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<?php
/**
* Base Custom Database Table Compare Query Class.
*
* @package Database
* @subpackage Compare
* @copyright Copyright (c) 2021
* @license https://opensource.org/licenses/MIT MIT
* @since 1.0.0
*/
namespace WP_Rocket\Dependencies\Database\Queries;
// Exit if accessed directly
defined( 'ABSPATH' ) || exit;
/**
* Class used for generating SQL for compare clauses.
*
* This class is used to generate the SQL when a `compare` argument is passed to
* the `Base` query class. It extends `Meta` so the `compare` key accepts
* the same parameters as the ones passed to `Meta`.
*
* @since 1.0.0
*/
class Compare extends Meta {
// All supported SQL comparisons
const ALL_COMPARES = array(
'=',
'!=',
'>',
'>=',
'<',
'<=',
'LIKE',
'NOT LIKE',
'IN',
'NOT IN',
'BETWEEN',
'NOT BETWEEN',
'EXISTS',
'NOT EXISTS',
'REGEXP',
'NOT REGEXP',
'RLIKE',
);
// IN and BETWEEN
const IN_BETWEEN_COMPARES = array(
'IN',
'NOT IN',
'BETWEEN',
'NOT BETWEEN'
);
/**
* Generate SQL WHERE clauses for a first-order query clause.
*
* "First-order" means that it's an array with a 'key' or 'value'.
*
* @since 1.0.0
*
* @param array $clause Query clause (passed by reference).
* @param array $parent_query Parent query array.
* @param string $clause_key Optional. The array key used to name the clause in the original `$meta_query`
* parameters. If not provided, a key will be generated automatically.
* @return array {
* Array containing WHERE SQL clauses to append to a first-order query.
*
* @type string $where SQL fragment to append to the main WHERE clause.
* }
*/
public function get_sql_for_clause( &$clause, $parent_query, $clause_key = '' ) {
global $wpdb;
// Default chunks
$sql_chunks = array(
'where' => array(),
'join' => array(),
);
// Maybe format compare clause
if ( isset( $clause['compare'] ) ) {
$clause['compare'] = strtoupper( $clause['compare'] );
// Or set compare clause based on value
} else {
$clause['compare'] = isset( $clause['value'] ) && is_array( $clause['value'] )
? 'IN'
: '=';
}
// Fallback to equals
if ( ! in_array( $clause['compare'], self::ALL_COMPARES, true ) ) {
$clause['compare'] = '=';
}
// Uppercase or equals
if ( isset( $clause['compare_key'] ) && ( 'LIKE' === strtoupper( $clause['compare_key'] ) ) ) {
$clause['compare_key'] = strtoupper( $clause['compare_key'] );
} else {
$clause['compare_key'] = '=';
}
// Get comparison from clause
$compare = $clause['compare'];
/** Build the WHERE clause ********************************************/
// Column name and value.
if ( array_key_exists( 'key', $clause ) && array_key_exists( 'value', $clause ) ) {
$column = sanitize_key( $clause['key'] );
$value = $clause['value'];
// IN or BETWEEN
if ( in_array( $compare, self::IN_BETWEEN_COMPARES, true ) ) {
if ( ! is_array( $value ) ) {
$value = preg_split( '/[,\s]+/', $value );
}
// Anything else
} else {
$value = trim( $value );
}
// Format WHERE from compare value(s)
switch ( $compare ) {
case 'IN':
case 'NOT IN':
$compare_string = '(' . substr( str_repeat( ',%s', count( $value ) ), 1 ) . ')';
$where = $wpdb->prepare( $compare_string, $value );
break;
case 'BETWEEN':
case 'NOT BETWEEN':
$value = array_slice( $value, 0, 2 );
$where = $wpdb->prepare( '%s AND %s', $value );
break;
case 'LIKE':
case 'NOT LIKE':
$value = '%' . $wpdb->esc_like( $value ) . '%';
$where = $wpdb->prepare( '%s', $value );
break;
// EXISTS with a value is interpreted as '='.
case 'EXISTS':
$compare = '=';
$where = $wpdb->prepare( '%s', $value );
break;
// 'value' is ignored for NOT EXISTS.
case 'NOT EXISTS':
$where = '';
break;
default:
$where = $wpdb->prepare( '%s', $value );
break;
}
// Maybe add column, compare, & where to chunks
if ( ! empty( $where ) ) {
$sql_chunks['where'][] = "{$column} {$compare} {$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
return $sql_chunks;
}
}