sql-server - 如何在SQL Server 中自动将YES/NO 转换为BIT？

Question

我想覆盖 SQL Server 中系统定义的转换。这可能吗？

问题陈述

我有一个很大的 csv 文件来上传数据库中的数据。有一列 BIT 类型包含 True/False, Yes/No, 1/0

当我使用批量插入 True/False 时，'1/0' 将被视为正确值，但 Yes/No(如预期)将引发转换错误.

有没有什么方法可以在没有任何循环或一个值一个值的情况下转换是/否？

编辑

自定义数据类型PanelMemberType

CREATE TYPE [dbo].[PanelMemberType] AS TABLE(
 [Email] [nvarchar](255) NOT NULL,
 [LocationName] [nvarchar](255) NOT NULL,
 [OptInPermission] [nvarchar](255) NOT NULL
)
GO

存储过程代码:

ALTER PROCEDURE [dbo].[PanelMemberBulkUpdate]
     @tblPanelMember PanelMemberType READONLY, 
     @PanelID int, 
     @UserID nvarchar(128)
AS
BEGIN
     SET NOCOUNT ON;

     MERGE INTO PanelMember p1
     USING @tblPanelMember p2 ON p1.Email= p2.Email

     WHEN MATCHED THEN
         UPDATE SET  
             p1.PanelID = @PanelID,
             p1.LocationID = (SELECT TOP(1) [LocationID] 
                              FROM [dbo].[Location] 
                              WHERE [LocationName] = p2.LocationName),
             p1.Email = p2.Email,
             p1.OptInPermission = CONVERT(BIT, p2.OptInPermission),
             p1.DateAdded = p1.DateAdded, 
             p1.DateLastUpdated = (SELECT GETDATE()),
             p1.LastUpdateUserID = @UserID

     WHEN NOT MATCHED THEN
          INSERT (PanelID, LocationID, Email, OptInPermission, DateAdded) 
          VALUES (@PanelID, (SELECT TOP(1) [LocationID] 
                             FROM [dbo].[Location] 
                             WHERE [LocationName] = p2.LocationName), 
                  p2.Email, CONVERT(BIT, p2.OptInPermission),
                  (SELECT GETDATE()));
END

Answer 1

只需多应用一点逻辑，而不是尝试盲目地转换为 bit:

p1.OptInPermission = convert( bit,
      CASE p2.OptInPermission
        WHEN 'Yes' THEN 1
        WHEN 'No' THEN 0
        ELSE p2.OptInPermission END)

(或者，为了避免在 MERGE 的两个分支中重复此逻辑，请在源代码中执行此操作:

USING (select Email,LocationName,convert( bit,
          CASE p2.OptInPermission
            WHEN 'Yes' THEN 1
            WHEN 'No' THEN 0
            ELSE p2.OptInPermission END as OptInPermission from @tblPanelMember) p2

)