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

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CHAPTER 15 ■ DATA LOADING AND UNLOADING 675 The one thing to observe here is that the doubled-up quotes are no longer doubled up. SQLLDR removed the extra quotes we placed there. Loading LOB Data That Is Out of Line A common scenario is to have a data file that contains the names of files to load into the LOBs, instead of having the LOB data mixed in with the structured data. This offers a greater degree of flexibility, as the data file given to SQLLDR does not have to use one of the four methods to get around having embedded newlines in the input data, as would frequently happen with large amounts of text or binary data. SQLLDR calls this type of additional data file a LOBFILE. SQLLDR can also support the loading of a structured data file that points to another, single data file. We can tell SQLLDR how to parse LOB data from this other file, so that each row in the structured data gets loaded with a piece of it. I find this mode to be of limited use (I’ve never found a use for it myself to date), and I will not discuss it here. SQLLDR refers to these externally referenced files as complex secondary data files. LOBFILEs are relatively simple data files aimed at facilitating LOB loading. The attribute that distinguishes LOBFILEs from the main data files is that in LOBFILEs, there is no concept of a record, hence newlines never get in the way. In LOBFILEs, the data is in any of the following formats: • Fixed-length fields (e.g., load bytes 100 through 1,000 from the LOBFILE) • Delimited fields (terminated by something or enclosed by something) • Length/value pairs, a variable-length field The most common of these types is the delimited fields—ones that are terminated by an end-of-file (EOF), in fact. Typically, you have a directory full of files you would like to load into LOB columns, and each file in its entirety will go into a BLOB. The LOBFILE statement with TERMINATED BY EOF is what you will use. Say we have a directory full of files we would like to load into the database. We would like to load the OWNER of the file, the TIME_STAMP of the file, the NAME of the file, and the file itself. The table we would load into would be as follows: ops$tkyte@ORA10G> create table lob_demo 2 ( owner varchar2(255), 3 time_stamp date, 4 filename varchar2(255), 5 data blob 6 ) 7 / Table created. Using a simple ls –l on UNIX, and dir /q /n on Windows, and capturing that output, we can generate our input file and load it using a control file such as this on UNIX: LOAD DATA INFILE * REPLACE INTO TABLE LOB_DEMO ( owner position(17:25),
676 CHAPTER 15 ■ DATA LOADING AND UNLOADING time_stamp position(44:55) date "Mon DD HH24:MI", filename position(57:100), data LOBFILE(filename) TERMINATED BY EOF ) BEGINDATA -rw-r--r-- 1 tkyte tkyte 1220342 Jun 17 15:26 classes12.zip -rw-rw-r-- 1 tkyte tkyte 10 Jul 16 16:38 foo.sql -rw-rw-r-- 1 tkyte tkyte 751 Jul 16 16:36 t.ctl -rw-rw-r-- 1 tkyte tkyte 491 Jul 16 16:38 testa.sql -rw-rw-r-- 1 tkyte tkyte 283 Jul 16 16:38 testb.sql -rw-rw-r-- 1 tkyte tkyte 231 Jul 16 16:38 test.sh -rw-rw-r-- 1 tkyte tkyte 235 Apr 28 18:03 test.sql -rw-rw-r-- 1 tkyte tkyte 1649 Jul 16 16:36 t.log -rw-rw-r-- 1 tkyte tkyte 1292 Jul 16 16:38 uselast.sql -rw-rw-r-- 1 tkyte tkyte 909 Jul 16 16:38 userbs.sql Now, if we inspect the contents of the LOB_DEMO table after running SQLLDR, we will discover the following: ops$tkyte@ORA10G> select owner, time_stamp, filename, dbms_lob.getlength(data) 2 from lob_demo 3 / OWNER TIME_STAM FILENAME DBMS_LOB.GETLENGTH(DATA) -------- --------- -------------- ------------------------ tkyte 17-JUN-05 classes12.zip 1220342 tkyte 16-JUL-05 foo.sql 10 tkyte 16-JUL-05 t.ctl 875 tkyte 16-JUL-05 testa.sql 491 tkyte 16-JUL-05 testb.sql 283 tkyte 16-JUL-05 test.sh 231 tkyte 28-APR-05 test.sql 235 tkyte 16-JUL-05 t.log 0 tkyte 16-JUL-05 uselast.sql 1292 tkyte 16-JUL-05 userbs.sql 909 10 rows selected. This works with CLOBs as well as BLOBs. Loading a directory of text files using SQLLDR in this fashion is easy. Loading LOB Data into Object Columns Now that we know how to load into a simple table we have created ourselves, we might also find the need to load into a table that has a complex object type with a LOB in it. This happens most frequently when using the image capabilities. The image capabilities are implemented using a complex object type, ORDSYS.ORDIMAGE. We need to be able to tell SQLLDR how to load into this.
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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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■SETTING UP YOUR ENVIRONMENT xxvi
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■SETTING UP YOUR ENVIRONMENT xlii
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CHAPTER 1 ■ ■ ■ Developing Su
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CHAPTER 1 ■ DEVELOPING SUCCESSFUL
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CHAPTER 3 ■ FILES 71 all operatio
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CHAPTER 3 ■ FILES 89 A Brief Revi
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CHAPTER 3 ■ FILES 91 Redundant Ar
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CHAPTER 3 ■ FILES 93 (data from m
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CHAPTER 3 ■ FILES 95 dictionary t
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CHAPTER 3 ■ FILES 113 tkyte@ORA10
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CHAPTER 4 ■ ■ ■ Memory Struct
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CHAPTER 4 ■ MEMORY STRUCTURES 117
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CHAPTER 5 ■ ORACLE PROCESSES 157
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CHAPTER 6 ■ LOCKING AND LATCHING
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CHAPTER 8 ■ ■ ■ Transactions
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284 CHAPTER 9 ■ REDO AND UNDO cri
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294 CHAPTER 9 ■ REDO AND UNDO row
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298 CHAPTER 9 ■ REDO AND UNDO ops
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338 CHAPTER 10 ■ DATABASE TABLES
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CHAPTER 11 ■ ■ ■ Indexes Inde
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CHAPTER 11 ■ INDEXES 423 value of
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CHAPTER 11 ■ INDEXES 445 Indicate
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CHAPTER 11 ■ INDEXES 447 an index
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CHAPTER 11 ■ INDEXES 449 Table 11
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CHAPTER 13 ■ ■ ■ Partitioning
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Apress.Expert.Oracle.Database.Architecture.9i.and.10g.Programming.Techniques.and.Solutions.Sep.2005

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