Comment puis-je faire AND BIT OPERATOR entre deux champs varbinary en SQL

Après une longue discussion, j'ai enfin compris quelles données d'entrée vous avez. Vous avez un varbinary(128) qui est construit à partir d'une chaîne binaire (comme '1000010010101... ') de 1024 caractères. SQL Server ne fournit pas de fonction prête qui effectue une telle conversion. J'en ai construit un pour me permettre de tester. La fonction suivante effectue une telle conversion :

CREATE FUNCTION dbo.binStringToBinary(@inputString VARCHAR(1024)) RETURNS VARBINARY(128) AS
BEGIN
    DECLARE @inputBinary VARBINARY(128) = convert(varbinary, '', 2)
    DECLARE @octet int = 1
    DECLARE @len int
    SET @len = Len(@inputString)
    while @octet < @len
    BEGIN
        DECLARE @i int = 0
        DECLARE @Output int = 0
        WHILE(@i < 7) BEGIN
            SET @Output = @Output + POWER(CAST(SUBSTRING(@inputString, @octet + @i, 1) AS int) * 2, 7 - @i)
            SET @i = @i + 1
        END
        SET @Output = @Output + CAST(SUBSTRING(@inputString, @octet + @i, 1) AS int)
        select @inputBinary = @inputBinary + convert(varbinary(1), @Output)
        -- PRINT substring(@inputString, @octet, 8) + ' ' + STR(@Output, 3, 0) + ' ' + convert(varchar(1024), @inputBinary, 2)
        SET @octet = @octet + 8
    END
    RETURN @inputBinary
END

J'ai ensuite écrit une fonction qui vérifie un peu en utilisant le varbinary(128) comme entrée :

CREATE FUNCTION dbo.[DoBitsMatchFromBinary](@bitToCheck INT,@inputBinary VARBINARY(1024))
RETURNS BIT
AS
BEGIN
    IF @bitToCheck < 1 OR @bitToCheck > 1024
        RETURN 0

    DECLARE @byte int = (@bitToCheck - 1) / 8
    DECLARE @bit int = @bitToCheck - @byte * 8
    DECLARE @bytemask int = POWER(2, [email protected])
    SET @byte = @byte + 1

    RETURN CASE WHEN CONVERT(int, CONVERT(binary(1), SUBSTRING(@inputBinary, @byte, 1), 2)) & @bytemask = @bytemask THEN 1 ELSE 0 END
END

En bonus, j'ai également inclus ici une fonction qui vérifie les bits à partir d'une chaîne binaire d'entrée (1024) :

CREATE FUNCTION dbo.[DoBitsMatchFromBinString](@bitToCheck INT,@inputString VARCHAR(1024))
RETURNS BIT
AS
BEGIN
    IF @bitToCheck < 1 OR @bitToCheck > 1024
        RETURN 0

    RETURN CASE WHEN SUBSTRING(@inputString, @bitToCheck, 1) = '1' THEN 1 ELSE 0 END
END

Vérifiez le violon SQL qui démontre leur utilisation.

DECLARE @inputBinary VARBINARY(128)
select @inputBinary = dbo.binStringToBinary('1010001000101111010111010100001101000100010111101011101010000101101000100010111101011101010000110100010001011110101110101000010110100010001011110101110101000011010001000101111010111010100001011010001000101111010111010100001101000100010111101011101010000101101000100010111101011101010000110100010001011110101110101000010110100010001011110101110101000011010001000101111010111010100001011010001000101111010111010100001101000100010111101011101010000101101000100010111101011101010000110100010001011110101110101000010110100010001011110101110101000011010001000101111010111010100001011010001000101111010111010100001101000100010111101011101010000101101000100010111101011101010000110100010001011110101110101000010110100010001011110101110101000011010001000101111010111010100001011010001000101111010111010100001101000100010111101011101010000101101000100010111101011101010000110100010001011110101110101000010110100010001011110101110101000011010001000101111010111010100001011010001000101111010111010100001101000100010111101011101010000101')
select dbo.[DoBitsMatchFromBinary](1, @inputBinary) bit1,
       dbo.[DoBitsMatchFromBinary](2, @inputBinary) bit2,
       dbo.[DoBitsMatchFromBinary](3, @inputBinary) bit3,
       dbo.[DoBitsMatchFromBinary](4, @inputBinary) bit4,
       dbo.[DoBitsMatchFromBinary](5, @inputBinary) bit5,
       dbo.[DoBitsMatchFromBinary](6, @inputBinary) bit6,
       dbo.[DoBitsMatchFromBinary](7, @inputBinary) bit7,
       dbo.[DoBitsMatchFromBinary](8, @inputBinary) bit8,
       dbo.[DoBitsMatchFromBinary](1017, @inputBinary) bit1017,
       dbo.[DoBitsMatchFromBinary](1018, @inputBinary) bit1018,
       dbo.[DoBitsMatchFromBinary](1019, @inputBinary) bit1019,
       dbo.[DoBitsMatchFromBinary](1020, @inputBinary) bit1020,
       dbo.[DoBitsMatchFromBinary](1021, @inputBinary) bit1021,
       dbo.[DoBitsMatchFromBinary](1022, @inputBinary) bit1022,
       dbo.[DoBitsMatchFromBinary](1023, @inputBinary) bit1023,
       dbo.[DoBitsMatchFromBinary](1024, @inputBinary) bit1024


| bit1 |  bit2 | bit3 |  bit4 |  bit5 |  bit6 | bit7 |  bit8 | bit1017 | bit1018 | bit1019 | bit1020 | bit1021 | bit1022 | bit1023 | bit1024 |
|------|-------|------|-------|-------|-------|------|-------|---------|---------|---------|---------|---------|---------|---------|---------|
| true | false | true | false | false | false | true | false |    true |   false |   false |   false |   false |    true |   false |    true |