Question

在我的表中，我将强制列作为字符串（例如：“ 20170502 ”）。
我想从该字符串中获取星期几，因此我尝试将其转换为日期格式，但无法正常工作。

$event = VEventMp::where('event_seq', '=', $mypage_data->event_seq)
    ->select(
        'ENFORCE_PLACE',
        'ENFORCE_FROM',
        \DB::raw("DATE_FORMAT(STR_TO_DATE(ENFORCE_FROM,'%y/%m/%d'), '%m月%d日') 
         AS day"),
        \DB::raw('(CASE WHEN WEEKDAY(day) = 0 THEN "月"
        WHEN WEEKDAY(start_time) = 1 THEN "火"
        WHEN WEEKDAY(start_time) = 2 THEN "水"
        WHEN WEEKDAY(start_time) = 3 THEN "木"
        WHEN WEEKDAY(start_time) = 4 THEN "金"
        WHEN WEEKDAY(start_time) = 5 THEN "土"
        WHEN WEEKDAY(start_time) = 6 THEN "日" END) AS weekday')
    ->first();

我在哪里弄错了？
谢谢！

Answer 1

您遇到了两个问题，首先，如果日期格式类似于20170502，那么您必须将其与STR_TO_DATE进行匹配，因此将其更改为：

STR_TO_DATE(ENFORCE_FROM,'%Y%m%d')

第二，您不能在查询的SELECT部分使用别名，因此您需要将CASE表达式更改为

(CASE WHEN WEEKDAY(STR_TO_DATE(ENFORCE_FROM,'%Y%m%d')) = 0 THEN "月"
      WHEN WEEKDAY(STR_TO_DATE(ENFORCE_FROM,'%Y%m%d')) = 1 THEN "火"
      WHEN WEEKDAY(STR_TO_DATE(ENFORCE_FROM,'%Y%m%d')) = 2 THEN "水"
      WHEN WEEKDAY(STR_TO_DATE(ENFORCE_FROM,'%Y%m%d')) = 3 THEN "木"
      WHEN WEEKDAY(STR_TO_DATE(ENFORCE_FROM,'%Y%m%d')) = 4 THEN "金"
      WHEN WEEKDAY(STR_TO_DATE(ENFORCE_FROM,'%Y%m%d')) = 5 THEN "土"
      WHEN WEEKDAY(STR_TO_DATE(ENFORCE_FROM,'%Y%m%d')) = 6 THEN "日" END) AS weekday

Laravel雄辩地从字符串获取日期格式

1 个答案: