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functions.inc.php:

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fully working MySQL version of create_page_browser()

- force $page_size to int and die() if it is < 2
- dropped $item_count parameter - the function now counts itsself
- include last row in the query
- return empty array (= no pagebrowser) if all rows fit in one page
- PgSQL queries are still on my TODO list


git-svn-id: https://svn.code.sf.net/p/postfixadmin/code/trunk@1030 a1433add-5e2c-0410-b055-b7f2511e0802
This commit is contained in:
Christian Boltz 2011-04-10 16:30:49 +00:00
parent a10272d1d2
commit cfd1be04b2
1 changed files with 30 additions and 11 deletions
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41
functions.inc.php
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@ -573,23 +573,43 @@ function get_domain_properties ($domain)
*
* @param String idxfield - database field name to use as title
* @param String query - core part of the query (starting at "FROM")
* @param Int item_count - number of total items (this function is lazy and doesn't want to count itsself ;-)
* @return String
*/
function create_page_browser($idxfield, $query, $item_count) {
function create_page_browser($idxfield, $querypart) {
global $CONF;
$page_size = $CONF['page_size'];
$page_size = (int) $CONF['page_size'];
$label_len = 2;
$pagebrowser = array();
# TODO: item_count is undefined on search results
# if ( $item_count <= $page_size ) return array(); # very short list - no pagebrowser needed
if ($page_size < 2) { # will break the page browser
die('$CONF[\'page_size\'] must be 2 or more!');
}
# get number of rows
$query = "SELECT count(*) as counter $querypart";
$result = db_query ($query);
if ($result['rows'] > 0) {
$row = db_array ($result['result']);
$count_results = $row['counter'] -1; # we start counting at 0, not 1
}
# echo "<p>rows: " . ($count_results +1) . " --- $query";
if ($count_results < $page_size) {
return array(); # only one page - no pagebrowser required
}
# init row counter
$initcount = "SET @row=-1";
$result = db_query($initcount);
$last_in_page = $page_size - 1;
$query = "SELECT * FROM (SELECT $idxfield AS label, @row := @row + 1 AS row $query ) idx WHERE MOD(idx.row, $page_size) IN (0,$last_in_page)";
# get labels for relevant rows (first and last of each page)
$page_size_zerobase = $page_size - 1;
$query = "
SELECT * FROM (
SELECT $idxfield AS label, @row := @row + 1 AS row $querypart
) idx WHERE MOD(idx.row, $page_size) IN (0,$page_size_zerobase) OR idx.row = $count_results
";
# echo "<p>$query";
# TODO: $query is MySQL-specific
@ -597,7 +617,7 @@ function create_page_browser($idxfield, $query, $item_count) {
# http://www.postgresql.org/docs/8.1/static/sql-createsequence.html
# http://www.postgresonline.com/journal/archives/79-Simulating-Row-Number-in-PostgreSQL-Pre-8.4.html
# http://www.pg-forum.de/sql/1518-nummerierung-der-abfrageergebnisse.html
# CREATE TEMPORARY SEQUENCE foo MINVALUE 0 MAXVALUE $page_size CYCLE
# CREATE TEMPORARY SEQUENCE foo MINVALUE 0 MAXVALUE $page_size_zerobase CYCLE
# afterwards: DROP SEQUENCE foo
$result = db_query ($query);
@ -606,9 +626,8 @@ function create_page_browser($idxfield, $query, $item_count) {
if ($row2 = db_array ($result['result'])) {
$label = substr($row['label'],0,$label_len) . '-' . substr($row2['label'],0,$label_len);
$pagebrowser[] = $label;
} else {
$label = substr($row['label'],0,$label_len) . '-' . 'ZZ';
# TODO: separate query for the last row - or include it in the main query (... OR row = $item_count)
} else { # only one row remaining
$label = substr($row['label'],0,$label_len);
$pagebrowser[] = $label;
}
}