Generating XML from SQL queries and saving to an xml file?

Hi there,
I was wondering if somebody could help with regards to the following:
Generating XML from SQL queries and saving to a xml file?
We want to have a procedure(PL/SQL) that accepts an order number as an input parameter(the procedure
is accessed by our software on the client machine).
Using this order number we do a couple of SQL queries.
My first question: What would be our best option to convert the result of the
queries to xml?
Second Question: Once the XML has been generated, how do we save that XML to a file?
(The XML file is going to be saved on the file system of the server that
the database is running on.)
Now our procedure will also have a output parameter which returns the filename to us. eg. Order1001.xml
Our software on the client machine will then ftp this XML file(based on the output parameter[filename]) to
the client hard drive.
Any information would be greatly appreciated.
Thanking you,
Francois

If you are using 9iR2 you do not need to do any of this..
You can create an XML as an XMLType using the new SQL/XML operators. You can insert this XML into the XML DB repository using DBMS_XDB.createResource. You can then access the document from the resource. You can also return the XMLType containing the XML directly from the PL/SQL Procedure.

Similar Messages

Generating XML from SQL queries and saving to a xml file?

Hi there,
I was wondering if somebody could help with regards to the following:
Generating XML from SQL queries and saving to a xml file?
We want to have a stored procedure(PL/SQL) that accepts an order number as an input parameter(the procedure
is accessed by our software on the client machine).
Using this order number we do a couple of SQL queries.
My first question: What would be our best option to convert the result of the
queries to xml?
Second Question: Once the XML has been generated, how do we save that XML to a file?
(The XML file is going to be saved on the file system of the server that
the database is running on.)
Now our procedure will also have a output parameter which returns the filename to us. eg. Order1001.xml
Our software on the client machine will then ftp this XML file(based on the output parameter[filename]) to
the client hard drive.
Any information would be greatly appreciated.
Thanking you,
Francois

