feat(tools/db): 在表结构描述中显示表注释

extend/base/common/command/tools/db/ToolsDbDescBase.php

@@ -54,6 +54,32 @@ class ToolsDbDescBase extends Command
             $output->writeln('<comment>' . str_repeat('=', 60) . '</comment>');
             $output->writeln('');
 
+            $tableComment = '';
+            try {
+                $escaped = addcslashes($fullTableName, "\\_%");
+                $rows = Db::connect($connection)->query("SHOW TABLE STATUS LIKE '$escaped'");
+                if (!empty($rows)) {
+                    $tableComment = (string)($rows[0]['Comment'] ?? '');
+                }
+            } catch (\Throwable $e) {
+            }
+
+            if ($tableComment === '') {
+                try {
+                    $rows = Db::connect($connection)->query("SHOW CREATE TABLE `$fullTableName`");
+                    if (!empty($rows)) {
+                        $create = $rows[0]['Create Table'] ?? '';
+                        if ($create !== '' && preg_match("/COMMENT='(.*?)'/s", $create, $matches)) {
+                            $tableComment = stripcslashes($matches[1]);
+                        }
+                    }
+                } catch (\Throwable $e) {
+                }
+            }
+
+            $output->writeln('<info>表注释：</info>' . $tableComment);
+            $output->writeln('');
+
             $columns = Db::connect($connection)->query("SHOW FULL COLUMNS FROM `$fullTableName`");
 
             if (empty($columns)) {