Required complicated updateXML

Hello

First of All, I'll apologize in advance one) the stupidity of bits of the obligation that I am trying to solve (you'll know 'em when you see em!) and b) if I accidentally simplify my example.

The requirements that I work with are not yet completely hammered, but I think I have to go down the route of what is, essentially, an update of several nodes in an xmltype column (stored as a CLOB; we're on 10.2.0.4) based on the question whether the node has one matching row in another table. Oh, and it comes to slot in an existing, dynamic piece of SQL in a PL/SQL procedure massively too complicated. Oh, the joy in my life... (kill me now?)

In any case, here is a very simplified version of the query that the result is that I need to change (xdata is the xmldata column I am interested in the update):

Select..., sd.xdata...

FROM table1 t1,

sample_data sd,

....

where sd.id2 = t1.id

and...;

When we store the data in the table sample_data, I intend to remove the data in the rep_node nodes (which there is usually only one node, but it turns out that there may also be several knots, and they may contain different values) in a separate table extracted_data with one ordered column pk in the sample_data table (id1). I can't outer join these values with the matching_table to get the new_value, which is what I have to sort out as part of the query (I can not update the column xdata with this information in the table, that may change the data in the matching_table, so everything must be done in the query).

This is the query, I came up with that:

with sample_data as (select 1 id1, 10 id2, xmltype ("< a > < c > 1 </c > < d > < e > 2 < /e > < rep_node > 3 < / rep_node > < f > < g > < rep_node > 4 < / rep_node > < / g > < h > < rep_node > 5 < / rep_node > < / h > < / > < f / d")) (> < / a > ') xdata Union double all the

Select id1, id2 10 2, xmltype ("<> < d > < k > 1 < /k > < l > 2 </l >/< day > < m > < rep_node > 3 < / rep_node > < n > 4/< n > < / m > < / has > '") double xdata) ,

extracted_data as (select sd.id1, x.*)

of sample_data sd,.

XMLTable ('/ / rep_node' in passing sd.xdata)

columns for the ordinalite RN,

rep_node_val path number '.') (x),

match_data as (select 3 old_val, 30 new_val of all the double union)

Select 5 old_val, 50 double new_val)

Select sd.*,

Ed.RN,

Ed.rep_node_val,

MD.*

of sample_data sd,.

extracted_data ed,

match_data md

where ed.rep_node_val = md.old_val (+)

and sd.id1 = ed.id1;

As you can see on the example above, the rep_node does not always appear in the same place, and I do not know XPath expressions it can appear in, which makes this super fun to work with * rolls eyes *.

The problem is, now, I have several lines with each line in the table sample_data with several rep_nodes. How the hell I that sink down in a line, as well as update the xdata column to show the corresponding new_value in the nodes of rep_node?

for example. in the example above

original: < a > < c > 1 </c > < d > < e > 2 < /e >< rep_node > 3 < / rep_node >< f > < g >< rep_node > 4 < / rep_node ></g > < h >< rep_node > 5 < / rep_node >< HR > < / f > < / d > < / has >

Wanted: < a > < c > 1 </c > < d > < e > 2 < /e >< rep_node > 30 < / rep_node >< f > < g >< rep_node > 4 < / rep_node ></g > < h >< rep_node > 50 < / rep_node >< HR > < / f > < / d > < / has >

original: <> < d > < k > 1 < /k > < l > 2 </l >/< day > < m>< rep_node > 3 < / rep_node >< n > 4/< n > < / m > < / has >

Wanted: <> < d > < k > 1 < /k > < l > 2 </l >/< day > < m>< rep_node > 30 < / rep_node >< n > 4/< n > < / m > < / has >

Of course, the dynamic sql is the extra complication here; We use the immediate execution, so I 32767octets to play with in the query (10g * {:-(), so I need to use the amount the less extra characters to get this new logic inserted in the original code * sigh *.

Is it still possible? Is my intended address issues unique complications? Someone at - it smart ideas on how do the pivoting of the lines into a single line, and then update the xdata column at the same time somehow?

Thanks in advance! * fingers crossed *.

Hello

It's a scenario that I have already met several times.

A typical requirement was last updated from an input XML document, the compilation of data from the table with the new PK values of their respective orders. So, I had to deal with a mapping table.

Fortunately enough I was on 11.2 so much more useful features XML by hand on 10g to do the job, such as the update of XQuery or XMLPatch.

10.2.0.4, I think the following should work (only tested on 11.2), it generates a style sheet XSLT describing the change to be performed on the XML of entry and apply on the fly for each line:

SQL > with sample_data like)

2 Select 1 id1, id2 10, xdata xmltype ("12345") of all the double union

3 select 2 id1, id2 10, xdata xmltype ("1234") of the double

4 ),

5 extracted_data as)

6. Select sd.id1

7, appendchildxml)

8 xmltype ('http://www.w3.org/1999/XSL/Transform ">")

14 ')

15 , '/*'

16, xmlagg)

17 xmlelement ("xsl: template")

18, xmlattributes)

19'http://www.w3.org/1999/XSL/Transform"as" xmlns: xsl ""

20, ' rep_node / text () [. ='| to_char (x.rep_node_val) |'] ' as a 'match '.

21 )

22, md.new_val

23 )

24 )

(25) stylesheet

sample_data sd 26

27, xmltable ('/ / rep_node' in passing sd.xdata)

RN 28 columns for ordinalite

29 number of rep_node_val road '.'

(30) x

31 join match_data on md.old_val = x.rep_node_val md

Group 32 by sd.id1

33)

34 select sd.id1

35, xmltransform (sd.xdata, ed.stylesheet) as new_xdata

36 of extracted_data ed

Join 37 sample_data sd on sd.id1 = ed.id1

38;

ID1 NEW_XDATA

---------- --------------------------------------------------------------------------------

2

30

4

50

2

30

4

This solution is very talkative, so he can't go well with your request size constraint.

If you can accept the creation of a function, I advise to use this instead:

create or replace function update_xml)

p_xmldata in xmltype

p_xpath in varchar2

)

return of xmltype

is

result of xmltype: = p_xmldata;

domdoc dbms_xmldom. DOMDocument;

DomNode dbms_xmldom. DOMNode;

NL dbms_xmldom. DOMNodeList;

o_val match_data.old_val%type;

n_val match_data.new_val%type;

Start

domdoc: = dbms_xmldom.newDOMDocument (result);

NL: = dbms_xslprocessor.selectNodes (dbms_xmldom.makeNode (domdoc), p_xpath);

for i from 0... dbms_xmldom.GetLength (NL) - 1 loop

DOMNode: = dbms_xmldom.item(nl, i);

o_val: = to_number (dbms_xmldom.getNodeValue (domnode));

Start

Select new_val

in n_val

of match_data

where old_val = o_val;

dbms_xmldom.setNodeValue (domnode, n_val);

exception

When no_data_found then

null;

end;

end loop;

dbms_xmldom.freeDocument (domdoc);

return the result;

end;

/

then:

SQL > with sample_data like)

2 Select 1 id1, id2 10, xdata xmltype ("12345") of all the double union

3 select 2 id1, id2 10, xdata xmltype ("1234") of the double

4)

5. Select id1

update_xml 6 (xdata, '//rep_node/text ()') as new_xdata

sample_data 7;

ID1 NEW_XDATA

---------- --------------------------------------------------------------------------------

1

1

2

30

4

50

2

1

2

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