Database Reference
In-Depth Information
SELECT
color, size, accessories,
cust_name, cust_street, cust_city, cust_state
FROM cow_order WHERE id = ?
}
,
undef
,
$id
);
2. Begin the form:
print
start_form
(
-
action
=>
url
());
3. Generate the hidden field containing the
id
value that uniquely identifies the
cow_order
record:
print
hidden
(
-
name
=>
"id"
,
-
value
=>
$id
,
-
override
=>
1
);
The
override
argument forces CGI.pm to use the value specified in the
value
argument as the hidden field value. If
override
is not true, CGI.pm normally tries
to use values present in the script execution environment to initialize form fields,
even if you provide values in the field-generating calls. (CGI.pm does this to make
it easier to redisplay a form with the values the user just submitted. For example, if
you find that a form has been filled in incorrectly, you can redisplay it and ask the
user to correct any problems. To make sure that a form element contains the value
you specify, it's necessary to override this behavior.)
4. Create the fields that describe the cow figurine specifications. Generate these fields
the same way as described in Recipes
20.2
and
20.3
, except set the default values
from the contents of record 1. The code here presents
color
as a pop-up menu,
size
as a set of radio buttons, and
accessories
as a set of checkboxes. Note that it
splits the
accessories
value at commas to produce an array of values because the
column value might name several accessory items:
my
$color_ref
=
$dbh
->
selectcol_arrayref
(
qq{
SELECT color FROM cow_color ORDER BY color
}
);
print
br
(),
"Cow color:"
,
br
();
print
popup_menu
(
-
name
=>
"color"
,
-
values
=>
$color_ref
,
-
default
=>
$color
,
-
override
=>
1
);
my
$size_info
=
get_enumorset_info
(
$dbh
,
"cookbook"
,
"cow_order"
,
"size"
);
print
br
(),
"Cow figurine size:"
,
br
();
print
radio_group
(
-
name
=>
"size"
,
-
values
=>
$size_info
->
{
values
},
-
default
=>
$size
,
-
override
=>
1
,
-
linebreak
=>
1
);
my
$acc_info
=
get_enumorset_info
(
$dbh
,
"cookbook"
,
