mirror of
https://github.com/silverstripe/silverstripe-framework
synced 2024-10-22 14:05:37 +02:00
492 lines
13 KiB
PHP
Executable File
492 lines
13 KiB
PHP
Executable File
<?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 sapphire
|
|
* @subpackage model
|
|
*/
|
|
class SQLQuery {
|
|
|
|
/**
|
|
* An array of fields to select.
|
|
* @var array
|
|
*/
|
|
public $select = array();
|
|
|
|
/**
|
|
* An array of join clauses. The first one is just the table name.
|
|
* @var array
|
|
*/
|
|
public $from = array();
|
|
|
|
/**
|
|
* An array of filters.
|
|
* @var array
|
|
*/
|
|
public $where = array();
|
|
|
|
/**
|
|
* An ORDER BY clause.
|
|
* @var string
|
|
*/
|
|
public $orderby;
|
|
|
|
/**
|
|
* An array of fields to group by.
|
|
* @var array
|
|
*/
|
|
public $groupby = array();
|
|
|
|
/**
|
|
* An array of having clauses.
|
|
* @var array
|
|
*/
|
|
public $having = array();
|
|
|
|
/**
|
|
* A limit clause.
|
|
* @var string
|
|
*/
|
|
public $limit;
|
|
|
|
/**
|
|
* If this is true DISTINCT will be added to the SQL.
|
|
* @var boolean
|
|
*/
|
|
public $distinct = false;
|
|
|
|
/**
|
|
* If this is true, this statement will delete rather than select.
|
|
* @var boolean
|
|
*/
|
|
public $delete = false;
|
|
|
|
/**
|
|
* The logical connective used to join WHERE clauses. Defaults to AND.
|
|
* @var string
|
|
*/
|
|
public $connective = 'AND';
|
|
|
|
/**
|
|
* Keep an internal register of find/replace pairs to execute when it's time to actually get the
|
|
* query SQL.
|
|
*/
|
|
private $replacementsOld = array(), $replacementsNew = array();
|
|
|
|
/**
|
|
* Construct a new SQLQuery.
|
|
*
|
|
* @param array $select An array of fields to select.
|
|
* @param array $from An array of join clauses. The first one should be just the table name.
|
|
* @param array $where An array of filters, to be inserted into the WHERE clause.
|
|
* @param string $orderby An ORDER BY clause.
|
|
* @param array $groupby An array of fields to group by.
|
|
* @param array $having An array of having clauses.
|
|
* @param string $limit A LIMIT clause.
|
|
*
|
|
* TODO: perhaps we can quote things here instead of requiring all the parameters to be quoted
|
|
* by this stage.
|
|
*/
|
|
function __construct($select = "*", $from = array(), $where = "", $orderby = "", $groupby = "", $having = "", $limit = "") {
|
|
$this->select($select);
|
|
// @todo
|
|
$this->from = is_array($from) ? $from : array(str_replace(array('"','`'),'',$from) => $from);
|
|
$this->where($where);
|
|
$this->orderby($orderby);
|
|
$this->groupby($groupby);
|
|
$this->having($having);
|
|
$this->limit($limit);
|
|
}
|
|
|
|
/**
|
|
* Specify the list of columns to be selected by the query.
|
|
*
|
|
* <code>
|
|
* // pass fields to select as single parameter array
|
|
* $query->select(array("Col1","Col2"))->from("MyTable");
|
|
*
|
|
* // pass fields to select as multiple parameters
|
|
* $query->select("Col1", "Col2")->from("MyTable");
|
|
* </code>
|
|
*
|
|
* @param mixed $fields
|
|
* @return SQLQuery
|
|
*/
|
|
public function select($fields) {
|
|
if (func_num_args() > 1) {
|
|
$this->select = func_get_args();
|
|
} else {
|
|
$this->select = is_array($fields) ? $fields : array($fields);
|
|
}
|
|
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Specify the target table to select from.
|
|
*
|
|
* <code>
|
|
* $query->from("MyTable"); // SELECT * FROM MyTable
|
|
* </code>
|
|
*
|
|
* @param string $table
|
|
* @return SQLQuery This instance
|
|
*/
|
|
public function from($table) {
|
|
$this->from[str_replace(array('"','`'),'',$table)] = $table;
|
|
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Add a LEFT JOIN criteria to the FROM clause.
|
|
*
|
|
* @param String $table Table name (unquoted)
|
|
* @param String $onPredicate The "ON" SQL fragment in a "LEFT JOIN ... AS ... ON ..." statement.
|
|
* Needs to be valid (quoted) SQL.
|
|
* @param String $tableAlias Optional alias which makes it easier to identify and replace joins later on
|
|
* @return SQLQuery This instance
|
|
*/
|
|
public function leftJoin($table, $onPredicate, $tableAlias=null) {
|
|
if( !$tableAlias ) {
|
|
$tableAlias = $table;
|
|
}
|
|
$this->from[$tableAlias] = "LEFT JOIN \"$table\" AS \"$tableAlias\" ON $onPredicate";
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Add an INNER JOIN criteria to the FROM clause.
