我想通过将它连接到一个条件表来找到一种方法来对XML字符串进行接受/拒绝。我现在有一个“过滤器”正在工作,但是要编写它以便可以过滤2个或更多。t-sql:在多个条件下动态过滤XML?
下面是与两者中的一个匹配的代码。如果两者匹配,则会过滤字符串。 我想要做的就是它,所以它必须同时匹配,同时还留下了选择单条件
CREATE TABLE #filter (exclusion_type CHAR(1), excluded_value varchar(10))
INSERT INTO #filter VALUES ('B','boy')
INSERT INTO #filter VALUES ('C','cat')
DECLARE @data XML
SELECT @data = '<A><B>boy</B><C>cat</C></A>'
SELECT * FROM (SELECT CONVERT(VARCHAR(128),node.query('fn:local-name(.)')) AS NodeName, CONVERT(VARCHAR(MAX),node.query('./text()')) AS NodeValue
FROM @data.nodes(N'//*') T(node))xml_shred
IF NOT EXISTS
(SELECT * FROM (SELECT CONVERT(VARCHAR(128),node.query('fn:local-name(.)')) AS NodeName, CONVERT(VARCHAR(MAX),node.query('./text()')) AS NodeValue
FROM @data.nodes(N'//*') T(node)) xml_shred
INNER JOIN #filter
ON (nodename = exclusion_type AND nodevalue LIKE excluded_value)
)
select 'record would be inserted '
ELSE select 'record was filtered'
这里是我现在怎么把它过滤两种。丑陋,不可扩展。
IF NOT EXISTS
(SELECT * FROM (SELECT CONVERT(VARCHAR(128),node.query('fn:local-name(.)')) AS NodeName, CONVERT(VARCHAR(MAX),node.query('./text()')) AS NodeValue
FROM @data.nodes(N'//*') T(node)) xml_shred
INNER JOIN #filter
ON (nodename = exclusion_type AND nodevalue LIKE excluded_value)
)
--combination filters don't easily work within that xml_shred
and not(
@data.value('(/A/B)[1]', 'varchar(128)') = 'boy'
AND
@data.value('(/A/C)[1]', 'varchar(128)')='cat'
)
select 'record would be inserted '
ELSE select 'record was filtered'
我唯一的其他想法:
- 某种GUID的,将在#filter表链接记录在一起,然后内部联接上的#filtertable一个GROUP BY,由GUID和分组使用SUM来匹配记录的数量。
- 使用分号分割#filter行,然后使用CTE或某物来伪造层次结构并从那里开始工作。
通过的Mikael的建议
CREATE TABLE #filter
(
exclusion_set SMALLINT,
exclusion_type CHAR(1) ,
excluded_value VARCHAR(10)
)
INSERT INTO #filter
VALUES (1, 'B', 'boy')
INSERT INTO #filter
VALUES (1, 'C', 'cat')
INSERT INTO #filter
VALUES (2, 'D', 'dog')
DECLARE @data XML
SELECT @data = '<A><B>boy</B><C>cat</C></A>'
IF NOT EXISTS(
SELECT * FROM
(
select COUNT(*) AS match_count, exclusion_set
from #filter as F
where exists (
select *
from (
select X.N.value('local-name(.)', 'varchar(128)') as NodeName,
X.N.value('./text()[1]', 'varchar(max)') as NodeValue
from @data.nodes('//*') as X(N)
) T
where T.NodeName = F.exclusion_type and
T.NodeValue like F.excluded_value
)
GROUP BY exclusion_set
) matches_per_set
INNER JOIN
(SELECT COUNT(*) AS total_count, exclusion_set FROM #filter GROUP BY exclusion_set) grouped_set
ON match_count = total_count
AND grouped_set.exclusion_set = matches_per_set.exclusion_set
)
权,但是,只有当有永远只能匹配的记录工作。第二个我添加了一组不同的条件(通过向#filter添加行),它失败了。但是,这段代码与我的GUID想法相吻合...... – mbourgon
我在做的node.query与你正在做的X.N.value之间的性能有很大的区别吗?我不知道XML查询足够了解。猜猜我可以对付我的A/B。 – mbourgon
如何从另一组过滤器中指出一组过滤器? –