帶分頁vb.net的SQL SELECT語句

Question

我已經看過許多其他類似的問題，但我的陳述無法解決這個問題。 這是當前有效的SELECT語句，我需要添加分頁。

      "SELECT TOP 15 * FROM  tblEvents WHERE (dbo.fnEventSearchDistance(@CityLat, " & _
      "@CityLong, latitude, longitude) <= @Radius AND (StartDate >= GETDATE())) "

這是我所能獲得的最接近的。

      "SELECT ROW_NUMBER() OVER(ORDER BY StartDate) AS RowNum, * FROM tblEvents " & _
      "WHERE RowNum BETWEEN ((@PageNum - 1) * @PageSize + 1) " & _
      "AND (@PageNum * @PageSize) " & _
      "ORDER BY StartDate"

      comm2.Parameters.AddWithValue("@PageSize", 25)
      comm2.Parameters.AddWithValue("@PageNum", 2)

我需要一個SELECT語句來重寫第一個SELECT語句以合並分頁，在這里可以添加pageSize和pageNum參數

Answer 1

假設使用SQL Server 2008及更早版本，則應嘗試以下操作：

"SELECT col1, col2 FROM (SELECT ROW_NUMBER() OVER(ORDER BY StartDate) AS RowNum, * FROM tblEvents) AS E " & _
"WHERE RowNum BETWEEN ((@PageNum - 1) * @PageSize + 1) " & _
"AND (@PageNum * @PageSize) " & _
"ORDER BY StartDate"

請注意，我將col1, col2放在了select上，您應該在其中放置所需的列。 對於SQL Server 2012，這非常簡單：

"SELECT * FROM tblEvents ORDER BY StartDate " & _ 
"OFFSET (@PageNum - 1) * @PageSize ROWS FETCH NEXT @PageNum ROWS ONLY"

Answer 2

CREATE  PROCEDURE [dbo].[usp_PageResults_NAI] 
(
    @startRowIndex int,
    @maximumRows int
)
AS

DECLARE @first_id int, @startRow int

-- A check can be added to make sure @startRowIndex isn't > count(1)
-- from employees before doing any actual work unless it is guaranteed
-- the caller won't do that

-- Get the first employeeID for our page of records
SET ROWCOUNT @startRowIndex
SELECT @first_id = employeeID FROM employees ORDER BY employeeid

-- Now, set the row count to MaximumRows and get
-- all records >= @first_id
SET ROWCOUNT @maximumRows

SELECT e.*, d.name as DepartmentName 
FROM employees e
   INNER JOIN Departments D ON
       e.DepartmentID = d.DepartmentID
WHERE employeeid >= @first_id
ORDER BY e.EmployeeID

SET ROWCOUNT 0

GO 

Answer 3

嘗試以下方法：

;With ranked AS
(
   SELECT ROW_NUMBER() OVER(ORDER BY StartDate) AS RowNum,  * 
   FROM tblEvents
)
SELECT * FROM Ranked
WHERE RowNum BETWEEN ((@PageNum - 1) * @PageSize + 1)
    AND (@PageNum * @PageSize)
    ORDER BY StartDate

Answer 4

您不能在WHERE子句中引用ROW_NUMBER ，使用公用表表達式（CTE）可以幫助進行分頁。

WITH Paging AS
(
   SELECT ROW_NUMBER() OVER (ORDER BY StartDate) AS RowNum
    , *
   FROM tblEvents
)
SELECT *
FROM Paging AS p
WHERE p.RowNum BETWEEN ((@PageNum - 1) * @PageSize + 1)
   AND (@PageNum * @PageSize)
ORDER BY p.StartDate ASC;

從SQL 2012開始，您將可以在ORDER BY訪問OFFSET FETCH ，以幫助簡化分頁並提高效率。