686 lines
19 KiB
PHP
686 lines
19 KiB
PHP
<?php
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/**
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* Object representing a SQL query.
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* The various parts of the SQL query can be manipulated individually.
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*
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* Caution: Only supports SELECT (default) and DELETE at the moment.
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*
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* @todo Add support for INSERT and UPDATE queries
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*
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* @package sapphire
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* @subpackage model
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*/
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class SQLQuery {
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/**
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* An array of fields to select.
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* @var array
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*/
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public $select = array();
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/**
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* An array of join clauses. The first one is just the table name.
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* @var array
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*/
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public $from = array();
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/**
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* An array of filters.
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* @var array
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*/
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public $where = array();
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/**
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* An ORDER BY clause.
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* @var string
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*/
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public $orderby;
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/**
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* An array of fields to group by.
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* @var array
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*/
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public $groupby = array();
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/**
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* An array of having clauses.
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* @var array
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*/
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public $having = array();
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/**
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* A limit clause.
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* @var string
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*/
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public $limit;
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/**
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* If this is true DISTINCT will be added to the SQL.
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* @var boolean
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*/
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public $distinct = false;
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/**
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* If this is true, this statement will delete rather than select.
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* @var boolean
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*/
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public $delete = false;
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/**
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* The logical connective used to join WHERE clauses. Defaults to AND.
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* @var string
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*/
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public $connective = 'AND';
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/**
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* Keep an internal register of find/replace pairs to execute when it's time to actually get the
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* query SQL.
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*/
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private $replacementsOld = array(), $replacementsNew = array();
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/**
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* Construct a new SQLQuery.
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*
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* @param array $select An array of fields to select.
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* @param array $from An array of join clauses. The first one should be just the table name.
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* @param array $where An array of filters, to be inserted into the WHERE clause.
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* @param string $orderby An ORDER BY clause.
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* @param array $groupby An array of fields to group by.
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* @param array $having An array of having clauses.
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* @param string $limit A LIMIT clause.
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*
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* TODO: perhaps we can quote things here instead of requiring all the parameters to be quoted
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* by this stage.
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*/
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function __construct($select = "*", $from = array(), $where = "", $orderby = "", $groupby = "", $having = "", $limit = "") {
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$this->select($select);
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// @todo
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$this->from = is_array($from) ? $from : array(str_replace(array('"','`'),'',$from) => $from);
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$this->where($where);
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$this->orderby($orderby);
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$this->groupby($groupby);
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$this->having($having);
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$this->limit($limit);
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}
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/**
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* Specify the list of columns to be selected by the query.
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*
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* <code>
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* // pass fields to select as single parameter array
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* $query->select(array("Col1","Col2"))->from("MyTable");
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*
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* // pass fields to select as multiple parameters
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* $query->select("Col1", "Col2")->from("MyTable");
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* </code>
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*
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* @param mixed $fields
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* @return SQLQuery
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*/
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public function select($fields) {
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if (func_num_args() > 1) {
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$this->select = func_get_args();
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} else {
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$this->select = is_array($fields) ? $fields : array($fields);
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}
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return $this;
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}
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/**
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* Add addition columns to the select clause
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*/
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public function selectMore($fields) {
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if (func_num_args() > 1) $fields = func_get_args();
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if(is_array($fields)) {
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foreach($fields as $field) $this->select[] = $field;
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} else {
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$this->select[] = $fields;
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}
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}
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/**
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* Return the SQL expression for the given field
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* @todo This should be refactored after $this->select is changed to make that easier
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*/
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public function expressionForField($field) {
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foreach($this->select as $sel) {
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if(preg_match('/AS +"?([^"]*)"?/i', $sel, $matches)) $selField = $matches[1];
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else if(preg_match('/"([^"]*)"\."([^"]*)"/', $sel, $matches)) $selField = $matches[2];
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else if(preg_match('/"?([^"]*)"?/', $sel, $matches)) $selField = $matches[2];
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if($selField == $field) return $sel;
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}
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}
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/**
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* Specify the target table to select from.
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*
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* <code>
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* $query->from("MyTable"); // SELECT * FROM MyTable
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* </code>
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*
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* @param string $table
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* @return SQLQuery This instance
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*/
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public function from($table) {
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$this->from[str_replace(array('"','`'),'',$table)] = $table;
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return $this;
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}
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/**
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* Add a LEFT JOIN criteria to the FROM clause.
