How to convert YES/NO to BIT automatically in SQL Server? - sql-server

Question

I want to override system defined conversion in SQL Server. is that possible.
Problem Statement
I have a large csv file to upload data in database. There is a column with BIT type contains True/False, Yes/No, 1/0
When I used bulk insertion True/False and '1/0' will be consider as right value but Yes/No (as expected) will throw an conversion error.
Is there any way to convert Yes/No without any looping or one by one value?
Edit
Custom data type PanelMemberType
CREATE TYPE [dbo].[PanelMemberType] AS TABLE(
[Email] [nvarchar](255) NOT NULL,
[LocationName] [nvarchar](255) NOT NULL,
[OptInPermission] [nvarchar](255) NOT NULL
)
GO
Stored procedure code:
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

Just apply a bit more logic rather than trying to blindly convert to bit:
p1.OptInPermission = convert( bit,
CASE p2.OptInPermission
WHEN 'Yes' THEN 1
WHEN 'No' THEN 0
ELSE p2.OptInPermission END)
(Or, to avoid having to duplicate this logic in both branches of the MERGE, do it in the source:
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
)

Answer 2

Inserts records from CSV file into staging table first.
Then run the actual insert into your table and your select statement should look like this:
INSERT INTO ActualTable(column1, column2, column3)
SELECT column1
, column2
, CAST(CASE column3
WHEN 'Yes' THEN 1
WHEN 'No' THEN 0
ELSE column3
END AS BIT) AS YourBitColumn
FROM StagingTable;
Based on your approach, this should be working:
ALTER PROCEDURE [dbo].[PanelMemberBulkUpdate]
(
#tblPanelMember PanelMemberType READONLY
, #PanelID INT
, #UserID NVARCHAR(128)
)
AS
BEGIN TRY
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, CASE p2.OptInPermission
WHEN 'Yes' THEN 1
WHEN 'No' THEN 0
ELSE p2.OptInPermission
END)
, p1.DateAdded = p1.DateAdded
, p1.DateLastUpdated = 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, CASE p2.OptInPermission
WHEN 'Yes' THEN 1
WHEN 'No' THEN 0
ELSE p2.OptInPermission
END)
, GETDATE()
);
END TRY
BEGIN CATCH
THROW;
END CATCH
You cannot override default function, but you can write your own one. for instance:
CREATE FUNCTION dbo.ConvertBit
(
#Input VARCHAR(5)
)
RETURNS TABLE AS RETURN
SELECT CONVERT(BIT, CASE #Input
WHEN 'True' THEN 1
WHEN 'Yes' THEN 1
WHEN '1' THEN 1
WHEN 'False' THEN 0
WHEN 'No' THEN 0
WHEN '0' THEN 0
END AS BitColumn;
And then just query it this way:
ALTER PROCEDURE [dbo].[PanelMemberBulkUpdate]
(
#tblPanelMember PanelMemberType READONLY
, #PanelID INT
, #UserID NVARCHAR(128)
)
AS
BEGIN TRY
SET NOCOUNT ON;
MERGE INTO PanelMember p1
USING (
SELECT T.Email
, T.LocationName
, B.OptInPermission
FROM #tblPanelMember AS T
CROSS APPLY dbo.ConvertBit(T.OptInPermission) AS B(OptInPermission)
) AS 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 = p2.OptInPermission
, p1.DateAdded = p1.DateAdded
, p1.DateLastUpdated = 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
, p2.OptInPermission
, GETDATE()
);
END TRY
BEGIN CATCH
THROW;
END CATCH