XML file data loading using EXTERNAL TABLE

Today we will learn about how to use the external table to load the xml data file .

Before going to for the steps lets discuss about
What is External Table ?

An external table is database object in which table structure and definition are stored inside the Oracle but the data as the name suggest reside outside the oracle .
  The External table enable us to access the external data and  as data segments not gets stored  in oracle we can not create any index,update the records and delete the records  external table  .

Here are the steps the access the xml file in oracle:
Sample File : Open a notepad type the below code and save as tab_friends.xml  which is used in this article

<?xml version="1.0" encoding="UTF-8"?>
<dataroot xmlns:od="urn:schemas-microsoft-com:officedata" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  xsi:noNamespaceSchemaLocation="tab_friends.xsd" generated="2016-02-12T10:56:07">
<Table1>
<SRL_NO>1</SRL_NO>
<NAME>ABHISHEK</NAME>
<COMPANY>TCS</COMPANY>
</Table1>
<Table1>
<SRL_NO>2</SRL_NO>
<NAME>SATHIS</NAME>
<COMPANY>CTS</COMPANY>
</Table1>
<Table1>
<SRL_NO>3</SRL_NO>
<NAME>MOURYA</NAME>
<COMPANY>TCS</COMPANY>
</Table1>
<Table1>
<SRL_NO>4</SRL_NO>
<NAME>SONY</NAME>
<COMPANY>ORACLE</COMPANY>
</Table1>
</dataroot>

Steps 1: Create the directory 
create or replace directory DIR_DATA_LOAD as 'D:\TEST';

We can check the info about the already created directory what is the path where we need to keep the xml file from the dba_directories views

select * from dba_directories r where r.directory_name='DIR_DATA_LOAD';

Steps 2: Read/Write access to DIRECTORY
After successful creation of directory we need to give the read ,write access to the user who will use this directory to access the xml file i.e if HR use want to access the file using DIR_DATA_LOAD directory then like below need to give access .

Grant read,write ON DIRECTORY  DIR_DATA_LOAD to HR;

Steps 3: External Table Creation for xml file  

CREATE TABLE hr.ext_tab_xml_frnd
(
srl_no integer,
name varchar2(200),
company varchar2(200)
)
organization external
(
type oracle_loader
default directory DIR_DATA_LOAD
access parameters (
                  records delimited by "</Table1>"
                  BADFILE 'bad.bad'
                  LOGFILE 'log.log'
                  fields missing field values are null
                   (
                    table1 char(2000) terminated by "<Table1>",
                    srl_no CHAR(2000) enclosed by "<SRL_NO>" and "</SRL_NO>",
                    name char(2000) enclosed by "<NAME>" and "</NAME>",
                    company char(2000) enclosed by "<COMPANY>" and "</COMPANY>",
                    table2 char(2000) terminated by "</DATAROOT>"
                    )
                   )
location ('tab_friends.xml')
)
parallel
reject limit unlimited ;

Steps 4: Reading the data of xml file  
Once the external table created we query the table like other table
select * from ext_tab_xml_frnd;

Wanted to create a table from the external table data
Create table xml_frnd 
as 
select * from ext_tab_xml_frnd;

And wanted to store the data into the another table then  select and insert
insert into xml_frnd
select * from ext_tab_xml_frnd;


I am interested in hearing your feedback about this XML file data loading using EXTERNAL TABLE , so that I can improve my lab series on sql for you.connect with us on facebook, twitter

Share

Did you enjoy reading this and found it useful? If so, please share it with your friends: