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

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CHAPTER 15 ■ DATA LOADING AND UNLOADING 673 you may also use DBMS_LOB.READ on the BFILE to read the data. The use of UTL_RAW.CAST_TO_ VARCHAR2 is handy here if the data you are reading is in fact text, not RAW. You may then use DBMS_LOB.WRITE or WRITEAPPEND to place the data into a CLOB or BLOB. Loading LOB Data via SQLLDR We will now investigate how to load data into a LOB via SQLLDR. There is more than one method for doing this, but we will investigate the two most common methods: • When the data is “inline” with the rest of the data. • When the data is stored out of line, and the input data contains a file name to be loaded with the row. These are also known as secondary data files (SDFs) in SQLLDR terminology. We will start with data that is inline. Loading LOB Data That Is Inline These LOBs will typically have newlines and other special characters embedded in them. Therefore, you will almost always use one of the four methods detailed in the “How Do I Load Data with Embedded Newlines?” section to load this data. Let’s begin by modifying the DEPT table to have a CLOB instead of a big VARCHAR2 field for the COMMENTS column: ops$tkyte@ORA10G> truncate table dept; Table truncated. ops$tkyte@ORA10G> alter table dept drop column comments; Table altered. ops$tkyte@ORA10G> alter table dept add comments clob; Table altered. For example, say we have a data file (demo.dat) that has the following contents: 10, Sales,Virginia,This is the Sales Office in Virginia| 20,Accounting,Virginia,This is the Accounting Office in Virginia| 30,Consulting,Virginia,This is the Consulting Office in Virginia| 40,Finance,Virginia,"This is the Finance Office in Virginia, it has embedded commas and is much longer than the other comments field. If you feel the need to add double quoted text in here like this: ""You will need to double up those quotes!"" to preserve them in the string. This field keeps going for up to 1000000 bytes (because of the control file definition I used) or until we hit the magic end of record marker, the | followed by an end of line - it is right here ->"|
674 CHAPTER 15 ■ DATA LOADING AND UNLOADING Each record ends with a pipe symbol (|), followed by the end-of-line marker. The text for department 40 is much longer than the rest, with many newlines, embedded quotes, and commas. Given this data file, we can create a control file such as this: LOAD DATA INFILE demo.dat "str X'7C0A'" INTO TABLE DEPT REPLACE FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"' TRAILING NULLCOLS (DEPTNO, DNAME "upper(:dname)", LOC "upper(:loc)", COMMENTS char(1000000) ) ■Note This example is from UNIX, where the end-of-line marker is 1 byte, hence the STR setting in the preceding control file. On Windows, it would have to be '7C0D0A'. To load the data file, we specify CHAR(1000000) on the column COMMENTS since SQLLDR defaults to CHAR(255) for any input field. The CHAR(1000000) will allow SQLLDR to handle up to 1,000,000 bytes of input text. You must set this to a value that is larger than any expected chunk of text in the input file. Reviewing the loaded data, we see the following: ops$tkyte@ORA10G> select comments from dept; COMMENTS ------------------------------------------------------------------------------- This is the Consulting Office in Virginia This is the Finance Office in Virginia, it has embedded commas and is much longer than the other comments field. If you feel the need to add double quoted text in here like this: "You will need to double up those quotes!" to preserve them in the string. This field keeps going for up to 1000000 bytes or until we hit the magic end of record marker, the | followed by an end of line - it is right here -> This is the Sales Office in Virginia This is the Accounting Office in Virginia
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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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