SQL Server 常用函数

1、首字母大写

SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO

create FUNCTION [dbo].[CAP_FIRST] ( @InputString varchar(4000) ) 
 RETURNS VARCHAR(4000) AS BEGIN

 DECLARE @Index          INT DECLARE @Char           CHAR(1) DECLARE
 @PrevChar       CHAR(1) DECLARE @OutputString   VARCHAR(255)

 SET @OutputString = LOWER(@InputString) SET @Index = 1

 WHILE @Index <= LEN(@InputString) BEGIN
     SET @Char     = SUBSTRING(@InputString, @Index, 1)
     SET @PrevChar = CASE WHEN @Index = 1 THEN ' '
                          ELSE SUBSTRING(@InputString, @Index - 1, 1)
                     END

     IF @PrevChar IN (' ', ';', ':', '!', '?', ',', '.', '_', '-', '/', '&', '''', '(')
     BEGIN
         IF @PrevChar != '''' OR UPPER(@Char) != 'S'
             SET @OutputString = STUFF(@OutputString, @Index, 1, UPPER(@Char))
     END

     SET @Index = @Index + 1 END

 RETURN @OutputString

 END
GO

*、CAP_FIRST调用

select dbo.CAP_FIRST('abcd_abcd')
select replace(dbo.CAP_FIRST('abcd_abcd'),'_','')

*、首字母大写

SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO

create function [dbo].[F_split](@s nvarchar(1000))
returns nvarchar(1000)
as
begin
declare @str nvarchar(1000),@split nvarchar(100)
select @[email protected]+' ',@str=''
while charindex(' ',@s)>0
begin
set @split=left(@s,charindex(' ',@s))
set @[email protected]+upper(left(@split,1))+right(@split,len(@split))
set @s=stuff(@s,1,charindex(char(32),@s),'')
end
return @str
end
GO

*、编码转换UrlEncode

SET ANSI_NULLS ON
GO
 
SET QUOTED_IDENTIFIER ON
GO
 
 
CREATE FUNCTION [dbo].[UrlEncode]
(
    @Param NVARCHAR(2000)
)
RETURNS VARCHAR(MAX)
AS
BEGIN
    DECLARE @HexStr VARCHAR(MAX)
    --Use system function to convert input string to hex string
    SET @HexStr = master.dbo.fn_varbintohexstr(CONVERT(VARBINARY(MAX), @Param))
    --Remove the starting '0x'
    SET @HexStr = RIGHT(@HexStr, LEN(@HexStr)-2)
    --Declare required variables
    DECLARE @I INT, @Len INT
    DECLARE @Output VARCHAR(MAX), @S CHAR(4), @C CHAR(1)
    DECLARE @LoByte TINYINT, @HiByte TINYINT
    --Get length
    SET @Len=LEN(@HexStr)/4
    --Start with first character
    SET @I=0
    --Prepare the output string
    SET @Output=''
    WHILE @I<@Len
        BEGIN
        SET @S=SUBSTRING(@HexStr, @I*4 + 1, 4)
        IF RIGHT(@S, 2)='00'
            BEGIN
            --Try to convert 2 hex digits to char
            SET @LoByte = ASCII(SUBSTRING(@S, 2, 1)) - 48
            IF @LoByte>10 SET @LoByte = @LoByte - 39 --0x61'a'-> 10
            SET @HiByte = ASCII(SUBSTRING(@S, 1, 1)) - 48
            IF @HiByte>10 SET @HiByte = @HiByte - 39
            SET @C=CHAR(@LoByte + @HiByte * 16)
            --If it's a reserved character, don't encode
            IF @C LIKE '[A-Za-z0-9()''*-._! ]'
                SET @Output = @Output + @C 
            ELSE
                SET @Output = @Output + '%' + LEFT(@S, 2)
            END
        ELSE
            SET @Output = @Output + '%u' + RIGHT(@S, 2) + LEFT(@S, 2)
        --Move to next hex 
        SET @I = @I + 1
        END
    
RETURN @Output
END
GO
 
--select dbo.FN_URLDecode('%E5%B9%BF%E4%B8%9C%E7%9C%81%E7%8F%A0%E6%B5%B7%E5%B8%82%E4%BF%A1%E6%81%AF%E5%B7%A5%E7%A8%8B%E6%9C%89%E9%99%90%E5%85%AC%E5%8F%B8')
GO

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