496 lines
13 KiB
PHP
496 lines
13 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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* 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[$tableAlias] = "LEFT JOIN \"$table\" AS \"$tableAlias\" ON $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[$tableAlias] = "INNER JOIN \"$table\" AS \"$tableAlias\" ON $onPredicate";
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return $this;
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}
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/**
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* Returns true if we are already joining to the given table alias
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*/
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public function isJoinedTo($tableAlias) {
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return isset($this->from[$tableAlias]);
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}
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/**
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* Pass LIMIT clause either as SQL snippet or in array format.
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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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$this->limit = $limit;
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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($combinedOrderby,'(') !== false && strtoupper(trim($combinedOrderby)) != DB::getConn()->random()) {
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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 $this;
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}
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/**
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* Use the disjunctive operator 'OR' to join filter expressions in the WHERE clause.
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*/
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public function useDisjunction() {
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$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} (" , $this->where) : '';
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}
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/**
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* Generate the SQL statement for this query.
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*
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* @return string
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*/
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function sql() {
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// Don't process empty queries
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$select = is_array($this->select) ? $this->select[0] : $this->select;
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if($select == '*' && !$this->from) return '';
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$sql = DB::getConn()->sqlQueryToString($this);
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if($this->replacementsOld) $sql = str_replace($this->replacementsOld, $this->replacementsNew, $sql);
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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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return $this->sql();
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}
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/**
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* Execute this query.
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* @return SS_Query
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*/
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function execute() {
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return DB::query($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, $this->where[1])) return true;
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return false;
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}
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/**
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* Checks whether this query is filtering on a foreign key, ie finding a has_many relationship
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*
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* @todo Doesn't work with combined statements (e.g. "Foo='bar' AND ParentID=5")
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*
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* @return boolean
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*/
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function filtersOnFK() {
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return (
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$this->where
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&& preg_match('/^(.*\.)?("|`)?[a-zA-Z]+ID("|`)?\s?=/', $this->where[0])
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);
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}
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/// VARIOUS TRANSFORMATIONS BELOW
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/**
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* Return the number of rows in this query if the limit were removed. Useful in paged data sets.
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* @return int
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*/
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function unlimitedRowCount( $column = null) {
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// we can't clear the select if we're relying on its output by a HAVING clause
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if(count($this->having)) {
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$records = $this->execute();
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return $records->numRecords();
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}
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$clone = clone $this;
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$clone->limit = null;
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$clone->orderby = null;
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// Choose a default column
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if($column == null) {
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if($this->groupby) {
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$countQuery = new SQLQuery();
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$countQuery->select = array("count(*)");
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$countQuery->from = array('(' . $clone->sql() . ') all_distinct');
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return $countQuery->execute()->value();
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} else {
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$clone->select = array("count(*)");
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}
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} else {
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$clone->select = array("count($column)");
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}
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$clone->groupby = null;
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return $clone->execute()->value();
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}
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/**
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* Returns true if this query can be sorted by the given field.
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* Note that the implementation of this method is a little crude at the moment, it wil return
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* "false" more often that is strictly necessary.
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*/
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function canSortBy($fieldName) {
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$fieldName = preg_replace('/(\s+?)(A|DE)SC$/', '', $fieldName);
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$sql = $this->sql();
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$selects = $this->select;
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foreach($selects as $i => $sel) {
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if (preg_match('/"(.*)"\."(.*)"/', $sel, $matches)) $selects[$i] = $matches[2];
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}
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$SQL_fieldName = Convert::raw2sql($fieldName);
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return (in_array($SQL_fieldName,$selects) || stripos($sql,"AS {$SQL_fieldName}"));
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}
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}
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?>
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