在asp.net中使用存储过程自定义动态分页

Question

CREATE PROCEDURE [dbo].[sp_GetPageWiseData]
(
    @tableName sysname,
    @orderColumn nvarchar(100),
    @PageIndex INT = 1,
    @PageSize INT = 10,
    @RecordCount varchar(10) OUTPUT
)
AS
BEGIN
SET NOCOUNT ON;
DECLARE @query varchar(2000),
        @minimumIndex varchar(5),
        @maximumIndex varchar(5)

SET @minimumIndex=convert(varchar,(@PageIndex - 1) * @PageSize + 1)
SET @maximumIndex=convert(varchar,@PageIndex * @PageSize)

SET @query='SELECT ROW_NUMBER() OVER(ORDER BY ' + @orderColumn + ' ASC)AS RowNumber,* INTO #Results FROM ' + @tableName + ';
            SELECT ' + @RecordCount + '=COUNT(*) FROM #Results;
            SELECT * FROM #Results WHERE RowNumber BETWEEN ' + @minimumIndex + ' AND ' + @maximumIndex + ';
            DROP TABLE #Results'
Exec (@query)   
END

问题是当程序执行时，输出参数

@RecordCount

显示NULL值。

为什么？

请解释一下。 谢谢

Answer 1

您的查询必须是这样的：

SET @query='SELECT ROW_NUMBER() OVER(ORDER BY ' + @orderColumn + ' ASC)AS RowNumber,* INTO #Results FROM ' + @tableName + ';
        SELECT  @RecordCount =COUNT(*) FROM #Results;
        SELECT * FROM #Results WHERE RowNumber BETWEEN ' + @minimumIndex + ' AND ' + @maximumIndex + ';
        DROP TABLE #Results';

但是这里系统会要求你声明变量，@RecordCount

所以你可以通过从查询中返回 2 个数据集来做到这一点；

SET @query='DECLARE @RecordCount varchar(10); SELECT ROW_NUMBER() OVER(ORDER BY ' + @orderColumn + ' ASC)AS RowNumber,* INTO #Results FROM ' + @tableName + ';
        SELECT  @RecordCount =COUNT(*) FROM #Results;
        SELECT * FROM #Results WHERE RowNumber BETWEEN ' + @minimumIndex + ' AND ' + @maximumIndex + ';
        SELECT @RecordCount AS TOTALRECORDS;
        DROP TABLE #Results';

Answer 2

我认为你不能这样使用它。这就像串联而不是赋值方法。我认为你应该分两步处理，如下所示：

SET @query='SELECT ROW_NUMBER() OVER(ORDER BY ' + @orderColumn + ' ASC)AS RowNumber,* INTO #Results FROM ' + @tableName + ';'

Exec (@query)

SELECT @RecordCount =COUNT(*) FROM #Results

SET @query='SELECT * FROM #Results WHERE RowNumber BETWEEN ' + @minimumIndex + ' AND ' + @maximumIndex + ';
DROP TABLE #Results'

Exec (@query)