How to replace where clause with a function and use it in stored procedures? - sql

Question

I have two stored procedures that they have the same where clause, one of them is use for pagination:
ALTER PROCEDURE [dbo].[ret_PayrollCalculations_GetPagedFilteredPersonnels]
(
#SortField varchar(512),
#PageNo int,
#PageSize int,
#CalculationCommandType int,
#StartWorkingPeriodId int,
#StartYear int,
#EndWorkingPeriodId int,
#EndYear int,
#Status int,
#SalariedGuid uniqueidentifier,
#SalariedType int,
#OfficeNumber varchar(64),
#SalariedResultSetId int,
#Keyword nvarchar(2024),
#OperationalUnitIds [dbo].[ListOfID] READONLY
)
AS
DECLARE #AccessibleSalariedGuids [dbo].[ListOfGuid]
IF EXISTS (SELECT * FROM #OperationalUnitIDs)
BEGIN
INSERT INTO #AccessibleSalariedGuids
SELECT FeatureGuid FROM prs_OperationalUnitFeatures
WHERE
OperationalUnitID in (SELECT * FROM #OperationalUnitIDs) AND
FeatureFlag IN (2,4)
END
ELSE BEGIN
INSERT INTO #AccessibleSalariedGuids
SELECT [Guid] FROM ret_vwSalaried
END
DECLARE #OffsetRows INT = CASE WHEN #PageNo = 1 THEN 0 ELSE (#PageNo - 1) * #PageSize END;
DECLARE #TotalCount INT;
WITH Result AS(
SELECT
CASE
WHEN #SortField = N'[FullName]' THEN ROW_NUMBER() OVER (ORDER BY salaried.[FullName])
WHEN #SortField = N'[FullName] DESC' THEN ROW_NUMBER() OVER (ORDER BY salaried.[FullName] DESC)
WHEN #SortField = N'[WorkingPeriodTitle]' THEN ROW_NUMBER() OVER (ORDER BY calcs.[Year],workingPeriods.[Index])
WHEN #SortField = N'[WorkingPeriodTitle] DESC' THEN ROW_NUMBER() OVER (ORDER BY calcs.[Year] DESC,workingPeriods.[Index] DESC)
WHEN #SortField = N'[PersonnelNo]' THEN ROW_NUMBER() OVER (ORDER BY salaried.[PersonnelNo])
WHEN #SortField = N'[PersonnelNo] DESC' THEN ROW_NUMBER() OVER (ORDER BY salaried.[PersonnelNo] DESC)
END AS [RowNumber],
calcs.[Guid],
calcs.[CalculationCommandGuid],
calcs.[SalariedGuid],
salaried.[PersonnelNo],
salaried.[FullName] AS [PersonnelFullName],
command.[Type] [CommandType],
salaried.[SalariedType],
workingPeriods.Title AS [WorkingPeriodTitle],
command.[MainYear] AS [Year],
command.[Approved],
command.[FinalApproved]
FROM
ret_PayrollCalculationCommands command INNER JOIN
ret_PayrollCalculations calcs ON calcs.[CalculationCommandGuid] = command.[Guid] INNER JOIN
ret_vwSalaried salaried ON calcs.[SalariedGuid] = salaried.[Guid] INNER JOIN
prs_workingPeriods workingPeriods ON workingPeriods.[Id] = command.[MainWorkingPeriodID]
WHERE
ISNULL(calcs.[MainCalculation],0) = 1 AND
ISNULL(command.[Deleted],0)=0 AND
(#Keyword = '' OR salaried.PersonnelNo = #Keyword OR salaried.FullName LIKE N'%' + #Keyword + '%' OR salaried.FullNameReversed LIKE N'%' + #Keyword + '%') AND
(ISNULL(#calculationCommandType, 0) = 0 OR command.[Type] = #calculationCommandType) AND
(ISNULL(#StartYear, 0) = 0 OR command.[MainYear] >= #StartYear) AND
(ISNULL(#StartWorkingPeriodId, 0) = 0 OR command.[MainWorkingPeriodID] >= #StartWorkingPeriodId) AND
(ISNULL(#EndYear, 0) = 0 OR command.[MainYear] <= #EndYear) AND
(ISNULL(#EndWorkingPeriodId, 0) = 0 OR command.[MainWorkingPeriodID] <= #EndWorkingPeriodId) AND
(ISNULL(#Status, -1) = -1 OR command.[Approved] = #Status) AND
(ISNULL(#SalariedType, -1) = -1 OR salaried.[SalariedType] = #SalariedType) AND
(ISNULL(#SalariedGuid,'00000000-0000-0000-0000-000000000000') = '00000000-0000-0000-0000-000000000000' OR calcs.[SalariedGuid] = #SalariedGuid) AND
(#OfficeNumber IS NULL OR salaried.[OfficeNumber] LIKE '%'+#OfficeNumber+'%') AND
