SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax;check..

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laravel 报错，这个报错很长，如下：

SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'concat(path,id) as paths from `web_node` order by `paths` asc' at line 1 (SQL: select ,concat(path,id) as paths from `web_node` order by `paths` asc)

乍一看其实没什么问题，但是我一看代码之后就恍然大悟，原来是我没写要查询的字段，代码如下：

// 结点表数据
$node = Node::select(DB::raw(',concat(path,id) as paths'))->orderBy('paths')->get()->toArray();

看出什么问题了吧，没加要查的字段，加上吧：

// 结点表数据
$node = Node::select(DB::raw('*,concat(path,id) as paths'))->orderBy('paths')->get()->toArray();

这个问题其实不该出现，但是代码调试的时候难免出现这种情况，所以...习以为常！