快速介紹如何使用oracle xml數據類型

Question

如何使用oracle XML數據類型？

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Answer 1

下面的示例SQL演示瞭如何插入，包含XMLTYPE數據類型的查詢和更新數據庫字段：

-- Create a table that can store XML 
create table sample_xml (id number, xml xmltype); 

-- Insert some XML into the table 
insert into sample_xml values (1, xmltype.createxml('<subject><name>test</name><list><li>a</li><li>b</li></list></subject>')); 
insert into sample_xml values (2, xmltype.createxml('<subject><name>test</name><list><li>a</li></list></subject>')); 

-- When doing a select, refer to table using the alias or getClobVal() will not work 
select t.id, t.xml.getClobVal() from sample_xml t; 

-- Update text of a single xml element 
UPDATE sample_xml SET xml = UPDATEXML(xml, '/subject/name/text()','happy') WHERE id = 2; 

-- Select out just the name for each row in the table using xpath 
select id, extractvalue(xml, '/subject/name/text()') from sample_xml; 

-- Doing an sample_xml, where the xpath string matches two elements, the text of both elements will be updated 
UPDATE sample_xml SET xml = UPDATEXML(xml, '/subject/list/li/text()','one');