Oracle-将存储过程复制到远程数据库

Question

An assignment I have as part of my pl/sql studies requires me to create a remote database connection and copy down all my tables to it from local, and then also copy my other objects that reference data, so my views and triggers etc.

The idea is that at the remote end, the views etc should reference the local tables provided the local database is online, and if it is not, then they should reference the tables stored on the remote database.

So I've created a connection, and a script that creates the tables at the remote end.

I've also made a pl/sql block to create all the views and triggers at the remote end, whereby a simple select query is run against the local database to check if it is online, if it is online then a series of execute immediate statements creates the views etc with reference to table_name@local, and if it isn't online the block skips to the exception section, where a similar series of execute immediate statements creates the same views but referencing the remote tables.

OK so this is where I become unsure. I have a package that contains a few procedures and a function, and I'm not sure what's the best way to create that at the remote end so that it behaves in a similar way in terms of where it picks up its reference tables from.

Is it simply a case of enclosing the whole package-creating block within an 'execute immediate', in the same way as I did for the views, or should I create two different packages and call them something like pack1 and pack1_remote?

Or is there as I suspect a more efficient method of achieving the goal?

cheers!

Answer 1

This is absolutely not how any reasonable person in the real world would design a system. Suggesting something like what I suggest here in the real world will, in the best case, get you laughed out of the room.

The least insane approach I could envision would be to have two different schemas. Schema 1 would own the tables. Schema 2 would own the code. At install time, create synonyms for every object that schema 2 needs to reference. If the remote database is available when the code is installed, create synonyms that refer to objects in the remote database. Otherwise, create synonyms that refer to objects in the local database. That lets you create a single set of objects without using dynamic SQL by creating an extra layer of indirection between your code and your tables.