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<?php
/**
* Object representing a SQL query.
* The various parts of the SQL query can be manipulated individually.
*
* Caution: Only supports SELECT (default) and DELETE at the moment.
*
* @todo Add support for INSERT and UPDATE queries
*
* @package framework
* @subpackage model
*/
class SQLQuery {

/**
* An array of SELECT fields, keyed by an optional alias.
* @var array
*/
protected $select = array();

/**
* An array of FROM clauses. The first one is just the table name.
* @var array
*/
protected $from = array();

/**
* An array of WHERE clauses.
* @var array
*/
protected $where = array();

/**
* An array of ORDER BY clauses, functions. Stores as an associative
* array of column / function to direction.
*
* @var string
*/
protected $orderby = array();

/**
* An array of GROUP BY clauses.
* @var array
*/
protected $groupby = array();

/**
* An array of having clauses.
* @var array
*/
protected $having = array();

/**
* An array containing limit and offset keys for LIMIT clause.
* @var array
*/
protected $limit = array();

/**
* If this is true DISTINCT will be added to the SQL.
* @var boolean
*/
protected $distinct = false;

/**
* If this is true, this statement will delete rather than select.
* @var boolean
*/
protected $delete = false;

/**
* The logical connective used to join WHERE clauses. Defaults to AND.
* @var string
*/
protected $connective = 'AND';

/**
* Keep an internal register of find/replace pairs to execute when it's time to actually get the
* query SQL.
* @var array
*/
protected $replacementsOld = array();

/**
* Keep an internal register of find/replace pairs to execute when it's time to actually get the
* query SQL.
* @var array
*/
protected $replacementsNew = array();

/**
* Construct a new SQLQuery.
*
* @param array $select An array of SELECT fields.
* @param array $from An array of FROM clauses. The first one should be just the table name.
* @param array $where An array of WHERE clauses.
* @param array $orderby An array ORDER BY clause.
* @param array $groupby An array of GROUP BY clauses.
* @param array $having An array of HAVING clauses.
* @param array|string $limit A LIMIT clause or array with limit and offset keys
*/
function __construct($select = "*", $from = array(), $where = array(), $orderby = array(), $groupby = array(), $having = array(), $limit = array()) {
$this->setSelect($select);
$this->setFrom($from);
$this->setWhere($where);
$this->setOrderBy($orderby);
$this->setGroupBy($groupby);
$this->setHaving($having);
$this->setLimit($limit);
}

function __get($field) {
if(strtolower($field) == 'select') Deprecation::notice('3.0', 'Please use getSlect() instead');
if(strtolower($field) == 'from') Deprecation::notice('3.0', 'Please use getFrom() instead');
if(strtolower($field) == 'groupby') Deprecation::notice('3.0', 'Please use getGroupBy() instead');
if(strtolower($field) == 'orderby') Deprecation::notice('3.0', 'Please use getOrderBy() instead');
if(strtolower($field) == 'having') Deprecation::notice('3.0', 'Please use getHaving() instead');
if(strtolower($field) == 'limit') Deprecation::notice('3.0', 'Please use getLimit() instead');
if(strtolower($field) == 'delete') Deprecation::notice('3.0', 'Please use getDelete() instead');
if(strtolower($field) == 'connective') Deprecation::notice('3.0', 'Please use getConnective() instead');
if(strtolower($field) == 'distinct') Deprecation::notice('3.0', 'Please use getDistinct() instead');

return $this->$field;
}

function __set($field, $value) {
if(strtolower($field) == 'select') Deprecation::notice('3.0', 'Please use setSelect() or addSelect() instead');
if(strtolower($field) == 'from') Deprecation::notice('3.0', 'Please use setFrom() or addFrom() instead');
if(strtolower($field) == 'groupby') Deprecation::notice('3.0', 'Please use setGroupBy() or addGroupBy() instead');
if(strtolower($field) == 'orderby') Deprecation::notice('3.0', 'Please use setOrderBy() or addOrderBy() instead');
if(strtolower($field) == 'having') Deprecation::notice('3.0', 'Please use setHaving() or addHaving() instead');
if(strtolower($field) == 'limit') Deprecation::notice('3.0', 'Please use setLimit() instead');
if(strtolower($field) == 'delete') Deprecation::notice('3.0', 'Please use setDelete() instead');
if(strtolower($field) == 'connective') Deprecation::notice('3.0', 'Please use setConnective() instead');
if(strtolower($field) == 'distinct') Deprecation::notice('3.0', 'Please use setDistinct() instead');

return $this->$field = $value;
}

/**
* Set the list of columns to be selected by the query.
*
* <code>
* // pass fields to select as single parameter array
* $query->setSelect(array("Col1","Col2"))->setFrom("MyTable");
*
* // pass fields to select as multiple parameters
* $query->setSelect("Col1", "Col2")->setFrom("MyTable");
* </code>
*
* @param string|array $fields
* @param boolean $clear Clear existing select fields?
* @return SQLQuery
*/
public function setSelect($fields) {
$this->select = array();
if (func_num_args() > 1) {
$fields = func_get_args();
} else if(!is_array($fields)) {
$fields = array($fields);
}
return $this->addSelect($fields);
}

/**
* Add to the list of columns to be selected by the query.
*
* <code>
* // pass fields to select as single parameter array
* $query->addSelect(array("Col1","Col2"))->setFrom("MyTable");
*
* // pass fields to select as multiple parameters
* $query->addSelect("Col1", "Col2")->setFrom("MyTable");
* </code>
*
* @param string|array $fields
* @param boolean $clear Clear existing select fields?
* @return SQLQuery
*/
public function addSelect($fields) {
if (func_num_args() > 1) {
$fields = func_get_args();
} else if(!is_array($fields)) {
$fields = array($fields);
}

foreach($fields as $idx => $field) {
if(preg_match('/^(.*) +AS +"?([^"]*)"?/i', $field, $matches)) {
Deprecation::notice("3.0", "Use selectField() to specify column aliases");
$this->selectField($matches[1], $matches[2]);
} else {
$this->selectField($field, is_numeric($idx) ? null : $idx);
}
}

return $this;
}

public function select($fields) {
Deprecation::notice('3.0', 'Please use setSelect() or addSelect() instead!');
$this->setSelect($fields);
}

/**
* Select an additional field.
*
* @param $field String The field to select (escaped SQL statement)
* @param $alias String The alias of that field (escaped SQL statement).
* Defaults to the unquoted column name of the $field parameter.
* @return SQLQuery
*/
public function selectField($field, $alias = null) {
if(!$alias) {
if(preg_match('/"([^"]+)"$/', $field, $matches)) $alias = $matches[1];
else $alias = $field;
}
$this->select[$alias] = $field;
return $this;
}

/**
* Return the SQL expression for the given field alias.
* Returns null if the given alias doesn't exist.
* See {@link selectField()} for details on alias generation.
*
* @param String $field
* @return String
*/
public function expressionForField($field) {
return isset($this->select[$field]) ? $this->select[$field] : null;
}

/**
* Set table for the SELECT clause.
*
* @example $query->setFrom("MyTable"); // SELECT * FROM MyTable
*
* @param string|array $from Escaped SQL statement, usually an unquoted table name
* @return SQLQuery
*/
public function setFrom($from) {
$this->from = array();
return $this->addFrom($from);
}

/**
* Add a table to the SELECT clause.
*
* @example $query->addFrom("MyTable"); // SELECT * FROM MyTable
*
* @param string|array $from Escaped SQL statement, usually an unquoted table name
* @return SQLQuery
*/
public function addFrom($from) {
if(is_array($from)) {
$this->from = array_merge($this->from, $from);
} elseif(!empty($from)) {
$this->from[str_replace(array('"','`'), '', $from)] = $from;
}

return $this;
}

public function from($from) {
Deprecation::notice('3.0', 'Please use setFrom() or addFrom() instead!');
return $this->setFrom($from);
}

