Convert XMLTYPE to VARCHAR2 or CLOB?

Does anyone know how to convert an XMLTYPE variable to VARCHAR2 or CLOB? I am using the XMLELEMENT function to select XML into an XMLTYPE variable (VARCHAR2 and CLOB will not accept xml from this function). But I would like to convert the xml in the XMLTYPE variable to VARCHAR2 or CLOB. Can anyone please tell me how to do this? The reason is that I would like to call this procedure from MS ADO.
Anthony Sneed
email: [email protected]

Hi,
But I would like to convert the xml in the XMLTYPE variable to VARCHAR2 or CLOB.You can select XMLType data using PL/SQL or Java. You can also use the getClobVal(), getStringVal(), or getNumberVal() functions to retrieve XML as a CLOB, VARCHAR, or NUMBER, respectively.
Example 4-18 Selecting XMLType Columns using getClobVal()
This example shows how to select an XMLType column using SQL*Plus:
SET long 2000
SELECT e.poDoc.getClobval() AS poXML
FROM po_xml_tab e;
POXML
<?xml version="1.0"?>
<PO pono="2">
<PNAME>Po_2</PNAME>
<CUSTNAME>Nance</CUSTNAME>
<SHIPADDR>
<STREET>2 Avocet Drive</STREET>
<CITY>Redwood Shores</CITY>
<STATE>CA</STATE>
</SHIPADDR>
</PO>
Look into the documentation: Oracle9i XML Database Developer's Guide - Oracle XML DB for more details.
Hope that helps.
OTN team@IDC

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          WHERE_QUERY VARCHAR2(200);
          fileDirectory VARCHAR2(100);
          slashPosition NUMBER;
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{ desc tab1;
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Hi,
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v_clob CLOB;
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Notice: Undefined index: DATA_DEFAULT in /opt/lampp/htdocs/datamodel/index.php on line 64
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ORA-00932: inconsistent datatypes: expected LONG got CHAR
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G.

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select to_nchar(ename) from temp_ajay
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or
select to_char(ename) from temp_ajay
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select to_char(ename) from temp_ajayx;Message was edited by:
Jameel

Treating xmltype as varchar2

Hi people,
I'm using DBD::Oracle perl module to access data in Oracle Database. the database characterset is WE8MSWIN1252 and my data are utf8 encoded in an xmltype.
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How can get an utf8 encoded value with this query in sqlplus :
select xmlbody from tableA;
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Note I would STRONGLY recommend converting the database characater set to AL32UTF8 if at all possible.... Bad things will happen if you end up with an UTF8 characater that cannot be represented in the database characater set.

How to create index on a xmltype column stored as CLOB

actually i have two problems.
i uploaded this schemaA.xsd file into xmldb repository without problems. registration also went ok.
BEGIN
DBMS_XMLSCHEMA.registerSchema(
schemaURL => 'http://xmlns.example.com/xdb/documentation/schemaA.xsd'
,schemaDoc => sys.UriFactory.getUri('/home/dev/schemaA.xsd')
,local => TRUE
,genBean => false
,genTypes => TRUE
,genTables => false
,enableHierarchy => DBMS_XMLSCHEMA.ENABLE_HIERARCHY_NONE
END;
then i run this:
create table pf_table_a(
     id VARCHAR2(100) primary key,
     xsd VARCHAR2(3000),
xml_document XMLType
) XMLTYPE COLUMN xml_document
STORE AS CLOB
XMLSCHEMA "http://xmlns.example.com/xdb/documentation/schemaA.xsd"
ELEMENT "order";
and got this error:
SQL> @d:\usr\dev\perftest\create_tables.sql
Table created.
create table pf_table_a(
ERROR at line 1:
ORA-00955: name is already used by an existing object
anyway the table was created. so i went on to create indexes.
SQL> create index pf_a_index on pf_table_a(extractValue(OBJECT_VALUE, '/order@or
derNo'));
create index pf_a_index on pf_table_a(extractValue(OBJECT_VALUE, '/order@orderNo
ERROR at line 1:
ORA-04063: table "BAUSER1.PF_TABLE_A" has errors
this of course is wrong. because the command is for creating index of a XMLTYPE table. no a column. but what is the correct command? thanks.
jack.

