如何在多个条件下过滤XML字段

时间:2014-01-09 15:42:16

标签: sql sql-server xml sql-server-2012 cross-apply

我有一张桌子:

CREATE TABLE MyTable(
    Id [int] IDENTITY(1,1) NOT NULL,
    XmlField xml NULL,
    /// Some other fields
)

XML字段包含C#Dictionary<int, string>的XML表示。例如:

<dictionary>
    <item>
        <key><int>1</int></key>
        <value><string>Web</string></value>
    </item>
    <item>
        <key><int>2</int></key>
        <value><string>Email</string></value>
    </item>
    // more item
</dictionary>

我想要做的是选择XmlField包含的所有行(key = 1,value ='Web'),并且还包含(key = 2,value ='Email')。

到目前为止,我只设法过滤1个唯一键/值匹配的行:

SELECT TableId, XmlField FROM MyTable
CROSS APPLY XmlField.nodes('/dictionary/item') x(fields)
WHERE (x.fields.value('(key/int/text())[1]', 'int') = 1 
AND x.fields.value('(value/string/text())[1]', 'varchar(MAX)') = 'Web')

如果我添加AND (x.fields.value('(key/int/text())[1]', 'int') = 2 AND x.fields.value('(value/string/text())[1]', 'varchar(MAX)') = 'Email'),则不会返回任何内容(非常符合逻辑)。

我也尝试过不使用CROSS APPLY并做一个简单的过滤器:

SELECT TableId, XmlField FROM MyTable
WHERE XmlField.exist('/dictionary/item/key/int[text() = 1]') = 1
AND XmlField.exist('/dictionary/item/value/string[text() = "Web"]') = 1

然后它就像一个OR,并返回xml包含2个键值对的行,如(1,Email)和(2,Web)

1 个答案:

答案 0 :(得分:3)

这样的事情应该这样做。

select *
from MyTable as T
where T.XmlField.exist('/dictionary[item[key/int/text() = 1 and value/string/text() = "Web"] and   
                                    item[key/int/text() = 2 and value/string/text() = "Email"]]') = 1