Question

这里我有一个从XML中提取费率的代码：

BSchema

此代码的结果为

with tbl as
(
    select
        XMLType(
        '<exchange_rates>
            <rate units="1" code="AUD">2.6</rate>
            <rate units="1" code="THB">0.1</rate>
            <rate units="1" code="BRL">0.9</rate>
            <rate units="1" code="BGN">2.2</rate>
            <rate units="1" code="CAD">2.9</rate>
            <rate units="100" code="CLP">0.5</rate>
        </exchange_rates>'
        ) xml
    from
        t_temp
)
select
    extractValue(value(t), 'rate') result
from
    tbl t,
    table(XMLSequence(t.xml.extract('//rate'))) t;

可以，但是我也想获取属性值并得到如下结果：

RESULT
------
2.6
0.9
2.2
2.9
0.5

有办法吗？

Answer 1

Oracle的XML函数采用XPath表达式，因此您将使用@ attributename 语法来标识属性。另外，您可以使用XMLTABLE函数使结构更容易/更清晰。

with tbl as
(
    select
        XMLType(
        '<exchange_rates>
            <rate units="1" code="AUD">2.6</rate>
            <rate units="1" code="THB">0.1</rate>
            <rate units="1" code="BRL">0.9</rate>
            <rate units="1" code="BGN">2.2</rate>
            <rate units="1" code="CAD">2.9</rate>
            <rate units="100" code="CLP">0.5</rate>
        </exchange_rates>'
        ) xmldata
    from
        dual
)
select units, code, rate
from   tbl,
       xmltable('/exchange_rates/rate' 
                      PASSING tbl.xmldata 
                      COLUMNS rate NUMBER PATH '.', 
                              code VARCHAR2(3) PATH './@code', 
                              units NUMBER PATH './@units');

+-------+------+------+
| UNITS | CODE | RATE |
+-------+------+------+
|     1 | AUD  |  2.6 |
|     1 | THB  |  0.1 |
|     1 | BRL  |  0.9 |
|     1 | BGN  |  2.2 |
|     1 | CAD  |  2.9 |
|   100 | CLP  |  0.5 |
+-------+------+------+

如何使用ORACLE解析XML中的属性值

1 个答案: