DataGrid连接Access的快速分页法（3）——SQL语句的选

DataGrid连接Access的快速分页法（3）——SQL语句的选用（降序）

三、降序

（1）@PageIndex <= @FirstIndexSELECT TOP @PageSize @QueryFields FROM @TableName WHERE @ConditionORDER 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、总结

通过上面的讨论，相信大家应该看到了该分页方法的优势所在。在下一篇中，我将给大家一个动态生成上面 SQL 语句的类。 作者：黎波