Wednesday, July 7, 2010

SQL Loader Overview

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SQL*Loader is a bulk loader utility used for moving data from external files into the Oracle database. It supports various load formats, selective loading, and multi-table loads.

Below are the examples of loading data into Tables using different methods

Load Fixed length Data Records
LOAD DATA
INFILE *
INTO TABLE load_delimited_data
FIELDS TERMINATED BY "," OPTIONALLY ENCLOSED BY '"'
TRAILING NULLCOLS
( data1,
data2
)
BEGINDATA
11111,AAAAAAAAAA
22222,"A,B,C,D,"

Load Positional Data Records
LOAD DATA
INFILE *
INTO TABLE load_positional_data
( data1 POSITION(1:5),
data2 POSITION(6:15)
)
BEGINDATA
11111AAAAAAAAAA
22222BBBBBBBBBB

Skip First 2 Header Records while Loading
LOAD DATA
INFILE *
INTO TABLE load_positional_data
SKIP 2
( data1 POSITION(1:5),
data2 POSITION(6:15)
)
BEGINDATA
NNNNNNNNNNNNNNN
UUUUUUUUUUUUUUU
11111AAAAAAAAAA
22222BBBBBBBBBB

Loading Data into Multiple Tables
LOAD DATA
INFILE *
REPLACE
INTO TABLE emp
WHEN empno != ' '
( empno POSITION(1:4) INTEGER EXTERNAL,
ename POSITION(6:15) CHAR,
deptno POSITION(17:18) CHAR,
mgr POSITION(20:23) INTEGER EXTERNAL
)
INTO TABLE proj
WHEN projno != ' '
( projno POSITION(25:27) INTEGER EXTERNAL,
empno POSITION(1:4) INTEGER EXTERNAL
)

Skip Certain Columns while Loading DataLOAD DATA
TRUNCATE INTO TABLE T1
FIELDS TERMINATED BY ','
( field1,
field2 FILLER,
field3
)

Erroneous data after loading with SQL Loader

Our Database is created with below settingsCHARACTER SET "UTF8"
NATIONAL CHARACTER SET "WE8ISO8859P1"
NLS_LANGUAGE = AMERICAN
NLS_TERRITORY = AMERICA

Include below code in control file to avoid junk data load using SQL loaderLOAD DATA
CHARACTERSET WE8ISO8859P1
APPEND INTO TABLE XXAP_GENERIC_INVOICES
FIELDS TERMINATED BY ','
OPTIONALLY ENCLOSED BY '"'
TRAILING NULLCOLS
(operating_unit
,vendor_number
)

Using SQL Functions for Loader Columns
LOAD DATA
APPEND INTO TABLE
XXAR_INV_AT
FIELDS TERMINATED BY ""
OPTIONALLY ENCLOSED BY '"'
TRAILING NULLCOLS
(
DESCRIPTION "NVL(:DESCRIPTION,'Migrated from Legacy')",
TRX_DATE "TO_CHAR(TO_DATE(:TRX_DATE,'YYYYMMDD'),'DD-MON-YYYY')" ,
GL_DATE "TO_CHAR(TO_DATE(:GL_DATE,'YYYYMMDD'),'DD-MON-YYYY')" ,
TAX_RATE "REPLACE(:TAX_RATE,'%','')",
STAGING_TABLE_ID "XXAR_INV_AT_S1.NEXTVAL",
CREATION_DATE SYSDATE,
LAST_UPDATE_DATE SYSDATE
SOURCE "TRIM(REPLACE(:SOURCE,(SUBSTR(:SOURCE,LENGTH(:SOURCE),1)),''))"
)
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1 comment:

  1. This post gives SQL leader overview. I find this post informational. The syntax doesn't seem difficult so one can easy learn them. I think you done a fantastic work. I am going to implement the code in my application. Thanks for the information.

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