Update xml string values.

Question

Hi,
I'm on 11.2.0.2 and got table with nclob column which stores long xml string .
{code}
"<?xml version="1.0" encoding="UTF-8"?>
<?fuego version="6.5.2" build="101272"?>
<set>
<configuration name="TEST Database" type="SQL" subtype="DDORACLE">
  <property name="jdbc.pool.idle_timeout" value="5"/>
  <property name="jdbc.pool.entry.max" value="10"/>
  <property name="oracle.dateEqualsTimestamp" value="false"/>
  <property name="jdbc.schema" value="user1"/>
  <property name="jdbc.host" value="hostname"/>
  <property name="user" value="user1"/>
  <property name="jdbc.port" value="1521"/>
  <property name="jdbc.pool.min" value="0"/>
  <property name="jdbc.pool.maxopencursors" value="50"/>
  <property name="oracle.sid" value="dbsid"/>
  <property name="password" value="user101"/>
  <property name="jdbc.xa" value="false"/>
  <property name="jdbc.pool.max" value="10"/>
</configuration>
<configuration name="TEST Database2" type="SQL" subtype="DDORACLE">
  <property name="jdbc.pool.idle_timeout" value="5"/>
  <property name="jdbc.pool.entry.max" value="10"/>
  <property name="oracle.dateEqualsTimestamp" value="false"/>
  <property name="jdbc.schema" value="user2"/>
  <property name="jdbc.host" value="hostname"/>
  <property name="user" value="user2"/>
  <property name="jdbc.port" value="1521"/>
  <property name="jdbc.pool.min" value="0"/>
  <property name="jdbc.pool.maxopencursors" value="50"/>
  <property name="oracle.sid" value="dbsid2"/>
  <property name="password" value="user201"/>
  <property name="jdbc.xa" value="false"/>
  <property name="jdbc.pool.max" value="10"/>
</configuration>
</set>
{code}
My goal is to update password value in such way that it equals to value from jdbc.schema value  <property name="jdbc.schema" value="user2"/>   so in this case user2 || '01'
<property name="password" value="user201"/>   <-- that is my goal .
Regards
Greg

Answer 1

Hi,
You can find a few methods here : How To : Update XML nodes with values from the same document | Odie's Oracle Blog
They're not all applicable to your version and settings though.
Here's the first one applied to your case :
declare
  v_xmldoc   xmltype;
begin
  select xmlparse(document to_clob(t.xmldoc))
  into v_xmldoc
  from my_nclob_table t
  where t.id = 1;
  for r in (
    select idx, schema_name
    from my_nclob_table t
       , xmltable(
           '/set/configuration'
           passing v_xmldoc
           columns idx         for ordinality
                 , schema_name varchar2(30) path 'property[@name="jdbc.schema"]/@value'
  loop
    select updatexml(
             v_xmldoc
           , '/set/configuration['||to_char(r.idx)||']/property[@name="password"]/@value'
           , r.schema_name || '01'
    into v_xmldoc
    from dual ;
  end loop;
  update my_nclob_table t
  set t.xmldoc = to_nclob(xmlserialize(document v_xmldoc indent))
  where t.id = 1;
end;
Here's another one, using DOM :
declare
  doc   clob;
  p        dbms_xmlparser.Parser;
  domdoc   dbms_xmldom.DOMDocument;
  docnode  dbms_xmldom.DOMNode;
  conf_list      dbms_xmldom.DOMNodeList;
  conf_node      dbms_xmldom.DOMNode;
  password_node  dbms_xmldom.DOMNode;
  schema_name     varchar2(30);
  password_value  varchar2(256);
begin
  select to_clob(xmldoc)
  into doc
  from my_nclob_table
  where id = 1 ;
  p := dbms_xmlparser.newParser;
  dbms_xmlparser.parseClob(p, doc);
  domdoc := dbms_xmlparser.getDocument(p);
  dbms_xmlparser.freeParser(p);
  docnode := dbms_xmldom.makeNode(domdoc);
  conf_list := dbms_xslprocessor.selectNodes(docnode, '/set/configuration');
  for i in 0 .. dbms_xmldom.getLength(conf_list) - 1 loop
    conf_node := dbms_xmldom.item(conf_list, i);
    dbms_xslprocessor.valueOf(conf_node, 'property[@name="jdbc.schema"]/@value', schema_name);
    password_node := dbms_xslprocessor.selectSingleNode(conf_node, 'property[@name="password"]/@value');
    dbms_xmldom.setNodeValue(password_node, schema_name || '01');
  end loop;
  dbms_xmldom.writeToClob(domdoc, doc);
  dbms_xmldom.freeDocument(domdoc);
  update my_nclob_table t
  set t.xmldoc = to_nclob(doc)
  where t.id = 1;
end;
Message was edited by: odie_63 - added DOM example