从 CLOB 中提取 XML 数据

Question

如何从数据中提取 Food ItemID 和 Food Item Name and Quantity，如下所述。这是在 plsql 的 clob 列中。

<ServiceDetails>
    <FoodItemDetails>
        <FoodItem FoodItemID="6486" FoodItemName="CARROT" Quantity="2" Comments="" ServingQuantityID="142" ServingQuantityName="SMALL GLASS" FoodItemPrice="50" ItemDishPriceID="5336" CurrencyName="INR" Currency Id="43"/>
    </FoodItemDetails>
    <BillOption>
        <Bill Details Total Price="22222" BillOption="cash"/>
    </BillOption>
    <Authoritativeness/>
</Service Details>

Answer 1

使用xmltable。

数据设置：

create table myt(
col1 clob
);

insert into myt values('<ServiceDetails>
    <FoodItemDetails>
        <FoodItem FoodItemID="6486" FoodItemName="CARROT" Quantity="2" Comments="" ServingQuantityID="142" ServingQuantityName="SMALL GLASS" FoodItemPrice="50" ItemDishPriceID="5336" CurrencyName="INR" CurrencyId="43"/>
    </FoodItemDetails>
    <BillOption>
        <BillDetails TotalPrice="22222" BillOption="cash"/>
    </BillOption>
    <Authoritativeness/>
</ServiceDetails>'
);

commit;

查询：

select cols.*
from myt
cross join xmltable('ServiceDetails/FoodItemDetails/FoodItem' passing xmltype(col1)
            columns fooditemid varchar2(10) path '@FoodItemID',
                fooditemname varchar2(20) path '@FoodItemName'
        ) cols;

结果：

FOODITEMID FOODITEMNAME
---------- --------------------
6486       CARROT