747 lines
22 KiB
PHP
747 lines
22 KiB
PHP
<?php
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/**
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* Meta API: WP_Meta_Query class
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*
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* @package WordPress
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* @subpackage Meta
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* @since 4.4.0
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*/
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/**
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* Core class used to implement meta queries for the Meta API.
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*
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* Used for generating SQL clauses that filter a primary query according to metadata keys and values.
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*
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* WP_Meta_Query is a helper that allows primary query classes, such as WP_Query and WP_User_Query,
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*
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* to filter their results by object metadata, by generating `JOIN` and `WHERE` subclauses to be attached
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* to the primary SQL query string.
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*
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* @since 3.2.0
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* @package WordPress
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* @subpackage Meta
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*/
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class WP_Meta_Query {
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/**
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* Array of metadata queries.
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*
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* See WP_Meta_Query::__construct() for information on meta query arguments.
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*
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* @since 3.2.0
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* @access public
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* @var array
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*/
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public $queries = array();
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/**
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* The relation between the queries. Can be one of 'AND' or 'OR'.
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*
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* @since 3.2.0
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* @access public
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* @var string
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*/
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public $relation;
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/**
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* Database table to query for the metadata.
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*
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* @since 4.1.0
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* @access public
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* @var string
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*/
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public $meta_table;
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/**
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* Column in meta_table that represents the ID of the object the metadata belongs to.
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*
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* @since 4.1.0
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* @access public
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* @var string
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*/
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public $meta_id_column;
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/**
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* Database table that where the metadata's objects are stored (eg $wpdb->users).
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*
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* @since 4.1.0
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* @access public
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* @var string
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*/
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public $primary_table;
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/**
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* Column in primary_table that represents the ID of the object.
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*
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* @since 4.1.0
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* @access public
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* @var string
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*/
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public $primary_id_column;
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/**
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* A flat list of table aliases used in JOIN clauses.
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*
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* @since 4.1.0
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* @access protected
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* @var array
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*/
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protected $table_aliases = array();
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/**
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* A flat list of clauses, keyed by clause 'name'.
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*
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* @since 4.2.0
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* @access protected
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* @var array
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*/
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protected $clauses = array();
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/**
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* Whether the query contains any OR relations.
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*
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* @since 4.3.0
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* @access protected
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* @var bool
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*/
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protected $has_or_relation = false;
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/**
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* Constructor.
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*
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* @since 3.2.0
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* @since 4.2.0 Introduced support for naming query clauses by associative array keys.
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*
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* @access public
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*
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* @param array $meta_query {
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* Array of meta query clauses. When first-order clauses use strings as their array keys, they may be
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* referenced in the 'orderby' parameter of the parent query.
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*
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* @type string $relation Optional. The MySQL keyword used to join
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* the clauses of the query. Accepts 'AND', or 'OR'. Default 'AND'.
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* @type array {
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* Optional. An array of first-order clause parameters, or another fully-formed meta query.
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*
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* @type string $key Meta key to filter by.
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* @type string $value Meta value to filter by.
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* @type string $compare MySQL operator used for comparing the $value. Accepts '=',
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* '!=', '>', '>=', '<', '<=', 'LIKE', 'NOT LIKE',
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* 'IN', 'NOT IN', 'BETWEEN', 'NOT BETWEEN', 'REGEXP',
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* 'NOT REGEXP', 'RLIKE', 'EXISTS' or 'NOT EXISTS'.
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* Default is 'IN' when `$value` is an array, '=' otherwise.
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* @type string $type MySQL data type that the meta_value column will be CAST to for
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* comparisons. Accepts 'NUMERIC', 'BINARY', 'CHAR', 'DATE',
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* 'DATETIME', 'DECIMAL', 'SIGNED', 'TIME', or 'UNSIGNED'.
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* Default is 'CHAR'.
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* }
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* }
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*/
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public function __construct( $meta_query = false ) {
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if ( !$meta_query )
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return;
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if ( isset( $meta_query['relation'] ) && strtoupper( $meta_query['relation'] ) == 'OR' ) {
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$this->relation = 'OR';
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} else {
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$this->relation = 'AND';
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}
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$this->queries = $this->sanitize_query( $meta_query );
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}
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/**
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* Ensure the 'meta_query' argument passed to the class constructor is well-formed.
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*
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* Eliminates empty items and ensures that a 'relation' is set.
