891 lines
30 KiB
PHP
891 lines
30 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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*/
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#[AllowDynamicProperties]
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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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* @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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* @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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* @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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* @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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* @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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* @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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* @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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* @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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* @var bool
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*/
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protected $has_or_relation = false;
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/**
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* Constructor.
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*
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* @since 3.2.0
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* @since 4.2.0 Introduced support for naming query clauses by associative array keys.
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* @since 5.1.0 Introduced `$compare_key` clause parameter, which enables LIKE key matches.
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* @since 5.3.0 Increased the number of operators available to `$compare_key`. Introduced `$type_key`,
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* which enables the `$key` to be cast to a new data type for comparisons.
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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 or sub-clauses use strings as
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* their array keys, they may be 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 the clauses of the query.
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* Accepts 'AND' or 'OR'. Default 'AND'.
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* @type array ...$0 {
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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|string[] $key Meta key or keys to filter by.
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* @type string $compare_key MySQL operator used for comparing the $key. Accepts:
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* - '='
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* - '!='
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* - 'LIKE'
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* - 'NOT LIKE'
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* - 'IN'
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* - 'NOT IN'
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* - 'REGEXP'
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* - 'NOT REGEXP'
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* - 'RLIKE'
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* - 'EXISTS' (alias of '=')
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* - 'NOT EXISTS' (alias of '!=')
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* Default is 'IN' when `$key` is an array, '=' otherwise.
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* @type string $type_key MySQL data type that the meta_key column will be CAST to for
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* comparisons. Accepts 'BINARY' for case-sensitive regular expression
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* comparisons. Default is ''.
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* @type string|string[] $value Meta value or values to filter by.
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* @type string $compare MySQL operator used for comparing the $value. Accepts:
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* - '='
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* - '!='
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* - '>'
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* - '>='
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* - '<'
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* - '<='
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* - 'LIKE'
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* - 'NOT LIKE'
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* - 'IN'
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* - 'NOT IN'
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* - 'BETWEEN'
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* - 'NOT BETWEEN'
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* - 'REGEXP'
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* - 'NOT REGEXP'
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* - 'RLIKE'
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* - 'EXISTS'
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* - 'NOT EXISTS'
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* Default is 'IN' when `$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:
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* - 'NUMERIC'
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* - 'BINARY'
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* - 'CHAR'
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* - 'DATE'
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* - 'DATETIME'
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* - 'DECIMAL'
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* - 'SIGNED'
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* - 'TIME'
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* - '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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}
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if ( isset( $meta_query['relation'] ) && 'OR' === strtoupper( $meta_query['relation'] ) ) {
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$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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* Ensures 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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*
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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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* Determines 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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*
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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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*
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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', 'compare_key', 'type_key' ) 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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* Returns 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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*
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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( $type ) ) {
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return 'CHAR';
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}
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$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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}
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if ( 'NUMERIC' === $meta_type ) {
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$meta_type = 'SIGNED';
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}
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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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*
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* @param string $type Type of meta. Possible values include but are not limited
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* to 'post', 'comment', 'blog', 'term', and 'user'.
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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 that corresponds to the type, for
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* example a `WP_Query`, `WP_User_Query`, or `WP_Site_Query`.
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* Default null.
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* @return string[]|false {
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* Array containing JOIN and WHERE SQL clauses to append to the main query,
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* or false if no table exists for the requested meta type.
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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, $context = null ) {
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$meta_table = _get_meta_table( $type );
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if ( ! $meta_table ) {
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return false;
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}
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$this->table_aliases = array();
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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 ( str_contains( $sql['join'], 'LEFT JOIN' ) ) {
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$sql['join'] = str_replace( 'INNER JOIN', 'LEFT JOIN', $sql['join'] );
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}
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/**
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* Filters 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 string[] $sql 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. Possible values include but are not limited
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* to 'post', 'comment', 'blog', 'term', and 'user'.
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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 that corresponds to the type, for
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* example a `WP_Query`, `WP_User_Query`, or `WP_Site_Query`.
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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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* Generates 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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*
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* @return string[] {
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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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* Generates 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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*
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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 string[] {
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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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* Generates 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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*
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* @since 4.1.0
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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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* Default empty string.
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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 Array of SQL fragments to append to the main JOIN clause.
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* @type string[] $where Array of SQL fragments to append to the main WHERE clause.