Hi
Here is an example of some code that i am using on Oracle 817.
The create_file procedure is the one that creates the file.
The orher procedures are utility procedures that can be used with any XML file.
PROCEDURE create_file_with_root(po_xmldoc OUT xmldom.DOMDocument,
pi_root_tag IN VARCHAR2,
                                        po_root_element OUT xmldom.domelement,
                                        po_root_node OUT xmldom.domnode,
                                        pi_doctype_url IN VARCHAR2) IS
xmldoc xmldom.DOMDocument;
root xmldom.domnode;
root_node xmldom.domnode;
root_element xmldom.domelement;
record_node xmldom.domnode;
newelenode xmldom.DOMNode;
BEGIN
xmldoc := xmldom.newDOMDocument;
xmldom.setVersion(xmldoc, '1.0');
xmldom.setDoctype(xmldoc, pi_root_tag, pi_doctype_url,'');
-- Create the root --
root := xmldom.makeNode(xmldoc);
-- Create the root element in the file --
create_element_and_append(xmldoc, pi_root_tag, root, root_element, root_node);
po_xmldoc := xmldoc;
po_root_node := root_node;
po_root_element := root_element;
END create_file_with_root;
PROCEDURE create_element_and_append(pi_xmldoc IN OUT xmldom.DOMDocument,
pi_element_name IN VARCHAR2,
                                        pi_parent_node IN xmldom.domnode,
                                        po_new_element OUT xmldom.domelement,
                                        po_new_node OUT xmldom.domnode) IS
element xmldom.domelement;
child_node xmldom.domnode;
newelenode xmldom.DOMNode;
BEGIN
element := xmldom.createElement(pi_xmldoc, pi_element_name);
child_node := xmldom.makeNode(element);
-- Append the new node to the parent --
newelenode := xmldom.appendchild(pi_parent_node, child_node);
po_new_node := child_node;
po_new_element := element;
END create_element_and_append;
FUNCTION create_text_element(pio_xmldoc IN OUT xmldom.DOMDocument, pi_element_name IN VARCHAR2,
pi_element_data IN VARCHAR2, pi_parent_node IN xmldom.domnode) RETURN xmldom.domnode IS
parent_node xmldom.domnode;
child_node xmldom.domnode;
child_element xmldom.domelement;
newelenode xmldom.DOMNode;
textele xmldom.DOMText;
compnode xmldom.DOMNode;
BEGIN
create_element_and_append(pio_xmldoc, pi_element_name, pi_parent_node, child_element, child_node);
parent_node := child_node;
-- Create a text node --
textele := xmldom.createTextNode(pio_xmldoc, pi_element_data);
child_node := xmldom.makeNode(textele);
-- Link the text node to the new node --
compnode := xmldom.appendChild(parent_node, child_node);
RETURN newelenode;
END create_text_element;
PROCEDURE create_file IS
xmldoc xmldom.DOMDocument;
root_node xmldom.domnode;
xml_doctype xmldom.DOMDocumentType;
root_element xmldom.domelement;
record_element xmldom.domelement;
record_node xmldom.domnode;
parent_node xmldom.domnode;
child_node xmldom.domnode;
newelenode xmldom.DOMNode;
textele xmldom.DOMText;
compnode xmldom.DOMNode;
BEGIN
xmldoc := xmldom.newDOMDocument;
xmldom.setVersion(xmldoc, '1.0');
create_file_with_root(xmldoc, 'root', root_element, root_node, 'test.dtd');
xmldom.setAttribute(root_element, 'interface_type', 'EXCHANGE_RATES');
-- Create the record element in the file --
create_element_and_append(xmldoc, 'record', root_node, record_element, record_node);
parent_node := create_text_element(xmldoc, 'title', 'Mr', record_node);
parent_node := create_text_element(xmldoc, 'name', 'Joe', record_node);
parent_node := create_text_element(xmldoc,'surname', 'Blogs', record_node);
-- Create the record element in the file --
create_element_and_append(xmldoc, 'record', root_node, record_element, record_node);
parent_node := create_text_element(xmldoc, 'title', 'Mrs', record_node);
parent_node := create_text_element(xmldoc, 'name', 'A', record_node);
parent_node := create_text_element(xmldoc, 'surname', 'B', record_node);
-- write the newly created dom document into the buffer assuming it is less than 32K
xmldom.writeTofile(xmldoc, 'c:\laiki\willow_data\test.xml');
EXCEPTION
WHEN xmldom.INDEX_SIZE_ERR THEN
RAISE_APPLICATION_ERROR(-20120, 'Index Size error');
WHEN xmldom.DOMSTRING_SIZE_ERR THEN
RAISE_APPLICATION_ERROR(-20120, 'String Size error');
WHEN xmldom.HIERARCHY_REQUEST_ERR THEN
RAISE_APPLICATION_ERROR(-20120, 'Hierarchy request error');
WHEN xmldom.WRONG_DOCUMENT_ERR THEN
RAISE_APPLICATION_ERROR(-20120, 'Wrong doc error');
WHEN xmldom.INVALID_CHARACTER_ERR THEN
RAISE_APPLICATION_ERROR(-20120, 'Invalid Char error');
WHEN xmldom.NO_DATA_ALLOWED_ERR THEN
RAISE_APPLICATION_ERROR(-20120, 'Nod data allowed error');
WHEN xmldom.NO_MODIFICATION_ALLOWED_ERR THEN
RAISE_APPLICATION_ERROR(-20120, 'No mod allowed error');
WHEN xmldom.NOT_FOUND_ERR THEN
RAISE_APPLICATION_ERROR(-20120, 'Not found error');
WHEN xmldom.NOT_SUPPORTED_ERR THEN
RAISE_APPLICATION_ERROR(-20120, 'Not supported error');
WHEN xmldom.INUSE_ATTRIBUTE_ERR THEN
RAISE_APPLICATION_ERROR(-20120, 'In use attr error');
WHEN OTHERS THEN
dbms_output.put_line('exception occured' || SQLCODE || SUBSTR(SQLERRM, 1, 100));
END create_file;

Why it's so inefficient to generate XML from SQL queries?

