69 lines
1.8 KiB
PHP
69 lines
1.8 KiB
PHP
<?php
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namespace classes;
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/**
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* Ensures additive schema for customer product price overrides.
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*/
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class price_overrides_schema_bootstrap
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{
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private static bool $initialized = false;
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public static function ensureColumns(): void
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{
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if (self::$initialized) {
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return;
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}
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global $db;
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if (!isset($db) || !is_object($db) || !method_exists($db, 'query')) {
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return;
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}
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if (!self::tableExists($db, 'price_overrides')) {
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return;
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}
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if (!self::columnExists($db, 'price_overrides', 'fixed_price')) {
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$db->query(
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"ALTER TABLE price_overrides
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ADD COLUMN fixed_price INT NULL DEFAULT NULL
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AFTER percentage"
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);
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}
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self::$initialized = true;
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}
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private static function tableExists(object $db, string $table): bool
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{
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$table = self::escapeIdentifier($table);
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$result = $db->query("SHOW TABLES LIKE '{$table}'");
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if ($result === false || !is_object($result) || !property_exists($result, 'num_rows')) {
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return false;
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}
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return (int)$result->num_rows > 0;
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}
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private static function columnExists(object $db, string $table, string $column): bool
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{
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$table = self::escapeIdentifier($table);
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$column = self::escapeIdentifier($column);
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$result = $db->query("SHOW COLUMNS FROM `{$table}` LIKE '{$column}'");
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if ($result === false || !is_object($result) || !property_exists($result, 'num_rows')) {
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return false;
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}
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return (int)$result->num_rows > 0;
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}
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private static function escapeIdentifier(string $value): string
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{
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return str_replace(['\\', "'", '`'], ['\\\\', "\\'", ''], $value);
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}
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}
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