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authorAndrey Andreev <narf@bofh.bg>2012-06-11 15:12:43 +0200
committerAndrey Andreev <narf@bofh.bg>2012-06-11 15:12:43 +0200
commit71379ca89226fe8af0314a8b70e5dc0f57367255 (patch)
tree7a2356481098652dec85b4810be3fab13d4363b6 /system/database/drivers
parentba2617646eb072be0ecfec8818e332345010fc03 (diff)
Add OFFSET support for SQL Server 2005+ in MSSQL/SQLSRV
Diffstat (limited to 'system/database/drivers')
-rw-r--r--system/database/drivers/mssql/mssql_driver.php25
-rw-r--r--system/database/drivers/sqlsrv/sqlsrv_driver.php25
2 files changed, 46 insertions, 4 deletions
diff --git a/system/database/drivers/mssql/mssql_driver.php b/system/database/drivers/mssql/mssql_driver.php
index 87094e76e..47dc55844 100644
--- a/system/database/drivers/mssql/mssql_driver.php
+++ b/system/database/drivers/mssql/mssql_driver.php
@@ -504,7 +504,30 @@ class CI_DB_mssql_driver extends CI_DB {
*/
protected function _limit($sql, $limit, $offset)
{
- return preg_replace('/(^\SELECT (DISTINCT)?)/i','\\1 TOP '.($limit + $offset).' ', $sql);
+ // As of SQL Server 2012 (11.0.*) OFFSET is supported
+ if (version_compare($this->version(), '11', '>='))
+ {
+ return $sql.' OFFSET '.(int) $offset.' ROWS FETCH NEXT '.(int) $limit.' ROWS ONLY';
+ }
+
+ $limit = $offset + $limit;
+
+ // As of SQL Server 2005 (9.0.*) ROW_NUMBER() is supported,
+ // however an ORDER BY clause is required for it to work
+ if (version_compare($this->version(), '9', '>=') && $offset && ! empty($this->qb_orderby))
+ {
+ $orderby = 'ORDER BY '.implode(', ', $this->qb_orderby);
+
+ // We have to strip the ORDER BY clause
+ $sql = trim(substr($sql, 0, strrpos($sql, 'ORDER BY '.$orderby)));
+
+ return 'SELECT '.(count($this->qb_select) === 0 ? '*' : implode(', ', $this->qb_select))." FROM (\n"
+ .preg_replace('/^(SELECT( DISTINCT)?)/i', '\\1 ROW_NUMBER() OVER('.$orderby.') AS '.$this->escape_identifiers('CI_rownum').', ', $sql)
+ ."\n) ".$this->escape_identifiers('CI_subquery')
+ ."\nWHERE ".$this->escape_identifiers('CI_rownum').' BETWEEN '.((int) $offset + 1).' AND '.$limit;
+ }
+
+ return preg_replace('/(^\SELECT (DISTINCT)?)/i','\\1 TOP '.$limit.' ', $sql);
}
// --------------------------------------------------------------------
diff --git a/system/database/drivers/sqlsrv/sqlsrv_driver.php b/system/database/drivers/sqlsrv/sqlsrv_driver.php
index eebd6bff8..825c02452 100644
--- a/system/database/drivers/sqlsrv/sqlsrv_driver.php
+++ b/system/database/drivers/sqlsrv/sqlsrv_driver.php
@@ -463,9 +463,28 @@ class CI_DB_sqlsrv_driver extends CI_DB {
protected function _limit($sql, $limit, $offset)
{
// As of SQL Server 2012 (11.0.*) OFFSET is supported
- return version_compare($this->version(), '11', '>=')
- ? $sql.' OFFSET '.(int) $offset.' ROWS FETCH NEXT '.(int) $limit.' ROWS ONLY'
- : preg_replace('/(^\SELECT (DISTINCT)?)/i','\\1 TOP '.($limit + $offset).' ', $sql);
+ if (version_compare($this->version(), '11', '>='))
+ {
+ return $sql.' OFFSET '.(int) $offset.' ROWS FETCH NEXT '.(int) $limit.' ROWS ONLY';
+ }
+
+ $limit = $offset + $limit;
+
+ // An ORDER BY clause is required for ROW_NUMBER() to work
+ if ($offset && ! empty($this->qb_orderby))
+ {
+ $orderby = 'ORDER BY '.implode(', ', $this->qb_orderby);
+
+ // We have to strip the ORDER BY clause
+ $sql = trim(substr($sql, 0, strrpos($sql, 'ORDER BY '.$orderby)));
+
+ return 'SELECT '.(count($this->qb_select) === 0 ? '*' : implode(', ', $this->qb_select))." FROM (\n"
+ .preg_replace('/^(SELECT( DISTINCT)?)/i', '\\1 ROW_NUMBER() OVER('.$orderby.') AS '.$this->escape_identifiers('CI_rownum').', ', $sql)
+ ."\n) ".$this->escape_identifiers('CI_subquery')
+ ."\nWHERE ".$this->escape_identifiers('CI_rownum').' BETWEEN '.((int) $offset + 1).' AND '.$limit;
+ }
+
+ return preg_replace('/(^\SELECT (DISTINCT)?)/i','\\1 TOP '.$limit.' ', $sql);
}
// --------------------------------------------------------------------