In addition to the predefined datatypes, the PLV package offers a set of constants that are used throughout PL/Vision. These constants define the type of input or output repository you want to use in a given situation. These constants are used in PLVio, PLVlog, and PLVexc. The input/output options in PL/Vision are shown in the following table.
For example, if you want to define the target repository of the PLVio package to be a PL/SQL table, you will issue this command:
SQL> exec PLVio.settrg (PLV.pstab);
If you want PLVlog to write its information to an operating system file, you will execute this command:
SQL> exec PLVlog.tofile;
which in turn sets the v_log_type variable to the PLV.file constant.
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