Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

Improving limit method using LIMIT,OFFSET #393

Draft
wants to merge 1 commit into
base: master
Choose a base branch
from
Draft

Improving limit method using LIMIT,OFFSET #393

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
25 changes: 8 additions & 17 deletions library/Zend/Db/Adapter/Db2.php
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -680,25 +680,16 @@ public function limit($sql, $count, $offset = 0)
require_once 'Zend/Db/Adapter/Db2/Exception.php';
throw new Zend_Db_Adapter_Db2_Exception("LIMIT argument offset=$offset is not valid");
}

if ($offset === 0) {
return $sql . " FETCH FIRST $count ROWS ONLY";
}


/**
* DB2 does not implement the LIMIT clause as some RDBMS do.
* We have to simulate it with subqueries and ROWNUM.
* Unfortunately because we use the column wildcard "*",
* this puts an extra column into the query result set.
* DB2Modern versions already have `LIMIT,OFFSET` available.
*/
return "SELECT z2.*
FROM (
SELECT ROW_NUMBER() OVER() AS \"ZEND_DB_ROWNUM\", z1.*
FROM (
" . $sql . "
) z1
) z2
WHERE z2.zend_db_rownum BETWEEN " . ($offset+1) . " AND " . ($offset+$count);
$sql .= " LIMIT $count";
if ($offset > 0) {
$sql .= " OFFSET $offset";
}

return $sql;
}

/**
Expand Down
Loading