/**
* Add a LEFT JOIN criteria to the FROM clause.
*
* @param string $table Unquoted table name
* @param string $onPredicate The "ON" SQL fragment in a "LEFT JOIN ... AS ... ON ..." statement,
* Needs to be valid (quoted) SQL.
* @param string $tableAlias Optional alias which makes it easier to identify and replace joins later on
* @return SQLQuery
*/
public function addLeftJoin($table, $onPredicate, $tableAlias = null) {
if(!$tableAlias) $tableAlias = $table;
$this->from[$tableAlias] = array('type' => 'LEFT', 'table' => $table, 'filter' => array($onPredicate));
return $this;
}

public function leftjoin($table, $onPredicate, $tableAlias = null) {
Deprecation::notice('3.0', 'Please use addLeftJoin() instead!');
$this->addLeftJoin($table, $onPredicate, $tableAlias);
}

/**
* Add an INNER JOIN criteria to the FROM clause.
*
* @param string $table Unquoted table name
* @param string $onPredicate The "ON" SQL fragment in an "INNER JOIN ... AS ... ON ..." statement.
* Needs to be valid (quoted) SQL.
* @param string $tableAlias Optional alias which makes it easier to identify and replace joins later on
* @return SQLQuery
*/
public function addInnerJoin($table, $onPredicate, $tableAlias = null) {
if(!$tableAlias) $tableAlias = $table;
$this->from[$tableAlias] = array('type' => 'INNER', 'table' => $table, 'filter' => array($onPredicate));
return $this;
}

public function innerjoin($table, $onPredicate, $tableAlias = null) {
Deprecation::notice('3.0', 'Please use addInnerJoin() instead!');
return $this->addInnerJoin($table, $onPredicate, $tableAlias);
}

/**
* Add an additional filter (part of the ON clause) on a join.
*
* @param string $table Table to join on from the original join
* @param string $filter The "ON" SQL fragment (escaped)
* @return SQLQuery
*/
public function addFilterToJoin($table, $filter) {
$this->from[$table]['filter'][] = $filter;
return $this;
}

/**
* Set the filter (part of the ON clause) on a join.
*
* @param string $table Table to join on from the original join
* @param string $filter The "ON" SQL fragment (escaped)
* @return SQLQuery
*/
public function setJoinFilter($table, $filter) {
$this->from[$table]['filter'] = array($filter);
return $this;
}

/**
* Returns true if we are already joining to the given table alias
*
* @return boolean
*/
public function isJoinedTo($tableAlias) {
return isset($this->from[$tableAlias]);
}

/**
* Return a list of tables that this query is selecting from.
*
* @return array Unquoted table names
*/
public function queriedTables() {
$tables = array();

foreach($this->from as $key => $tableClause) {
if(is_array($tableClause)) $table = '"'.$tableClause['table'].'"';
else if(is_string($tableClause) && preg_match('/JOIN +("[^"]+") +(AS|ON) +/i', $tableClause, $matches)) $table = $matches[1];
else $table = $tableClause;

// Handle string replacements
if($this->replacementsOld) $table = str_replace($this->replacementsOld, $this->replacementsNew, $table);

$tables[] = preg_replace('/^"|"$/','',$table);
}

return $tables;
}

/**
* Set distinct property.
* @param boolean $value
*/
public function setDistinct($value) {
$this->distinct = $value;
}

/**
* Get the distinct property.
* @return boolean
*/
public function getDistinct() {
return $this->distinct;
}

/**
* Set the delete property.
* @param boolean $value
*/
public function setDelete($value) {
$this->delete = $value;
}

/**
* Get the delete property.
* @return boolean
*/
public function getDelete() {
return $this->delete;
}

/**
* Set the connective property.
* @param boolean $value
*/
public function setConnective($value) {
$this->connective = $value;
}

/**
* Get the connective property.
* @return string
*/
public function getConnective() {
return $this->connective;
}

