loop through rows and INSERT INTO SELECT from the same table - sql-server

Question

I'm trying to create a stored procedure in SQL-Server2012, that will update some rows, then re-insert them again into the same table but with NULLs or different calculated values.
my table 'schedule':
CREATE TABLE [cil].[schedule](
[id] [int] IDENTITY(1,1) NOT NULL,
[taskFK] [int] NULL,
[scheduledDate] [smalldatetime] NULL,
[completionDate] [smalldatetime] NULL,
[rotaCycle] [smallint] NULL,
[result] [smallint] NULL,
CONSTRAINT [PK_schedule] PRIMARY KEY CLUSTERED
my table 'task':
CREATE TABLE [cil].[task](
[id] [int] IDENTITY(1,1) NOT NULL,
[standard] [varchar](250) NULL,
[equipFK] [int] NULL,
[areaFK] [smallint] NULL,
CONSTRAINT [PK_task] PRIMARY KEY CLUSTERED
existing stored procedure:
CREATE PROCEDURE [cil].[updateCompletionDate]
#equipID int,
#myCompletionDate datetime
AS
UPDATE cil.schedule SET completionDate=#myCompletionDate
WHERE schedule.id IN (
SELECT schedule.id
FROM cil.schedule
LEFT JOIN cil.task
ON cil.schedule.taskFK=cil.task.id
WHERE CAST(scheduledDate AS DATE)<=CAST(GetDate() AS DATE)
AND completionDate IS NULL
AND result IS NOT NULL
AND equipFK=#equipID);
GO
and now I want to add the RE-INSERT to the above SP:
INSERT INTO cil.schedule (taskFK, scheduledDate, rotaCycle)
SELECT taskFK, scheduledDate = DATEADD(dd, (SELECT rotaCycle FROM
cil.schedule WHERE id=??),scheduledDate), rotaCycle
FROM cil.schedule LEFT JOIN cil.task ON task.id=schedule.taskFK
WHERE completionDate=#myCompletionDate
AND task.equipFK=#equipID;
Dont know how to loop through all ID from 1st part of the SP?

Answer 1

you can do this by using output clause and delete table. i have created below pseudo code to give you some idea how this will work -
CREATE PROCEDURE [cil].[updateCompletionDate]
#equipID int,
#myCompletionDate datetime
AS
DECLARE #MyTable table(
id int ,
taskFK int
.... ); -- declare all required columns
UPDATE cil.schedule SET completionDate=#myCompletionDate
OUTPUT deleted.id,
deleted.taskFK -- list of required columns you want
INTO #MyTable
WHERE schedule.id IN (
SELECT schedule.id
FROM cil.schedule
LEFT JOIN cil.task
ON cil.schedule.taskFK=cil.task.id
WHERE CAST(scheduledDate AS DATE)<=CAST(GetDate() AS DATE)
AND completionDate IS NULL
AND result IS NOT NULL
AND equipFK=#equipID)
INSERT INTO cil.schedule (taskFK, scheduledDate, rotaCycle)
select [required coluns]
from #MyTableVa join cil.schedule -- all requied join conditions

Answer 2

You can use SQL Output clause to update your table and insert effected rows into the same table
Please check following simple sample script
/*
create table OutputClauseSample (
Id int identity(1,1),
Code varchar(10),
Val int
)
insert into OutputClauseSample select 'A',10
insert into OutputClauseSample select 'B',20
insert into OutputClauseSample select 'C',30
*/
update OutputClauseSample
set Val = 2 * Val
output (deleted.Code)
into OutputClauseSample (Code)
where id = 3
select * from OutputClauseSample

Answer 3

here is my procedure, cursor loops through and re-inserts modified correctly data:
CREATE PROCEDURE [cil].[addComplDateAnd_ReSchedule]
#equipID int,
#myCompletionDate datetime2(6)
AS
/* add completion date */
UPDATE cil.schedule SET completionDate=#myCompletionDate
WHERE schedule.id IN (
SELECT schedule.id
FROM cil.schedule
LEFT JOIN cil.task ON cil.schedule.taskFK=cil.task.id
WHERE CAST(scheduledDate AS DATE)<=CAST(GetDate() AS DATE)
AND completionDate IS NULL
AND result IS NOT NULL
AND equipFK=#equipID);
/* reschedule tasks */
DECLARE #nextTaskID AS INT;
DECLARE #nextScheduledDate AS DATETIME2(6);
DECLARE #nextRotaCycle AS INT;
DECLARE db_cursor CURSOR FOR
SELECT taskFK, scheduledDate, rotaCycle
FROM cil.schedule
LEFT JOIN cil.task ON cil.schedule.taskFK=cil.task.id
WHERE completionDate=#myCompletionDate
AND equipFK=#equipID;
OPEN db_cursor;
FETCH NEXT FROM db_cursor INTO #nextTaskID, #nextScheduledDate, #nextRotaCycle;
WHILE ##FETCH_STATUS = 0
BEGIN
--Do stuff with scalar values
INSERT INTO cil.schedule (taskFK, scheduledDate, rotaCycle)
VALUES(#nextTaskID
,DATEADD(dd, #nextRotaCycle, #nextScheduledDate)
,#nextRotaCycle)
FETCH NEXT FROM db_cursor INTO #nextTaskID, #nextScheduledDate,
#nextRotaCycle;
END;
CLOSE db_cursor;
DEALLOCATE db_cursor;
GO