QL fragment to append to the main JOIN clause. * @type string $where SQL fragment to append to the main WHERE clause. * } */ protected function get_sql_clauses() { /* * $queries are passed by reference to get_sql_for_query() for recursion. * To keep $this->queries unaltered, pass a copy. */ $queries = $this->queries; $sql = $this->get_sql_for_query( $queries ); if ( ! empty( $sql['where'] ) ) { $sql['where'] = ' AND ' . $sql['where']; } return $sql; } /** * Generates SQL clauses for a single query array. * * If nested subqueries are found, this method recurses the tree to * produce the properly nested SQL. * * @since 4.1.0 * * @param array $query Query to parse (passed by reference). * @param int $depth Optional. Number of tree levels deep we currently are. * Used to calculate indentation. Default 0. * @return string[] { * Array containing JOIN and WHERE SQL clauses to append to a single query array. * * @type string $join SQL fragment to append to the main JOIN clause. * @type string $where SQL fragment to append to the main WHERE clause. * } */ protected function get_sql_for_query( &$query, $depth = 0 ) { $sql_chunks = array( 'join' => array(), 'where' => array(), ); $sql = array( 'join' => '', 'where' => '', ); $indent = ''; for ( $i = 0; $i < $depth; $i++ ) { $indent .= ' '; } foreach ( $query as $key => &$clause ) { if ( 'relation' === $key ) { $relation = $query['relation']; } elseif ( is_array( $clause ) ) { // This is a first-order clause. if ( $this->is_first_order_clause( $clause ) ) { $clause_sql = $this->get_sql_for_clause( $clause, $query ); $where_count = count( $clause_sql['where'] ); if ( ! $where_count ) { $sql_chunks['where'][] = ''; } elseif ( 1 === $where_count ) { $sql_chunks['where'][] = $clause_sql['where'][0]; } else { $sql_chunks['where'][] = '( ' . implode( ' AND ', $clause_sql['where'] ) . ' )'; } $sql_chunks['join'] = array_merge( $sql_chunks['join'], $clause_sql['join'] ); // This is a subquery, so we recurse. } else { $clause_sql = $this->get_sql_for_query( $clause, $depth + 1 ); $sql_chunks['where'][] = $clause_sql['where']; $sql_chunks['join'][] = $clause_sql['join']; } } } // Filter to remove empties. $sql_chunks['join'] = array_filter( $sql_chunks['join'] ); $sql_chunks['where'] = array_filter( $sql_chunks['where'] ); if ( empty( $relation ) ) { $relation = 'AND'; } // Filter duplicate JOIN clauses and combine into a single string. if ( ! empty( $sql_chunks['join'] ) ) { $sql['join'] = implode( ' ', array_unique( $sql_chunks['join'] ) ); } // Generate a single WHERE clause with proper brackets and indentation. if ( ! empty( $sql_chunks['where'] ) ) { $sql['where'] = '( ' . "\n " . $indent . implode( ' ' . "\n " . $indent . $relation . ' ' . "\n " . $indent, $sql_chunks['where'] ) . "\n" . $indent . ')'; } return $sql; } /** * Generates SQL JOIN and WHERE clauses for a "first-order" query clause. * * @since 4.1.0 * * @global wpdb $wpdb The WordPress database abstraction object. * * @param array $clause Query clause (passed by reference). * @param array $parent_query Parent query array. * @return array { * Array containing JOIN and WHERE SQL clauses to append to a first-order query. * * @type string[] $join Array of SQL fragments to append to the main JOIN clause. * @type string[] $where Array of SQL fragments to append to the main WHERE clause. * } */ public function get_sql_for_clause( &$clause, $parent_query ) { global $wpdb; $sql = array( 'where' => array(), 'join' => array(), ); $join = ''; $where = ''; $this->clean_query( $clause ); if ( is_wp_error( $clause ) ) { return self::$no_results; } $terms = $clause['terms']; $operator = strtoupper( $clause['operator'] ); if ( 'IN' === $operator ) { if ( empty( $terms ) ) { return self::$no_results; } $terms = implode( ',', $terms ); /* * Before creating another table join, see if this clause has a * sibling with an existing join that can be shared. */ $alias = $this->find_compatible_table_alias( $clause, $parent_query ); if ( false === $alias ) { $i = count( $this->table_aliases ); $alias = $i ? 'tt' . $i : $wpdb->term_relationships; // Store the alias as part of a flat array to build future iterators. $this->table_aliases[] = $alias; // Store the alias with this clause, so later siblings can use it. $clause['alias'] = $alias; $join .= " LEFT JOIN $wpdb->term_relationships"; $join .= $i ? " AS $alias" : ''; $join .= " ON ($this->primary_table.$this->primary_id_column = $alias.object_id)"; } $where = "$alias.term_taxonomy_id $operator ($terms)"; } elseif ( 'NOT IN' === $operator ) { if ( empty( $terms ) ) { return $sql; } $terms = implode( ',', $terms ); $where = "$this->primary_table.$this->primary_id_column NOT IN ( SELECT object_id FROM $wpdb->term_relationships WHERE term_taxonomy_id IN ($terms) )"; } elseif ( 'AND' === $operator ) { if ( empty( $terms ) ) { return $sql; } $num_terms = count( $terms ); $terms = implode( ',', $terms ); $where = "( SELECT COUNT(1) FROM $wpdb->term_relationships WHERE term_taxonomy_id IN ($terms) AND object_id = $this->primary_table.