T-SQL Extractor

/******************************************************************************

  • Author: iret
  • Desc: T-SQL Extractor
  • Extract the comments and blanks and tabs from the SQL statement
  • 为了比较两个存储过程,或者SQL语句是否一致,抽空写了一个可以删除T-SQL 语句中的注释和空格的脚本,挺精致的样子。
  • Created Date: 2004/10/21
    ******************************************************************************/

DECLARE @script VARCHAR(8000), @extractedScript VARCHAR(4000)
SET @script = ''
/从系统表获取存储过程的脚本/
SELECT @script = @script + [text]
FROM syscomments, sysobjects
WHERE
syscomments.[id] = sysobjects.[id] AND sysobjects.[name] LIKE '%campa_AppSegment'

/标志符/
DECLARE @InLineCommented BIT, @InSectionCommented BIT, @InString BIT, @position INT

/当前字符/
DECLARE @curChar INT

/前一个字符/
DECLARE @preChar INT

SET @InLineCommented = 0
SET @InSectionCommented = 0
SET @InString = 0

SET @extractedScript = ''
SET @position = 1
SET @preChar = null

WHILE @position <= DATALENGTH(@script)
BEGIN
--获取当前字符
SET @curChar = ASCII(SUBSTRING(@script, @position, 1))
IF @preChar = ASCII('/') AND @curChar = ASCII('*') AND @InLineCommented = 0 AND @InString = 0
BEGIN
-- SET the sign in section comment
SET @InSectionCommented = 1

--pop the / char
SET @extractedScript = substring(@extractedScript,1,len(@extractedScript)-1)

SET @preChar = @curChar
SET @position = @position + 1
CONTINUE
END

IF @preChar = ASCII('*') AND @curChar = ASCII('/') AND @InLineCommented = 0 AND @InString = 0
BEGIN
SET @InSectionCommented = 0
SET @preChar = @curChar
SET @position = @position + 1
CONTINUE
END

IF @preChar = ASCII('-') AND @curChar = ASCII('-') AND @InSectionCommented = 0 AND @InString = 0
BEGIN
SET @InLineCommented = 1

--pop the / char
SET @extractedScript = substring(@extractedScript,1,len(@extractedScript)-1)

SET @preChar = @curChar
SET @position = @position + 1
CONTINUE
END

IF @curChar = ASCII('''') AND @InString = 0 AND @InSectionCommented = 0 AND @InLineCommented = 0
BEGIN
SET @InString = 1
END

IF @inString = 1 AND @curChar = ASCII('''')
BEGIN
IF ASCII(SUBSTRING(@script, @position+1, 1))= ASCII('''')
BEGIN
SET @extractedScript = @extractedScript + ''''
SET @position = @position + 1
END
ELSE
BEGIN
SET @InString = 0
END
END

IF @InSectionCommented = 1
BEGIN
SET @preChar = @curChar
SET @position = @position + 1
CONTINUE
END

IF @InLineCommented = 1
BEGIN
-- if meets the end of the line set the InLineCommented to false
IF @curChar = 10 AND @preChar = 13
BEGIN
SET @InLineCommented = 0
END

SET @preChar = @curChar
SET @position = @position + 1
CONTINUE
END

IF @curChar = ASCII(' ') OR @curChar = 10 OR @curChar =13 OR @curChar = ASCII(' ') OR @curChar = 32
BEGIN
SET @preChar = @curChar
SET @position = @position + 1
CONTINUE
END

SET @extractedScript = @extractedScript + CHAR(@curChar)
SET @preChar = @curChar
SET @position = @position + 1
END

-- print the result script
SELECT @extractedScript

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