作为功能

Question

对sproc进行故障排除后，我意识到字段有一个额外的字符，我假设空白或者某些特殊字符不可见。例如，city字段包含值'Abbeville'，其长度（LEN（[city]）为10.我以为我可以使用以下内容修剪空白区域：

  UPDATE US_City_State
  SET [City] = RTRIM(LTRIM([City]))

那不起作用。我转向varbinary但我不知道该怎么做。该列定义为nvarchar。这是演员值。

  0x4100620062006500760069006C006C006500A000

[更新]样本数据

  City          City_Hex_Value
  Aaronsburg    0x4100610072006F006E0073006200750072006700A000
  Abbeville     0x4100620062006500760069006C006C006500A000

谢谢！

Answer 1

也许空白不仅仅是一个空间：

试试这个：

  UPDATE US_City_State
  SET [City] = LTRIM(RTRIM(REPLACE(REPLACE(REPLACE(REPLACE([City], CHAR(10), ''), CHAR(13), ''), CHAR(9), ''), CHAR(160), '')))

<强>说明：一些空白区域并不是真正的空间（＆＃39;＆＃39;）。以下是一些空白：

CHAR(9)     =   Horizontal Tab
CHAR(10)    =   Line Feed
CHAR(13)    =   Carriage Return
CHAR(160)   =   Non-Breaking Space

我做的是删除上面的空格。您可以按空格（＆＃39;＆＃39;）或CHAR(32)替换它，具体取决于您希望如何处理它们。

Answer 2

TRIM所有SPACE的{{1}}和TAB：

ENTER

作为功能

DECLARE @Str VARCHAR(MAX) = '      
          [         Foo    ]       
          '

DECLARE @NewStr VARCHAR(MAX) = ''
DECLARE @WhiteChars VARCHAR(4) =
      CHAR(13) + CHAR(10) -- ENTER
    + CHAR(9) -- TAB
    + ' ' -- SPACE

;WITH Split(Chr, Pos) AS (
    SELECT
          SUBSTRING(@Str, 1, 1) AS Chr
        , 1 AS Pos
    UNION ALL
    SELECT
          SUBSTRING(@Str, Pos, 1) AS Chr
        , Pos + 1 AS Pos
    FROM Split
    WHERE Pos <= LEN(@Str)
)
SELECT @NewStr = @NewStr + Chr
FROM Split
WHERE
    Pos >= (
        SELECT MIN(Pos)
        FROM Split
        WHERE CHARINDEX(Chr, @WhiteChars) = 0
    )
    AND Pos <= (
        SELECT MAX(Pos)
        FROM Split
        WHERE CHARINDEX(Chr, @WhiteChars) = 0
    )

SELECT '"' + @NewStr + '"'

实施例

CREATE FUNCTION StrTrim(@Str VARCHAR(MAX)) RETURNS VARCHAR(MAX) BEGIN
    DECLARE @NewStr VARCHAR(MAX) = NULL

    IF (@Str IS NOT NULL) BEGIN
        SET @NewStr = ''

        DECLARE @WhiteChars VARCHAR(4) =
              CHAR(13) + CHAR(10) -- ENTER
            + CHAR(9) -- TAB
            + ' ' -- SPACE

        IF (@Str LIKE ('%[' + @WhiteChars + ']%')) BEGIN

            ;WITH Split(Chr, Pos) AS (
                SELECT
                      SUBSTRING(@Str, 1, 1) AS Chr
                    , 1 AS Pos
                UNION ALL
                SELECT
                      SUBSTRING(@Str, Pos, 1) AS Chr
                    , Pos + 1 AS Pos
                FROM Split
                WHERE Pos <= LEN(@Str)
            )
            SELECT @NewStr = @NewStr + Chr
            FROM Split
            WHERE
                Pos >= (
                    SELECT MIN(Pos)
                    FROM Split
                    WHERE CHARINDEX(Chr, @WhiteChars) = 0
                )
                AND Pos <= (
                    SELECT MAX(Pos)
                    FROM Split
                    WHERE CHARINDEX(Chr, @WhiteChars) = 0
                )
        END
    END

    RETURN @NewStr
END

<强>结果

-- Test
DECLARE @Str VARCHAR(MAX) = '      
          [         Foo    ]       
              '

SELECT 'Str', '"' + dbo.StrTrim(@Str) + '"'
UNION SELECT 'EMPTY', '"' + dbo.StrTrim('') + '"'
UNION SELECT 'EMTPY', '"' + dbo.StrTrim('      ') + '"'
UNION SELECT 'NULL', '"' + dbo.StrTrim(NULL) + '"'

来源：How to use a TRIM function in SQL Server

SQL Server RTRIM（LTRIM（[City]））不剥离空格

2 个答案:

作为功能

实施例