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All DDL commands (such as CREATE, ALTER, DROP, GRANT, and REVOKE) always imply an implicit COMMIT. To put it another way, each single DDL command is executed as a transaction in itself, consisting of a single command, and is committed immediately.

then until we hand x a specific collection object to refer to, x is said to be undefined. We must take the distinct step of using the new operator to invoke a specific constructor for the type of collection that we wish to create: x = new CollectionType<elementType>(); for example: x = new ArrayList<Student>(); Think of the newly created collection object as an empty egg carton, and the reference variable referring to the collection as the handle that allows us to locate and access reference this egg carton in the JVM s memory whenever we d like.

This works because the generic views return simple HttpResponse objects that can be treated like dictionaries to set HTTP headers. This Content-Disposition business, by the way, instructs the browser to download and save the page instead of displaying it in the browser.

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Actually, the collection-as-egg-carton analogy is a bit of an oversimplification, because rather than physically storing objects ( eggs ) in a collection ( egg carton ), we store references to such objects in the collection. That is, the objects being organized by a collection live physically outside of the collection in the JVM s memory; only their handles reside inside of the collection. This notion is illustrated in Figure 6-1.

Normally, many users and applications access database systems at the same time. This is known as concurrency. The RDBMS must make sure that concurrency is handled properly. The most drastic approach for a RDBMS would be to handle all user transactions one by one, blocking all data exclusively until the end of each transaction. Such a transaction serialization approach would result in unnecessary and unacceptable wait times; the overall system throughput would be very poor. RDBMSs like Oracle control concurrent data access with locking to prevent database users from updating rows with pending (uncommitted) changes from other database users. This section gives some information about how the Oracle RDBMS handles locking and concurrency.

Figure 6-1. A collection organizes references to objects that live in memory outside of the collection.

In this chapter we looked at only a couple of the generic views Django ships with, but the general ideas presented here should apply pretty closely to any generic view. Appendix D covers all the available views in detail, and it s recommended reading if you want to get the most out of this powerful feature. In the next chapter we delve deep into the inner workings of Django s templates, showing all the cool ways they can be extended. Until now, we ve treated the template engine as a mostly static tool you can use to render your content.

Thus, perhaps a better analogy than that of collection-as-egg-carton would be that of a collection as an address book: we record an entry in an address book (collection) for each of the people (objects) that we wish to be able to contact, but the people themselves are physically remote (see Figure 6-2).

To understand how the Oracle RDBMS handles locking, we need to identify a difference between two categories of database users: Readers: Users retrieving data (issuing SELECT statements) Writers: Users changing data (issuing INSERT, UPDATE, DELETE, and MERGE commands)

Figure 6-2. A collection is analogous to an address book, with the people it references as the objects.

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