原文 http://www.gyurcit.hu/pivot.html

Dynamic Pivot table wizard

This stored procedure generate dynamic crosstable with multiple pivot columns by 4+1 parameters.

1. P_Row_Field Name of field that reperesent the spreadsheet's rows
2. P_Column_Field Name of field that store the name of columns
3. P_Value Name of field that represent the spreedsheet's value
4. P_From Name of source table
5. P_Where Filter expression (optional)

Values of second parameter field should not include apastrophe.  Procedure does not check paramaters (you must do that), so it may causes sql injection attack.

To source code click one of them

 
-- =================================================
-- Pivot Table Wizard (c) 2009 by GyurcIT
-- http://www.gyurcit.hu e-mail: gyurcit@gmail.com
-- ================================================= IF EXISTS (SELECT name FROM sysobjects
WHERE name = N'PivotWizard' AND type = 'P')
DROP PROCEDURE PivotWizard
GO
-----------------------------------------------------
-----------------------------------------------------
CREATE PROCEDURE PivotWizard
@P_Row_Field VARCHAR(255),
@P_Column_Field VARCHAR(255),
@P_Value VARCHAR(255),
@P_From VARCHAR(4000),
@P_Where VARCHAR(4000) = '1=1'
AS DECLARE @SQL NVARCHAR(4000) -- Build SQL statment that upload @Columns string
  -- with @P_Column_Filed values
CREATE TABLE #TEMP (ColumnField varchar(100))
SET @sql ='SELECT DISTINCT '+@P_Column_Field+' AS ColumnField'+
' FROM '+@P_From+
' WHERE '+@P_Where+
' ORDER BY '+@P_Column_Field
INSERT INTO #TEMP
EXEC(@sql)
PRINT @sql -- Check count of columns
DECLARE @Count_Columns int
SELECT @Count_Columns = COUNT(*) FROM #Temp
IF (@Count_Columns<1) OR (@Count_Columns>255) BEGIN
DROP TABLE #Temp
RAISERROR('%d is invalid columns amount. Valid is 1-255',
16,1,@Count_columns)
RETURN
END
-- Upload @Columns from #Temp
DECLARE @Columns VARCHAR(8000),
@Column_Field VARCHAR(8000) SET @Columns = ''
DECLARE Column_cursor CURSOR LOCAL FOR
SELECT CAST(ColumnField AS VARCHAR(60))
FROM #Temp
OPEN Column_cursor
FETCH NEXT FROM Column_cursor
INTO @Column_Field
WHILE @@FETCH_STATUS = 0 BEGIN
SET @Columns = @Columns +
' SUM('+
' CASE WHEN '+@P_Column_Field+'='''+ @Column_Field+''''+
' THEN '+@P_Value+
' ELSE 0 END'+
') AS ['+ @Column_Field +'], '
FETCH NEXT FROM Column_cursor
INTO @Column_Field
END
CLOSE Column_cursor
DEALLOCATE Column_cursor
DROP TABLE #Temp IF @Columns='' RETURN 1
SET @Columns = Left(@Columns,Len(@Columns)-1) -- Build Pivot SQL statment
DECLARE @Pivot_SQL VARCHAR(8000)
SET @Pivot_SQL = 'SELECT ' +@P_Row_Field+', '+@Columns
SET @Pivot_SQL = @Pivot_SQL +' FROM ' +@P_From
SET @Pivot_SQL = @Pivot_SQL +' WHERE ' +@P_Where
SET @Pivot_SQL = @Pivot_SQL +' GROUP BY '+@P_Row_Field
SET @Pivot_SQL = @Pivot_SQL +' ORDER BY '+@P_Row_Field
SET @Pivot_SQL = @Pivot_SQL + '#' IF Right(@Pivot_SQL,1)<>'#'
BEGIN
RAISERROR('SQL statement is too long. It must be less
                than 8000 charachter!',16,1)
RETURN 1
END
SET @Pivot_SQL = Left(@Pivot_SQL,Len(@Pivot_SQL)-1) -- PRINT @Pivot_SQL
EXEC(@Pivot_SQL) RETURN 0
GO -- Example use Northwind database --
-- Example 1 --
exec PivotWizard 'ShipCountry',
'YEAR(OrderDate)*100+Month(OrderDate)',
'[ExtendedPrice]',
'dbo.Invoices',
'OrderDate BETWEEN ''1996/01/01'' and ''1996/12/31''' GO -- Example 2 --
exec PivotWizard 'ProductName',
'ShipCountry',
'[ExtendedPrice]',
'dbo.Invoices',
'OrderDate BETWEEN ''1996/01/01'' and ''1996/12/31'''
-- =================================================
-- Pivot Table Wizard MySQL (c) 2009 by GyurcIT
-- http://www.gyurcit.hu e-mail: gyurcit@gmail.com
-- =================================================
-- USE Database
DROP PROCEDURE IF EXISTS pivotwizard; CREATE DEFINER = 'root'@'192.168.1.119'
PROCEDURE pivotwizard(
IN P_Row_Field VARCHAR(255),
IN P_Column_Field VARCHAR(255),
IN P_Value VARCHAR(255),
IN P_From VARCHAR(4000),
IN P_Where VARCHAR(4000))
BEGIN
DECLARE done INT DEFAULT 0;
DECLARE M_Count_Columns int DEFAULT 0;
DECLARE M_Column_Field varchar(60);
DECLARE M_Columns VARCHAR(8000) DEFAULT '';
DECLARE M_sqltext VARCHAR(8000);
DECLARE M_stmt VARCHAR(8000);
DECLARE cur1 CURSOR FOR SELECT CAST(Column_Field AS CHAR) FROM Temp;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1; DROP TABLE IF EXISTS Temp;
SET @M_sqltext = CONCAT('CREATE TEMPORARY TABLE Temp ',
' SELECT DISTINCT ',P_Column_Field,
				' AS Column_Field',
' FROM ',P_From,
' WHERE ',P_Where,
' ORDER BY ', P_Column_Field); PREPARE M_stmt FROM @M_sqltext;
EXECUTE M_stmt; SELECT COUNT(*) INTO M_Count_Columns
 FROM Temp 
 WHERE Column_Field IS NOT NULL;

 IF (M_Count_Columns > 0) THEN
OPEN cur1;
REPEAT
FETCH cur1 INTO M_Column_Field;
IF (NOT done) and (M_Column_Field IS NOT NULL) THEN
SET M_Columns = CONCAT(M_Columns,
' SUM( CASE WHEN ',P_Column_Field,'=''',M_Column_Field,'''',
' THEN ',P_Value,
' ELSE 0 END) AS `', M_Column_Field ,'`,'); END IF;
UNTIL done END REPEAT;
    SET M_Columns = Left(M_Columns,Length(M_Columns)-1);
SET @M_sqltext = CONCAT('SELECT ',P_Row_Field,',',M_Columns,
' FROM ', P_From,
' WHERE ', P_Where,
' GROUP BY ', P_Row_Field,
' ORDER BY ', P_Row_Field); PREPARE M_stmt FROM @M_sqltext;
EXECUTE M_stmt;
END IF;
END
-- Example:
CALL pivotwizard('article','Month(date)',
'netto',
'invoice',
'(year(date)=2009)')

 

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