/**
* Transforms the query from the parent to provide LIMIT functionality.
*/
public function getQuery()
{
$query = parent::getQuery();
if ($this->hasLimit) {
$max = $this->offset + $this->limit;
if ($this->offset > 0) {
$min = $this->offset + 1;
$query = "SELECT * FROM (SELECT a.*, ROWNUM rn FROM ( {$query} ) a WHERE rownum <= {$max} ) WHERE rn >= {$min}";
} else {
$query = "SELECT a.* FROM ( {$query} ) a WHERE ROWNUM <= {$max}";
}
}
return $query;
}
/**
* Returns the SQL string for the subselect.
*
* Example:
* <code>
* <?php
* $subSelect = $q->subSelect();
* $subSelect->select( name )->from( 'table2' );
* $q->select( '*' )
* ->from( 'table1' )
* ->where ( $q->expr->eq( 'name', $subSelect ) );
* $stmt = $q->prepare();
* $stmt->execute();
* ?>
* </code>
*
* @return string
*/
public function getQuery()
{
return '( ' . parent::getQuery() . ' )';
}
/**
* Transforms the query from the parent to provide LIMIT functionality.
*
* Note: doesn't work exactly like the MySQL equivalent; it will always return
* $limit rows even if $offset + $limit exceeds the total number of rows.
*
* @throws ezcQueryInvalidException if offset is used and orderBy is not.
* @return string
*/
public function getQuery()
{
$query = parent::getQuery();
if ($this->hasLimit) {
if ($this->offset) {
if (!$this->orderString) {
// Uh ow. We need some columns to sort in the oposite order to make this work
throw new ezcQueryInvalidException("LIMIT workaround for MS SQL", "orderBy() was not called before getQuery().");
}
return 'SELECT * FROM ( SELECT TOP ' . $this->limit . ' * FROM ( ' . self::top($this->offset + $this->limit, $query) . ' ) AS ezcDummyTable1 ' . $this->invertedOrderString . ' ) AS ezcDummyTable2 ' . $this->orderString;
}
return self::top($this->limit, $query);
}
return $query;
}