$this->primary_id_column ) = $num_terms"; } elseif ( 'NOT EXISTS' === $operator || 'EXISTS' === $operator ) { $where = $wpdb->prepare( "$operator ( SELECT 1 FROM $wpdb->term_relationships INNER JOIN $wpdb->term_taxonomy ON $wpdb->term_taxonomy.term_taxonomy_id = $wpdb->term_relationships.term_taxonomy_id WHERE $wpdb->term_taxonomy.taxonomy = %s AND $wpdb->term_relationships.object_id = $this->primary_table.$this->primary_id_column )", $clause['taxonomy'] ); } $sql['join'][] = $join; $sql['where'][] = $where; return $sql; } /** * Identifies an existing table alias that is compatible with the current query clause. * * We avoid unnecessary table joins by allowing each clause to look for * an existing table alias that is compatible with the query that it * needs to perform. * * An existing alias is compatible if (a) it is a sibling of `$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_Tax_Query, this only applies to 'IN' * clauses that are connected by the relation 'OR'. * * @since 4.1.0 * * @param array $clause Query clause. * @param array $parent_query Parent query of $clause. * @return string|false Table alias if found, otherwise false. */ protected function find_compatible_table_alias( $clause, $parent_query ) { $alias = false; // Confidence check. Only IN queries use the JOIN syntax. if ( ! isset( $clause['operator'] ) || 'IN' !== $clause['operator'] ) { return $alias; } // Since we're only checking IN queries, we're only concerned with OR relations. if ( ! isset( $parent_query['relation'] ) || 'OR' !== $parent_query['relation'] ) { return $alias; } $compatible_operators = array( 'IN' ); foreach ( $parent_query as $sibling ) { if ( ! is_array( $sibling ) || ! $this->is_first_order_clause( $sibling ) ) { continue; } if ( empty( $sibling['alias'] ) || empty( $sibling['operator'] ) ) { continue; } // The sibling must both have compatible operator to share its alias. if ( in_array( strtoupper( $sibling['operator'] ), $compatible_operators, true ) ) { $alias = preg_replace( '/\W/', '_', $sibling['alias'] ); break; } } return $alias; } /** * Validates a single query. * * @since 3.2.0 * * @param array $query The single query. Passed by reference. */ private function clean_query( &$query ) { if ( empty( $query['taxonomy'] ) ) { if ( 'term_taxonomy_id' !== $query['field'] ) { $query = new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy.' ) ); return; } // So long as there are shared terms, 'include_children' requires that a taxonomy is set. $query['include_children'] = false; } elseif ( ! taxonomy_exists( $query['taxonomy'] ) ) { $query = new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy.' ) ); return; } if ( 'slug' === $query['field'] || 'name' === $query['field'] ) { $query['terms'] = array_unique( (array) $query['terms'] ); } else { $query['terms'] = wp_parse_id_list( $query['terms'] ); } if ( is_taxonomy_hierarchical( $query['taxonomy'] ) && $query['include_children'] ) { $this->transform_query( $query, 'term_id' ); if ( is_wp_error( $query ) ) { return; } $children = array(); foreach ( $query['terms'] as $term ) { $children = array_merge( $children, get_term_children( $term, $query['taxonomy'] ) ); $children[] = $term; } $query['terms'] = $children; } $this->transform_query( $query, 'term_taxonomy_id' ); } /** * Transforms a single query, from one field to another. * * Operates on the `$query` object by reference. In the case of error, * `$query` is converted to a WP_Error object. * * @since 3.2.0 * * @param array $query The single query. Passed by reference. * @param string $resulting_field The resulting field. Accepts 'slug', 'name', 'term_taxonomy_id', * or 'term_id'. Default 'term_id'. */ public function transform_query( &$query, $resulting_field ) { if ( empty( $query['terms'] ) ) { return; } if ( $query['field'] === $resulting_field ) { return; } $resulting_field = sanitize_key( $resulting_field ); // Empty 'terms' always results in a null transformation. $terms = array_filter( $query['terms'] ); if ( empty( $terms ) ) { $query['terms'] = array(); $query['field'] = $resulting_field; return; } $args = array( 'get' => 'all', 'number' => 0, 'taxonomy' => $query['taxonomy'], 'update_term_meta_cache' => false, 'orderby' => 'none', ); // Term query parameter name depends on the 'field' being searched on. switch ( $query['field'] ) { case 'slug': $args['slug'] = $terms; break; case 'name': $args['name'] = $terms; break; case 'term_taxonomy_id': $args['term_taxonomy_id'] = $terms; break; default: $args['include'] = wp_parse_id_list( $terms ); break; } if ( ! is_taxonomy_hierarchical( $query['taxonomy'] ) ) { $args['number'] = count( $terms ); } $term_query = new WP_Term_Query(); $term_list = $term_query->query( $args ); if ( is_wp_error( $term_list ) ) { $query = $term_list; return; } if ( 'AND' === $query['operator'] && count( $term_list ) < count( $query['terms'] ) ) { $query = new WP_Error( 'inexistent_terms', __( 'Inexistent terms.' ) ); return; } $query['terms'] = wp_list_pluck( $term_list, $resulting_field ); $query['field'] = $resulting_field; } }
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