/**
* Get the limit property.
* @return array
*/
public function getLimit() {
return $this->limit;
}

/**
* Pass LIMIT clause either as SQL snippet or in array format.
* Internally, limit will always be stored as a map containing the keys 'start' and 'limit'
*
* @param int|string|array $limit If passed as a string or array, assumes SQL escaped data.
* @param int $offset
* @return SQLQuery This instance
*/
public function setLimit($limit, $offset = 0) {
if($limit && is_numeric($limit)) {
$this->limit = array(
'start' => $offset,
'limit' => $limit,
);
} else if($limit && is_string($limit)) {
if(strpos($limit, ',') !== false) list($start, $innerLimit) = explode(',', $limit, 2);
else list($innerLimit, $start) = explode(' OFFSET ', strtoupper($limit), 2);
$this->limit = array(
'start' => trim($start),
'limit' => trim($innerLimit),
);
} else {
$this->limit = $limit;
}

return $this;
}

public function limit($limit, $offset = 0) {
Deprecation::notice('3.0', 'Please use setLimit() instead!');
return $this->setLimit($limit, $offset);
}

/**
* Set ORDER BY clause either as SQL snippet or in array format.
*
* @example $sql->orderby("Column");
* @example $sql->orderby("Column DESC");
* @example $sql->orderby("Column DESC, ColumnTwo ASC");
* @example $sql->orderby("Column", "DESC");
* @example $sql->orderby(array("Column" => "ASC", "ColumnTwo" => "DESC"));
*
* @param string|array $orderby Clauses to add (escaped SQL statement)
* @param string $dir Sort direction, ASC or DESC
*
* @return SQLQuery
*/
public function setOrderBy($clauses = null, $direction = null) {
$this->orderby = array();
return $this->addOrderBy($clauses, $direction);
}

/**
* Add ORDER BY clause either as SQL snippet or in array format.
*
* @example $sql->orderby("Column");
* @example $sql->orderby("Column DESC");
* @example $sql->orderby("Column DESC, ColumnTwo ASC");
* @example $sql->orderby("Column", "DESC");
* @example $sql->orderby(array("Column" => "ASC", "ColumnTwo" => "DESC"));
*
* @param string|array $orderby Clauses to add (escaped SQL statements)
* @param string $dir Sort direction, ASC or DESC
*
* @return SQLQuery
*/
public function addOrderBy($clauses = null, $direction = null) {
if(!$clauses) {
return $this;
}

if(is_string($clauses)) {
if(strpos($clauses, "(") !== false) {
$sort = preg_split("/,(?![^()]*+\\))/", $clauses);
} else {
$sort = explode(",", $clauses);
}

$clauses = array();

foreach($sort as $clause) {
list($column, $direction) = $this->getDirectionFromString($clause, $direction);
$clauses[$column] = $direction;
}
}

if(is_array($clauses)) {
foreach($clauses as $key => $value) {
if(!is_numeric($key)) {
$column = trim($key);
$columnDir = strtoupper(trim($value));
} else {
list($column, $columnDir) = $this->getDirectionFromString($value);
}

$this->orderby[$column] = $columnDir;
}
} else {
user_error('SQLQuery::orderby() incorrect format for $orderby', E_USER_WARNING);
}

// If sort contains a function call, let's move the sort clause into a
// separate selected field.
//
// Some versions of MySQL choke if you have a group function referenced
// directly in the ORDER BY
if($this->orderby) {
$i = 0;
foreach($this->orderby as $clause => $dir) {
// Function calls and multi-word columns like "CASE WHEN ..."
if(strpos($clause, '(') !== false || strpos($clause, " ") !== false ) {
// remove the old orderby
unset($this->orderby[$clause]);

$clause = trim($clause);
$column = "_SortColumn{$i}";

$this->selectField($clause, $column);
$this->addOrderBy('"' . $column . '"', $dir);
$i++;
}
}
}

return $this;
}

public function orderby($clauses = null, $direction = null) {
Deprecation::notice('3.0', 'Please use setOrderBy() instead!');
return $this->setOrderBy($clauses, $direction);
}

/**
* Extract the direction part of a single-column order by clause.
*
* @param String
* @param String
* @return Array A two element array: array($column, $direction)
*/
private function getDirectionFromString($value, $defaultDirection = null) {
if(preg_match('/^(.*)(asc|desc)$/i', $value, $matches)) {
$column = trim($matches[1]);
$direction = strtoupper($matches[2]);
} else {
$column = $value;
$direction = $defaultDirection ? $defaultDirection : "ASC";
}
return array($column, $direction);
}

/**
* Returns the current order by as array if not already. To handle legacy
* statements which are stored as strings. Without clauses and directions,
* convert the orderby clause to something readable.
*
* @return array
*/
public function getOrderBy() {
$orderby = $this->orderby;
if(!$orderby) $orderby = array();

if(!is_array($orderby)) {
// spilt by any commas not within brackets
$orderby = preg_split('/,(?![^()]*+\\))/', $orderby);
}

foreach($orderby as $k => $v) {
if(strpos($v, ' ') !== false) {
unset($orderby[$k]);

$rule = explode(' ', trim($v));
$clause = $rule[0];
$dir = (isset($rule[1])) ? $rule[1] : 'ASC';

$orderby[$clause] = $dir;
}
}

return $orderby;
}

/**
* Reverses the order by clause by replacing ASC or DESC references in the
* current order by with it's corollary.
*
* @return SQLQuery
*/
public function reverseOrderBy() {
$order = $this->getOrderBy();
$this->orderby = array();

foreach($order as $clause => $dir) {
$dir = (strtoupper($dir) == 'DESC') ? 'ASC' : 'DESC';
$this->addOrderBy($clause, $dir);
}

return $this;
}

/**
* Set a GROUP BY clause.
*
* @param string|array $groupby Escaped SQL statement
* @return SQLQuery
*/
public function setGroupBy($groupby) {
$this->groupby = array();
return $this->addGroupBy($groupby);
}

/**
* Add a GROUP BY clause.
*
* @param string|array $groupby Escaped SQL statement
* @return SQLQuery
*/
public function addGroupBy($groupby) {
if(is_array($groupby)) {
$this->groupby = array_merge($this->groupby, $groupby);
} elseif(!empty($groupby)) {
$this->groupby[] = $groupby;
}

return $this;
}

public function groupby($where) {
Deprecation::notice('3.0', 'Please use setGroupBy() or addHaving() instead!');
return $this->setGroupBy($where);
}

/**
* Set a HAVING clause.
*
* @param string|array $having
* @return SQLQuery
*/
public function setHaving($having) {
$this->having = array();
return $this->addHaving($having);
}

/**
* Add a HAVING clause
*
* @param string|array $having Escaped SQL statement
* @return SQLQuery
*/
public function addHaving($having) {
if(is_array($having)) {
$this->having = array_merge($this->having, $having);
} elseif(!empty($having)) {
$this->having[] = $having;
}

return $this;
}

public function having($having) {
Deprecation::notice('3.0', 'Please use setHaving() or addHaving() instead!');
return $this->setHaving($having);
}

/**
* Set a WHERE clause.
*
* There are two different ways of doing this:
*
* <code>
* // the entire predicate as a single string
* $query->where("Column = 'Value'");
*
* // multiple predicates as an array
* $query->where(array("Column = 'Value'", "Column != 'Value'"));
* </code>
*
* @param string|array $where Predicate(s) to set, as escaped SQL statements.
* @return SQLQuery
*/
public function setWhere($where) {
$this->where = array();

