光标和视图有什么区别？

Question

What is the difference between cursor and view ? Because none of them store data in the database.

Answer 1

A cursor is defined and used within the scope of a stored procedure (it is used with PL/SQL).

On the other hand, a view is a database object (similar to a table), which can be used even outside of stored procedures as well, as in queries (it can be used with both SQL and PL/SQL).

Reference :

1. Views on Oracle Database Concepts

2. Cursors on Oracle Magazine

Answer 2

A view is a pre-defined query which is stored in the database and can be used much like a table.

A cursor is a data structure which provides access to the rowset returned by a query.

Share and enjoy.

Answer 3

VIEWS are for easy usage like MACROS except materialized Views.

Materialised views have data stored up in memory. Where as other views when queried, simply gets replaced with the coressponding definition while executed. And it is available for everyone to query, until they have privilege to access it.

CURSORS other way is a different thing. It is pointing to a resultset of somequery available to the creator of it. Either a PL/SQL or any other OCI calls.

Answer 4

Cursors are handy to set up report data, since the simplest way to make a report is to set up a rather non-normalized table of the data in the appropriate order, and run from there.

Views are used a lot by developers who don't know whether the end user will have Fox tables or use SQL-server, or whose Fox tables are reaching their limit and might be migrated for size reasons. The programming which uses the views (the grid on the form) is the same whether the view is local or remote. Then, when the data is migrated, the effort to change from local views to remote views is small.