Apress.Expert.Oracle.Database.Architecture.9i.and.10g.Programming.Techniques.and.Solutions.Sep.2005

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CHAPTER 15 ■ DATA LOADING AND UNLOADING 677 To load a LOB into an ORDIMAGE type column, we must understand a little more about the structure of the ORDIMAGE type. Using a table we want to load into, and a DESCRIBE on that table in SQL*Plus, we can discover that we have a column called IMAGE of type ORDSYS.ORDIMAGE, which we want to ultimately load into IMAGE.SOURCE.LOCALDATA. The following examples will work only if you have interMedia installed and configured; otherwise, the datatype ORDSYS.ORDIMAGE will be an unknown type: ops$tkyte@ORA10G> create table image_load( 2 id number, 3 name varchar2(255), 4 image ordsys.ordimage 5 ) 6 / Table created. ops$tkyte@ORA10G> desc image_load Name Null? Type ---------------------------------------- -------- ---------------------------- ID NUMBER NAME VARCHAR2(255) IMAGE ORDSYS.ORDIMAGE ops$tkyte@ORA10G> desc ordsys.ordimage Name Null? Type ---------------------------------------- -------- ---------------------------- SOURCE ORDSYS.ORDSOURCE HEIGHT NUMBER(38) WIDTH NUMBER(38) CONTENTLENGTH NUMBER(38) ... ops$tkyte@ORA10G> desc ordsys.ordsource Name Null? Type ---------------------------------------- -------- ---------------------------- LOCALDATA BLOB SRCTYPE VARCHAR2(4000) SRCLOCATION VARCHAR2(4000) ... ■Note You could issue SET DESC DEPTH ALL or SET DESC DEPTH in SQL*Plus to have the entire hierarchy displayed at once. Given that the output for the ORDSYS.ORDIMAGE would have been many pages long, I chose to do it piece by piece.
678 CHAPTER 15 ■ DATA LOADING AND UNLOADING So a control file to load this might look like this: LOAD DATA INFILE * INTO TABLE image_load REPLACE FIELDS TERMINATED BY ',' ( ID, NAME, file_name FILLER, IMAGE column object ( SOURCE column object ( LOCALDATA LOBFILE (file_name) TERMINATED BY EOF NULLIF file_name = 'NONE' ) ) ) BEGINDATA 1,icons,icons.gif I have introduced two new constructs here: • COLUMN OBJECT: This tells SQLLDR that this is not a column name; rather, it is part of a column name. It is not mapped to a field in the input file, but is used to build the correct object column reference to be used during the load. In the preceding file, we have two column object tags, one nested in the other. Therefore, the column name that will be used is IMAGE.SOURCE.LOCALDATA, as we need it to be. Note that we are not loading any of the other attributes of these two object types (e.g., IMAGE.HEIGHT, IMAGE. CONTENTLENGTH, and IMAGE.SOURCE.SRCTYPE). Shortly, we’ll see how to get those populated. • NULLIF FILE_NAME = 'NONE': This tells SQLLDR to load a NULL into the object column in the event that the field FILE_NAME contains the word NONE in it. Once you have loaded an interMedia type, you will typically need to postprocess the loaded data using PL/SQL to have interMedia operate on it. For example, with the preceding data, you would probably want to run the following to have the properties for the image set up correctly: begin for c in ( select * from image_load ) loop c.image.setproperties; end loop; end; / SETPROPERTIES is an object method provided by the ORDSYS.ORDIMAGE type, which processes the image itself and updates the remaining attributes of the object with appropriate values.
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Expert Oracle Database Architecture
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Contents Foreword . . . . . . . . .
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■CONTENTS v Block Buffer Cache .
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■CONTENTS vii ■CHAPTER 9 Redo a
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■CONTENTS ix ■CHAPTER 12 Dataty
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Foreword “THINK.” In 1914, Thom
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■FOREWORD xiii Tom is an aficiona
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About the Technical Reviewers ■JO
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Introduction The inspiration for th
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■INTRODUCTION xix • Exposure to
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■INTRODUCTION xxi Chapter 3: File
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■INTRODUCTION xxiii Next up are t
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Setting Up Your Environment In this
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CHAPTER 1 ■ DEVELOPING SUCCESSFUL
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CHAPTER 4 ■ MEMORY STRUCTURES 117
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Apress.Expert.Oracle.Database.Architecture.9i.and.10g.Programming.Techniques.and.Solutions.Sep.2005

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