I am learning to use Oracle9i XML DB to generate XML document using SQL queries. According to the document, there are multiple ways to do it (SQLX, DBMS_XMLGEN, SYS_XMLGEN, XSU). I am using SQLX to do it, but find it's so inefficient. Could someone point out what could be the problem?
I generate XML from TPC-H database, using the query as shown below. The indexes and primary key/foreign keys are created and specified. The system is Pentium IV 2GHz, Linux 2.4.18 with 512MB memory and 1GB swap. With database size 5MB, it spends about 300 seconds (TKPROF result) to generate the XML document. But for 10MB TPCH database, I cannot get the xml document after a long time. I find that all almost physical memory are used up by it. Therefore I stop it.
It seems that nested-loop join is used to evaluate the query, therefore it's very inefficient. I don't know whether there is a efficient way to do it.
Wish to get your help. Thank you very much!
Chengkai Li
===================================================================================================================
SELECT XMLELEMENT (
"region",
XMLATTRIBUTES ( r_regionkey AS "regionkey", r_name AS "name", r_comment AS "comment"),
(SELECT XMLAGG(
XMLELEMENT (
"nation",
XMLATTRIBUTES ( n_nationkey AS "nationkey", n_name AS "name", n_regionkey AS "regionkey", n_comment AS "comment"),
XMLConcat ((SELECT XMLAGG(XMLELEMENT (
"supplier",
XMLATTRIBUTES ( s_suppkey AS "suppkey", s_name AS "name", s_address AS "address", s_nationkey AS "nationkey", s_phone AS "phone", s_acctbal AS "acctbal", s_comment AS "comment"),
(SELECT XMLAGG(XMLELEMENT (
"part",
XMLATTRIBUTES ( p_partkey AS "partkey", p_name AS "name", p_mfgr AS "mfgr", p_brand AS "brand", p_type AS "type", p_size AS "size", p_container AS "container", p_retailprice AS "retailprice", p_comment AS "comment", ps_availqty AS "ps_availqty", ps_supplycost AS "ps_supplycost", ps_comment AS "ps_comment")))
FROM PART p, PARTSUPP ps
WHERE ps.ps_partkey = p.p_partkey
AND ps.ps_suppkey = s.s_suppkey
FROM SUPPLIER s
WHERE s.s_nationkey = n.n_nationkey
(SELECT XMLAGG(XMLELEMENT(
"customer",
XMLATTRIBUTES ( c_custkey AS "custkey", c_name AS "name", c_address AS "address", c_nationkey AS "nationkey", c_phone AS "phone", c_acctbal AS "acctbal", c_mktsegment AS "mktsegment", c_comment AS "comment"),
(SELECT XMLAGG(XMLELEMENT (
"orders",
XMLATTRIBUTES ( o_orderkey AS "orderkey", o_custkey AS "custkey", o_orderstatus AS "orderstatus", o_totalprice AS "totalprice", o_orderdate AS "orderdate", o_orderpriority AS "orderpriority", o_clerk AS "clerk", o_shippriority AS "shippriority", o_comment AS "ps_comment"),
(SELECT XMLAGG(XMLELEMENT (
"lineitem",
XMLATTRIBUTES ( l_orderkey AS "orderkey", l_partkey AS "partkey", l_suppkey AS "suppkey", l_linenumber AS "linenumber", l_quantity AS "quantity", l_extendedprice AS "extendedprice", l_discount AS "discount", l_tax AS "tax", l_returnflag AS "returnflag", l_linestatus AS "linestatus", l_shipdate AS "shipdate", l_commitdate AS "commitdate", l_receiptdate AS "receiptdate", l_shipinstruct AS "shipinstruct", l_shipmode AS "shipmode", l_comment AS "comment")
FROM LINEITEM l
WHERE l.l_orderkey = o.o_orderkey
FROM ORDERS o
WHERE o.o_custkey = c.c_custkey
FROM CUSTOMER c
WHERE c.c_nationkey = n.n_nationkey
FROM NATION n
WHERE n.n_regionkey = r.r_regionkey
FROM REGION r;

