问题
I have a code which is:
DECLARE @Script VARCHAR(MAX)
SELECT @Script = definition FROM manged.sys.all_sql_modules sq
where sq.object_id = (SELECT object_id from managed.sys.objects
Where type = 'P' and Name = 'usp_gen_data')
Declare @Pos int
SELECT @pos=CHARINDEX(CHAR(13)+CHAR(10),@script,7500)
PRINT SUBSTRING(@Script,1,@Pos)
PRINT SUBSTRING(@script,@pos,8000)
The length of the Script is around 10,000 Characters and Since I am using print Statement which can hold only max of 8000. So I am using two print statements.
The problem is when I have a script which is of say 18000 characters then I used to use 3 print statements.
So Is there a way that I could set the number of print statements depending on the length of the script?
回答1:
You could do a WHILE loop based on the count on your script length divided by 8000.
EG:
DECLARE @Counter INT
SET @Counter = 0
DECLARE @TotalPrints INT
SET @TotalPrints = (LEN(@script) / 8000) + 1
WHILE @Counter < @TotalPrints
BEGIN
-- Do your printing...
SET @Counter = @Counter + 1
END
回答2:
I know it's an old question, but what I did is not mentioned here.
For me the following worked.
DECLARE @info NVARCHAR(MAX)
--SET @info to something big
PRINT CAST(@info AS NTEXT)
回答3:
The following workaround does not use the PRINT statement. It works well in combination with the SQL Server Management Studio.
SELECT CAST('<root><![CDATA[' + @MyLongString + ']]></root>' AS XML)
You can click on the returned XML to expand it in the built-in XML viewer.
There is a pretty generous client side limit on the displayed size. Go to Tools/Options/Query Results/SQL Server/Results to Grid/XML data to adjust it if needed.
回答4:
Here is how this should be done:
DECLARE @String NVARCHAR(MAX);
DECLARE @CurrentEnd BIGINT; /* track the length of the next substring */
DECLARE @offset tinyint; /*tracks the amount of offset needed */
set @string = replace( replace(@string, char(13) + char(10), char(10)) , char(13), char(10))
WHILE LEN(@String) > 1
BEGIN
IF CHARINDEX(CHAR(10), @String) between 1 AND 4000
BEGIN
SET @CurrentEnd = CHARINDEX(char(10), @String) -1
set @offset = 2
END
ELSE
BEGIN
SET @CurrentEnd = 4000
set @offset = 1
END
PRINT SUBSTRING(@String, 1, @CurrentEnd)
set @string = SUBSTRING(@String, @CurrentEnd+@offset, LEN(@String))
END /*End While loop*/
Taken from http://ask.sqlservercentral.com/questions/3102/any-way-around-the-print-limit-of-nvarcharmax-in-s.html
回答5:
Came across this question and wanted something more simple... Try the following:
SELECT [processing-instruction(x)]=@Script FOR XML PATH(''),TYPE
回答6:
This proc correctly prints out VARCHAR(MAX) parameter considering wrapping:
CREATE PROCEDURE [dbo].[Print]
@sql varchar(max)
AS
BEGIN
declare
@n int,
@i int = 0,
@s int = 0, -- substring start posotion
@l int; -- substring length
set @n = ceiling(len(@sql) / 8000.0);
while @i < @n
begin
set @l = 8000 - charindex(char(13), reverse(substring(@sql, @s, 8000)));
print substring(@sql, @s, @l);
set @i = @i + 1;
set @s = @s + @l + 2; -- accumulation + CR/LF
end
return 0
END
回答7:
I was looking to use the print statement to debug some dynamic sql as I imagin most of you are using print for simliar reasons.
I tried a few of the solutions listed and found that Kelsey's solution works with minor tweeks (@sql is my @script) n.b. LENGTH isn't a valid function:
--http://stackoverflow.com/questions/7850477/how-to-print-varcharmax-using-print-statement
--Kelsey
DECLARE @Counter INT
SET @Counter = 0
DECLARE @TotalPrints INT
SET @TotalPrints = (LEN(@sql) / 4000) + 1
WHILE @Counter < @TotalPrints
BEGIN
PRINT SUBSTRING(@sql, @Counter * 4000, 4000)
SET @Counter = @Counter + 1
END
PRINT LEN(@sql)
This code does as commented add a new line into the output, but for debugging this isn't a problem for me.
Ben B's solution is perfect and is the most elegent, although for debugging is a lot of lines of code so I choose to use my slight modification of Kelsey's. It might be worth creating a system like stored procedure in msdb for Ben B's code which could be reused and called in one line?
Alfoks' code doesn't work unfortunately because that would have been easier.
回答8:
create procedure dbo.PrintMax @text nvarchar(max)
as
begin
declare @i int, @newline nchar(2), @print varchar(max);
set @newline = nchar(13) + nchar(10);
select @i = charindex(@newline, @text);
while (@i > 0)
begin
select @print = substring(@text,0,@i);
while (len(@print) > 8000)
begin
print substring(@print,0,8000);
select @print = substring(@print,8000,len(@print));
end
print @print;
select @text = substring(@text,@i+2,len(@text));
select @i = charindex(@newline, @text);
end
print @text;
end
回答9:
You can use this
declare @i int = 1
while Exists(Select(Substring(@Script,@i,4000))) and (@i < LEN(@Script))
begin
print Substring(@Script,@i,4000)
set @i = @i+4000
end
回答10:
Uses Line Feeds and spaces as a good break point:
declare @sqlAll as nvarchar(max)
set @sqlAll = '-- Insert all your sql here'
print '@sqlAll - truncated over 4000'
print @sqlAll
print ' '
print ' '
print ' '
print '@sqlAll - split into chunks'
declare @i int = 1, @nextspace int = 0, @newline nchar(2)
set @newline = nchar(13) + nchar(10)
while Exists(Select(Substring(@sqlAll,@i,3000))) and (@i < LEN(@sqlAll))
begin
while Substring(@sqlAll,@i+3000+@nextspace,1) <> ' ' and Substring(@sqlAll,@i+3000+@nextspace,1) <> @newline
BEGIN
set @nextspace = @nextspace + 1
end
print Substring(@sqlAll,@i,3000+@nextspace)
set @i = @i+3000+@nextspace
set @nextspace = 0
end
print ' '
print ' '
print ' '
回答11:
Or simply:
PRINT SUBSTRING(@SQL_InsertQuery, 1, 8000)
PRINT SUBSTRING(@SQL_InsertQuery, 8001, 16000)
回答12:
There is great function called PrintMax written by Bennett Dill.
Here is slightly modified version that uses temp stored procedure to avoid "schema polution"(idea from https://github.com/Toolien/sp_GenMerge/blob/master/sp_GenMerge.sql)
EXEC (N'IF EXISTS (SELECT * FROM tempdb.sys.objects
WHERE object_id = OBJECT_ID(N''tempdb..#PrintMax'')
AND type in (N''P'', N''PC''))
DROP PROCEDURE #PrintMax;');
EXEC (N'CREATE PROCEDURE #PrintMax(@iInput NVARCHAR(MAX))
AS
BEGIN
IF @iInput IS NULL
RETURN;
DECLARE @ReversedData NVARCHAR(MAX)
, @LineBreakIndex INT
, @SearchLength INT;
SET @SearchLength = 4000;
WHILE LEN(@iInput) > @SearchLength
BEGIN
SET @ReversedData = LEFT(@iInput COLLATE DATABASE_DEFAULT, @SearchLength);
SET @ReversedData = REVERSE(@ReversedData COLLATE DATABASE_DEFAULT);
SET @LineBreakIndex = CHARINDEX(CHAR(10) + CHAR(13),
@ReversedData COLLATE DATABASE_DEFAULT);
PRINT LEFT(@iInput, @SearchLength - @LineBreakIndex + 1);
SET @iInput = RIGHT(@iInput, LEN(@iInput) - @SearchLength
+ @LineBreakIndex - 1);
END;
IF LEN(@iInput) > 0
PRINT @iInput;
END;');
DBFiddle Demo
EDIT:
Using CREATE OR ALTER we could avoid two EXEC calls:
EXEC (N'CREATE OR ALTER PROCEDURE #PrintMax(@iInput NVARCHAR(MAX))
AS
BEGIN
IF @iInput IS NULL
RETURN;
DECLARE @ReversedData NVARCHAR(MAX)
, @LineBreakIndex INT
, @SearchLength INT;
SET @SearchLength = 4000;
WHILE LEN(@iInput) > @SearchLength
BEGIN
SET @ReversedData = LEFT(@iInput COLLATE DATABASE_DEFAULT, @SearchLength);
SET @ReversedData = REVERSE(@ReversedData COLLATE DATABASE_DEFAULT);
SET @LineBreakIndex = CHARINDEX(CHAR(10) + CHAR(13), @ReversedData COLLATE DATABASE_DEFAULT);
PRINT LEFT(@iInput, @SearchLength - @LineBreakIndex + 1);
SET @iInput = RIGHT(@iInput, LEN(@iInput) - @SearchLength + @LineBreakIndex - 1);
END;
IF LEN(@iInput) > 0
PRINT @iInput;
END;');
db<>fiddle Demo
回答13:
I just created a SP out of Ben's great answer:
/*
---------------------------------------------------------------------------------
PURPOSE : Print a string without the limitation of 4000 or 8000 characters.
