How to add pagination to this dynamic sql - sql

Question

I have the following table with its respective data
CREATE TABLE [dbo].[Columns]
(
[ColumnId] INT,
[TableId] INT NOT NULL,
[ColumnName] NVARCHAR(150) NOT NULL,
[Order] INT,
[Key] BIT
)
CREATE TABLE [dbo].[Tables]
(
[TableId] INT,
[TableName] NVARCHAR(200),
[DistrictId] INT
)
CREATE TABLE [dbo].[RowValues]
(
[ColumnId] INT NOT NULL,
[RowNumber] INT NOT NULL,
[Value] NVARCHAR(200) NOT NULL
)
insert into [Columns] values (1, 1, 'StudentName', 1, 1)
insert into [Columns] values (2, 1, 'Grade', 1, 0)
insert into [Columns] values (3, 1, 'Year', 1, 0)
insert into [Columns] values (4, 1, 'Section', 1, 0)
insert into [Columns] values (5, 2, 'TeacherName', 1, 1)
insert into [Columns] values (6, 2, 'Department', 1, 0)
insert into [Tables] values (1, 'Student', 1)
insert into [Tables] values (2, 'Teacher', 1)
insert into [RowValues] values (1, 1, 'Student Alan')
insert into [RowValues] values (2, 1, '99')
insert into [RowValues] values (3, 1, '1st')
insert into [RowValues] values (4, 1, 'Section 1')
insert into [RowValues] values (1, 2, 'Student Alex')
insert into [RowValues] values (2, 2, '98')
insert into [RowValues] values (3, 2, '1st')
insert into [RowValues] values (4, 2, 'Section 1')
insert into [RowValues] values (1, 3, 'Student Alfonso')
insert into [RowValues] values (2, 3, '97')
insert into [RowValues] values (3, 3, '1st')
insert into [RowValues] values (4, 3, 'Section 1')
insert into [RowValues] values (1, 4, 'Student Ben')
insert into [RowValues] values (2, 4, '96')
insert into [RowValues] values (3, 4, '1st')
insert into [RowValues] values (4, 4, 'Section 1')
insert into [RowValues] values (1, 5, 'Student Cathy')
insert into [RowValues] values (2, 5, '95')
insert into [RowValues] values (3, 5, '1st')
insert into [RowValues] values (4, 5, 'Section 1')
insert into [RowValues] values (5, 1, 'Teacher Tesso')
insert into [RowValues] values (6, 1, 'Biology Dept')
insert into [RowValues] values (5, 2, 'Teacher Marvin')
insert into [RowValues] values (6, 2, 'Math Dept')
I wanted to be able to sort the dynamic column
example sort by 'StudentName' ASC it would sort data using column returning
When sorting by StudentName:
StudentName Grade Year Section
'Student Alan' 99 '1st' 'Section 1'
'Student Alex' 98 '1st' 'Section 1'
'Student Alfonso' 97 '1st' 'Section 1'
.
.
.
When sorting by Grade ASC:
StudentName Grade Year Section
'Student Cathy' 95 '1st' 'Section 1'
'Student Ben' 96 '1st' 'Section 1'
'Student Alfonso' 97 '1st' 'Section 1'
.
.
.
When sorting by TeacherName ASC (different table)
TeacherName Department
'Teacher Marvin' 'Math Dept'
'Teacher Tesso' 'Biology Dept'
.
.
.
I have manage to accomplish this.
The problem is adding Pagination to my dynamic SQL string.
This is my stored procedure
CREATE PROCEDURE [dbo].[usp_DynamicSearch_Paged]
(#districtId INT,
#searchTerm NVARCHAR(max),
#pageNumber INT = 1,
#pageSize INT = 10,
#sortColumn NVARCHAR(20),
#sortDirection INT)
AS
BEGIN
DECLARE #columns nvarchar(max),
#sql nvarchar(max),
#rows int
SET #rows = (#pageNumber - 1) * #pageSize;
SELECT
#columns = (SELECT ',' + QUOTENAME(ColumnName)
FROM Tables AS T
INNER JOIN Columns AS C ON T.TableId = C.TableId
WHERE T.districtId = #districtId
ORDER BY C.[Order]
FOR XML PATH(''))
SELECT
#columns = (SELECT ',' + QUOTENAME(ColumnName)
FROM Tables AS T
INNER JOIN Columns AS C ON T.TableId = C.TableId
WHERE T.districtId = #districtId
ORDER BY C.[Order]
FOR XML PATH(''))
SELECT [Columns] = REPLACE(REPLACE(value,'[',''),']','')
FROM STRING_SPLIT(STUFF(#Columns, 1, 1, ''),',')
SET #sql = N'
SELECT * INTO #Fields FROM (
SELECT
ROW_NUMBER() OVER (PARTITION BY ColumnName ORDER BY (SELECT NULL)) RN,
districtId,
ColumnName
, V.[Value]
FROM Tables AS T
INNER JOIN Columns AS C
ON T.TableId = C.TableId
LEFT OUTER JOIN RowValues AS V
ON C.ColumnId = V.ColumnId
) t
PIVOT (
MIN([Value])
FOR [ColumnName]
IN ('
+ STUFF(#Columns, 1, 1, '') +
')
) AS PivotTable
DECLARE #KeyColumnName NVARCHAR(100)
SELECT #KeyColumnName = ColumnName
FROM Tables AS T
INNER JOIN Columns AS C
ON T.TableId = C.TableId
WHERE T.districtId = ' + CAST(#districtId AS VARCHAR) + '
AND C.IsKey = 1
DECLARE #sql NVARCHAR(MAX)
SET #SQL = ''
SELECT *
FROM #Fields
WHERE '' + #KeyColumnName + '' LIKE '''''+ #searchTerm +'%''''
''
OFFSET ('+CAST(#rows AS VARCHAR)+') ROWS
FETCH NEXT ' +CAST(#pageSize AS VARCHAR) +' ROWS ONLY;
EXEC sp_EXECUTESQL #sql
'
EXEC sp_executesql #sql
END
I just added the
OFFSET ('+CAST(#rows AS VARCHAR)+') ROWS
FETCH NEXT ' +CAST(#pageSize AS VARCHAR) +' ROWS ONLY;
EXEC sp_EXECUTESQL #sql
and now it doesn't work

Answer 1

The OFFSET and FETCH clauses are the options of the ORDER BY clause. They allow you to limit the number of rows to be returned by a query.
https://www.sqlservertutorial.net/sql-server-basics/sql-server-offset-fetch/
I think you need to declare ORDER BY