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* }
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*/
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public function get_sql_for_clause( &$clause, $parent_query, $clause_key = '' ) {
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global $wpdb;
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$sql_chunks = array(
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'where' => array(),
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'join' => array(),
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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( $clause['value'] ) ? 'IN' : '=';
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}
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$non_numeric_operators = array(
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'=',
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'!=',
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'LIKE',
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'NOT LIKE',
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'IN',
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'NOT IN',
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'EXISTS',
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'NOT EXISTS',
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'RLIKE',
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'REGEXP',
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'NOT REGEXP',
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);
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$numeric_operators = array(
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'>',
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'>=',
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'<',
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'<=',
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'BETWEEN',
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'NOT BETWEEN',
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);
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if ( ! in_array( $clause['compare'], $non_numeric_operators, true ) && ! in_array( $clause['compare'], $numeric_operators, true ) ) {
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$clause['compare'] = '=';
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}
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if ( isset( $clause['compare_key'] ) ) {
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$clause['compare_key'] = strtoupper( $clause['compare_key'] );
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} else {
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$clause['compare_key'] = isset( $clause['key'] ) && is_array( $clause['key'] ) ? 'IN' : '=';
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}
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if ( ! in_array( $clause['compare_key'], $non_numeric_operators, true ) ) {
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$clause['compare_key'] = '=';
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}
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$meta_compare = $clause['compare'];
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$meta_compare_key = $clause['compare_key'];
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// First build the JOIN clause, if one is required.
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$join = '';
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// We prefer to avoid joins if possible. Look for an existing join compatible with this clause.
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$alias = $this->find_compatible_table_alias( $clause, $parent_query );
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if ( false === $alias ) {
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$i = count( $this->table_aliases );
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$alias = $i ? 'mt' . $i : $this->meta_table;
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// JOIN clauses for NOT EXISTS have their own syntax.
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if ( 'NOT EXISTS' === $meta_compare ) {
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$join .= " LEFT JOIN $this->meta_table";
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$join .= $i ? " AS $alias" : '';
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if ( 'LIKE' === $meta_compare_key ) {
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$join .= $wpdb->prepare( " ON ( $this->primary_table.$this->primary_id_column = $alias.$this->meta_id_column AND $alias.meta_key LIKE %s )", '%' . $wpdb->esc_like( $clause['key'] ) . '%' );
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} else {
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$join .= $wpdb->prepare( " ON ( $this->primary_table.$this->primary_id_column = $alias.$this->meta_id_column AND $alias.meta_key = %s )", $clause['key'] );
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}
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// All other JOIN clauses.
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} else {
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$join .= " INNER JOIN $this->meta_table";
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$join .= $i ? " AS $alias" : '';
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$join .= " ON ( $this->primary_table.$this->primary_id_column = $alias.$this->meta_id_column )";
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}
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$this->table_aliases[] = $alias;
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$sql_chunks['join'][] = $join;
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}
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// Save the alias to this clause, for future siblings to find.
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$clause['alias'] = $alias;
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// Determine the data type.
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$_meta_type = isset( $clause['type'] ) ? $clause['type'] : '';
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$meta_type = $this->get_cast_for_type( $_meta_type );
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$clause['cast'] = $meta_type;
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// Fallback for clause keys is the table alias. Key must be a string.
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if ( is_int( $clause_key ) || ! $clause_key ) {
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$clause_key = $clause['alias'];
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}
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// Ensure unique clause keys, so none are overwritten.
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$iterator = 1;
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$clause_key_base = $clause_key;
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while ( isset( $this->clauses[ $clause_key ] ) ) {
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$clause_key = $clause_key_base . '-' . $iterator;
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++$iterator;
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}
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// Store the clause in our flat array.
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$this->clauses[ $clause_key ] =& $clause;
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// Next, build the WHERE clause.
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// meta_key.
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if ( array_key_exists( 'key', $clause ) ) {
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if ( 'NOT EXISTS' === $meta_compare ) {
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$sql_chunks['where'][] = $alias . '.' . $this->meta_id_column . ' IS NULL';
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} else {
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/**
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* In joined clauses negative operators have to be nested into a
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* NOT EXISTS clause and flipped, to avoid returning records with
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* matching post IDs but different meta keys. Here we prepare the
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* nested clause.
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*/
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if ( in_array( $meta_compare_key, array( '!=', 'NOT IN', 'NOT LIKE', 'NOT EXISTS', 'NOT REGEXP' ), true ) ) {
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// Negative clauses may be reused.
