MSSQL Chinese character processing (character set encoding and sorting rules)

MSSQL Chinese character processing (character set encoding and sorting rules)
SQL Server Chinese processing involves character set coding and sorting rules, which is a very tangled problem.

SQL code

--ascii characters
Select N,x=cast (n as binary (2)), U=nchar (n) from Nums where n between and 126
--unicode Chinese Characters
Select N,x=cast (n as binary (2)), U=nchar (n) from Nums where n between 19968 and 40869
19968 0x4e00 A
40869 0x9fa5
--The following two conditions are used to determine whether a string contains Chinese characters
Like n '%[-]% ' collate chinese_prc_ci_as
Like N '%[a-]% ' collate chinese_prc_bin
This is because the order of Chinese characters is different in the above two kinds of sorting rules.
--Chinese full angle punctuation mark
Select N,x=cast (n as binary (2)), Uq=nchar (n), Ub=nchar (n-65248) from Nums where n between 65281 and 65374
Select NCHAR (12288), nchar (32)
65281 0xff01!!
65374 0xff5e ~ ~
--The following conditions are used to determine whether a string contains full-width punctuation
Like N '%[! -~]% ' Collate Chinese_prc_bin

Conversion of full-angle half-width punctuation:

SQL code
--full2half
Create function [dbo]. [Full2half] (
@string nvarchar (max)
)
Returns nvarchar (max)
As
/*
Full Angle (Fullwidth) converted to half angle (Halfwidth)
*/
Begin
DECLARE @chr nchar (1)
DECLARE @i int
Set @string = replace (@string, n ', n ')
Set @i = Patindex (n '%[! -~]% ' collate Latin1_General_BIN, @string)
While @i > 0
Begin
Set @chr = substring (@string, @i,1)
Set @string = replace (@string, @chr, nchar (Unicode (@chr)-65248)
Set @i = Patindex (n '%[! -~]% ' collate Latin1_General_BIN, @string)
End
return @string
End
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Create function [dbo]. [Half2full] (
@string nvarchar (max)
)
Returns nvarchar (max)
As
/*
Half Angle (Halfwidth) converted to full angle (Fullwidth)
*/
Begin
DECLARE @chr nchar (1)
DECLARE @i int
Set @string = replace (@string, n ', n ')
Set @i = Patindex (n '%[!-~]% ' collate Latin1_General_BIN, @string)
While @i > 0
Begin
Set @chr = substring (@string, @i,1)
Set @string = replace (@string, @chr, nchar (Unicode (@chr) +65248))
Set @i = Patindex (n '%[!-~]% ' collate Latin1_General_BIN, @string)
End
return @string
End
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