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*
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* @since 4.1.0
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* @access public
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*
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* @param array $queries Array of query clauses.
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* @return array Sanitized array of query clauses.
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*/
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public function sanitize_query( $queries ) {
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$clean_queries = array();
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if ( ! is_array( $queries ) ) {
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return $clean_queries;
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}
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foreach ( $queries as $key => $query ) {
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if ( 'relation' === $key ) {
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$relation = $query;
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} elseif ( ! is_array( $query ) ) {
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continue;
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// First-order clause.
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} elseif ( $this->is_first_order_clause( $query ) ) {
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if ( isset( $query['value'] ) && array() === $query['value'] ) {
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unset( $query['value'] );
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}
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$clean_queries[ $key ] = $query;
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// Otherwise, it's a nested query, so we recurse.
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} else {
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$cleaned_query = $this->sanitize_query( $query );
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if ( ! empty( $cleaned_query ) ) {
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$clean_queries[ $key ] = $cleaned_query;
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}
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}
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}
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if ( empty( $clean_queries ) ) {
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return $clean_queries;
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}
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// Sanitize the 'relation' key provided in the query.
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if ( isset( $relation ) && 'OR' === strtoupper( $relation ) ) {
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$clean_queries['relation'] = 'OR';
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$this->has_or_relation = true;
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/*
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* If there is only a single clause, call the relation 'OR'.
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* This value will not actually be used to join clauses, but it
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* simplifies the logic around combining key-only queries.
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*/
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} elseif ( 1 === count( $clean_queries ) ) {
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$clean_queries['relation'] = 'OR';
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// Default to AND.
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} else {
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$clean_queries['relation'] = 'AND';
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}
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return $clean_queries;
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}
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/**
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* Determine whether a query clause is first-order.
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*
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* A first-order meta query clause is one that has either a 'key' or
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* a 'value' array key.
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*
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* @since 4.1.0
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* @access protected
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*
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* @param array $query Meta query arguments.
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* @return bool Whether the query clause is a first-order clause.
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*/
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protected function is_first_order_clause( $query ) {
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return isset( $query['key'] ) || isset( $query['value'] );
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}
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/**
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* Constructs a meta query based on 'meta_*' query vars
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*
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* @since 3.2.0
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* @access public
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*
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* @param array $qv The query variables
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*/
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public function parse_query_vars( $qv ) {
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$meta_query = array();
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/*
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* For orderby=meta_value to work correctly, simple query needs to be
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* first (so that its table join is against an unaliased meta table) and
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* needs to be its own clause (so it doesn't interfere with the logic of
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* the rest of the meta_query).
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*/
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$primary_meta_query = array();
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foreach ( array( 'key', 'compare', 'type' ) as $key ) {
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if ( ! empty( $qv[ "meta_$key" ] ) ) {
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$primary_meta_query[ $key ] = $qv[ "meta_$key" ];
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}
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}
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// WP_Query sets 'meta_value' = '' by default.
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if ( isset( $qv['meta_value'] ) && '' !== $qv['meta_value'] && ( ! is_array( $qv['meta_value'] ) || $qv['meta_value'] ) ) {
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$primary_meta_query['value'] = $qv['meta_value'];
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}
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$existing_meta_query = isset( $qv['meta_query'] ) && is_array( $qv['meta_query'] ) ? $qv['meta_query'] : array();
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if ( ! empty( $primary_meta_query ) && ! empty( $existing_meta_query ) ) {
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$meta_query = array(
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'relation' => 'AND',
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$primary_meta_query,
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$existing_meta_query,
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);
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} elseif ( ! empty( $primary_meta_query ) ) {
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$meta_query = array(
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$primary_meta_query,
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);
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} elseif ( ! empty( $existing_meta_query ) ) {
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$meta_query = $existing_meta_query;
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}
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$this->__construct( $meta_query );
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}
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/**
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* Return the appropriate alias for the given meta type if applicable.
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*
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* @since 3.7.0
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* @access public
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*
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* @param string $type MySQL type to cast meta_value.
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* @return string MySQL type.
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*/
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public function get_cast_for_type( $type = '' ) {
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if ( empty( $type ) )
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return 'CHAR';
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$meta_type = strtoupper( $type );
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if ( ! preg_match( '/^(?:BINARY|CHAR|DATE|DATETIME|SIGNED|UNSIGNED|TIME|NUMERIC(?:\(\d+(?:,\s?\d+)?\))?|DECIMAL(?:\(\d+(?:,\s?\d+)?\))?)$/', $meta_type ) )
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return 'CHAR';
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if ( 'NUMERIC' == $meta_type )
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$meta_type = 'SIGNED';
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return $meta_type;
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}
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/**
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* Generates SQL clauses to be appended to a main query.