actually i have two problems.
i uploaded this schemaA.xsd file into xmldb repository without problems. registration also went ok.
BEGIN
DBMS_XMLSCHEMA.registerSchema(
schemaURL => 'http://xmlns.example.com/xdb/documentation/schemaA.xsd'
,schemaDoc => sys.UriFactory.getUri('/home/dev/schemaA.xsd')
,local => TRUE
,genBean => false
,genTypes => TRUE
,genTables => false
,enableHierarchy => DBMS_XMLSCHEMA.ENABLE_HIERARCHY_NONE
END;
then i run this:
create table pf_table_a(
     id VARCHAR2(100) primary key,
     xsd VARCHAR2(3000),
xml_document XMLType
) XMLTYPE COLUMN xml_document
STORE AS CLOB
XMLSCHEMA "http://xmlns.example.com/xdb/documentation/schemaA.xsd"
ELEMENT "order";
and got this error:
SQL> @d:\usr\dev\perftest\create_tables.sql
Table created.
create table pf_table_a(
ERROR at line 1:
ORA-00955: name is already used by an existing object
anyway the table was created. so i went on to create indexes.
SQL> create index pf_a_index on pf_table_a(extractValue(OBJECT_VALUE, '/order@or
derNo'));
create index pf_a_index on pf_table_a(extractValue(OBJECT_VALUE, '/order@orderNo
ERROR at line 1:
ORA-04063: table "BAUSER1.PF_TABLE_A" has errors
this of course is wrong. because the command is for creating index of a XMLTYPE table. no a column. but what is the correct command? thanks.
jack.

Varchar2 to CLOB

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I want to convert my Varchar2 vairable to CLOB to store in my database is that any way to do so ?
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Regards,
Nishith Pancholi

Hi!
Here's a quick example for you:
create table tmpl (f1 number, f2 clob);
declare
l_clob clob;
l_str varchar2(32767) := 'asdf';
begin
insert into tmpl values (1, l_str);
end;
select * from tmpl;
drop table tmpl;
Regards,
Andrew Velitchko
BrainBench MVP for Developer/2000
http://www.brainbench.com

PL/SQL Solution for Converting Long to VarChar2

I recently had to convert a bunch of text stored in Long fields to a new VarChar2(2000) field in the same table.
As you know if you've ever tried, you can't use a basic SQL the update statement will not do this, e.g. update table1 set field2 = field1 (where field2 is VarChar(2000) and field1 is Long) fails as does update table1 set field2 = substr(field1, 1, 2000).
Interestingly PL/SQL's implementation of SubStr does work with Long fields. I was able to put together the following anonymous PL./SQL block to accomplish the task (msgtext is varchar(2000), msgtext2 is Long):
DECLARE
CURSOR message_cur
IS
SELECT ROWID, msgtext, msgtext2
FROM tlrcmmessages
FOR UPDATE;
message_rec message_cur%ROWTYPE;
BEGIN
OPEN message_cur;
LOOP
FETCH message_cur
INTO message_rec;
EXIT WHEN message_cur%NOTFOUND;
UPDATE tlrcmmessages
SET msgtext = SUBSTR(message_rec.msgtext2, 1, 2000)
WHERE CURRENT OF message_cur;
END LOOP;
CLOSE message_cur;
END;
I hopes this helps others out there in similar circumstances.
Good luck,
Rob Bratton, Bratton Enterprises

Oracle strongly recommends to convert LONG fields into CLOB:
http://download-west.oracle.com/docs/cd/B10501_01/appdev.920/a96590/adfnstyp.htm#429091
Rgds.

Varchar2 to CLOB : Best Options to do it ?

