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You can declare bind variables with the SQL*Plus VARIABLE command, and you can display bind variable values with the SQL*Plus PRINT command. Because SQL doesn t support any syntax to assign values to bind variables, we use the SQL*Plus EXECUTE command to execute a single PL/SQL command from SQL*Plus. Listing 11-16 shows examples of using these commands. Listing 11-16. Declaring Bind Variables and Assigning Values SQL> variable x number SQL> variable y varchar2(8) SQL> execute :x := 7566 PL/SQL procedure successfully completed. SQL> execute :y := 'ADMIN' PL/SQL procedure successfully completed. SQL> print x y X -----7566 Y -------------------------------ADMIN SQL> variable variable x datatype NUMBER variable datatype SQL> y VARCHAR2(8)

2. 3.

As you can see, we have created two variables, we have assigned values to them, and we can display those values. Note that := is the assignment operator in PL/SQL.

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In April 2004, just months before Robosapien s worldwide launch, much of the work on Robosapien was complete and the factories in China were already beginning their manufacturing runs It was during this time that Mark Tilden sat down and wrote a 37-page document on the Robosapien titled Robosapien Website Content 4-12-04 It is a great piece of writing, a primer for Robosapien in the words of its creator Parts of this document would end up being edited and would become the manual that is included in the box with each Robosapien Another part would become the Robosapien Frequently Asked Questions section found on WowWee s Robosapien website1 And yet another portion would become part of a series of secrets and programming tips that WowWee would periodically post on their website.

When compressing the texture in the last step, it s important that you specify the correct output parameters. The pixel type determines whether the generated texture uses 2 bits per pixel (OGL_PVRTC2) or 4 bpp (OGL_PVRTC4). This is a quality/memory trade off that s easiest determined by compressing an image and having a look at the result on the iPhone. The alpha setting specifies whether the texture features an alpha channel. The input to libPVRTexLib must be RGBA, but at this point, you can disable the alpha channel again if you don t need it. Twiddled (sometimes also called swizzled ) refers to a non-linear memory layout. This means pixel values are not stored one after each other, but instead have been reordered to improve memory access locality. The GPU expects PVRTC textures in this format, so you have to enable this option. Last, but not least, you should set setVerticallyFlipped() to true for OpenGL, or otherwise the texture will be displayed upside down.

Now let s see whether we can retrieve the same two employees (7566 and 7900) using a bind variable. See Listing 11-17. Listing 11-17. Using Bind Variables in SQL Commands SQL> select * from employees where empno = :x; EMPNO ENAME INIT JOB MGR BDATE MSAL COMM DEPTNO ------ -------- ----- -------- ----- ----------- ------ ----- -----7566 JONES JM MANAGER 7839 02-APR-1967 2975 20 SQL> execute :x := 7900 PL/SQL procedure successfully completed. SQL> run 1* select * from employees where empno = :x EMPNO ENAME INIT JOB MGR BDATE MSAL COMM DEPTNO ------ -------- ----- -------- ----- ----------- ------ ----- -----7900 JONES R ADMIN 7698 03-DEC-1969 800 30 SQL> Because EXECUTE is a SQL*Plus command, which means it is not stored in the SQL buffer, you can assign a new value and reexecute the query from the SQL buffer with the RUN command. If you want to see some evidence of the behavior of the Oracle DBMS, take a look at Listing 11-18. Listing 11-18. Querying V$SQLAREA to See the Differences SQL> select executions, sql_text 2 from v$sqlarea 3 where sql_text like 'select * from employees %'; EXECUTIONS ---------2 1 1 SQL> For more details about bind variables, refer to PL/SQL User s Guide and Reference. SQL_TEXT -----------------------------------------select * from employees where empno = :x select * from employees where empno = 7566 select * from employees where empno = 7900

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