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| Chapter 8 PLVtab: Easy Access to PL/SQL Tables |

## 8.5 Setting the Display Prefix

The PLVtab `set_prefix` procedure allows you to specify a prefix that is to be displayed before the row values. This prefix is only displayed when you are not showing the row numbers. The default value for the prefix is NULL, which means that you don't see any prefix unless you call the `set_prefix` program. The header for this procedure is:

>     PROCEDURE set_prefix (prefix_in IN VARCHAR2 := NULL)

Since the single argument has a default value of NULL, you can set the prefix back to its default value simply by entering this command:

>     SQL> PVLtab.set_prefix;

The following script shows you how the prefix is set and used in the display of PLVtab table information.

>     DECLARE
>        nms PLVtab.vc80_table;
>        lo INTEGER;
>        hi INTEGER;
>     BEGIN
>        PLVtab.noshowrow;
>        PLVtab.set_prefix ('Company Name = ');
>        nms (1505) := 'ACME';
>        nms (20200) := 'ArtForms';
>        lo := 1505;
>        hi := 20200;
>        PLVtab.display (nms, hi, 'Selected Company Names', lo, hi-lo);
>     END;
>     /
>     Selected Company Names
>     Company Name = ACME
>     Company Name = ArtForms

8.4 Showing Row Number Toggle |  | 8.6 Emptying Tables with PLVtab

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