The issue of external Table...

Hello world

I am new to working on 'EXTERNAL TABLES'. Is it possible to add another column (what is not
in the flat file) with a "default"?

I'm just trying to create a simple TABLE 'EXTERNAL '...

question 1
==========
EX:
===

Flat file that i get will be like this (sample)

ENG,England,English
SCO,Scotland,English
IRE,Ireland,English
WAL,Wales,Welsh

If i create a external table like the following everyting would be fine..

CREATE TABLE countries_ext (
  country_code      VARCHAR2(5),
  country_name      VARCHAR2(50),
  country_language  VARCHAR2(50)
)
ORGANIZATION EXTERNAL (
  TYPE ORACLE_LOADER
  DEFAULT DIRECTORY ext_tables
  ACCESS PARAMETERS (
    RECORDS DELIMITED BY NEWLINE
    FIELDS TERMINATED BY ','
    MISSING FIELD VALUES ARE NULL
    (
      country_code      CHAR(5),
      country_name      CHAR(50),
      country_language  CHAR(50)
    )
  )
  LOCATION ('Countries1.txt','Countries2.txt')
)
PARALLEL 5
REJECT LIMIT UNLIMITED;

but i need another column with a "default value" "N"  which is not in flat file

CREATE TABLE countries_ext (
  country_code      VARCHAR2(5),
  country_name      VARCHAR2(50),
  country_language  VARCHAR2(50)
)
ORGANIZATION EXTERNAL (
  TYPE ORACLE_LOADER
  DEFAULT DIRECTORY ext_tables
  ACCESS PARAMETERS (
    RECORDS DELIMITED BY NEWLINE
    FIELDS TERMINATED BY ','
    MISSING FIELD VALUES ARE NULL
    (
      country_code      CHAR(5),
      country_name      CHAR(50),
      country_language  CHAR(50)
    --,
    -- Valid_flag default value "N"  Is it possible to add this 
                                     column while creating the external table?
                                     this column is not there in the flat file.
    )
  )
  LOCATION ('Countries1.txt','Countries2.txt')
)
PARALLEL 5
REJECT LIMIT UNLIMITED;
quetion2
========

 LOCATION ('Countries1.txt','Countries2.txt')

I have multiple files (around 150) which are in the same format.
Do i have to mention all the file names in the location clause? if i have to create a table 
on those 150 file?

Ex  LOCATION ('Countries1.txt','Countries2.txt','Countries3.txt','Countries4.txt','Countries5.txt','Countries6.txt','Countries7.txt','Countries8.txt', and so on....)

or 

Is it possible to put (countries*.txt)?
Sorry if this topic discussed somewhere in the forum.

Thank you
Phani

The external table requires the exact name of the file, it does not accept wildcards. If filenames are stable, just take the hit and list them all in the LOCATION once. If the file names are fungible Pretreat then screwed by them cutting in a single file, which is the only name in the LOCATION clause.

Cheers, APC

blog: http://radiofreetooting.blogspot.com

Tags: Database

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

    3. I went to drive F:\ to see if emp_dir file exist or not! I did not see it. I checked the files hidden, nothing. Anyway, I ignored and did step 4.

    "Anyway, I ignored him... "

    and so the rest of your problems. I do not see in the steps you told that acually you created a directory ("folder") named "\emp_dir" on your f: drive. Anything that you create the database will actually create this directory on the operating system. Uttering a directory in Oracle, uttering an external table in Oracle, don't create pointers to Oracle objects will assume just actually exists.

  • The external Table storage

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    I'll hit the ORA-DOCS again once, back in the external tables read tonight on them 2 or 3 sources and it is not quite clear whether real data with structure exists outside the database or an internal table set (and stored) retrieves data from an outside source.

    Since data is stored outdoors, and the definition that is stored inside, it means that a the table structure of the outer table is stored in the database as well (or a virtual table based on the definition of the external table...)

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I'll be hitting the ORA-DOCS up again, just got back into external tables tonight reading up on them from 2-3 sources and it is not quite clear if an actual data with structure exists out of the database , or an internally defined (and stored?) table draws data from an outside source.

    I suggest you that start with the documentation of Oracle - including the ground provided the link to:

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  • Load the XML file into Oracle external Table


    I load the data from the XML file into an intermediate table Oracle using external Tables.

    Let's say below, it is my XML file

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    < A_CNT > 10 < / A_CNT >
    < E_CNT > 10 < / E_CNT >
    < AF_CNT > 10 < / AF_CNT >
    < / header >
    < student >
    <>students-details
    < Student_info >
    < Single_Info >
    < ID > 18 / < ID >
    New York < City > < / City >
    < country > United States < / country >
    < Name_lst >
    < Student_name >
    Samuel < name > < / name >
    Paul < Last_name > < / Last_name >
    < DOB > 19871208 < / DOB >
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    < / Student_name >
    < Student_name >
    Samuel < name > < / name >
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    < DOB > 19871208 < / DOB >

    < TerminationDt > 20050812 < / TerminationDt >
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    < / Name_lst >
    < Personal_Info >
    <>men < / Type >
    < 27 > < / Age >
    < / Personal_Info >
    < / Single_Info >
    < / Student_info >

    < student - register >
    class < A >
    < info >
    < detail >
    < ID student > 18 < / student >
    EE < major > < / Major >
    < course-Grades >
    < course > VLSI < / course >
    < degree > 3.0 < / Grade >
    < / course-Grades >
    < course-Grades >
    < course > nanotechnology < / course >
    < degree > 4.0 < / Grade >
    < / course-Grades >
    < / details >
    < detail >
    < ID student > 18 < / student >
    THIS < major > < / Major >
    < / details >
    < / info >
    class < A >
    < Student_Enrol >
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    Thank you

    Reva

    Could you please help me how to insert my XML content into that.

    Same as before, try a plain old INSERT:

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    values)

    XmlType (bfilename ('XML_DIR', "test.xml"), nls_charset_id ('AL32UTF8'))

    );

    But you'll probably hit the same limitation as with the binary XMLType table.

    In this case, you can use FTP to load the file as a resource in the XML DB repository.

    If the XML schema has been registered with the hierarchy enabled then the file will be automatically inserted into the table.

    Could you post the exact statement that you used to save the scheme?

    In the meantime, you can also read this article, I did a few years ago, it covers the XML DB features that may be useful here, including details on how to load the file via FTP:

    https://odieweblog.WordPress.com/2011/11/23/Oracle-XML-DB-a-practical-example/

    And documentation of the course: http://docs.oracle.com/cd/E11882_01/appdev.112/e23094/xdb06stt.htm#ADXDB4672

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