Database Reference
In-Depth Information
my
$total_recs
=
$dbh
->
selectrow_array
(
"SELECT COUNT(*) FROM states"
);
# Select the records in the current page of the result set
my
$stmt
=
sprintf
(
"SELECT name, abbrev, statehood, pop
FROM states
ORDER BY name LIMIT %d,%d"
,
$start
-
1
,
# number of records to skip
$per_page
);
# number of records to select
my
$tbl_ref
=
$dbh
->
selectall_arrayref
(
$stmt
);
$dbh
->
disconnect
();
# Display results as HTML table
my
@rows
;
push
(
@rows
,
Tr
(
th
([
"Name"
,
"Abbreviation"
,
"Statehood"
,
"Population"
])));
for
(
my
$i
=
0
;
$i
<
@
{
$tbl_ref
};
$i
++
)
{
# get data values in row $i
my
@cells
=
@
{
$tbl_ref
->
[
$i
]};
# get data values in row $i
# map values to HTML-encoded values, or to if null/empty
@cells
=
map
{
defined
(
$_
)
&&
$_
ne
""
?
escapeHTML
(
$_
) :
" "
}
@cells
;
# add cells to table
push
(
@rows
,
Tr
(
td
(
\
@cells
)));
}
$page
.=
table
({
-
border
=>
1
},
@rows
)
.
br
();
# Generate links to all pages of the result set. All links are
# live, except the one to the current page, which is displayed as
# static text. Link label format is "[m to n]" where m and n are
# the numbers of the first and last records displayed on the page.
for
(
my
$first
=
1
;
$first
<=
$total_recs
;
$first
+=
$per_page
)
{
my
$last
=
$first
+
$per_page
-
1
;
$last
=
$total_recs
if
$last
>
$total_recs
;
my
$label
=
"$first to $last"
;
my
$link
;
if
(
$first
!=
$start
)
# live link
{
my
$url
=
sprintf
(
"%s?start=%d;per_page=%d"
,
url
(),
$first
,
$per_page
);
$link
=
a
({
-
href
=>
$url
},
$label
);
}
else
# static text
