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Extracting Multiple Resultsets from a DataReader

2006-10-13 18:01 399 查看
// read the first resultset
reader = command.ExecuteReader();

// read the data from that resultset
while (reader.Read()) {
suppliers.Add(PopulateSupplierFromIDataReader( reader ));
}

// read the next resultset
reader.NextResult();

// read the data from that second resultset
while (reader.Read()) {
products.Add(PopulateProductFromIDataReader( reader ));
}

Figure 2 Paging Through the Orders Table
CREATE PROCEDURE northwind_OrdersPaged
(
@PageIndex int,
@PageSize int
)
AS
BEGIN
DECLARE @PageLowerBound int
DECLARE @PageUpperBound int
DECLARE @RowsToReturn int

-- First set the rowcount
SET @RowsToReturn = @PageSize * (@PageIndex + 1)
SET ROWCOUNT @RowsToReturn

-- Set the page bounds
SET @PageLowerBound = @PageSize * @PageIndex
SET @PageUpperBound = @PageLowerBound + @PageSize + 1

-- Create a temp table to store the select results
CREATE TABLE #PageIndex
(
IndexId int IDENTITY (1, 1) NOT NULL,
OrderID int
)

-- Insert into the temp table
INSERT INTO #PageIndex (OrderID)
SELECT
OrderID
FROM
Orders
ORDER BY
OrderID DESC

-- Return total count
SELECT COUNT(OrderID) FROM Orders

-- Return paged results
SELECT
O.*
FROM
Orders O,
#PageIndex PageIndex
WHERE
O.OrderID = PageIndex.OrderID AND
PageIndex.IndexID > @PageLowerBound AND
PageIndex.IndexID < @PageUpperBound
ORDER BY
PageIndex.IndexID

END
 
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标签:  table insert null
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