WC_Query::get_main_search_query_sql() │ public static │ WC 1.0

Based on WP_Query::parse_search

Method of the class: WC_Query{}

No Hooks.

Return

null. Nothing (null).

Usage

$result = WC_Query::get_main_search_query_sql();

WC_Query::get_main_search_query_sql() code WC 9.5.1

woocommerce/includes/class-wc-query.php 
public static function get_main_search_query_sql() {
	global $wpdb;

	$args         = self::$product_query->query_vars;
	$search_terms = isset( $args['search_terms'] ) ? $args['search_terms'] : array();
	$sql          = array();

	foreach ( $search_terms as $term ) {
		// Terms prefixed with '-' should be excluded.
		$include = '-' !== substr( $term, 0, 1 );

		if ( $include ) {
			$like_op  = 'LIKE';
			$andor_op = 'OR';
		} else {
			$like_op  = 'NOT LIKE';
			$andor_op = 'AND';
			$term     = substr( $term, 1 );
		}

		$like = '%' . $wpdb->esc_like( $term ) . '%';
		// phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared
		$sql[] = $wpdb->prepare( "(($wpdb->posts.post_title $like_op %s) $andor_op ($wpdb->posts.post_excerpt $like_op %s) $andor_op ($wpdb->posts.post_content $like_op %s))", $like, $like, $like );
	}

	if ( ! empty( $sql ) && ! is_user_logged_in() ) {
		$sql[] = "($wpdb->posts.post_password = '')";
	}

	return implode( ' AND ', $sql );
}