33. Lookup Tables

    Lookup tables are data structures that allow fast access to data stored using a known key or SQL query. This way you can reduce the need to browse a database or data files.

    Remember that you should not use lookup tables in the init(), preExecute() or postExecute() functions of the CTL template and the same methods of Java interfaces.

    All data records stored in any lookup table are kept in files, in databases or cached in memory.

    Lookup tables can be internal or external (shared).

    Types of Lookup Tables

    Simple Lookup Table

    Database Lookup Table

    Range Lookup Table

    Persistent Lookup Table

    Aspell Lookup Table

    Lookup tables can be accessed using CTL functions, see Lookup Table Functions.