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$i = count( $this->table_aliases );
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$subquery_alias = $i ? 'mt' . $i : $this->meta_table;
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$this->table_aliases[] = $subquery_alias;
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$meta_compare_string_start = 'NOT EXISTS (';
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$meta_compare_string_start .= "SELECT 1 FROM $wpdb->postmeta $subquery_alias ";
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$meta_compare_string_start .= "WHERE $subquery_alias.post_ID = $alias.post_ID ";
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$meta_compare_string_end = 'LIMIT 1';
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$meta_compare_string_end .= ')';
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}
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switch ( $meta_compare_key ) {
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case '=':
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case 'EXISTS':
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$where = $wpdb->prepare( "$alias.meta_key = %s", trim( $clause['key'] ) ); // phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared
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break;
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case 'LIKE':
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$meta_compare_value = '%' . $wpdb->esc_like( trim( $clause['key'] ) ) . '%';
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$where = $wpdb->prepare( "$alias.meta_key LIKE %s", $meta_compare_value ); // phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared
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break;
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case 'IN':
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$meta_compare_string = "$alias.meta_key IN (" . substr( str_repeat( ',%s', count( $clause['key'] ) ), 1 ) . ')';
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$where = $wpdb->prepare( $meta_compare_string, $clause['key'] ); // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared
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break;
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case 'RLIKE':
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case 'REGEXP':
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$operator = $meta_compare_key;
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if ( isset( $clause['type_key'] ) && 'BINARY' === strtoupper( $clause['type_key'] ) ) {
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$cast = 'BINARY';
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$meta_key = "CAST($alias.meta_key AS BINARY)";
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} else {
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$cast = '';
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$meta_key = "$alias.meta_key";
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}
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$where = $wpdb->prepare( "$meta_key $operator $cast %s", trim( $clause['key'] ) ); // phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared
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break;
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case '!=':
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case 'NOT EXISTS':
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$meta_compare_string = $meta_compare_string_start . "AND $subquery_alias.meta_key = %s " . $meta_compare_string_end;
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$where = $wpdb->prepare( $meta_compare_string, $clause['key'] ); // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared
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break;
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case 'NOT LIKE':
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$meta_compare_string = $meta_compare_string_start . "AND $subquery_alias.meta_key LIKE %s " . $meta_compare_string_end;
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$meta_compare_value = '%' . $wpdb->esc_like( trim( $clause['key'] ) ) . '%';
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$where = $wpdb->prepare( $meta_compare_string, $meta_compare_value ); // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared
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break;
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case 'NOT IN':
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$array_subclause = '(' . substr( str_repeat( ',%s', count( $clause['key'] ) ), 1 ) . ') ';
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$meta_compare_string = $meta_compare_string_start . "AND $subquery_alias.meta_key IN " . $array_subclause . $meta_compare_string_end;
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$where = $wpdb->prepare( $meta_compare_string, $clause['key'] ); // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared
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break;
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case 'NOT REGEXP':
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$operator = $meta_compare_key;
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if ( isset( $clause['type_key'] ) && 'BINARY' === strtoupper( $clause['type_key'] ) ) {
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$cast = 'BINARY';
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$meta_key = "CAST($subquery_alias.meta_key AS BINARY)";
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} else {
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$cast = '';
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$meta_key = "$subquery_alias.meta_key";
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}
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$meta_compare_string = $meta_compare_string_start . "AND $meta_key REGEXP $cast %s " . $meta_compare_string_end;
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$where = $wpdb->prepare( $meta_compare_string, $clause['key'] ); // phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared
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break;
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}
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$sql_chunks['where'][] = $where;
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}
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}
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// meta_value.
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if ( array_key_exists( 'value', $clause ) ) {
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$meta_value = $clause['value'];
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if ( in_array( $meta_compare, array( 'IN', 'NOT IN', 'BETWEEN', 'NOT BETWEEN' ), true ) ) {
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if ( ! is_array( $meta_value ) ) {
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$meta_value = preg_split( '/[,\s]+/', $meta_value );
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}
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} elseif ( is_string( $meta_value ) ) {
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$meta_value = trim( $meta_value );
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}
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switch ( $meta_compare ) {
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case 'IN':
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case 'NOT IN':
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$meta_compare_string = '(' . substr( str_repeat( ',%s', count( $meta_value ) ), 1 ) . ')';
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$where = $wpdb->prepare( $meta_compare_string, $meta_value );
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break;
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case 'BETWEEN':
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case 'NOT BETWEEN':
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$where = $wpdb->prepare( '%s AND %s', $meta_value[0], $meta_value[1] );
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break;
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case 'LIKE':
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case 'NOT LIKE':
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$meta_value = '%' . $wpdb->esc_like( $meta_value ) . '%';
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$where = $wpdb->prepare( '%s', $meta_value );
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break;
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// EXISTS with a value is interpreted as '='.
