創建一個包含靜態BIT值的MySQL視圖

Question

我試圖在MySQL 5.6.24中創建一個視圖，我需要一個BIT列。我創建視圖的表格沒有BIT列。然而

我create view聲明是這樣的，

create view my_view as select id, version, description, 
    b'1' as active from my_table; 

視圖中創建active場VARBINARY類型。

我也試過(1) as active它產生INT。 true as active也創建INT。

有沒有辦法在這樣的視圖中創建BIT列？

Answer 1

你不能，但你可以創建一個功能

CREATE FUNCTION cast_to_bit (N INT) RETURNS bit(1) 
BEGIN 
    RETURN N; 
END 


CREATE VIEW view_bit AS 
    SELECT 
     cast_to_bit(0), 
     cast_to_bit(1), 
     cast_to_bit(FALSE), 
     cast_to_bit(TRUE), 
     cast_to_bit(b'0'), 
     cast_to_bit(b'1'), 
     cast_to_bit(2=3), 
     cast_to_bit(2=2)