Tim,
Oracle Reports was the orginal way to do this in an Oracle Apps environment. However, the XML Publisher team built a tool called data templates to do this as well. You can read several articles on how to use data templates on the XMLP blog. Here's the first arcticle in a series: http://blogs.oracle.com/xmlpublisher/2006/11/08#a127.
Bryan

How to generate XML from SQL query

possible ways to generate XML from SQL qury.
i want to generate XML of following query. "Select * from emp,dep wher emp.deptno=dept.deptno"

Hello.
Can you try:
SQL> set pages 0
SQL> set linesize 150
SQL> set long 9999999
SQL> set head off
SQL> select dbms_xmlgen.getxml('Select * from emp,dep wher emp.deptno=dept.deptno') from dual;
It works fine for me.
Octavio

Generate XML from SQL

Hi I wan to create XML from SQL using XMLElement and XMLAttribute as per below Format
*<field name="AccountNumber">TEST01</field>*
is it possible?
Thanks in advance
waiting for yours positive reply

Parth Panjabi wrote:
Thanks in AdvanceWhy don't you open Oracle docs and read it. If you want to beautify, XMLSerialize supports INDENT:
SQL> SELECT XMLSerialize(document
2           XMLElement("ROWS",
3             XMLAgg(
4               XMLElement("ROW",
5                 XMLElement("field",
6                   XMLAttributes('AccountNumber' AS "name")
7                 , ename
8                 )
9               , XMLElement("field",
10                   XMLAttributes('CBAccountNumber' AS "name")
11                 , null
12                 )
13               )
14             )
15           )
16         )
17 FROM EMP
18 WHERE deptno = 10
19 /
XMLSERIALIZE(DOCUMENTXMLELEMENT("ROWS",XMLAGG(XMLELEMENT("ROW",XMLELEMENT("FIELD
<ROWS><ROW><field name="AccountNumber">CLARK</field><field name="CBAccountNumber
"></field></ROW><ROW><field name="AccountNumber">KING</field><field name="CBAcco
untNumber"></field></ROW><ROW><field name="AccountNumber">MILLER</field><field n
ame="CBAccountNumber"></field></ROW></ROWS>
SQL> SELECT XMLSerialize(document
2           XMLElement("ROWS",
3             XMLAgg(
4               XMLElement("ROW",
5                 XMLElement("field",
6                   XMLAttributes('AccountNumber' AS "name")
7                 , ename
8                 )
9               , XMLElement("field",
10                   XMLAttributes('CBAccountNumber' AS "name")
11                 , null
12                 )
13               )
14             )
15           )
16          INDENT
17         )
18 FROM EMP
19 WHERE deptno = 10
20 /
XMLSERIALIZE(DOCUMENTXMLELEMENT("ROWS",XMLAGG(XMLELEMENT("ROW",XMLELEMENT("FIELD
<ROWS>
<ROW>
    <field name="AccountNumber">CLARK</field>
    <field name="CBAccountNumber"/>
</ROW>
<ROW>
    <field name="AccountNumber">KING</field>
    <field name="CBAccountNumber"/>
</ROW>
<ROW>
    <field name="AccountNumber">MILLER</field>
XMLSERIALIZE(DOCUMENTXMLELEMENT("ROWS",XMLAGG(XMLELEMENT("ROW",XMLELEMENT("FIELD
    <field name="CBAccountNumber"/>
</ROW>
</ROWS>
SQL>
{code}
SY.

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<MSG_LAW_WR_CRE_UPD ID = "WMIS-4744" SRC_SYSTEM_CODE = "WMIS" SRC_SYSTEM_INSTANCE = "WMIS">
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<DATETIME>12/19/2005</DATETIME>
<RUSCODE>100</RUSCODE>
<WRNO>38213</WRNO>
</CMP_LAW_WR_CRE_UPD>
</MSG_LAW_WR_CRE_UPD>'),'//DATETIME/text()') FROM DUAL;
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Generating XML from SQL queries and saving to an xml file?

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