SQL Server 2008 FOR XML PATH帮助

Question

我有一个历史记录表。一个字段[添加]具有日期时间数据类型。我想要做的是选择一个用户最近的记录，然后将它们从[added]字段派生出来的字符串进行分组。说它的值是2011-05-24 03:32:57.353，字符串是'Tuesday, May 24, 2011'。我想按该字符串对记录进行分组，但是按实际时间排序子节点。我也想要一些自定义的XML输出。

<ActivityHistory> 
    <Actvities foo="Tuesday, May 24, 2011"> 
     <Activity id="10000" bar="zoo" bam="2011-05-24 03:32:57.353" /> 
     <Activity id="10001" bar="zoo" bam="2011-05-24 03:31:57.353" /> 
     <Activity id="10002" bar="zoo" bam="2011-05-24 03:28:57.353" /> 
     <Activity id="10003" bar="zoo" bam="2011-05-24 03:21:57.353" /> 
    </Activities> 
    <Actvities foo="Monday, May 23, 2011"> 
     <Activity id="9990" bar="zoo" bam="2011-05-23 03:32:57.353" /> 
     <Activity id="9989" bar="zoo" bam="2011-05-23 03:31:57.353" /> 
     <Activity id="9988" bar="zoo" bam="2011-05-23 03:28:57.353" /> 
     <Activity id="9987" bar="zoo" bam="2011-05-23 03:21:57.353" /> 
    </Activities> 
    <Actvities foo="Sunday, May 22, 2011"> 
     <Activity id="9900" bar="zoo" bam="2011-05-22 03:32:57.353" /> 
     <Activity id="9899" bar="zoo" bam="2011-05-22 03:31:57.353" /> 
     <Activity id="9898" bar="zoo" bam="2011-05-22 03:28:57.353" /> 
     <Activity id="9897" bar="zoo" bam="2011-05-22 03:21:57.353" /> 
    </Activities> 
</ActivityHistory> 

该有效载荷总是只有0-20条记录。可能它总是20.

到目前为止我的查询看起来像这样。

SELECT TOP 20 
    fnHistoryGroupingText(Added) [@foo]   
    FROM ActivityHistory 
WHERE MricId = 1 
GROUP BY fnHistoryGroupingText(Added) 
FOR XML PATH ('Activities'), ROOT ('ActivityHistory') 

它生成类似于我所寻找的XML。

<ActivityHistory> 
    <Activities foo="Friday, May 20, 2011" /> 
    <Activities foo="Monday, May 23, 2011" /> 
    <Activities foo="Saturday, May 21, 2011" /> 
    <Activities foo="Sunday, May 22, 2011" /> 
    <Activities foo="Tuesday, May 24, 2011" /> 
</ActivityHistory> 

请注意，它不是日期排序和缺乏子节点。我希望他们按逆时间顺序排序。我故意排除查询中的某些字段，因为在查询中，我正在获取最终想要的结构。当我介绍其他领域时，XML就没有了。对文本进行分组是一种varchar，不会很好地转换为日期。我可以以某种方式使用[added]字段，但是当我将它包含在查询中时，它会破坏我的分组。任何人都可以指出我正确的方向来纠正这些问题吗？ [A]正确编写查询，并[B]告诉我如何正确输出我正在寻找的XML。

Answer 1

试试这个：

/* INIT */ 
DECLARE @ActivityHistory TABLE (id int, bar VARCHAR(3), bam datetime) 
INSERT INTO @ActivityHistory 
      SELECT id='10000', bar='zoo', bam='2011-05-24 03:32:57' 
     UNION SELECT id='10001', bar='zoo', bam='2011-05-24 03:31:57' 
     UNION SELECT id='10002', bar='zoo', bam='2011-05-24 03:28:57' 
     UNION SELECT id='10003', bar='zoo', bam='2011-05-24 03:21:57' 
     UNION SELECT id= '9990', bar='zoo', bam='2011-05-23 03:32:57' 
     UNION SELECT id= '9989', bar='zoo', bam='2011-05-23 03:31:57' 
     UNION SELECT id= '9988', bar='zoo', bam='2011-05-23 03:28:57' 
     UNION SELECT id= '9987', bar='zoo', bam='2011-05-23 03:21:57' 
     UNION SELECT id= '9900', bar='zoo', bam='2011-05-22 03:32:57' 
     UNION SELECT id= '9899', bar='zoo', bam='2011-05-22 03:31:57' 
     UNION SELECT id= '9898', bar='zoo', bam='2011-05-22 03:28:57' 
     UNION SELECT id= '9897', bar='zoo', bam='2011-05-22 03:21:57' 

/* QUERY */ 
;WITH 
resALL AS (SELECT * 
     , foo = DATENAME(weekday, bam)+', '+ CONVERT(VARCHAR(30), bam, 107) 
     , food = CONVERT(VARCHAR(10), bam, 121) 
    FROM @ActivityHistory AS Activity 
) 
, resD AS (SELECT DISTINCT foo, food FROM resALL 
) 

SELECT 
Activities.foo 
, (
    SELECT id, bar, bam 
    FROM resALL AS Activity 
    WHERE foo = Activities.foo 
    ORDER BY bam desc 
    FOR XML AUTO, TYPE 
    ) 
FROM resD AS Activities 
ORDER BY Activities.food DESC 
FOR XML AUTO, TYPE, ROOT ('ActivityHistory') 

/* OUTPUT 
<ActivityHistory> 
    <Activities foo="Tuesday, May 24, 2011"> 
    <Activity id="10000" bar="zoo" bam="2011-05-24T03:32:57" /> 
    <Activity id="10001" bar="zoo" bam="2011-05-24T03:31:57" /> 
    <Activity id="10002" bar="zoo" bam="2011-05-24T03:28:57" /> 
    <Activity id="10003" bar="zoo" bam="2011-05-24T03:21:57" /> 
    </Activities> 
    <Activities foo="Monday, May 23, 2011"> 
    <Activity id="9990" bar="zoo" bam="2011-05-23T03:32:57" /> 
    <Activity id="9989" bar="zoo" bam="2011-05-23T03:31:57" /> 
    <Activity id="9988" bar="zoo" bam="2011-05-23T03:28:57" /> 
    <Activity id="9987" bar="zoo" bam="2011-05-23T03:21:57" /> 
    </Activities> 
    <Activities foo="Sunday, May 22, 2011"> 
    <Activity id="9900" bar="zoo" bam="2011-05-22T03:32:57" /> 
    <Activity id="9899" bar="zoo" bam="2011-05-22T03:31:57" /> 
    <Activity id="9898" bar="zoo" bam="2011-05-22T03:28:57" /> 
    <Activity id="9897" bar="zoo" bam="2011-05-22T03:21:57" /> 
    </Activities> 
</ActivityHistory> 
*/