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*
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* @since 3.2.0
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* @access public
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*
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* @param string $type Type of meta, eg 'user', 'post'.
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* @param string $primary_table Database table where the object being filtered is stored (eg wp_users).
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* @param string $primary_id_column ID column for the filtered object in $primary_table.
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* @param object $context Optional. The main query object.
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* @return false|array {
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* Array containing JOIN and WHERE SQL clauses to append to the main query.
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*
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* @type string $join SQL fragment to append to the main JOIN clause.
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* @type string $where SQL fragment to append to the main WHERE clause.
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* }
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*/
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public function get_sql( $type, $primary_table, $primary_id_column, $context = null ) {
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if ( ! $meta_table = _get_meta_table( $type ) ) {
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return false;
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}
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$this->meta_table = $meta_table;
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$this->meta_id_column = sanitize_key( $type . '_id' );
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$this->primary_table = $primary_table;
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$this->primary_id_column = $primary_id_column;
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$sql = $this->get_sql_clauses();
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/*
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* If any JOINs are LEFT JOINs (as in the case of NOT EXISTS), then all JOINs should
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* be LEFT. Otherwise posts with no metadata will be excluded from results.
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*/
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if ( false !== strpos( $sql['join'], 'LEFT JOIN' ) ) {
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$sql['join'] = str_replace( 'INNER JOIN', 'LEFT JOIN', $sql['join'] );
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}
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/**
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* Filter the meta query's generated SQL.
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*
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* @since 3.1.0
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*
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* @param array $clauses Array containing the query's JOIN and WHERE clauses.
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* @param array $queries Array of meta queries.
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* @param string $type Type of meta.
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* @param string $primary_table Primary table.
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* @param string $primary_id_column Primary column ID.
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* @param object $context The main query object.
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*/
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return apply_filters_ref_array( 'get_meta_sql', array( $sql, $this->queries, $type, $primary_table, $primary_id_column, $context ) );
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}
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/**
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* Generate SQL clauses to be appended to a main query.
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*
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* Called by the public WP_Meta_Query::get_sql(), this method is abstracted
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* out to maintain parity with the other Query classes.
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*
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* @since 4.1.0
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* @access protected
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*
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* @return array {
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* Array containing JOIN and WHERE SQL clauses to append to the main query.
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*
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* @type string $join SQL fragment to append to the main JOIN clause.
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* @type string $where SQL fragment to append to the main WHERE clause.
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* }
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*/
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protected function get_sql_clauses() {
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/*
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* $queries are passed by reference to get_sql_for_query() for recursion.
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* To keep $this->queries unaltered, pass a copy.
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*/
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$queries = $this->queries;
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$sql = $this->get_sql_for_query( $queries );
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if ( ! empty( $sql['where'] ) ) {
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$sql['where'] = ' AND ' . $sql['where'];
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}
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return $sql;
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}
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/**
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* Generate SQL clauses for a single query array.
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*
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* If nested subqueries are found, this method recurses the tree to
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* produce the properly nested SQL.
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*
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* @since 4.1.0
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* @access protected
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*
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* @param array $query Query to parse, passed by reference.
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* @param int $depth Optional. Number of tree levels deep we currently are.
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* Used to calculate indentation. Default 0.
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* @return array {
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* Array containing JOIN and WHERE SQL clauses to append to a single query array.
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*
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* @type string $join SQL fragment to append to the main JOIN clause.
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* @type string $where SQL fragment to append to the main WHERE clause.
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* }
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*/
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protected function get_sql_for_query( &$query, $depth = 0 ) {
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$sql_chunks = array(
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'join' => array(),
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'where' => array(),
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);
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$sql = array(
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'join' => '',
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'where' => '',
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);
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$indent = '';
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for ( $i = 0; $i < $depth; $i++ ) {
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$indent .= " ";
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}
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foreach ( $query as $key => &$clause ) {
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if ( 'relation' === $key ) {
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$relation = $query['relation'];
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} elseif ( is_array( $clause ) ) {
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// This is a first-order clause.
