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Listing 11-4. Displaying the DEFINE and CONCAT Character Settings SQL> show define define "&" (hex 26) SQL> show concat concat "." (hex 2e) SQL> If you don t want SQL*Plus to display the explicit replacement of substitution variables by the values you entered (as in Listings 11-1, 11-2, and 11-3), you can suppress that with the SQL*Plus VERIFY setting, as shown in Listing 11-5. Listing 11-5. Switching the VERIFY Setting ON and OFF SQL> set verify on SQL> set verify off SQL> show verify verify OFF SQL> If you change the VERIFY setting to OFF, as shown in Listing 11-5, and you execute the SQL command (still in the SQL buffer) with the SQL*Plus RUN command, you don t see the old: ... and new: ... lines anymore, as shown in Listing 11-6. Listing 11-6. The Effect of VERIFY OFF SQL> select ename from employees 2 where empno between &x and &x+100; Enter value for x: 7500 Enter value for x: 7500 ENAME -------WARD JONES SQL>

Say two documents are represented by five individual pages each, and say images are singlepage TIFFs. The images for the first document are named 0001.TIF through 0005.TIF and have aliases PX0001 through PX0005. The images for the first document are named 0006.TIF through 0010.TIF and have aliases PX0006 through PX0010. Finally, the media volume is DVD001. The structure of the log file describing these images could be as follows: PX0001,DVD001,C:\IMAGES\DVD001\001\0001.TIF,Y,,,5 PX0002,DVD001,C:\IMAGES\DVD001\001\0002.TIF,,,, PX0003,DVD001,C:\IMAGES\DVD001\001\0003.TIF,,,, PX0004,DVD001,C:\IMAGES\DVD001\001\0004.TIF,,,, PX0005,DVD001,C:\IMAGES\DVD001\001\0005.TIF,,,, PX0006,DVD001,C:\IMAGES\DVD001\001\0006.TIF,Y,,,5 PX0007,DVD001,C:\IMAGES\DVD001\001\0007.TIF,,,, PX0008,DVD001,C:\IMAGES\DVD001\001\0008.TIF,,,, PX0009,DVD001,C:\IMAGES\DVD001\001\0009.TIF,,,, PX0010,DVD001,C:\IMAGES\DVD001\001\0010.TIF,,,, When documents are represented by single-page images, the log file will contain a separate and unique entry for each page. The first image corresponding to the first page of the first document contains the letter Y in the DOC_BREAK position of the file. Successive pages contain the letter N, to indicate that they re part of the same document. The sixth line of the file representing 0006.TIF represents the first page of a new document. The DOC_BREAK position of that record contains the letter Y.

Summary

If you want to store the value of a SQL*Plus variable (at least temporarily) so you can use it multiple times, you need the next category of SQL*Plus variables: user-defined variables. You can use the SQL*Plus DEFINE command to declare user-defined variables and to assign values to them, as shown in Listing 11-7.

Say two documents are represented by five individual pages each, and say images are multipage TIFFs. The images for the first document are named 0001.TIF through 0005.TIF and have

Listing 11-7. Assigning Values to User-Defined Variables with DEFINE SQL> define x=7500 SQL> select ename from employees 2 where empno between &x and &x+100; ENAME -------WARD JONES SQL> The DEFINE command in Listing 11-7 stores the user-defined variable X with its value 7500. That s why SQL*Plus doesn t prompt for a value for X anymore in Listing 11-7. The SQL*Plus DEFINE command not only allows you to assign values to user-defined variables, but also to display current values. Using the DEFINE command, you can display the value of a specific variable. You can also display a complete listing of all user-defined variables by not specifying a variable name and just entering the DEFINE command itself. The SQL*Plus UNDEFINE command allows you to remove a user-defined variable. Listing 11-8 shows examples of DEFINE and UNDEFINE. Listing 11-8. DEFINE and UNDEFINE Examples SQL> def x DEFINE X = "7500" (CHAR)

In this chapter, we covered producing and consuming REST web services, explicitly via using a pre-existing CPAN module and implicitly by showing the type of code written in the test script for the REST module. We also briefly examined the other major options for implementing web services in Catalyst. In the next chapter, we ll look at extending Catalyst. We ll first discuss how to create your own base controllers and views, and then we ll look at the various methods with which you can create your own subroutine attributes.

SQL> def DEFINE _DATE = "25-SEP-2004" (CHAR) DEFINE _CONNECT_IDENTIFIER = "orcl" (CHAR) DEFINE _USER = "BOOK" (CHAR) DEFINE _PRIVILEGE = "" (CHAR) DEFINE _SQLPLUS_RELEASE = "1001000200" (CHAR) DEFINE _EDITOR = "vim" (CHAR) DEFINE _O_VERSION = "Oracle Database 10g Enterprise Edition Release 10.1.0.2.0 - Production With the Partitioning, OLAP and Data Mining options" (CHAR) DEFINE _O_RELEASE = "1001000200" (CHAR) DEFINE X = "7500" (CHAR) SQL> undefine x SQL>