sql-server-2008 – 如何在存储过程中为jqGrid进行分页？

[HttpPost]
    public JsonResult GetExtraPersons(int cId,long pId,JQGridSettings gridSettings)
    {
        List<ExtraPerson> extraPersons = new List<ExtraPerson>();            
        ExtraPersonViewModel extraPersonViewModel = new ExtraPersonViewModel();
        extraPersonViewModel.CampId = cId;
        extraPersonViewModel.ReferencePatientId = pId;

        extraPersons = ExtraPersonService.GetExtraPersons(extraPersonViewModel.CampId,extraPersonViewModel.ReferencePatientId);

        int pageIndex = gridSettings.pageIndex;
        int pageSize = gridSettings.pageSize;
        int totalRecords = extraPersons.Count;
        int totalPages = (int)Math.Ceiling((float)totalRecords / (float)pageSize);

        int startRow = (pageIndex - 1) * pageSize;
        int endRow = startRow + pageSize;

        var jsonData = new
        {
            total = totalPages,page = pageIndex,records = totalRecords,rows =
            (
              extraPersons.Select(e => new
              {
                  Id = e.ExtraPersonId,FirstName = e.FirstName,LastName = e.LastName,MobilePhone = e.MobileNumber,Email = e.EmailId,PersonalNumber = e.PersonNumber,Diabetes = e.Diabetes,BloodPressure = e.BloodPressure,})
            ).ToArray()
        };
        return Json(jsonData);
    }

以及我在sql server 2008中的存储过程如下,

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER PROCEDURE [dbo].[GetExtraPerson] 
(
@CampId INT,@ReferencePatientId BIGINT
)


AS  

BEGIN  
SET NOCOUNT ON         

SELECT  

PERS.PersonId,PERS.FirstName,PERS.LastName,PERS.MobileNumber,PERS.EmailId,PERS.PersonNumber,E.ExtraPersonId,E.Diabetes,E.BloodPressure

FROM  
ExtraPerson E  
INNER JOIN Person PERS  
ON PERS.PersonId=E.PersonId  



WHERE E.CampId=@CampId AND ReferencePatientId=@ReferencePatientId AND E.IsDeleted = 0
END

现在jqGrid正常工作,除了分页.例如：如果它有15条记录,第一页显示10条记录,剩下的是第二页,但我不能去.
任何人都可以建议我,如何为jqgrid做分页？

解决方法

如果使用SQL Server 2012,则可以在ORDER BY之后使用OFFSET和FETCH来实现分页(请参阅here).在这种情况下,SQL语句看起来非常接近使用OFFSET和LIMIT的相应MySQL或PostgreSQL语句.顺便说一下,Microsoft Entity Framework使用Entity SQL Language具有紧密结构(SKIP和LIMIT).如果您使用SQL Server 2012或更高版本,可能OFFSET和FETCH将是首选方式.

因为您在问题中包含SQL Server 2008标记,所以我不会在我的答案中使用新的SQL Server 2012结构.

另一个好方法是使用sp_executesql,它允许您将SQL语句构造为带参数的字符串.它允许重用执行计划,这对于最佳性能非常重要.该方法允许您扩展STORED PROCEDURE的代码以实现服务器端过滤(搜索).

我看到需要在SQL语句中实现包含返回数据的ID(在您的情况下为PersonId)的分页.所以我决定建议你使用SELECT TOP结合LEFT OUTER JOIN的简化方法.

您存储的过程dbo.GetExtraPerson可以有两个类型为int的附加参数：@skip和@pageSize.如果@skip等于0,则STORED PROCEDURE可以执行

SELECT TOP (@pageSize) PERS.PersonId,E.BloodPressure
FROM ExtraPerson E  
    INNER JOIN Person PERS ON PERS.PersonId=E.PersonId  
WHERE E.CampId=@CampId AND ReferencePatientId=@ReferencePatientId AND E.IsDeleted=0

如果@skip不等于0,则相应的SQL语句可以如下

WITH GetAll AS (
    SELECT PERS.PersonId,E.BloodPressure
    FROM ExtraPerson E  
        INNER JOIN Person PERS ON PERS.PersonId=E.PersonId  
    WHERE E.CampId=@CampId AND ReferencePatientId=@ReferencePatientId AND E.IsDeleted=0
),GetFirst AS (
    SELECT TOP (@skip) *
    FROM GetAll
    ORDER BY Name
),GetNext AS (
    SELECT TOP (@pageSize) a.*
    FROM GetAll AS a
        LEFT OUTER JOIN GetFirst AS f ON f.Id=a.Id
    WHERE f.Id IS NULL
    ORDER BY Name
)
SELECT * FROM GetNext

dbo.GetExtraPerson的完整代码可以是以下内容

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO

ALTER PROCEDURE dbo.GetExtraPerson 
    @CampId int,@ReferencePatientId bigint,@skip int,@pageSize int
AS
BEGIN
    DECLARE @records int;
    SET NOCOUNT ON;

    SET @records = (SELECT COUNT(*)
                    FROM ExtraPerson E  
                        INNER JOIN Person PERS ON PERS.PersonId=E.PersonId  
                    WHERE E.CampId=@CampId
                        AND ReferencePatientId=@ReferencePatientId
                        AND E.IsDeleted=0);

    IF @skip <= 0
        SELECT TOP (@pageSize) PERS.PersonId,E.BloodPressure
        FROM ExtraPerson E  
            INNER JOIN Person PERS ON PERS.PersonId=E.PersonId  
        WHERE E.CampId=@CampId AND ReferencePatientId=@ReferencePatientId
            AND E.IsDeleted=0
    ELSE
        WITH GetAll AS (
            SELECT PERS.PersonId,E.BloodPressure
            FROM ExtraPerson E  
                INNER JOIN Person PERS ON PERS.PersonId=E.PersonId  
            WHERE E.CampId=@CampId AND ReferencePatientId=@ReferencePatientId
                AND E.IsDeleted=0
        ),GetFirst AS (
            SELECT TOP (@skip) *
            FROM GetAll
            ORDER BY Name
        ),GetNext AS (
            SELECT TOP (@pageSize) a.*
            FROM GetAll AS a
                LEFT OUTER JOIN GetFirst AS f ON f.Id=a.Id
            WHERE f.Id IS NULL
            ORDER BY Name
        )
        SELECT * FROM GetNext;

    RETURN @records;
END
GO

上述过程另外返回记录总数,您可以使用它来分配totalRecords值.

如果将上述代码与sp_executesql结合使用,则可以轻松修改代码以在所有SELECT TOP语句中包含ORDER BY,以便返回的值与jqGrid中用户请求的排序顺序相对应.

（编辑：李大同）

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