|
|
*
|
|
* @param String $table Table name (unquoted)
|
|
* @param String $onPredicate The "ON" SQL fragment in a "LEFT JOIN ... AS ... ON ..." statement.
|
|
* Needs to be valid (quoted) SQL.
|
|
* @param String $tableAlias Optional alias which makes it easier to identify and replace joins later on
|
|
* @return SQLQuery This instance
|
|
*/
|
|
public function innerJoin($table, $onPredicate, $tableAlias=null) {
|
|
if( !$tableAlias ) {
|
|
$tableAlias = $table;
|
|
}
|
|
$this->from[$tableAlias] = "INNER JOIN \"$table\" AS \"$tableAlias\" ON $onPredicate";
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Returns true if we are already joining to the given table alias
|
|
*/
|
|
public function isJoinedTo($tableAlias) {
|
|
return isset($this->from[$tableAlias]);
|
|
}
|
|
|
|
/**
|
|
* Pass LIMIT clause either as SQL snippet or in array format.
|
|
*
|
|
* @param string|array $limit
|
|
* @return SQLQuery This instance
|
|
*/
|
|
public function limit($limit) {
|
|
$this->limit = $limit;
|
|
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Pass ORDER BY clause either as SQL snippet or in array format.
|
|
*
|
|
* @todo Implement passing of multiple orderby pairs in nested array syntax,
|
|
* e.g. array(array('sort'=>'A','dir'=>'asc'),array('sort'=>'B'))
|
|
*
|
|
* @param string|array $orderby
|
|
* @return SQLQuery This instance
|
|
*/
|
|
public function orderby($orderby) {
|
|
// if passed as an array, assume two array values with column and direction (asc|desc)
|
|
if(is_array($orderby)) {
|
|
if(!array_key_exists('sort', $orderby)) user_error('SQLQuery::orderby(): Wrong format for $orderby array', E_USER_ERROR);
|
|
|
|
if(isset($orderby['sort']) && !empty($orderby['sort']) && isset($orderby['dir']) && !empty($orderby['dir'])) {
|
|
$combinedOrderby = "\"" . Convert::raw2sql($orderby['sort']) . "\" " . Convert::raw2sql(strtoupper($orderby['dir']));
|
|
} elseif(isset($orderby['sort']) && !empty($orderby['sort'])) {
|
|
$combinedOrderby = "\"" . Convert::raw2sql($orderby['sort']) . "\"";
|
|
} else {
|
|
$combinedOrderby = false;
|
|
}
|
|
} else {
|
|
$combinedOrderby = $orderby;
|
|
}
|
|
|
|
// If sort contains a function call, let's move the sort clause into a separate selected field.
|
|
// Some versions of MySQL choke if you have a group function referenced directly in the ORDER BY
|
|
if($combinedOrderby && strpos($combinedOrderby,'(') !== false && strtoupper(trim($combinedOrderby)) != DB::getConn()->random()) {
|
|
// Sort can be "Col1 DESC|ASC, Col2 DESC|ASC", we need to handle that
|
|
$sortParts = explode(",", $combinedOrderby);
|
|
|
|
// If you have select if(X,A,B),C then the array will return 'if(X','A','B)','C'.
|
|
// Turn this into 'if(X,A,B)','C' by counting brackets
|
|
while(list($i,$sortPart) = each($sortParts)) {
|
|
while(substr_count($sortPart,'(') > substr_count($sortPart,')')) {
|
|
list($i,$nextSortPart) = each($sortParts);
|
|
if($i === null) break;
|
|
$sortPart .= ',' . $nextSortPart;
|
|
}
|
|
$lumpedSortParts[] = $sortPart;
|
|
}
|
|
|
|
foreach($lumpedSortParts as $i => $sortPart) {
|
|
$sortPart = trim($sortPart);
|
|
if(substr(strtolower($sortPart),-5) == ' desc') {
|
|
$this->select[] = substr($sortPart,0,-5) . " AS \"_SortColumn{$i}\"";
|
|
$newSorts[] = "\"_SortColumn{$i}\" DESC";
|
|
} else if(substr(strtolower($sortPart),-4) == ' asc') {
|
|
$this->select[] = substr($sortPart,0,-4) . " AS \"_SortColumn{$i}\"";
|
|
$newSorts[] = "\"_SortColumn{$i}\" ASC";
|
|
} else {
|
|
$this->select[] = "$sortPart AS \"_SortColumn{$i}\"";
|
|
$newSorts[] = "\"_SortColumn{$i}\" ASC";
|
|
}
|
|
}
|
|
|
|
$combinedOrderby = implode(", ", $newSorts);
|
|
}
|
|
|
|
if(!empty($combinedOrderby)) $this->orderby = $combinedOrderby;
|
|
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Add a GROUP BY clause.
