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You can apply SQL functions to the field data before loading it into table columns. Only SQL functions that return single values can be used for transforming field values in general. The field should be denoted inside the SQL string as field_name. You specify the SQL function(s) after you specify the data type for the field, and you enclose the SQL string in double quotation marks, as shown in the following examples: field_name CHAR TERMINATED BY "," "SUBSTR(:field_name, 1, 10)" employee_name POSITION 32-62 CHAR "UPPER(:ename)" salary position 75 CHAR "TO_NUMBER(:sal,'$99,999.99')" commission INTEGER EXTERNAL "":commission * 100" As you can see, the application of SQL operators and functions to field values before they are loaded into tables helps you transform the data at the same time you are loading it. This is a handy feature.

SQL*Loader allows you to specify a number of runtime parameters at the command line when you invoke the SQL*Loader executable. Usually, you specify in the parameter file those parameters whose values remain the same across jobs. You can then use the command line to start the SQL*Loader job, either interactively or as part of a scheduled batch job. On the command line, you specify runtimespecific parameters, along with the control filename and location. As an alternative, you may use the OPTIONS clause of the control file to specify runtime parameters inside the control file itself. You can always specify a number of runtime parameters while invoking SQL*Loader, but you re better off using the OPTIONS clause to specify them in the control file, if those parameters are something you ll repeat often. Using the OPTIONS clause comes in handy particularly if your SQL*Loader command-line specification is so long that it exceeds your operating system s maximum command-line size.

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In the following example, we create some binary data in our table using SYS_GUID(), a built-in function that returns a 16-byte RAW string that is globally unique (GUID stands for globally unique identifier): ops$tkyte@ORA11GR2> insert into t values ( sys_guid() ); 1 row created ops$tkyte@ORA11GR2> select * from t; RAW_DATA -------------------------------FD1EB03D3718077BE030007F01002FF5 You can immediately note two things here First, the RAW data looks like a character string That is just how SQL*Plus retrieved and printed it; that is not how it is stored on disk SQL*Plus cannot print arbitrary binary data on your screen, as that could have serious side effects on the display Remember that binary data may include control characters such as a carriage return or linefeed or maybe a Ctrl-G character that would cause your terminal to beep.

The concept behind the function SUBSTR_OF is to take a query that selects at most one row and one column: the LONG value we are interested in SUBSTR_OF will parse that query if needed, bind any inputs to it, and fetch the results programmatically, returning the necessary piece of the LONG value The package body, the implementation, begins with two global variables The G_CURSOR variable holds a persistent cursor open for the duration of our session This is to avoid having to repeatedly open and close the cursor and to avoid parsing SQL more than we need to The second global variable, G_QUERY, is used to remember the text of the last SQL query we ve parsed in this package As long as the query remains constant, we ll just parse it once.

Specifying a parameter on the command line will override the parameter s values inside a control file.

The following sections cover some of the important parameters you can control using the OPTIONS clause in the control file.

Second, the RAW data looks much larger than 16 bytes in fact, in this example, you can see 32 characters This is due to the fact that every binary byte takes two hexadecimal characters to display The.

So, even if we query 5,000 rows in a query, as long as the SQL query we pass to this function doesn t change, we ll have only one parse call: ops$tkyte@ORA10G> create or replace package body long_help 2 as 3 4 g_cursor number := dbms_sqlopen_cursor; 5 g_query varchar2(32765); 6 Next in this package is a private procedure, BIND_VARIABLE, that we ll use to bind inputs passed to us by the caller We implemented this as a separate private procedure only to make life easier; we want to bind only when the input name is NOT NULL Rather than perform that check four times in the code for each input parameter, we do it once in this procedure: 7 8 9 10 11 12 13 14 15 procedure bind_variable( p_name in varchar2, p_value in varchar2 ) is begin if ( p_name is not null ) then dbms_sql.

The USERID parameter specifies both the username and the password of the user in the database who has the privileges for the data load: USERID = samalapati/sammyy1

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