Helllo,
I have a table whcih is 20GB in size and has a Column which is a Varchar2 column.As varchar2 could store upto 4000 bytes of data,we have a requiremnet where the column can have more than 4000 bytes of data and we decided to convert it to a CLOB column.
What are the best and fastest way of doing this?
OPTION 1_
1. First create the temporary table
CREATE TABLE P_C_V_NEW
(TESTID_NUM NUMBER,
DATAPOINT NUMBER,
DATAPOINT_DATE DATE ,
CHANGE_FLAG VARCHAR2(1),
CHANNEL_VALUES CLOB )
2. Insert the data from original to the temporaray table
INSERT INTO P_C_V_NEW (SELECT TESTID_NUM,DATAPOINT, DATAPOINT_DATE, CHANGE_FLAG,CHANNEL_VALUES FROM P_C_V)
3.Rename the temporary table to Original table
RENAME P_C_V_NEW TO PAM_CHANNEL_VALUES
OPTION 2:_
SQL> alter table P_C_V add (NEW_CHANNEL_VALUE clob);
Table altered.
SQL> update P_C_V set NEW_CHANNEL_VALUE = CHANNEL_VALUE;
1 row updated.
SQL> alter table PP_C_V drop column CHANNEL_VALUE;
Table altered.
SQL> alter table P_C_V rename column NEW_CHANNEL_VALUE to CHANNEL_VALUE;
Table altered.
SQL> desc pam_channel_values
Name Null? Type
TESTID_NUM NUMBER
DATAPOINT      NOT NULL NUMBER
DATAPOINT_DATE      NOT NULL DATE
CHANGE_FLAG      NOT NULL CHAR(1)
CHANNEL_VALUES CLOB
OPTION 3
Use DBMS_REDEFINITION ?
This original table contains 11714457 records.
Thanks
GAG

I would prefer somthing as like method1 as
Create table x as select * from old table.
beacuse it would be the fastest way to load the data compare to update of method 2.
Only issue is that the in table x the new constriant and index need to be created if they are presenti on old .
and even if you want to go with method 2 you need to do the update in BULK collect way in plsql
not simple sql like this beacuse you need a big amount of rollback segment spac
update P_C_V set NEW_CHANNEL_VALUE = CHANNEL_VALUE;Cheers
Nawneet

The most effective way from varchar2 to CLOB?

this is my table's TAB structure on Oracle 10g r2:
TAB_ID (PK),
TAB2_ID (FK constraint to TAB2(TAB2_ID), index created),
TEXT varchar2(4000)
What is the most effective way to convert varchar2(4000) column to CLOB column?
1. create new table TAB_NEW with column TEXT as CLOB,
then insert /*+ APPEND */ into TAB_NEW SELECT * FROM TAB,
then rename table TAB to TAB_OLD,
then drop constraint and indexes
then rename TAB_new to TAB
then add constraints primary key and foreign key,
then add index on TAB2_ID
then drop table TAB_OLD
OR
2. rename column TEXT(varchar2) to TEXT_OLD
then add column TEXT(type CLOB)
then update(how the most effective?) TAB set TEXT=TEXT_OLD
drop column TEXT_OLD.

1 will work, as you can assign a VARCHAR2 to a CLOB and Oracle will convert it.
2 is redundant.
Sybrand Bakker
Senior Oracle DBA

Question in ER_DESIGN with VARCHAR2 and CLOB

hi experts,
i want to know in your design experience, how do you manage thus situation:
a text field, which must have features of full-text search for all the text, normally, it should be less than 4000 character long, (it means we can use varchar2 field for it),
however, sometimes it should longer than 4000 characters.
i think, i could have two options,
the first, i cut it into peices with no one can be longer than 4000, nevertheless, this method will face difficult to provide full-text search.
the other is to build a new table with clob field, the original table will involve a field of varchar2, the other field of number will be a reference guild the the clob table.
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so i can provide full-text search functions for this type of record, and much storage space can be saved.
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thank you very much.
frederick

No, I don't have tables of values. I have a java 1.5 enumeration, like for instance:
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}and a class Velocity that contains a convention and a value like so:
public class Velocity {
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I want to have a selectOneMenu for setting the convention. Via trial and error, I found that MyFaces wasn't able to automatically convert from a string back to a proper VelocityConvention enum constant. It can, of course, convert from the enum to a string because it just calls toString(). But I need both directions for any UIInput element I use, be it a selectOne, or just a straight inputText.

Convert result of query to CLOB

Hi,
I have a query which is 'execute immediate vc_query into vcl_result'. Here vc_query is a varchar2 which is holding my query and return some value, And vc_result is a CLOB.
Now, this statement is failing to execute and saying inconsistent datatypes.
Is there a way I can convert the result of the sql query in the variable to convert to clob?
Thanks,

Yes and no. It depends.
a) why are you using execute immediate to execute a query?
b) why do you want the results stored in a CLOB?
c) what structure should the results have in the CLOB?
d) read the FAQ: Re: 2. How do I ask a question on the forums? and post sufficient details so people can answer you properly.

Convert XMLTYPE to VARCHAR2 or CLOB?

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