如何判断链中的最后一个方法？

Question

I've started using method chains in my PHP app:

$object->do()->something();

Specifically with querying databases:

$database->select()->from('mytable');

However at the moment I need to call a function to actually perform the query at the end:

$database->select()->from('mytable')->perform();

This is annoying because usually every chain will perform straight away. Sometimes it wouldn't, but 9 times out of 10 it will. I need this to work with any object, not just a database handler.

Is there a way to tell if the last method I call is the last one in the method itself, so it would perform() without me telling it to?

If not, I might just try to use some keywords like ->now() instead of ->perform()

I have a few idea(s):

• each method has a parameter that if set will let it know it's at the end (maybe it can loop through all parameters to find if a special constant was passed?) eg $object->do()->something(now);

Answer 1

Using an operator overloading extension, you can specify one of the unary operators for prompting executions

Example:

~$db->select()->from()->where();

If you want to avoid installing an extension, one suggestion I can make is using some kind of escape character in your latest chain call to promp the execution. You should omit it from the final query to avoid syntax errors.

Example:

$db->select()->from()->where("id = 1 ~"); //~ character implies automatic execution