(ISNULL(#SalariedResultSetId, -1) = -1 OR calcs.[SalariedGuid] IN (SELECT [SalariedGuid] FROM ret_SalariedResultSetItems WHERE SalariedResultSetID = #SalariedResultSetId)) AND
(calcs.[SalariedGuid] IN (SELECT * FROM #AccessibleSalariedGuids))
), TableForTotalCount AS (SELECT COUNT(*) As TotalCount FROM Result)
SELECT
(SELECT TOP 1 TotalCount FROM TableForTotalCount) AS TotalCount,
*
FROM Result
ORDER BY
[RowNumber]
OFFSET #OffsetRows ROWS
FETCH NEXT #PageSize ROWS ONLY
and another one supposed to return some Guids
ALTER PROCEDURE [dbo].[ret_PayrollCalculations_GetFilteredPersonnels]
(
#CalculationCommandType int,
#StartWorkingPeriodId int,
#StartYear int,
#EndWorkingPeriodId int,
#EndYear int,
#Status int,
#SalariedGuid uniqueidentifier,
#SalariedType int,
#OfficeNumber varchar(64),
#SalariedResultSetId int,
#Keyword nvarchar(2024),
#OperationalUnitIds [dbo].[ListOfID] READONLY
)
AS
DECLARE #AccessibleSalariedGuids [dbo].[ListOfGuid]
IF EXISTS (SELECT * FROM #OperationalUnitIDs)
BEGIN
INSERT INTO #AccessibleSalariedGuids
SELECT FeatureGuid FROM prs_OperationalUnitFeatures
WHERE
OperationalUnitID in (SELECT * FROM #OperationalUnitIDs) AND
FeatureFlag IN (2,4)
END
ELSE BEGIN
INSERT INTO #AccessibleSalariedGuids
SELECT [Guid] FROM ret_vwSalaried
END
SELECT
calcs.[Guid]
FROM
ret_PayrollCalculationCommands command INNER JOIN
ret_PayrollCalculations calcs ON calcs.[CalculationCommandGuid] = command.[Guid] INNER JOIN
ret_vwSalaried salaried ON calcs.[SalariedGuid] = salaried.[Guid]
WHERE
ISNULL(calcs.[MainCalculation],0) = 1 AND
ISNULL(command.[Deleted],0)=0 AND
(#Keyword = '' OR salaried.PersonnelNo = #Keyword OR salaried.FullName LIKE N'%' + #Keyword + '%' OR salaried.FullNameReversed LIKE N'%' + #Keyword + '%') AND
(ISNULL(#calculationCommandType, 0) = 0 OR command.[Type] = #calculationCommandType) AND
(ISNULL(#StartYear, 0) = 0 OR command.[MainYear] >= #StartYear) AND
(ISNULL(#StartWorkingPeriodId, 0) = 0 OR command.[MainWorkingPeriodID] >= #StartWorkingPeriodId) AND
(ISNULL(#EndYear, 0) = 0 OR command.[MainYear] <= #EndYear) AND
(ISNULL(#EndWorkingPeriodId, 0) = 0 OR command.[MainWorkingPeriodID] <= #EndWorkingPeriodId) AND
(ISNULL(#Status, -1) = -1 OR command.[Approved] = #Status) AND
(ISNULL(#SalariedType, -1) = -1 OR salaried.[SalariedType] = #SalariedType) AND
(ISNULL(#SalariedGuid,'00000000-0000-0000-0000-000000000000') = '00000000-0000-0000-0000-000000000000' OR calcs.[SalariedGuid] = #SalariedGuid) AND
(#OfficeNumber IS NULL OR salaried.[OfficeNumber] LIKE '%'+#OfficeNumber+'%') AND
(ISNULL(#SalariedResultSetId, -1) = -1 OR calcs.[SalariedGuid] IN (SELECT [SalariedGuid] FROM ret_SalariedResultSetItems WHERE SalariedResultSetID = #SalariedResultSetId)) AND
(calcs.[SalariedGuid] IN (SELECT * FROM #AccessibleSalariedGuids))
When a bug appears I have to fix the problem in both stored procedures, to avoid duplication I wanted Where clauses in a function and call the function in stored procedures,
But I don't know how?

Answer 1

This is how I would approach this:
If you're using Microsoft sql-server, you can make transact-sql code.
Convert your sql procedure into a string and make the Where clause a text variable that you declare elsewhere.
So it's creating a meta- procedure.
For eg.
DECLARE #whereClause LONGTEXT;
DECLARE #SQLString LONGTEXT;
SET #whereClause = 'i=1'
SET #SQLString = 'SELECT * FROM table WHERE' & #whereClause
sp_executesql SQLString