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API CHANGE: Added SQLQuery::count(), SQLQuery::firstRow(), and SQLQuery::lastRow()

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This commit is contained in:
Sam Minnee 2009-11-22 16:42:29 +13:00
parent 8a9903988f
commit 7fab93f7cb
1 changed files with 57 additions and 0 deletions
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57
model/SQLQuery.php
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@ -503,6 +503,63 @@ class SQLQuery {
return (in_array($SQL_fieldName,$selects) || stripos($sql,"AS {$SQL_fieldName}"));
}
/**
* Return the number of rows in this query if the limit were removed. Useful in paged data sets.
* @return int
*
* TODO Respect HAVING and GROUPBY, which can affect the result-count
*/
function count( $column = null) {
// Choose a default column
if($column == null) {
if($this->groupby) {
$column = 'DISTINCT ' . implode(", ", $this->groupby);
} else {
$column = '*';
}
}
$clone = clone $this;
$clone->select = array("count($column)");
$clone->limit = null;
$clone->orderby = null;
$clone->groupby = null;
$count = $clone->execute()->value();
// If there's a limit set, then that limit is going to heavily affect the count
if($this->limit) {
if($count >= ($this->limit['start'] + $this->limit['limit']))
return $this->limit['limit'];
else
return max(0, $count - $this->limit['start']);
// Otherwise, the count is going to be the output of the SQL query
} else {
return $count;
}
}
/**
* Returns a query that returns only the first row of this query
*/
function firstRow() {
$query = clone $this;
$offset = $this->limit ? $this->limit['start'] : 0;
$query->limit(array('start' => $offset, 'limit' => 1));
return $query;
}
/**
* Returns a query that returns only the last row of this query
*/
function lastRow() {
$query = clone $this;
$offset = $this->limit ? $this->limit['start'] : 0;
$query->limit(array('start' => $this->count() + $offset - 1, 'limit' => 1));
return $query;
}
}
?>