Simple .NET/ASP.NET PDF document editor web control SDK

debug=2 test $debug -gt 0 && echo "A little data" test $debug -gt 1 && echo "Some more data" test $debug -gt 2 && echo "Even some more data"

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Expression value: You can set a column to the value specified by a SQL operator or a PL/SQL function. You specify the expression value using the EXPRESSION parameter, as shown here: column_name EXPRESSION "SQL string" Data file record number: You can set a column s value to the record number that loaded that row by using the RECNUM column specification: record_num RECNUM System date: You can use the sysdate variable to set a column to the date you re loading the data: loaded_date sysdate

Sequence: You can generate unique values to load a column by using the SEQUENCE function. In the following example, the current maximum value of the loadseq sequence is incremented by one each time a row is inserted: loadseq SEQUENCE(max,1)

You can invoke the SQL*Loader utility in a number of ways. The standard syntax for invoking the SQL*Loader is as follows: SQLLDR keyword=value [,keyword=value,. . .] Here s an example showing how to invoke the SQL*Loader: $ sqlldr USERID=nicholas/nicholas1 CONTROL=/u01/app/oracle/finance/finance.ctl \ DATA=/u01/app/oracle/oradata/load/finance.dat \ LOG=/u01/aapp/oracle/finance/log/finance.log \ ERRORS=0 DIRECT=true SKIP=235550 RESUMABLE=true RESUMABLE_TIMEOUT=7200

In the command-line invocation of the SQL*Loader utility, the backslash (\) at the end of each line simply indicates that the command continues on the next line. You can specify a command-line parameter with the parameter name itself or by position. For example, the username/password specification always follows the keyword sqlldr. If you ignore a parameter, Oracle will use the default value for that parameter. You can optionally use a comma after each parameter.

/* ... implementation can be ignored so far ... */ }; class AnotherCipherAlgorithm : public CryptoAlgorithm { /* ... implementation can be ignored so far ... */ }; } This API allows a programmer to do the following: Instantiate and use SampleCipher Instantiate and use AnotherCipherAlgorithm Derive a class from CryptoAlgorithm, SampleCipher, or AnotherCipherAlgorithm, and override Encrypt or Decrypt Supporting these three features in a managed wrapper is way more complicated than it may seem at first. The support for inheritance of wrapper classes especially adds a lot of complexity. As I will discuss later in the chapter, supporting virtual functions requires extra proxy classes, which is a runtime overhead as well as an implementation overhead. However, chances are good that a wrapper library is only needed to use one or both algorithms. Wrapping this API without supporting inheritance simplifies the task. With this simplification, there is no need to create a wrapper type for the abstract class CryptoAlgorithm. Also, it is not necessary to treat the virtual functions Encrypt and Decrypt specially. To make clear that you don t want to support inheritance, it is sufficient to declare the wrapper classes for SampleCipher and AnotherCipherAlgorithm as sealed classes.

If these three lines were executed in a script, only the output from the first two would be displayed. If you were to change the logic of the test from greater than (-gt) to equal to (-eq), only the output of the last debug statement would be displayed. My mind works best when things are simple. For simple scripts I usually set the debug value to either on or off. Multilevel debugging is more valuable for larger scripts, since the code can become quite complex and difficult to track. Using multiple debug levels in a complex script allows you to follow the code s logic as it executes, selecting the level of detail desired. A further improvement to this technique is to design the script to accept a debug switch when the script is called. You can then use the switch to specify whatever value of debug level you desire for the information you re looking for, without having to modify the code every time you would like to view debugging output. See 5 for more information on how to process command-line switches passed to a script.

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