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This is not the preferred way to create cocos2d objects. It s much easier to use the static initializer methods, which return an autorelease object. Contrary to what Apple recommends, the use of autorelease is consistently built into the cocos2d engine s design by moving calls like [[[NSObject alloc] init] autorelease] to a static method in the class itself. And that s a good thing do not fight it! It will make your life easier since you don t have to remember which objects need to be released, which is often cause for either crashes due to over-releasing certain objects or memory leaks due to not releasing all objects.

This runs at 11:05 p.m. daily. It would keep only one extra day s worth of data, but that might be enough for you. You could extend this to keep more backups, but this has a high disk space penalty (although disk these days is cheap), and there quickly comes a point where you are better off relying on your tape backups.

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shows how you can use the TABLE function for that purpose. (For further details about the TABLE function, see Oracle SQL Reference.) Listing 12-6. Using the TABLE Function to Unnest the NUMLIST Array SQL> break on empno SQL> select e.empno, n.* 2 from e 3 , TABLE(e.numlist) n; EMPNO COLUMN_VALUE -------- -----------------7698 06-23456789 7782 4231 06-12345678 7839 1234 06-78765432 029-8765432 7934 2345 SQL> Suppose that we want to go one step further and be able to select specific phone numbers from the array (for example, the second one). In that case, we need PL/SQL again, because the SQL language does not support a direct way to access array elements by their index value. It is not difficult to build a PL/SQL function to return a certain element from an array. 5 showed an example of a PL/SQL stored function to count the number of employees per department (Listing 5-31). Listing 12-7 shows how you can create a PL/SQL stored function to return the first phone number from the NUMLIST array, assuming that number represents the internal extension number. Listing 12-7. Creating a PL/SQL Function to Return Array Elements SQL> create or replace function ext 2 (p_varray_in numberlist_t) 3 return varchar2 4 is 5 v_ext varchar2(20); 6 begin 7 v_ext := p_varray_in(1); 8 return v_ext; 9 end; 10 / Function created. SQL> select ename, init, ext(numlist)

In the case of the CCNode class, the static initializer is +(id) node. The following code sends the alloc message to self, which is equivalent to using [CCNode alloc] if the code is placed in the CCNode implementation.

If you do have a disaster, you can now just rewrite your LDAP NFS maps (see recipe 2-13) to use backupserver:/shared/homebackup rather than homeserver:/shared/home, and everyone can access their files again (albeit with possibly up to 24 hours lost) while you fix the problem. This script will rewrite the LDAP maps for you: 01 #!/usr/bin/perl -w 02 use strict; 03 use Net::LDAPS; 04 05 my $ldapserver = 'ldapserver.example.com'; 06 my $base = 'ou=people,dc=example,dc=com'; 06 my $oldhome = 'homeserver:/homedisk/'; 07 my $newhome = 'newserver:/newhome/'; 08 09 my $ldap = Net::LDAPS->new( $ldapserver, 10 verify => 'optional', 11 cafile => '/etc/ldap/cacert.pem' ) or die $@; 12 my $mesg = $ldap->bind; 13 14 $mesg = $ldap->search( base => $base, 15 filter => "automountInformation=*$oldhome*",

e deptno = 10; EXT(NUMLIST) -----------4231 1234 2345

+(id) node { return [[[self alloc] init] autorelease]; }

The DEPTNO value (10) in the WHERE clause of this query is carefully chosen, in order to avoid error messages. Just change the DEPTNO value in Listing 12-7, and you will see the corresponding Oracle error messages.

16 17 18 19 20 21 22 23 24 25

It s just a little more generic to use self in this case, and perfectly legal in case you happen to be a C++ programmer now scratching your head. Seeing this, we can rewrite the CCNode allocation to use the static initializer and, quite unsurprisingly, the code is now very short, concise, and tidy. Just the way I like it:

Note The EXT stored function is kept as simple as possible. For example, there is no code to handle situations where employees have no phone number list or an empty phone number list. It is relatively easy to enhance the EXT function definition with some proper exception handling. However, this is not a PL/SQL book, and the EXT function is meant only to illustrate the concept.

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