.NET/Java PDF, Tiff, Barcode SDK Library

The SQL*Loader control file is a simple text file in which you specify important details about the data load job, such as the location of the source data file. The control file is also the place where you map the data files to the table columns. You can also specify any transformation during the load process within the control file. The control file contains the names of the log files for the load and files for catching bad and rejected data. The control file instructs SQL*Loader regarding the following aspects of the SQL*Loader session: The source of the data to be loaded into the database The column specification of the target table The nature of the input file formatting The mapping of the input file fields to the table columns Data transformation rules (applying SQL functions) The locations for the log files and error files

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Listing 13-1 shows a typical SQL*Loader control file. SQL*Loader considers data rows in the source data files as records, and you can specify the record formats in the control file. Note that you can also use a separate file for the data. In this example, you see the control information followed by in-line data, as shown by the use of the INFILE * specification in the control file. This specification indicates that the data for the load will follow the control information for the load. If you are doing a onetime data load, it is probably better to keep things simple and place the data in the control file itself. The keyword BEGINDATA tells SQL*Loader where the data portion of the control file starts. Listing 13-1. A Typical SQL*Loader Control File LOAD DATA INFILE * BADFILE test.bad DISCARDFILE test.dsc INSERT INTO TABLE tablename FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY"" (column1 POSITION (1:2) CHAR, column2 POSITION (3:9) INTEGER EXTERNAL, column3 POSITION (10:15) INTEGER EXTERNAL, column4 POSITION (16:16) CHAR ) BEGINDATA AY3456789111111Y /* Rest of the data here . . .*/ The portion of the control file that describes the data fields is called the field list. In the control file in Listing 13-1, the field list is the following section: (column1 column2 column3 column4 ) POSITION POSITION POSITION POSITION (1:2) char, (3:9) integer external, (10:15) integer external, (16:16) char

The field list shows the field names, position, data type, delimiters, and any applicable conditions. You can specify numerous variables in the control file, and you can informally sort them into the following groups: Loading-related clauses Data file-related clauses Table- and field-mapping clauses Command-line parameters in the control file The following sections describe the parameters you can specify in the control file to configure your data loads.

he last two chapters covered details about C++/CLI interoperability. These features are not only useful for extending existing projects with features from managed libraries (which was discussed in 7), but they can also be useful if you want to give a native library a managed face so that it can be used by other .NET languages. There are many different scenarios for wrapping native libraries. You can wrap a library whose sources you control, you can wrap part of the Win32 API that is not yet covered by the FCL, and you can even wrap a third-party library. The library you wrap can be implemented as a static library or a DLL. Furthermore, the wrapped library can be a C or a C++ library. This chapter gives you practical advice, general recommendations for all scenarios mentioned, and guidance for a couple of concrete problems.

If you aren t sure which parameters you can use for your SQL*Loader run, just type sqlldr at the operating system prompt to view all the available options. You will see a complete list of all the parameters and their operating system-specific default values (if any exist).

KornShell (ksh): Both firstvar and secondvar are available within the loop. Only secondvar is available outside the loop. Bash (bash): Both firstvar and secondvar are available within the loop. Only secondvar is available outside the loop. This version now performs in the same manner as the ksh version. Public Domain Korn Shell (pdksh): Both firstvar and secondvar are available within the loop. Only secondvar is available outside the loop. Bourne (sh): Both firstvar and secondvar are available within the loop. Neither variable is available outside the loop.