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Better support for LIMIT, minimal support for OFFSET.

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This commit is contained in:
Tom Rix 2009-06-04 03:02:35 +00:00
parent 1290b0e4c7
commit a2d2b73893
1 changed files with 24 additions and 7 deletions
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31
code/MSSQLDatabase.php
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@ -228,6 +228,7 @@ class MSSQLDatabase extends Database {
/*
* TODO: test this, as far as I know we haven't got the create method working...
* 4th Jun 09 / Tom Rix - worked for me
*/
public function createDatabase() {
$this->query("CREATE DATABASE \"$this->database\"");
@ -990,9 +991,6 @@ class MSSQLDatabase extends Database {
if($sqlQuery->orderby && strtoupper(trim($sqlQuery->orderby)) == 'RAND()') $sqlQuery->orderby = "NEWID()";
//TODO: remove me when the limit function supposedly works
$sqlQuery->limit='';
//Get the limit and offset
$limit='';
$offset='0';
@ -1011,6 +1009,18 @@ class MSSQLDatabase extends Database {
$text='';
$limitText='';
// If there's a limit but no offset, just use 'TOP X'
// rather than the more complex sub-select method
if ($limit != 0 && $offset == 0) {
$limitText = 'SELECT TOP '.$limit;
$sqlQuery->limit = null;
}
// Uncomment this to enable the EXPERIMENTAL offset support
$sqlQuery->limit = null;
// Geoff's sub-select way
if($sqlQuery->limit) {
$text='SELECT * FROM ( SELECT ROW_NUMBER() OVER (';
$limitText=' ORDER BY ' . $sqlQuery->orderby . ') AS Number,';
@ -1034,10 +1044,11 @@ class MSSQLDatabase extends Database {
if($limitText=='')
if($sqlQuery->orderby) $text .= " ORDER BY " . $sqlQuery->orderby;
// Limit not implemented
// Geoff's sub-select way
if($sqlQuery->limit){
$text.=') AS Numbered WHERE Number BETWEEN ' . $offset . ' AND ' . ($offset+$limit) . ';';
$text.=') AS Numbered WHERE Number BETWEEN ' . $offset . ' AND ' . ($offset+$limit) . ';';
}
//if($sqlQuery->limit) {
/*
@ -1059,12 +1070,18 @@ class MSSQLDatabase extends Database {
select ROW_NUMBER() over (order by SiteTree.Title) AS RowNum, *
FROM SiteTree) as Numbered
WHERE RowNum Between 0 And 1;
Tom's way
WITH SQLQueryTable AS (
SELECT *,
ROW_NUMBER() OVER (ORDER BY XXX) AS 'SQLQueryRowNumber'
FROM YYY
) SELECT * FROM SQLQueryTable WHERE SQLQueryRowNumber BETWEEN 10 AND 20;
*/
//}
return $text;
}