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Stored procedure nested output

Posted on 2009-05-05
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Last Modified: 2012-05-06
I have a stored procedure that I want to return all those fields in a table that are null throughout the records. Basically will show unused fields in a table. I am passing @TableName as an input parameter and intend to use the output as a simple column on a report in SSRS.

PROBLEM: I can't get the output of a stored procedure. It has a nested execute statement and is only returning one field.
SProc is below.

Grateful thanks in advanced.
USE [Metastorm]
GO
/****** Object:  StoredProcedure [dbo].[usp_ReportPackNullFields]    Script Date: 05/05/2009 11:02:35 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER PROCEDURE [dbo].[usp_ReportPackNullFields]
	@TableName varchar(100)
AS
BEGIN
    SET NOCOUNT ON;
	DECLARE @query nvarchar(max);
	DECLARE @Colname nvarchar(100);
    DECLARE @column sysname;
    DECLARE columns_cursor CURSOR FOR
    	SELECT c.name
    	FROM sys.tables t JOIN sys.columns c ON t.object_id = c.object_id
    	WHERE t.name = @tablename AND c.is_nullable = 1;
    OPEN columns_cursor;
    FETCH NEXT FROM columns_cursor INTO @column;
    WHILE (@@FETCH_STATUS = 0)
    BEGIN
    	SET @query = N'
    	DECLARE @c int;
		DECLARE @column nvarchar(100);
		SELECT @c = COUNT(*) FROM ' + @tablename + ' WHERE ' + @column + N' IS NOT NULL
    	IF (@c = 0)
			SELECT (''' + @column + N''') AS NullColumn;'
		EXECUTE (@query);
		FETCH NEXT FROM columns_cursor INTO @column;
    END
    CLOSE columns_cursor;
    DEALLOCATE columns_cursor;
    SET NOCOUNT OFF;
END;

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Question by:BrightRaven
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3 Comments
 
LVL 22

Expert Comment

by:pivar
ID: 24303605
Hi,

You can fill a temptable and return it at the end of the sp.

/peter


USE [Metastorm]
GO
/****** Object:  StoredProcedure [dbo].[usp_ReportPackNullFields]    Script Date: 05/05/2009 11:02:35 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER PROCEDURE [dbo].[usp_ReportPackNullFields]
        @TableName varchar(100)
AS
BEGIN
    SET NOCOUNT ON;
 
CREATE table #result (Nullcolumn varchar(100))
 
        DECLARE @query nvarchar(max);
        DECLARE @Colname nvarchar(100);
    DECLARE @column sysname;
    DECLARE columns_cursor CURSOR FOR
        SELECT c.name
        FROM sys.tables t JOIN sys.columns c ON t.object_id = c.object_id
        WHERE t.name = @tablename AND c.is_nullable = 1;
    OPEN columns_cursor;
    FETCH NEXT FROM columns_cursor INTO @column;
    WHILE (@@FETCH_STATUS = 0)
    BEGIN
        SET @query = N'
        DECLARE @c int;
                DECLARE @column nvarchar(100);
                SELECT @c = COUNT(*) FROM ' + @tablename + ' WHERE ' + @column + N' IS NOT NULL
        IF (@c = 0)
                SELECT (''' + @column + N''') AS NullColumn;'
        INSERT INTO #result
                EXECUTE (@query);
        END
                FETCH NEXT FROM columns_cursor INTO @column;
    END
    CLOSE columns_cursor;
    DEALLOCATE columns_cursor;
 
    SELECT * FROM #result
 
    SET NOCOUNT OFF;
END;

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LVL 22

Accepted Solution

by:
pivar earned 2000 total points
ID: 24303617
Sorry, a typo. Remove END after EXECUTE(@query), like this
USE [Metastorm]
GO
/****** Object:  StoredProcedure [dbo].[usp_ReportPackNullFields]    Script Date: 05/05/2009 11:02:35 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER PROCEDURE [dbo].[usp_ReportPackNullFields]
        @TableName varchar(100)
AS
BEGIN
    SET NOCOUNT ON;
 
CREATE table #result (Nullcolumn varchar(100))
 
        DECLARE @query nvarchar(max);
        DECLARE @Colname nvarchar(100);
    DECLARE @column sysname;
    DECLARE columns_cursor CURSOR FOR
        SELECT c.name
        FROM sys.tables t JOIN sys.columns c ON t.object_id = c.object_id
        WHERE t.name = @tablename AND c.is_nullable = 1;
    OPEN columns_cursor;
    FETCH NEXT FROM columns_cursor INTO @column;
    WHILE (@@FETCH_STATUS = 0)
    BEGIN
        SET @query = N'
        DECLARE @c int;
                DECLARE @column nvarchar(100);
                SELECT @c = COUNT(*) FROM ' + @tablename + ' WHERE ' + @column + N' IS NOT NULL
        IF (@c = 0)
                SELECT (''' + @column + N''') AS NullColumn;'
        INSERT INTO #result
                EXECUTE (@query);
                FETCH NEXT FROM columns_cursor INTO @column;
    END
    CLOSE columns_cursor;
    DEALLOCATE columns_cursor;
 
    SELECT * FROM #result
 
    SET NOCOUNT OFF;
END;

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Author Closing Comment

by:BrightRaven
ID: 31577965
Many thanks. Works a treat.
0

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