Question

我使用MS SQL Server 2008：我将'0x98120000'转换为字符串'00011001010010000000000000000000'。如何转换逆转。

请帮帮我。感谢。

Answer 1

 declare @t binary(4)
     set @t = 0x98120000 

    -- Out string : '00011001010010000000000000000000'
    Select  REVERSE(REPLICATE('0',8-DATALENGTH(dbo.DecimalToBinary(CONVERT(tinyint,0xFF) & SUBSTRING(@t,1,1))))+dbo.DecimalToBinary(CONVERT(tinyint,0xFF) & SUBSTRING(@t,1,1)))+''+
            REVERSE(REPLICATE('0',8-DATALENGTH(dbo.DecimalToBinary(CONVERT(tinyint,0xFF) & SUBSTRING(@t,2,1))))+dbo.DecimalToBinary(CONVERT(tinyint,0xFF) & SUBSTRING(@t,2,1)))+''+
            REVERSE(REPLICATE('0',8-DATALENGTH(dbo.DecimalToBinary(CONVERT(tinyint,0xFF) & SUBSTRING(@t,3,1))))+dbo.DecimalToBinary(CONVERT(tinyint,0xFF) & SUBSTRING(@t,3,1)))+''+
            REVERSE(REPLICATE('0',8-DATALENGTH(dbo.DecimalToBinary(CONVERT(tinyint,0xFF) & SUBSTRING(@t,4,1))))+dbo.DecimalToBinary(CONVERT(tinyint,0xFF) & SUBSTRING(@t,4,1))) As [String]

    --Out String binary : 0x98120000
    Declare @String varchar(200)
    Set @String='00011001010010000000000000000000'
    Select  Cast([dbo].[BinaryToDecimal](REVERSE(SUBSTRING(@String,1,8))) as binary(1))+
            Cast([dbo].[BinaryToDecimal](REVERSE(SUBSTRING(@String,9,8))) as binary(1))+
            Cast([dbo].[BinaryToDecimal](REVERSE(SUBSTRING(@String,17,8))) as binary(1))+
            Cast([dbo].[BinaryToDecimal](REVERSE(SUBSTRING(@String,25,8))) as binary(1)) as [ChangeBinary]

*** FUNCTION [dbo]。[DecimalToBinary] ****

CREATE FUNCTION [dbo].[DecimalToBinary]
(
    @Input bigint 
)
RETURNS varchar(5000)
AS
BEGIN
    DECLARE @Output varchar(5000) = ''
    WHILE @Input > 0 
    BEGIN
        SET @Output = @Output + CAST((@Input % 2) AS varchar)
        SET @Input = @Input / 2
    END
    RETURN REVERSE(@Output)
END

***** FUNCTION [dbo]。[BinaryToDecimal] *****

CREATE FUNCTION [dbo].[BinaryToDecimal]
(
 @Input varchar(255)
)
RETURNS bigint
AS
BEGIN
 DECLARE @Cnt tinyint = 1
 DECLARE @Len tinyint = LEN(@Input)
 DECLARE @Output bigint = CAST(SUBSTRING(@Input, @Len, 1) AS bigint)
 WHILE(@Cnt < @Len) 
 BEGIN
  SET @Output = @Output + POWER(CAST(SUBSTRING(@Input, @Len - @Cnt, 1) * 2 AS bigint), @Cnt)
  SET @Cnt = @Cnt + 1
 END
 RETURN @Output 
 END

如何转换字符串＆＃39; 00011001010010000000000000000000＆＃39;到＆＃39; 0x98120000＆＃39;？

1 个答案: