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我有一个使用 Oracle 开发的查询。我想更新同一列

'5次。在我开发的查询下方：

MERGE INTO product pr 
USING(
SELECT pr.uuid,
            xmltype(pr.attributes_de_de).extract('//attr[@name = "SellingPoint1"]/string/text()')  AS sellingpoint1,
            xmltype(pr.attributes_de_de).extract('//attr[@name = "SellingPoint2"]/string/text()')  AS sellingpoint2,
            xmltype(pr.attributes_de_de).extract('//attr[@name = "SellingPoint3"]/string/text()')  AS sellingpoint3,
            xmltype(pr.attributes_de_de).extract('//attr[@name = "SellingPoint4"]/string/text()')  AS sellingpoint4,
            xmltype(pr.attributes_de_de).extract('//attr[@name = "SellingPoint5"]/string/text()')  AS sellingpoint5
  FROM product pr WHERE pr.defaultproductvariationid ='1tap_vEBvuEAAAE89CgjnPbb' AND pr.typecode = '16'
) defaultproducts ON (pr.uuid = '8d2p_vEBCJgAAAE8ruYjnPba')
WHEN MATCHED THEN 
UPDATE SET pr.attributes_de_de = CASE WHEN sellingpoint1 IS NOT NULL THEN
                                  CASE WHEN (SELECT count(1) existscount FROM product pr 
                                              WHERE pr.uuid = '8d2p_vEBCJgAAAE8ruYjnPba' 
                                              AND existsNode(xmltype(pr.attributes_de_de), '/attrs/attr[@name="SellingPoint1"]') = 1) = 1 
                                        THEN 
                                  UPDATEXML(XMLTYPE.createXML(pr.attributes_de_de),'/attrs/attr[@name = "SellingPoint1"]/string/text()', 
                                                    sellingpoint1).getClobVal() 
                                        ELSE 
                                  APPENDCHILDXML(xmltype(pr.attributes_de_de), 'attrs/attr[@name="SellingPoint22"]',
                                                    XMLType('<string>test</string>')).getClobVal()
                                        END  
                                    ELSE 
                                  DELETEXML(xmltype(pr.attributes_de_de), '/attrs/attr[@name="SellingPoint1"]').getClobVal()  
                                END
DELETE where pr.uuid != '8d2p_vEBCJgAAAE8ruYjnPba'

此查询中的挑战是“pr.attribute_de_de”列应更新为 sellpoint1、sellingpoint2、sellingpoint3、sellingpoint4、sellingpoint5。如何在 oracle 中做到这一点。非常感谢您的任何建议

4

2 回答 2

2

您不需要循环，因为 Oracle updateXML 函数可用于在单个 SQL UPDATE 语句中的多个节点上用新值替换现有元素、属性和其他节点。 

...    
UPDATE SET pr.attributes_de_de = updateXML(pr.attributes_de_de, '/attrs/attr[@name = "SellingPoint1"]/string/text()', 'NewVal_SellingPoint1',  
                                                                '/attrs/attr[@name = "SellingPoint2"]/string/text()', 'NewVal_SellingPoint2',  
                                                                '/attrs/attr[@name = "SellingPoint3"]/string/text()', 'NewVal_SellingPoint3')  
...

查看有关XMLtype 操作的 Oracle 文档。

于 2013-02-22T04:31:46.373 回答
0

我认为您的“USING”查询中需要五行。UNION 会起作用吗？说，像这样：

MERGE INTO product pr 
USING(
  SELECT pr.uuid, xmltype(pr.attributes_de_de).extract('//attr[@name = "SellingPoint1"]/string/text()') as sellingpoint,
  UNION ALL SELECT pr.uuid, xmltype(pr.attributes_de_de).extract('//attr[@name = "SellingPoint2"]/string/text()'),
  UNION ALL SELECT pr.uuid, xmltype(pr.attributes_de_de).extract('//attr[@name = "SellingPoint3"]/string/text()'),
  UNION ALL SELECT pr.uuid, xmltype(pr.attributes_de_de).extract('//attr[@name = "SellingPoint4"]/string/text()'),
  UNION ALL SELECT pr.uuid, xmltype(pr.attributes_de_de).extract('//attr[@name = "SellingPoint5"]/string/text()')
) defaultproducts ...

...然后是查询的其余部分，但使用“卖点”而不是“卖点 1”、“卖点 2”等。

注意 UNION ALL 而不是 UNION：普通的 UNION（没有 ALL）将消除重复的行。我假设您每次都需要五行，无论是否重复。

希望这至少是朝着正确方向的推动。我在处理 XML 查询时都睡眼惺忪 :)

于 2013-02-22T00:52:16.370 回答