$args = func_get_args();
if(isset($args[1])) {
Deprecation::notice('3.0', 'Multiple arguments to where is deprecated. Pleas use where("Column = Something") syntax instead');
}

return $this->addWhere($where);
}

/**
* Add a WHERE predicate.
*
* There are two different ways of doing this:
*
* <code>
* // the entire predicate as a single string
* $query->where("Column = 'Value'");
*
* // multiple predicates as an array
* $query->where(array("Column = 'Value'", "Column != 'Value'"));
* </code>
*
* @param string|array $where Predicate(s) to set, as escaped SQL statements.
* @return SQLQuery
*/
public function addWhere($where) {
if(is_array($where)) {
$this->where = array_merge($this->where, $where);
} elseif(!empty($where)) {
$this->where[] = $where;
}

return $this;
}

public function where($where) {
Deprecation::notice('3.0', 'Please use setWhere() or addWhere() instead!');
return $this->setWhere($where);
}

public function whereAny($where) {
Deprecation::notice('3.0', 'Please use setWhereAny() or setWhereAny() instead!');
return $this->setWhereAny($where);
}

/**
* @param String|array $filters Predicate(s) to set, as escaped SQL statements.
*/
function setWhereAny($filters) {
if(is_string($filters)) $filters = func_get_args();
$clause = implode(" OR ", $filters);
return $this->setWhere($clause);
}

/**
* @param String|array $filters Predicate(s) to set, as escaped SQL statements.
*/
function addWhereAny($filters) {
if(is_string($filters)) $filters = func_get_args();
$clause = implode(" OR ", $filters);
return $this->addWhere($clause);
}

/**
* Use the disjunctive operator 'OR' to join filter expressions in the WHERE clause.
*/
public function useDisjunction() {
$this->connective = 'OR';
}

/**
* Use the conjunctive operator 'AND' to join filter expressions in the WHERE clause.
*/
public function useConjunction() {
$this->connective = 'AND';
}

/**
* Swap the use of one table with another.
*
* @param string $old Name of the old table (unquoted, escaped)
* @param string $new Name of the new table (unquoted, escaped)
*/
function renameTable($old, $new) {
$this->replaceText("`$old`", "`$new`");
$this->replaceText("\"$old\"", "\"$new\"");
}

/**
* Swap some text in the SQL query with another.
*
* @param string $old The old text (escaped)
* @param string $new The new text (escaped)
*/
function replaceText($old, $new) {
$this->replacementsOld[] = $old;
$this->replacementsNew[] = $new;
}

public function getFilter() {
Deprecation::notice('3.0', 'Please use itemized filters in getWhere() instead of getFilter()');
return DB::getConn()->sqlWhereToString($this->getWhere(), $this->getConnective());
}

/**
* Return a list of FROM clauses used internally.
* @return array
*/
public function getFrom() {
return $this->from;
}

/**
* Return a list of HAVING clauses used internally.
* @return array
*/
public function getHaving() {
return $this->having;
}

/**
* Return a list of GROUP BY clauses used internally.
* @return array
*/
public function getGroupBy() {
return $this->groupby;
}

/**
* Return a list of WHERE clauses used internally.
* @return array
*/
public function getWhere() {
return $this->where;
}

/**
* Return an itemised select list as a map, where keys are the aliases, and values are the column sources.
* Aliases will always be provided (if the alias is implicit, the alias value will be inferred), and won't be quoted.
* E.g., 'Title' => '"SiteTree"."Title"'.
*/
public function getSelect() {
return $this->select;
}

/**
* Generate the SQL statement for this query.
*
* @return string
*/
function sql() {
// TODO: Don't require this internal-state manipulate-and-preserve - let sqlQueryToString() handle the new syntax
$origFrom = $this->from;

// Build from clauses
foreach($this->from as $alias => $join) {
// $join can be something like this array structure
// array('type' => 'inner', 'table' => 'SiteTree', 'filter' => array("SiteTree.ID = 1", "Status = 'approved'"))
if(is_array($join)) {
if(is_string($join['filter'])) $filter = $join['filter'];
else if(sizeof($join['filter']) == 1) $filter = $join['filter'][0];
else $filter = "(" . implode(") AND (", $join['filter']) . ")";