https://stackoverflow.com/questions/7850477/how-to-print-varcharmax-using-print-statement
USAGE :
DECLARE @Result NVARCHAR(MAX)
SET @Result = 'TEST'
EXEC [dbo].[Print_Unlimited] @Result
---------------------------------------------------------------------------------
*/
ALTER PROCEDURE [dbo].[Print_Unlimited]
@String NVARCHAR(MAX)
AS
BEGIN
BEGIN TRY
---------------------------------------------------------------------------------
DECLARE @CurrentEnd BIGINT; /* track the length of the next substring */
DECLARE @Offset TINYINT; /* tracks the amount of offset needed */
SET @String = replace(replace(@String, CHAR(13) + CHAR(10), CHAR(10)), CHAR(13), CHAR(10))
WHILE LEN(@String) > 1
BEGIN
IF CHARINDEX(CHAR(10), @String) BETWEEN 1 AND 4000
BEGIN
SET @CurrentEnd = CHARINDEX(CHAR(10), @String) -1
SET @Offset = 2
END
ELSE
BEGIN
SET @CurrentEnd = 4000
SET @Offset = 1
END
PRINT SUBSTRING(@String, 1, @CurrentEnd)
SET @String = SUBSTRING(@String, @CurrentEnd + @Offset, LEN(@String))
END /*End While loop*/
---------------------------------------------------------------------------------
END TRY
BEGIN CATCH
DECLARE @ErrorMessage VARCHAR(4000)
SELECT @ErrorMessage = ERROR_MESSAGE()
RAISERROR(@ErrorMessage,16,1)
END CATCH
END
回答14:
Here's another version. This one extracts each substring to print from the main string instead of taking reducing the main string by 4000 on each loop (which might create a lot of very long strings under the hood - not sure).
CREATE PROCEDURE [Internal].[LongPrint]
@msg nvarchar(max)
AS
BEGIN
-- SET NOCOUNT ON reduces network overhead
SET NOCOUNT ON;
DECLARE @MsgLen int;
DECLARE @CurrLineStartIdx int = 1;
DECLARE @CurrLineEndIdx int;
DECLARE @CurrLineLen int;
DECLARE @SkipCount int;
-- Normalise line end characters.
SET @msg = REPLACE(@msg, char(13) + char(10), char(10));
SET @msg = REPLACE(@msg, char(13), char(10));
-- Store length of the normalised string.
SET @MsgLen = LEN(@msg);
-- Special case: Empty string.
IF @MsgLen = 0
BEGIN
PRINT '';
RETURN;
END
-- Find the end of next substring to print.
SET @CurrLineEndIdx = CHARINDEX(CHAR(10), @msg);
IF @CurrLineEndIdx BETWEEN 1 AND 4000
BEGIN
SET @CurrLineEndIdx = @CurrLineEndIdx - 1
SET @SkipCount = 2;
END
ELSE
BEGIN
SET @CurrLineEndIdx = 4000;
SET @SkipCount = 1;
END
-- Loop: Print current substring, identify next substring (a do-while pattern is preferable but TSQL doesn't have one).
WHILE @CurrLineStartIdx < @MsgLen
BEGIN
-- Print substring.
PRINT SUBSTRING(@msg, @CurrLineStartIdx, (@CurrLineEndIdx - @CurrLineStartIdx)+1);
-- Move to start of next substring.
SET @CurrLineStartIdx = @CurrLineEndIdx + @SkipCount;
-- Find the end of next substring to print.
SET @CurrLineEndIdx = CHARINDEX(CHAR(10), @msg, @CurrLineStartIdx);
SET @CurrLineLen = @CurrLineEndIdx - @CurrLineStartIdx;
-- Find bounds of next substring to print.
IF @CurrLineLen BETWEEN 1 AND 4000
BEGIN
SET @CurrLineEndIdx = @CurrLineEndIdx - 1
SET @SkipCount = 2;
END
ELSE
BEGIN
SET @CurrLineEndIdx = @CurrLineStartIdx + 4000;
SET @SkipCount = 1;
END
END
END
回答15:
This should work properly this is just an improvement of previous answers.
DECLARE @Counter INT
DECLARE @Counter1 INT
SET @Counter = 0
SET @Counter1 = 0
DECLARE @TotalPrints INT
SET @TotalPrints = (LEN(@QUERY) / 4000) + 1
print @TotalPrints
WHILE @Counter < @TotalPrints
BEGIN
-- Do your printing...
print(substring(@query,@COUNTER1,@COUNTER1+4000))
set @COUNTER1 = @Counter1+4000
SET @Counter = @Counter + 1
END
回答16:
If the source code will not have issues with LF to be replaced by CRLF, No debugging is required by following simple codes outputs.
--http://stackoverflow.com/questions/7850477/how-to-print-varcharmax-using-print-statement
--Bill Bai
SET @SQL=replace(@SQL,char(10),char(13)+char(10))
SET @SQL=replace(@SQL,char(13)+char(13)+char(10),char(13)+char(10) )
DECLARE @Position int
WHILE Len(@SQL)>0
BEGIN
SET @Position=charindex(char(10),@SQL)
PRINT left(@SQL,@Position-2)
SET @SQL=substring(@SQL,@Position+1,len(@SQL))
end;
来源：https://stackoverflow.com/questions/7850477/how-to-print-varcharmax-using-print-statement