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SQLServer转换全角和半角函数

lcc0556

1. 创建函数

CREATE FUNCTION Fn_Convert_Semiangle(
  @str nvarchar(4000), --要转换的字符串
  @flag bit            --转换标志,0转换成半角,1转换成全角
) RETURNS nvarchar(4000)
AS
BEGIN
 DECLARE @pat nvarchar(8),@step int,@i int,@spc int

 IF @flag=0
   SELECT @pat=N'%[！-～]%', @step=-65248, @str=REPLACE(@str,N'　 ',N' ');
 ELSE
   SELECT @pat=N'%[!-~]%', @step=65248, @str=REPLACE(@str,N' ',N'　 ');

 SET @i = PATINDEX(@pat COLLATE LATIN1_GENERAL_BIN, @str);

 WHILE @i > 0
  SELECT @str=REPLACE(@str
                     ,SUBSTRING(@str,@i,1)
                     ,NCHAR(UNICODE(SUBSTRING(@str,@i,1))+@step))
                     ,@i=PATINDEX(@pat COLLATE LATIN1_GENERAL_BIN
                     ,@str);
 RETURN(@str);
END;
GO

2. 调用方法

 DECLARE @s1 varchar(8000);
 SET @s1='中   　２-３４５６a７８ＳＴＵＶabｎ中国ｏｐｗｘｙｚ';
 SELECT dbo.Fn_Convert_Semiangle(@s1,0) AS 转半角,dbo.Fn_Convert_Semiangle(@s1,1) AS 转全角;

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