Which method is good

Hi Experts,
We can load data from flat file to oracle tables using
SQL*LOADER
UTL_FILE
EXTERNAL TABLES.
Could you please tell me Out of these three methods which one is good and why?
Please help me.
Thanks in advance.

I agree with Billy, but here's a response anyway hehe!...
SQL*Loader... great for loading files from a client machine, but then you should question why you have data stored on client machines. ;) Also, can only be used from the command line (or a command line call from a scheduled job)
UTL_FILE... great for reading/writing files on a server, but just basic processing of line or bytewise data, not concept of structure included. Can only be used from within PL/SQL code.
External Tables... greate for reading writing structured files on the server, including all the SQL*Loader functionality, and the ability to easily change it to read from multiple files and change filenames if necessary through code. Has the added benefit the data can be treated directly as a table of data and used straight away in SQL statements, and the data can be changed at the file level as required and will be picked up at the next query of it. Being able to use it in SQL also means it's easily available in PL/SQL code too.
Me personally, External tables are always the first option.

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HI
Different Mapping Techniques are available in XI. They are: Message Mapping, XSLT Mapping, Java Mapping and ABAP mapping.
u2022The integration repository includes a graphical mapping editor. It includes built-in functions for value transformations and queue and context handling. There is an interface for writing user-defined functions (java) as well.
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For e.g. consider a simple File->IDoc scenarion where the source file is a simple XML file, whereas the target file is an IDoc with more than one hierarchy level e.g FINSTA01. Content conversion in XI can only create a single level hierarchy, so in this scenario a Java mapping would come in handy.
See these:
http://help.sap.com/saphelp_nw04/helpdata/en/e2/e13fcd80fe47768df001a558ed10b6/frameset.htm
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/10dd67dd-a42b-2a10-2785-91c40ee56c0b
/people/prasad.ulagappan2/blog/2005/06/29/java-mapping-part-i
/people/thorsten.nordholmsbirk/blog/2006/08/10/using-jaxp-to-both-parse-and-emit-xml-in-xi-java-mapping-programs
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Advantages of Java Mapping
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3) DOM is easier to use with lots of classes to help you create nodes and elements.
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http://help.sap.com/saphelp_nw70/helpdata/EN/ba/e18b1a0fc14f1faf884ae50cece51b/frameset.htm
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/5c46ab90-0201-0010-42bd-9d0302591383
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/e3ead790-0201-0010-64bb-9e4d67a466b4
/people/sameer.shadab/blog/2005/09/29/testing-abap-mapping
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/people/udo.martens/blog/2006/08/23/comparing-performance-of-mapping-programs
https://websmp101.sap-ag.de/~sapdownload/011000358700003082332004E/HowToABAPMapping.pdf
/people/ravikumar.allampallam/blog/2005/02/10/different-types-of-mapping-in-xi
/people/r.eijpe/blog
ABAP Mapping Vs Java Mapping.
Re: Message Mapping of type ABAP Class not being shown
Re: Performance of mappings (JAVA, XSLT, ABAP)
XSLT Mapping
XSLT stands for EXtensible Stylesheet Language Transformations. It is an XML based language for transforming XML documents into any other formats suitable for browser to display, on the basis of set of well-defined rules.
/people/sap.user72/blog/2005/03/15/using-xslt-mapping-in-a-ccbpm-scenario
/people/anish.abraham2/blog/2005/12/22/file-to-multiple-idocs-xslt-mapping
The above menotined are the mapping present in the XI.
When it is critical and complicate we go for the ABAP,JAVA or XSLt mapping. For simple Mapping we go for the graphical mapping.
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cheers

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