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*
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* @param String $table Table name (unquoted)
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* @param String $onPredicate The "ON" SQL fragment in a "LEFT JOIN ... AS ... ON ..." statement.
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* Needs to be valid (quoted) SQL.
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* @param String $tableAlias Optional alias which makes it easier to identify and replace joins later on
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* @return SQLQuery This instance
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*/
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public function leftJoin($table, $onPredicate, $tableAlias=null) {
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if( !$tableAlias ) {
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$tableAlias = $table;
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}
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$this->from[$tableAlias] = array('type' => 'LEFT', 'table' => $table, 'filter' => array($onPredicate));
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return $this;
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}
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/**
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* Add an INNER JOIN criteria to the FROM clause.
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*
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* @param String $table Table name (unquoted)
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* @param String $onPredicate The "ON" SQL fragment in a "LEFT JOIN ... AS ... ON ..." statement.
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* Needs to be valid (quoted) SQL.
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* @param String $tableAlias Optional alias which makes it easier to identify and replace joins later on
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* @return SQLQuery This instance
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*/
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public function innerJoin($table, $onPredicate, $tableAlias=null) {
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if( !$tableAlias ) {
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$tableAlias = $table;
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}
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$this->from[$tableAlias] = array('type' => 'INNER', 'table' => $table, 'filter' => array($onPredicate));
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return $this;
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}
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/**
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* Add an additional filter (part of the ON clause) on a join
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*/
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public function addFilterToJoin($tableAlias, $filter) {
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$this->from[$tableAlias]['filter'][] = $filter;
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}
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/**
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* Replace the existing filter (ON clause) on a join
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*/
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public function setJoinFilter($tableAlias, $filter) {
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if(is_string($this->from[$tableAlias])) {Debug::message($tableAlias); Debug::dump($this->from);}
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$this->from[$tableAlias]['filter'] = array($filter);
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}
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/**
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* Returns true if we are already joining to the given table alias
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*/
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public function isJoinedTo($tableAlias) {
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return isset($this->from[$tableAlias]);
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}
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/**
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* Return a list of tables that this query is selecting from.
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*/
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public function queriedTables() {
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$tables = array();
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foreach($this->from as $key => $tableClause) {
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if(is_array($tableClause)) $table = '"'.$tableClause['table'].'"';
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else if(is_string($tableClause) && preg_match('/JOIN +("[^"]+") +(AS|ON) +/i', $tableClause, $matches)) $table = $matches[1];
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else $table = $tableClause;
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// Handle string replacements
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if($this->replacementsOld) $table = str_replace($this->replacementsOld, $this->replacementsNew, $table);
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$tables[] = preg_replace('/^"|"$/','',$table);
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}
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return $tables;
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}
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/**
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* Pass LIMIT clause either as SQL snippet or in array format.
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* Internally, limit will always be stored as a map containing the keys 'start' and 'limit'
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*
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* @param string|array $limit
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* @return SQLQuery This instance
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*/
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public function limit($limit) {
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if($limit && is_numeric($limit)) {
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$this->limit = array(
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'start' => 0,
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'limit' => $limit,
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);
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} else if($limit && is_string($limit)) {
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if(strpos($limit,',') !== false) list($start, $innerLimit) = explode(',', $limit, 2);
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else list($innerLimit, $start) = explode(' OFFSET ', strtoupper($limit), 2);
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$this->limit = array(
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'start' => trim($start),
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'limit' => trim($innerLimit),
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);
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} else {
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$this->limit = $limit;
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}
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return $this;
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}
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/**
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* Pass ORDER BY clause either as SQL snippet or in array format.
