DataGrid串連Access的快速分頁法(3)——SQL語句的選用(降序)

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access|datagrid|分頁|語句 DataGrid串連Access的快速分頁法(3)——SQL語句的選用(降序)
三、降序
(1)@PageIndex <= @FirstIndex
SELECT TOP @PageSize @QueryFields
FROM @TableName
WHERE @Condition
ORDER BY @PrimaryKey DESC


(2)@FirstIndex < @PageIndex <= @MiddleIndex

SELECT TOP @PageSize @QueryFields
FROM @TableName
WHERE @PrimaryKey < (
SELECT MIN(@PrimaryKey) FROM (
SELECT TOP @PageSize*@PageIndex @PrimaryKey
FROM @TableName
WHERE @Condition
ORDER BY @PrimaryKey DESC
) TableA
) WHERE @Condition
ORDER BY @PrimaryKey DESC



(3)@MiddleIndex < @PageIndex < @LastIndex

SELECT * FROM (
SELECT TOP @PageSize @QueryFields
FROM @TableName
WHERE @PrimaryKey > (
SELECT MAX(@PrimaryKey) FROM (
SELECT TOP (@RecordCount-@PageSize*(@PageIndex+1)) @PrimaryKey
FROM @TableName
WHERE @Condition
-- ORDER BY @PrimaryKey ASC
) TableA
) WHERE @Condition
-- ORDER BY @PrimaryKey ASC
) TableB
ORDER BY @PrimaryKey DESC



(4)@PageIndex >= @LastIndex

SELECT * FROM (
SELECT TOP (@RecordCount-@PageSize*@LastIndex) @QueryFields
FROM @TableName
WHERE @Condition
ORDER BY @PrimaryKey ASC
) TableA
ORDER BY @PrimaryKey DESC

四、總結
通過上面的討論,相信大家應該看到了該分頁方法的優勢所在。在下一篇中,我將給大家一個動態產生上面 SQL 陳述式的類。



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