|
|
*
|
|
* @param string|array $groupby
|
|
* @return SQLQuery
|
|
*/
|
|
public function groupby($groupby) {
|
|
if(is_array($groupby)) {
|
|
$this->groupby = array_merge($this->groupby, $groupby);
|
|
} elseif(!empty($groupby)) {
|
|
$this->groupby[] = $groupby;
|
|
}
|
|
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Add a HAVING clause.
|
|
*
|
|
* @param string|array $having
|
|
* @return SQLQuery
|
|
*/
|
|
public function having($having) {
|
|
if(is_array($having)) {
|
|
$this->having = array_merge($this->having, $having);
|
|
} elseif(!empty($having)) {
|
|
$this->having[] = $having;
|
|
}
|
|
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Apply a predicate filter to the where clause.
|
|
*
|
|
* Accepts a variable length of arguments, which represent
|
|
* different ways of formatting a predicate in a where clause:
|
|
*
|
|
* <code>
|
|
* // the entire predicate as a single string
|
|
* $query->where("Column = 'Value'");
|
|
*
|
|
* // an exact match predicate with a key value pair
|
|
* $query->where("Column", "Value");
|
|
*
|
|
* // a predicate with user defined operator
|
|
* $query->where("Column", "!=", "Value");
|
|
* </code>
|
|
*
|
|
*/
|
|
public function where() {
|
|
$args = func_get_args();
|
|
if (func_num_args() == 3) {
|
|
$filter = "{$args[0]} {$args[1]} '{$args[2]}'";
|
|
} elseif (func_num_args() == 2) {
|
|
$filter = "{$args[0]} = '{$args[1]}'";
|
|
} else {
|
|
$filter = $args[0];
|
|
}
|
|
|
|
if(is_array($filter)) {
|
|
$this->where = array_merge($this->where,$filter);
|
|
} elseif(!empty($filter)) {
|
|
$this->where[] = $filter;
|
|
}
|
|
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* 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.
|
|
* @param string $new Name of the new table.
|
|
*/
|
|
function renameTable($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.
|
|
* @param string $new The new text.
|
|
*/
|
|
function replaceText($old, $new) {
|
|
$this->replacementsOld[] = $old;
|
|
$this->replacementsNew[] = $new;
|
|
}
|
|
|
|
/**
|
|
* Return an SQL WHERE clause to filter a SELECT query.
|
|
*
|
|
* @return string
|
|
*/
|
|
function getFilter() {
|
|
return ($this->where) ? implode(") {$this->connective} (" , $this->where) : '';
|
|
}
|
|
|
|
/**
|
|
* Generate the SQL statement for this query.
|
|
*
|
|
* @return string
|
|
*/
|
|
function sql() {
|
|
$sql = DB::getConn()->sqlQueryToString($this);
|
|
if($this->replacementsOld) $sql = str_replace($this->replacementsOld, $this->replacementsNew, $sql);
|
|
return $sql;
|
|
}
|
|
|
|
/**
|
|
* Return the generated SQL string for this query
|
|
*
|
|
* @return string
|
|
*/
|
|
function __toString() {
|
|
return $this->sql();
|
|
}
|
|
|
|
/**
|
|
* Execute this query.
|
|
* @return SS_Query
|
|
*/
|
|
function execute() {
|
|
return DB::query($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 = array("count(*)");
|
|
$countQuery->from = array('(' . $clone->sql() . ') all_distinct');
|
|
|
|
return $countQuery->execute()->value();
|
|
|
|
} else {
|
|
$clone->select = array("count(*)");
|
|
}
|
|
} else {
|
|
$clone->select = array("count($column)");
|
|
}
|
|
|
|
$clone->groupby = null;
|
|
return $clone->execute()->value();
|
|
}
|
|
|
|
/**
|
|
* Returns true if this query can be sorted by the given field.
|
|
* Note that the implementation of this method is a little crude at the moment, it wil return
|
|
* "false" more often that is strictly necessary.
|
|
*/
|
|
function canSortBy($fieldName) {
|
|
$fieldName = preg_replace('/(\s+?)(A|DE)SC$/', '', $fieldName);
|
|
|
|
$sql = $this->sql();
|
|
|
|
$selects = $this->select;
|
|
foreach($selects as $i => $sel) {
|
|
if (preg_match('/"(.*)"\."(.*)"/', $sel, $matches)) $selects[$i] = $matches[2];
|
|
}
|
|
|
|
$SQL_fieldName = Convert::raw2sql($fieldName);
|
|
return (in_array($SQL_fieldName,$selects) || stripos($sql,"AS {$SQL_fieldName}"));
|
|
}
|
|
|
|
}
|
|
|
|
?>
|