$aliasClause = ($alias != $join['table']) ? " AS \"" . Convert::raw2sql($alias) . "\"" : "";
$this->from[$alias] = strtoupper($join['type']) . " JOIN \"" . Convert::raw2sql($join['table']) . "\"$aliasClause ON $filter";
}
}

$sql = DB::getConn()->sqlQueryToString($this);

if($this->replacementsOld) {
$sql = str_replace($this->replacementsOld, $this->replacementsNew, $sql);
}

$this->from = $origFrom;

// The query was most likely just created and then exectued.
if($sql === 'SELECT *') {
return '';
}

return $sql;
}

/**
* Return the generated SQL string for this query
*
* @return string
*/
function __toString() {
try {
return $this->sql();
} catch(Exception $e) {
return "<sql query>";
}
}

/**
* Execute this query.
* @return SS_Query
*/
function execute() {
return DB::query($this->sql(), E_USER_ERROR);
}

/**
* Checks whether this query is for a specific ID in a table
*
* @todo Doesn't work with combined statements (e.g. "Foo='bar' AND ID=5")
*
* @return boolean
*/
function filtersOnID() {
$regexp = '/^(.*\.)?("|`)?ID("|`)?\s?=/';

// Sometimes the ID filter will be the 2nd element, if there's a ClasssName filter first.
if(isset($this->where[0]) && preg_match($regexp, $this->where[0])) return true;
if(isset($this->where[1]) && preg_match($regexp, $this->where[1])) return true;

return false;
}

/**
* Checks whether this query is filtering on a foreign key, ie finding a has_many relationship
*
* @todo Doesn't work with combined statements (e.g. "Foo='bar' AND ParentID=5")
*
* @return boolean
*/
function filtersOnFK() {
return (
$this->where
&& preg_match('/^(.*\.)?("|`)?[a-zA-Z]+ID("|`)?\s?=/', $this->where[0])
);
}

/// VARIOUS TRANSFORMATIONS BELOW

/**
* Return the number of rows in this query if the limit were removed. Useful in paged data sets.
* @return int
*/
function unlimitedRowCount($column = null) {
// we can't clear the select if we're relying on its output by a HAVING clause
if(count($this->having)) {
$records = $this->execute();
return $records->numRecords();
}

$clone = clone $this;
$clone->limit = null;
$clone->orderby = null;

// Choose a default column
if($column == null) {
if($this->groupby) {
$countQuery = new SQLQuery();
$countQuery->select("count(*)");
$countQuery->from = array('(' . $clone->sql() . ') all_distinct');

return $countQuery->execute()->value();

} else {
$clone->setSelect(array("count(*)"));
}
} else {
$clone->setSelect(array("count($column)"));
}

$clone->setGroupBy(array());;
return $clone->execute()->value();
}

/**
* Returns true if this query can be sorted by the given field.
*/
function canSortBy($fieldName) {
$fieldName = preg_replace('/(\s+?)(A|DE)SC$/', '', $fieldName);

return isset($this->select[$fieldName]);
}


/**
* Return the number of rows in this query if the limit were removed. Useful in paged data sets.
*
* @todo Respect HAVING and GROUPBY, which can affect the result-count
*
* @param String $column Quoted, escaped column name
* @return int
*/
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;
}
}

/**
* Return a new SQLQuery that calls the given aggregate functions on this data.
* @param $column An aggregate expression, such as 'MAX("Balance")', or a set of them (as an escaped SQL statement)
*/
function aggregate($column) {
if($this->groupby || $this->limit) {
throw new Exception("SQLQuery::aggregate() doesn't work with groupby or limit, yet");
}

$clone = clone $this;
$clone->setLimit(array());
$clone->setOrderBy(array());
$clone->setGroupBy(array());
$clone->setSelect($column);

return $clone;
}

/**
* 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->setLimit(1, $offset);
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->setLimit(1, $this->count() + $offset - 1);
return $query;
}

}

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