功能介绍

为了兼容Oracle数据库的语法，LightDB24.1版本开始支持XMLELEMENT函数省略NAME关键字，功能不受影响。

使用示例

1. 带有NAME关键字

lightdb@oracle_test=# SELECT xmlelement(name foo);xmlelement 
------------<foo/>
(1 row)lightdb@oracle_test=# 
lightdb@oracle_test=# SELECT xmlelement(name foo, xmlattributes('xyz' as bar));xmlelement    
------------------<foo bar="xyz"/>
(1 row)lightdb@oracle_test=# SELECT xmlelement(name foo, xmlattributes(current_date as bar), 'cont', 'ent');xmlelement              
-------------------------------------<foo bar="2024-03-06">content</foo>
(1 row)lightdb@oracle_test=# 

2. 省略NAME关键字

lightdb@oracle_test=# SELECT xmlelement(foo);xmlelement 
------------<foo/>
(1 row)lightdb@oracle_test=# SELECT xmlelement(foo, xmlattributes('xyz' as bar));xmlelement    
------------------<foo bar="xyz"/>
(1 row)lightdb@oracle_test=# SELECT xmlelement(foo, xmlattributes(current_date as bar), 'cont', 'ent');xmlelement              
-------------------------------------<foo bar="2024-03-06">content</foo>
(1 row)lightdb@oracle_test=#