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In the area of datatype conversion, you can leave many issues up to the Oracle DBMS. However, for reasons of syntax clarity, it is better to express the datatype conversions explicitly with the appropriate conversion functions. See the query in Listing 5-29 for an example. Listing 5-29. Relying on Implicit Datatype Conversion SQL> select ename, substr(bdate,8)+16 2 from employees 3 where deptno = 10; ENAME SUBSTR(BDATE,8)+16 -------- -----------------CLARK 81 KING 68 MILLER 78 SQL> This query is internally interpreted and executed by the Oracle DBMS as the following: SQL> select ename, TO_NUMBER(substr(to_char(bdate,'...'),8))+16 2 from employees 3 where deptno = 10 You should have formulated the query that way in the first place.

Log into the machine you want to use as your Kerberos server let s call it kerberos.example.com. Kerberos packages should be available for any major distribution (or you can of course compile from source, but I won t cover that here). For Debian/Ubuntu, you d use this: sudo apt-get install krb5-kdc krb5-admin-server libkrb5-dev krb5-config krb5-user krb5-clients libkadm55

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In some cases, it may be preferable to lock the framerate to 30 frames per second This may be helpful in very complex games where you can t achieve 60 fps consistently and the framerate fluctuates a lot between 30 and 60 fps In such a case, it s often better to lock the framerate to the lowest common denominator because a lower but steady framerate is perceived as smoother by players than a framerate that tends to fluctuate abruptly, even when the actual average framerate may be higher Human perception is a tricky thing NOTE: You can t render more than 60 frames per second on iOS devices The device s display is locked to update at 60 frames per second (Hz), and forcing cocos2d to render more frames than 60 per second is, at best, not doing anything At worst, it can actually slow down your framerate.

The last function to discuss in this section about conversion functions is CAST. This function is part of the ANSI/ISO SQL standard, as opposed to all other conversion functions discussed so far in this section. The CAST function is a generic conversion function. It allows you to convert any expression to any specific datatype, including the option to specify a datatype precision. See Listing 5-30 for some examples. Listing 5-30. CAST Function Examples SQL> 2 3 4 select , , from cast(12.98 as number(2)) example1 cast('oak' as char(10) ) example2 cast(null as date ) example3 dual;

Stick with the animationInterval of 10/60 if you want to run cocos2d at the fastest possible rate..

Although you might argue that Oracle already offers more than enough functions, you may find that you need a specific capability that isn t already provided. In that case, you can develop your own functions (using PL/SQL) and add them to the SQL language. PL/SQL is the standard procedural programming language for Oracle databases. PL/SQL is a superset of SQL, adding several procedural capabilities to the nonprocedural SQL language. Here, we will investigate one simple example of PL/SQL language usage in relation to custom functions. For more information about PL/SQL, refer to Oracle PL/SQL User s Guide and Reference. Listing 5-31 shows how to define a function to determine the number of employees for a given department. Listing 5-31. Creating a Stored Function Using PL/SQL SQL> create or replace function emp_count(p_deptno in number) 2 return number is 3 cnt number(2) := 0; 4 begin 5 select count(*) into cnt 6 from employees e 7 where e.deptno = p_deptno; 8 return (cnt);

Note This recipe uses the MIT version of Kerberos. The other main implementation available is Heimdal

Enabling the FPS display will show a small number at the lower left corner of the screen. This is your framerate, or the frames per second the screen is updated. Ideally your game should be running at 60 fps at all times, especially if it s an action or twitch-based game. Some games, such as most puzzle games, can go with a constant 30 fps just

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(originally developed as a non-U.S. version back when there were legal issues with the U.S.-based MIT version being exported, which is no longer the case). MIT s version is more widely used and slightly more active in development terms. Windows and Java also come with their own versions of Kerberos, and other free implementations are available.

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