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if ( $this->is_first_order_clause( $clause ) ) {
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$clause_sql = $this->get_sql_for_clause( $clause, $query, $key );
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$where_count = count( $clause_sql['where'] );
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if ( ! $where_count ) {
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$sql_chunks['where'][] = '';
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} elseif ( 1 === $where_count ) {
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$sql_chunks['where'][] = $clause_sql['where'][0];
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} else {
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$sql_chunks['where'][] = '( ' . implode( ' AND ', $clause_sql['where'] ) . ' )';
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}
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$sql_chunks['join'] = array_merge( $sql_chunks['join'], $clause_sql['join'] );
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// This is a subquery, so we recurse.
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} else {
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$clause_sql = $this->get_sql_for_query( $clause, $depth + 1 );
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$sql_chunks['where'][] = $clause_sql['where'];
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$sql_chunks['join'][] = $clause_sql['join'];
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}
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}
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}
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// Filter to remove empties.
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$sql_chunks['join'] = array_filter( $sql_chunks['join'] );
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$sql_chunks['where'] = array_filter( $sql_chunks['where'] );
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if ( empty( $relation ) ) {
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$relation = 'AND';
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}
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// Filter duplicate JOIN clauses and combine into a single string.
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if ( ! empty( $sql_chunks['join'] ) ) {
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$sql['join'] = implode( ' ', array_unique( $sql_chunks['join'] ) );
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}
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// Generate a single WHERE clause with proper brackets and indentation.
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if ( ! empty( $sql_chunks['where'] ) ) {
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$sql['where'] = '( ' . "\n " . $indent . implode( ' ' . "\n " . $indent . $relation . ' ' . "\n " . $indent, $sql_chunks['where'] ) . "\n" . $indent . ')';
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}
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return $sql;
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}
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|
|
/**
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|
* Generate SQL JOIN and WHERE clauses for a first-order query clause.
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*
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|
* "First-order" means that it's an array with a 'key' or 'value'.
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|
*
|
|
* @since 4.1.0
|
|
* @access public
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|
*
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|
* @global wpdb $wpdb WordPress database abstraction object.
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|
*
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* @param array $clause Query clause, passed by reference.
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* @param array $parent_query Parent query array.
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* @param string $clause_key Optional. The array key used to name the clause in the original `$meta_query`
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* parameters. If not provided, a key will be generated automatically.
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* @return array {
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* Array containing JOIN and WHERE SQL clauses to append to a first-order query.
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*
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* @type string $join SQL fragment to append to the main JOIN clause.
|
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* @type string $where SQL fragment to append to the main WHERE clause.
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* }
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*/
|
|
public function get_sql_for_clause( &$clause, $parent_query, $clause_key = '' ) {
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global $wpdb;
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|
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$sql_chunks = array(
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'where' => array(),
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'join' => array(),
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);
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|
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if ( isset( $clause['compare'] ) ) {
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$clause['compare'] = strtoupper( $clause['compare'] );
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} else {
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$clause['compare'] = isset( $clause['value'] ) && is_array( $clause['value'] ) ? 'IN' : '=';
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}
|
|
|
|
if ( ! in_array( $clause['compare'], array(
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'=', '!=', '>', '>=', '<', '<=',
|
|
'LIKE', 'NOT LIKE',
|
|
'IN', 'NOT IN',
|
|
'BETWEEN', 'NOT BETWEEN',
|
|
'EXISTS', 'NOT EXISTS',
|
|
'REGEXP', 'NOT REGEXP', 'RLIKE'
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|
) ) ) {
|
|
$clause['compare'] = '=';
|
|
}
|
|
|
|
$meta_compare = $clause['compare'];
|
|
|
|
// First build the JOIN clause, if one is required.
|
|
$join = '';
|
|
|
|
// We prefer to avoid joins if possible. Look for an existing join compatible with this clause.
|
|
$alias = $this->find_compatible_table_alias( $clause, $parent_query );
|
|
if ( false === $alias ) {
|
|
$i = count( $this->table_aliases );
|
|
$alias = $i ? 'mt' . $i : $this->meta_table;
|
|
|
|
// JOIN clauses for NOT EXISTS have their own syntax.
|
|
if ( 'NOT EXISTS' === $meta_compare ) {
|
|
$join .= " LEFT JOIN $this->meta_table";
|
|
$join .= $i ? " AS $alias" : '';
|
|
$join .= $wpdb->prepare( " ON ($this->primary_table.$this->primary_id_column = $alias.$this->meta_id_column AND $alias.meta_key = %s )", $clause['key'] );
|
|
|
|
// All other JOIN clauses.