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*
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* @todo Implement passing of multiple orderby pairs in nested array syntax,
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* e.g. array(array('sort'=>'A','dir'=>'asc'),array('sort'=>'B'))
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*
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* @param string|array $orderby
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* @return SQLQuery This instance
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*/
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public function orderby($orderby) {
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// if passed as an array, assume two array values with column and direction (asc|desc)
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if(is_array($orderby)) {
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if(!array_key_exists('sort', $orderby)) user_error('SQLQuery::orderby(): Wrong format for $orderby array', E_USER_ERROR);
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if(isset($orderby['sort']) && !empty($orderby['sort']) && isset($orderby['dir']) && !empty($orderby['dir'])) {
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$combinedOrderby = "\"" . Convert::raw2sql($orderby['sort']) . "\" " . Convert::raw2sql(strtoupper($orderby['dir']));
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} elseif(isset($orderby['sort']) && !empty($orderby['sort'])) {
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$combinedOrderby = "\"" . Convert::raw2sql($orderby['sort']) . "\"";
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} else {
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$combinedOrderby = false;
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}
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} else {
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$combinedOrderby = $orderby;
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}
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// If sort contains a function call, let's move the sort clause into a separate selected field.
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// Some versions of MySQL choke if you have a group function referenced directly in the ORDER BY
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if($combinedOrderby && strpos($combinedOrderby,'(') !== false) {
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// Sort can be "Col1 DESC|ASC, Col2 DESC|ASC", we need to handle that
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$sortParts = explode(",", $combinedOrderby);
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// If you have select if(X,A,B),C then the array will return 'if(X','A','B)','C'.
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// Turn this into 'if(X,A,B)','C' by counting brackets
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while(list($i,$sortPart) = each($sortParts)) {
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while(substr_count($sortPart,'(') > substr_count($sortPart,')')) {
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list($i,$nextSortPart) = each($sortParts);
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if($i === null) break;
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$sortPart .= ',' . $nextSortPart;
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}
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$lumpedSortParts[] = $sortPart;
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}
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foreach($lumpedSortParts as $i => $sortPart) {
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$sortPart = trim($sortPart);
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if(substr(strtolower($sortPart),-5) == ' desc') {
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$this->select[] = substr($sortPart,0,-5) . " AS \"_SortColumn{$i}\"";
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$newSorts[] = "\"_SortColumn{$i}\" DESC";
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} else if(substr(strtolower($sortPart),-4) == ' asc') {
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$this->select[] = substr($sortPart,0,-4) . " AS \"_SortColumn{$i}\"";
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$newSorts[] = "\"_SortColumn{$i}\" ASC";
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} else {
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$this->select[] = "$sortPart AS \"_SortColumn{$i}\"";
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$newSorts[] = "\"_SortColumn{$i}\" ASC";
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}
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}
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$combinedOrderby = implode(", ", $newSorts);
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}
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if(!empty($combinedOrderby)) $this->orderby = $combinedOrderby;
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return $this;
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}
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/**
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* Add a GROUP BY clause.
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*
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* @param string|array $groupby
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* @return SQLQuery
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*/
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public function groupby($groupby) {
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if(is_array($groupby)) {
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$this->groupby = array_merge($this->groupby, $groupby);
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} elseif(!empty($groupby)) {
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$this->groupby[] = $groupby;
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}
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return $this;
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}
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/**
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* Add a HAVING clause.
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*
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* @param string|array $having
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* @return SQLQuery
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*/
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public function having($having) {
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if(is_array($having)) {
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$this->having = array_merge($this->having, $having);
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} elseif(!empty($having)) {
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$this->having[] = $having;
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}
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return $this;
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}
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/**
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* Apply a predicate filter to the where clause.
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*
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* Accepts a variable length of arguments, which represent
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* different ways of formatting a predicate in a where clause:
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*
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* <code>
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* // the entire predicate as a single string
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* $query->where("Column = 'Value'");
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*
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* // an exact match predicate with a key value pair
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* $query->where("Column", "Value");
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*
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* // a predicate with user defined operator
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* $query->where("Column", "!=", "Value");
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* </code>
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*
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*/
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public function where() {
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$args = func_get_args();
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if (func_num_args() == 3) {
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$filter = "{$args[0]} {$args[1]} '{$args[2]}'";
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} elseif (func_num_args() == 2) {
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$filter = "{$args[0]} = '{$args[1]}'";
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} else {
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$filter = $args[0];
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}
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if(is_array($filter)) {
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$this->where = array_merge($this->where,$filter);
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} elseif(!empty($filter)) {
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$this->where[] = $filter;
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}
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return $this;
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}
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/**
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*
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*/
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function whereAny($filters) {
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if(is_string($filters)) $filters = func_get_args();
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$clause = implode(" OR ", $filters);
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return $this->where($clause);
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}
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/**
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* Use the disjunctive operator 'OR' to join filter expressions in the WHERE clause.
