修正bug

[boolw]

nwidart\db-exporter\src\Nwidart\DbExporter\DbExporter.php
文件：37行
'information_schema.columns' 修正为 DB::raw('information_schema.columns')

原因：DB::table('information_schema.columns') 会自动加上前缀，导致报错
例：SQLSTATE[42S02]: Base table or view not found: 1146 Table 'bool_bool_inform
ation_schema.columns' doesn't exist (SQL: select column_name as Field,
column_type as Type, is_nullable as Null, column_key as Key, c olumn_default as Default, extra as Extra, data_type as Data_Type
from bool_bool_information_schema.columns where table_schema = bool_
cms and table_name = bool_admins)

[boolw]

还有类似的：
50行：DB::table($table) 修正为 DB::table(DB::raw($table))

[runbing]

@boolw Thx! 刚好遇到自定义前缀问题。

更新：发现如果这样修改后，再使用 php artisan migrate 命令，会再增加一个前缀。比如：blog_blog_users。