error(this, "Serious problem finding Function record by ID", e);
		}
		return null;
	}
Returns a single function record given its id, or null if no such record exists.
@param functionID the function record primary key id
@return the function record or null if non-existent
Ghidra/Features/FunctionID/src/main/java/ghidra/feature/fid/db/FidDB.java