لطفا منتظر باشید ...
B.7. Databases
If you''ve got a
database, Perl can
work with it. This section describes some of the common types of
databases.
B.7.1. Direct System Database Access
Perl can directly access some system databases, sometimes with the
help of a module. These are databases like the
Windows
Registry (which holds machine-level settings), or the
Unix password database (which lists which
username corresponds to which number, and related information), as
well as the domain-name database (which lets you
translate an IP number into a machine name, and vice versa).
B.7.2. Flat-file Database Access
If you''d like to access your own flat-file databases from Perl, there
are modules to help you with doing that (seemingly a new one every
month or two, so any list here would be out of date). You can even do
quite a bit without a module, with what we give in Chapter 16, "Simple Databases".
B.7.3. Relational Database Access
Relational databases include Sybase,
Oracle, Informix, mysql, and others. These are complex enough that
you generally do need to know about modules to use them. But if you
use the
DBI module, whose name stands for
"database-independent," you can minimize your dependence
upon any one type of database -- then, if you have to move from
mysql to Oracle, say, you might not even need to change anything at
all in your program.
