將SQL（LEFT OUTER JOIN）轉換爲LinQ

有人可以將下面的原始sql轉換爲linq嗎？將SQL（LEFT OUTER JOIN）轉換爲LinQ

_sql= " SELECT tbl_book.*, tbl_time.tt_scope, tbl_time.tt_time "+ 
     " FROM tbl_time "+ 
     " LEFT OUTER JOIN tbl_book ON tbl_time.tt_time = tbl_book.book_time "+ 
     " AND ([email protected]_id AND [email protected]_id "+ 
     " AND [email protected]_date)";

來源

2014-02-19 Taylern

只是一個提示：'LEFT OUTHER JOIN' ='LEFT JOIN' – guisantogui

參見[如何：執行左邊外部連接（C＃編程指南）]（http://msdn.microsoft.com/en-us/library/bb397895.aspx） – rsenna

[LINQ to SQL Left External Join]（http://stackoverflow.com/問題/ 700523/linq-to-sql-left-outer-join） – jnovo

如果

var ppt_id_param = "@ppt_id"; 
var fct_id_param = "@fct_id"; 
var book_date_param = "@book_date";

是我們的參數，可以和你的背景是這樣的：

TestEntities DBContext = new TestEntities();

您的LINQ查詢是這樣的：

var query = (from time in tbl_time 
      join book in tbl_book on time.tt_time equals book.book_time 
       into joinedList 
      from book in joinedList.DefaultIfEmpty() 
      where book == null ? 
       true : 
       (
         book.ppt_id == ppt_id_param && 
         book.fct_id == fct_id_param && 
         book.book_date == book_date_param && 
       ) 
      select new { 

       time.tt_scope, 
       time.tt_time 
       book 
      }) 
      .ToList();

來源

2014-02-20 15:11:26

謝謝。這就是我要的。 – Taylern

將SQL（LEFT OUTER JOIN）轉換爲LinQ

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