|
|
} else {
|
|
$join .= " INNER JOIN $this->meta_table";
|
|
$join .= $i ? " AS $alias" : '';
|
|
$join .= " ON ( $this->primary_table.$this->primary_id_column = $alias.$this->meta_id_column )";
|
|
}
|
|
|
|
$this->table_aliases[] = $alias;
|
|
$sql_chunks['join'][] = $join;
|
|
}
|
|
|
|
// Save the alias to this clause, for future siblings to find.
|
|
$clause['alias'] = $alias;
|
|
|
|
// Determine the data type.
|
|
$_meta_type = isset( $clause['type'] ) ? $clause['type'] : '';
|
|
$meta_type = $this->get_cast_for_type( $_meta_type );
|
|
$clause['cast'] = $meta_type;
|
|
|
|
// Fallback for clause keys is the table alias. Key must be a string.
|
|
if ( is_int( $clause_key ) || ! $clause_key ) {
|
|
$clause_key = $clause['alias'];
|
|
}
|
|
|
|
// Ensure unique clause keys, so none are overwritten.
|
|
$iterator = 1;
|
|
$clause_key_base = $clause_key;
|
|
while ( isset( $this->clauses[ $clause_key ] ) ) {
|
|
$clause_key = $clause_key_base . '-' . $iterator;
|
|
$iterator++;
|
|
}
|
|
|
|
// Store the clause in our flat array.
|
|
$this->clauses[ $clause_key ] =& $clause;
|
|
|
|
// Next, build the WHERE clause.
|
|
|
|
// meta_key.
|
|
if ( array_key_exists( 'key', $clause ) ) {
|
|
if ( 'NOT EXISTS' === $meta_compare ) {
|
|
$sql_chunks['where'][] = $alias . '.' . $this->meta_id_column . ' IS NULL';
|
|
} else {
|
|
$sql_chunks['where'][] = $wpdb->prepare( "$alias.meta_key = %s", trim( $clause['key'] ) );
|
|
}
|
|
}
|
|
|
|
// meta_value.
|
|
if ( array_key_exists( 'value', $clause ) ) {
|
|
$meta_value = $clause['value'];
|
|
|
|
if ( in_array( $meta_compare, array( 'IN', 'NOT IN', 'BETWEEN', 'NOT BETWEEN' ) ) ) {
|
|
if ( ! is_array( $meta_value ) ) {
|
|
$meta_value = preg_split( '/[,\s]+/', $meta_value );
|
|
}
|
|
} else {
|
|
$meta_value = trim( $meta_value );
|
|
}
|
|
|
|
switch ( $meta_compare ) {
|
|
case 'IN' :
|
|
case 'NOT IN' :
|
|
$meta_compare_string = '(' . substr( str_repeat( ',%s', count( $meta_value ) ), 1 ) . ')';
|
|
$where = $wpdb->prepare( $meta_compare_string, $meta_value );
|
|
break;
|
|
|
|
case 'BETWEEN' :
|
|
case 'NOT BETWEEN' :
|
|
$meta_value = array_slice( $meta_value, 0, 2 );
|
|
$where = $wpdb->prepare( '%s AND %s', $meta_value );
|
|
break;
|
|
|
|
case 'LIKE' :
|
|
case 'NOT LIKE' :
|
|
$meta_value = '%' . $wpdb->esc_like( $meta_value ) . '%';
|
|
$where = $wpdb->prepare( '%s', $meta_value );
|
|
break;
|
|
|
|
// EXISTS with a value is interpreted as '='.
|
|
case 'EXISTS' :
|
|
$meta_compare = '=';
|
|
$where = $wpdb->prepare( '%s', $meta_value );
|
|
break;
|
|
|
|
// 'value' is ignored for NOT EXISTS.
|
|
case 'NOT EXISTS' :
|
|
$where = '';
|
|
break;
|
|
|
|
default :
|
|
$where = $wpdb->prepare( '%s', $meta_value );
|
|
break;
|
|
|
|
}
|
|
|
|
if ( $where ) {
|
|
$sql_chunks['where'][] = "CAST($alias.meta_value AS {$meta_type}) {$meta_compare} {$where}";
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Multiple WHERE clauses (for meta_key and meta_value) should
|
|
* be joined in parentheses.
|
|
*/
|
|
if ( 1 < count( $sql_chunks['where'] ) ) {
|
|
$sql_chunks['where'] = array( '( ' . implode( ' AND ', $sql_chunks['where'] ) . ' )' );
|
|
}
|
|
|
|
return $sql_chunks;
|
|
}
|
|
|
|
/**
|
|
* Get a flattened list of sanitized meta clauses.
|
|
*
|
|
* This array should be used for clause lookup, as when the table alias and CAST type must be determined for
|
|
* a value of 'orderby' corresponding to a meta clause.
|
|
*
|
|
* @since 4.2.0
|
|
* @access public
|
|
*
|
|
* @return array Meta clauses.
|
|
*/
|
|
public function get_clauses() {
|
|
return $this->clauses;
|
|
}
|
|
|
|
/**
|
|
* Identify an existing table alias that is compatible with the current
|
|
* query clause.
|
|
*
|
|
* We avoid unnecessary table joins by allowing each clause to look for
|
|
* an existing table alias that is compatible with the query that it
|
|
* needs to perform.
|
|
*
|
|
* An existing alias is compatible if (a) it is a sibling of `$clause`
|
|
* (ie, it's under the scope of the same relation), and (b) the combination
|
|
* of operator and relation between the clauses allows for a shared table join.
|
|
* In the case of WP_Meta_Query, this only applies to 'IN' clauses that are
|
|
* connected by the relation 'OR'.
|
|
*
|
|
* @since 4.1.0
|
|
* @access protected
|
|
*
|
|
* @param array $clause Query clause.
|
|
* @param array $parent_query Parent query of $clause.
|
|
* @return string|bool Table alias if found, otherwise false.
|
|
*/
|
|
protected function find_compatible_table_alias( $clause, $parent_query ) {
|
|
$alias = false;
|
|
|
|
foreach ( $parent_query as $sibling ) {
|
|
// If the sibling has no alias yet, there's nothing to check.
|
|
if ( empty( $sibling['alias'] ) ) {
|
|
continue;
|
|
}
|
|
|
|
// We're only interested in siblings that are first-order clauses.
|
|
if ( ! is_array( $sibling ) || ! $this->is_first_order_clause( $sibling ) ) {
|
|
continue;
|
|
}
|
|
|
|
$compatible_compares = array();
|
|
|
|
// Clauses connected by OR can share joins as long as they have "positive" operators.
|
|
if ( 'OR' === $parent_query['relation'] ) {
|
|
$compatible_compares = array( '=', 'IN', 'BETWEEN', 'LIKE', 'REGEXP', 'RLIKE', '>', '>=', '<', '<=' );
|
|
|
|
// Clauses joined by AND with "negative" operators share a join only if they also share a key.
|
|
} elseif ( isset( $sibling['key'] ) && isset( $clause['key'] ) && $sibling['key'] === $clause['key'] ) {
|
|
$compatible_compares = array( '!=', 'NOT IN', 'NOT LIKE' );
|
|
}
|
|
|
|
$clause_compare = strtoupper( $clause['compare'] );
|
|
$sibling_compare = strtoupper( $sibling['compare'] );
|
|
if ( in_array( $clause_compare, $compatible_compares ) && in_array( $sibling_compare, $compatible_compares ) ) {
|
|
$alias = $sibling['alias'];
|
|
break;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Filter the table alias identified as compatible with the current clause.
|
|
*
|
|
* @since 4.1.0
|
|
*
|
|
* @param string|bool $alias Table alias, or false if none was found.
|
|
* @param array $clause First-order query clause.
|
|
* @param array $parent_query Parent of $clause.
|
|
* @param object $this WP_Meta_Query object.
|
|
*/
|
|
return apply_filters( 'meta_query_find_compatible_table_alias', $alias, $clause, $parent_query, $this ) ;
|
|
}
|
|
|
|
/**
|
|
* Checks whether the current query has any OR relations.
|
|
*
|
|
* In some cases, the presence of an OR relation somewhere in the query will require
|
|
* the use of a `DISTINCT` or `GROUP BY` keyword in the `SELECT` clause. The current
|
|
* method can be used in these cases to determine whether such a clause is necessary.
|
|
*
|
|
* @since 4.3.0
|
|
*
|
|
* @return bool True if the query contains any `OR` relations, otherwise false.
|
|
*/
|
|
public function has_or_relation() {
|
|
return $this->has_or_relation;
|
|
}
|
|
}
|