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*/
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public function useDisjunction() {
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$this->connective = 'OR';
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}
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/**
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* Use the conjunctive operator 'AND' to join filter expressions in the WHERE clause.
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*/
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public function useConjunction() {
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$this->connective = 'AND';
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}
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/**
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* Swap the use of one table with another.
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* @param string $old Name of the old table.
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* @param string $new Name of the new table.
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*/
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function renameTable($old, $new) {
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$this->replaceText("`$old`", "`$new`");
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$this->replaceText("\"$old\"", "\"$new\"");
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}
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/**
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* Swap some text in the SQL query with another.
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* @param string $old The old text.
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* @param string $new The new text.
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*/
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function replaceText($old, $new) {
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$this->replacementsOld[] = $old;
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$this->replacementsNew[] = $new;
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}
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/**
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* Return an SQL WHERE clause to filter a SELECT query.
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*
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* @return string
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*/
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function getFilter() {
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return ($this->where) ? implode(") {$this->connective} (" , $this->where) : '';
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}
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/**
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* Generate the SQL statement for this query.
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*
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* @return string
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*/
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function sql() {
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// TODO: Don't require this internal-state manipulate-and-preserve - let sqlQueryToString() handle the new syntax
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$origFrom = $this->from;
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// Build from clauses
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foreach($this->from as $alias => $join) {
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// $join can be something like this array structure
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// array('type' => 'inner', 'table' => 'SiteTree', 'filter' => array("SiteTree.ID = 1", "Status = 'approved'"))
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if(is_array($join)) {
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if(is_string($join['filter'])) $filter = $join['filter'];
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else if(sizeof($join['filter']) == 1) $filter = $join['filter'][0];
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else $filter = "(" . implode(") AND (", $join['filter']) . ")";
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$aliasClause = ($alias != $join['table']) ? " AS \"$alias\"" : "";
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$this->from[$alias] = strtoupper($join['type']) . " JOIN \"{$join['table']}\"$aliasClause ON $filter";
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}
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}
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$sql = DB::getConn()->sqlQueryToString($this);
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if($this->replacementsOld) {
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$sql = str_replace($this->replacementsOld, $this->replacementsNew, $sql);
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}
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$this->from = $origFrom;
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// The query was most likely just created and then exectued.
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if($sql === 'SELECT *') {
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return '';
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}
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return $sql;
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}
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/**
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* Return the generated SQL string for this query
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*
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* @return string
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*/
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function __toString() {
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try {
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return $this->sql();
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} catch(Exception $e) {
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return "<sql query>";
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}
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}
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/**
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* Execute this query.
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* @return SS_Query
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*/
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function execute() {
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return DB::query($this->sql(), E_USER_ERROR);
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}
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/**
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* Checks whether this query is for a specific ID in a table
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*
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* @todo Doesn't work with combined statements (e.g. "Foo='bar' AND ID=5")
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*
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* @return boolean
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*/
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function filtersOnID() {
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$regexp = '/^(.*\.)?("|`)?ID("|`)?\s?=/';
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// Sometimes the ID filter will be the 2nd element, if there's a ClasssName filter first.
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if(isset($this->where[0]) && preg_match($regexp, $this->where[0])) return true;
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if(isset($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}"));
|
|
}
|
|
|
|
|
|
/**
|
|
* 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;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Return a new SQLQuery that calls the given aggregate functions on this data.
|
|
* @param $columns An aggregate expression, such as 'MAX("Balance")', or an array of them.
|
|
*/
|
|
function aggregate($columns) {
|
|
if(!is_array($columns)) $columns = array($columns);
|
|
|
|
if($this->groupby || $this->limit) {
|
|
throw new Exception("SQLQuery::aggregate() doesn't work with groupby or limit, yet");
|
|
}
|
|
|
|
$clone = clone $this;
|
|
$clone->limit = null;
|
|
$clone->orderby = null;
|
|
$clone->groupby = null;
|
|
$clone->select = $columns;
|
|
|
|
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->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;
|
|
}
|
|
|
|
}
|
|
|
|
?>
|