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case 'EXISTS':
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$meta_compare = '=';
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$where = $wpdb->prepare( '%s', $meta_value );
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break;
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// 'value' is ignored for NOT EXISTS.
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case 'NOT EXISTS':
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$where = '';
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break;
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default:
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$where = $wpdb->prepare( '%s', $meta_value );
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break;
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}
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if ( $where ) {
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if ( 'CHAR' === $meta_type ) {
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$sql_chunks['where'][] = "$alias.meta_value {$meta_compare} {$where}";
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} else {
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$sql_chunks['where'][] = "CAST($alias.meta_value AS {$meta_type}) {$meta_compare} {$where}";
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}
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}
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}
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/*
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* Multiple WHERE clauses (for meta_key and meta_value) should
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* be joined in parentheses.
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*/
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if ( 1 < count( $sql_chunks['where'] ) ) {
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$sql_chunks['where'] = array( '( ' . implode( ' AND ', $sql_chunks['where'] ) . ' )' );
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}
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return $sql_chunks;
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}
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/**
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* Gets a flattened list of sanitized meta clauses.
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*
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* This array should be used for clause lookup, as when the table alias and CAST type must be determined for
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* a value of 'orderby' corresponding to a meta clause.
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*
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* @since 4.2.0
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*
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* @return array Meta clauses.
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*/
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public function get_clauses() {
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return $this->clauses;
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}
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/**
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* Identifies an existing table alias that is compatible with the current
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* query clause.
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*
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* We avoid unnecessary table joins by allowing each clause to look for
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* an existing table alias that is compatible with the query that it
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* needs to perform.
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*
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* An existing alias is compatible if (a) it is a sibling of `$clause`
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* (ie, it's under the scope of the same relation), and (b) the combination
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* of operator and relation between the clauses allows for a shared table join.
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* In the case of WP_Meta_Query, this only applies to 'IN' clauses that are
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* connected by the relation 'OR'.
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*
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* @since 4.1.0
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*
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* @param array $clause Query clause.
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* @param array $parent_query Parent query of $clause.
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* @return string|false Table alias if found, otherwise false.
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*/
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protected function find_compatible_table_alias( $clause, $parent_query ) {
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$alias = false;
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foreach ( $parent_query as $sibling ) {
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// If the sibling has no alias yet, there's nothing to check.
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if ( empty( $sibling['alias'] ) ) {
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continue;
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}
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// We're only interested in siblings that are first-order clauses.
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if ( ! is_array( $sibling ) || ! $this->is_first_order_clause( $sibling ) ) {
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continue;
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}
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$compatible_compares = array();
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// Clauses connected by OR can share joins as long as they have "positive" operators.
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if ( 'OR' === $parent_query['relation'] ) {
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$compatible_compares = array( '=', 'IN', 'BETWEEN', 'LIKE', 'REGEXP', 'RLIKE', '>', '>=', '<', '<=' );
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// Clauses joined by AND with "negative" operators share a join only if they also share a key.
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} elseif ( isset( $sibling['key'] ) && isset( $clause['key'] ) && $sibling['key'] === $clause['key'] ) {
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$compatible_compares = array( '!=', 'NOT IN', 'NOT LIKE' );
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}
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$clause_compare = strtoupper( $clause['compare'] );
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$sibling_compare = strtoupper( $sibling['compare'] );
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if ( in_array( $clause_compare, $compatible_compares, true ) && in_array( $sibling_compare, $compatible_compares, true ) ) {
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$alias = preg_replace( '/\W/', '_', $sibling['alias'] );
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break;
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}
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}
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/**
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* Filters the table alias identified as compatible with the current clause.
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*
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* @since 4.1.0
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*
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* @param string|false $alias Table alias, or false if none was found.
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* @param array $clause First-order query clause.
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* @param array $parent_query Parent of $clause.
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* @param WP_Meta_Query $query WP_Meta_Query object.
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*/
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return apply_filters( 'meta_query_find_compatible_table_alias', $alias, $clause, $parent_query, $this );
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}
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/**
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* Checks whether the current query has any OR relations.
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*
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* In some cases, the presence of an OR relation somewhere in the query will require
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* the use of a `DISTINCT` or `GROUP BY` keyword in the `SELECT` clause. The current
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* method can be used in these cases to determine whether such a clause is necessary.
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*
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* @since 4.3.0
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*
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* @return bool True if the query contains any `OR` relations, otherwise false.
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*/
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public function has_or_relation() {
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return $this->has_or_relation;
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}
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}
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