.NET/ASP.NET/C#/VB.NET PDF Document SDK

Here s a simple example of how you can trap the process error codes issued by SQL*Loader: $ sqlldr PARFILE=test.par retcode=$ if [[retcode !=2 ]] then mv ${ImpDir}/${Fil} ${InvalidLoadDir}/.${Dstamp}.${Fil} writeLog $func "Load Error" "load error:${retcode} on file ${Fil}" else sqlplus / ___EOF /* You can place any SQL statements to process the successfully loaded data */ ___EOF

#!/bin/ksh set `echo a b c d e` while [ "$1" != "" ] do foo=$1 bar=$2 echo $* shift echo foo $foo echo bar $bar done

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Once you have created the wrapper class, you have to add members that allow a .NET client to invoke the member functions on the wrapped object. To ensure language interoperability, the members of your wrapper class must have only CLS-compliant types in their signature. If a function from the native API has an unsigned integer type, it is often sufficient to use a signed type of the same size instead. Finding equivalent types for native pointers and native references is not always that easy. In a few cases, you can use System::IntPtr instead of native pointers. This allows managed code to receive a native pointer and treat it as a handle that can be passed as an argument of a later function call. This case is simple because System::IntPtr has the same binary layout as a native pointer. In all other cases, a manual conversion of one or more parameters is necessary. Even though this can be time-consuming, there is no way to avoid this extra cost. Let s have a look at different wrappings that you may face. For arguments of C++ reference types and pointer arguments with pass-by-reference semantics, it is recommended to define tracking reference arguments in the managed wrapper function. As an example, consider the following native function: void f(int& i);

SQL*Loader supports the XML data type for columns. If a column is of this type, you can use SQL*Loader to load the XML data into a table. SQL*Loader treats the XML columns as CLOBs. Oracle also lets you load the XML data either from a primary data file or from an external LOB file. You can use fixed-length fields or delimited fields. The contents of the entire file could also be read into a single LOB field.

For many years, Oracle DBAs used SQL*Loader almost exclusively for loading data into Oracle database tables from outside sources, employing either the conventional loading method or the direct-path loading method. Oracle s external tables feature goes one step further and enables you to use the SQL*Loader functionality to access data stored in operating system files without ever loading the data into a real Oracle table. External tables aren t a new feature of Oracle Database 10g. Oracle9i first introduced the concept, but in Oracle9i, you could only read from external tables (data load). Now, in Oracle Database 10g, you can also to write to external tables (data unload).

If your source data doesn t need any transformations when loading into the database, using the SQL*Loader to perform a conventional or a direct load is sufficient External tables complement the functionality of the SQL*Loader If you want to perform major data transformations before the load, then external tables are the recommended way to go Using the external tables feature, you can visualize external data as if it were stored in an Oracle table When you create an external table, the columns are listed the same way as they are when you create a regular table However, the data fields in the external file are merely mapped to the external table columns, not actually loaded into them External tables don t actually exist anywhere, inside or outside the database.