sql - getting name and value from xmltype attribute in oracle -

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description

hello, have problem extracting attribute names , values xmltype value in oracle. basically, have table, let's tablea, has xmltype column, let's call tablea_config. values in tablea_config have structure this: <tableaconfig someattribute1="value1" someattribute2="value2" someattribute3="value3" />. number of attributes , names may vary , not known beforehand. need (for each row) create new xmlelement called tableaconfiglist, contains xmlelements called tableaconfig , each of has 2 attributes: name , value. now, number of tableaconfig nodes must equal number of attributes in tablea_config column, , each holds name of corresponding attribute in name attribute , value in value attribute.

example

from:

<tableaconfig someattribute1="value1" someattribute2="value2" someattribute3="value3" />

i should get:

<tableaconfiglist>     <tableaconfig name="someattribute1" value="value1"/>     <tableaconfig name="someattribute2" value="value2"/>     <tableaconfig name="someattribute3" value="value3"/> </tableaconfiglist>

what tried

i came idea create xmltable tablea_config column value , in create 2 columns, can later select. looks (it fragment of bigger query):

select xmlelement("tableaconfiglist",     (select         xmlagg(            xmlelement("tableaconfig",                 xmlattributes(                     tmp."attr_name" "name",                     tmp."attr_text" "value"                 )             )         ) xmltable('/tableaconfig/@*'             passing tablea.tablea_config             columns                "attr_name" varchar(30) path 'name()',                "attr_text" varchar(30) path 'text()'         ) tmp     ) ) dual

but get:

<tableaconfiglist>     <tableaconfig name="someattribute1"></tableaconfig>     <tableaconfig name="someattribute2"></tableaconfig>     <tableaconfig name="someattribute3"></tableaconfig> </tableaconfiglist>

there no value. however, if remove name xmlattributes shows up. from:

select xmlelement("tableaconfiglist",     (select         xmlagg(            xmlelement("tableaconfig",                 xmlattributes(                     tmp."attr_text" "value"                 )             )         ) xmltable('/tableaconfig/@*'             passing tablea.tablea_config             columns                "attr_name" varchar(30) path 'name()',                "attr_text" varchar(30) path 'text()'         ) tmp     ) ) dual

i get:

<tableaconfiglist>     <tableaconfig value="value1"></tableaconfig>     <tableaconfig value="value2"></tableaconfig>     <tableaconfig value="value3"></tableaconfig> </tableaconfiglist>

i thought maybe, reason, there can 1 attribute created way, if add new 1 hardcoding it, shows in result, this:

select xmlelement("tableaconfiglist",     (select         xmlagg(            xmlelement("tableaconfig",                 xmlattributes(                     tmp."attr_text" "value",                     'testvalue' "testattribute"                 )             )         ) xmltable('/tableaconfig/@*'             passing tablea.tablea_config             columns                "attr_name" varchar(30) path 'name()',                "attr_text" varchar(30) path 'text()'         ) tmp     ) ) dual

result:

<tableaconfiglist>     <tableaconfig value="value1" testattribute="testvalue"></tableaconfig>     <tableaconfig value="value2" testattribute="testvalue"></tableaconfig>     <tableaconfig value="value3" testattribute="testvalue"></tableaconfig> </tableaconfiglist>

putting in xmlattributes both columns , hardcoded 1 gives me name , testattribute, no value.

could tell me because miss terribly obvious, bug or doing wrong. pretty new oracle , pl/sql , appreciate help. thanks!

you there first attempt. while evaluating xpath, when inside attribute list /tableaconfig/@*, don't need text() value of attribute inside it. @ attribute level using "dot" . current node sufficient.

so try - 

select xmlelement("tableaconfiglist",     (select         xmlagg(            xmlelement("tableaconfig",                 xmlattributes(                     tmp."attr_name" "name",                     tmp."attr_text" "value"                 )             )         ) xmltable('/tableaconfig/@*'             passing tablea.tablea_config             columns                "attr_name" varchar(30) path 'name()',                "attr_text" varchar(30) path '.'         ) tmp     ) ) dual

the difference first attempt xpath of value attribute.


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