The following programs demonstrate the use of the
    DECLARE_VARIABLE clause to declare a program variable. These
    programs:

    o  Declare the variable, badge, to have the same data type and
       size attributes as EMPLOYEE_ID in the EMPLOYEES relation.

    o  Use this variable for interactive processing. Note that the
       interactive portion of the programs appear before the READY
       statement. This keeps locks on the database to a minimum.

    o  Select the record from the EMPLOYEES relation that has the
       same value for EMPLOYEE_ID as is stored in badge.

    o  Modify the STATUS_CODE field of this record.

    Note that the C program uses the read_string function to prompt
    for and receive a value for badge. For more information on this
    function see Appendix B of the "RDML Reference Manual".

1  –  C Example

    #include <stdio.h>
    DATABASE PERS = FILENAME "PERSONNEL";

    extern void read_string();
    static DECLARE_VARIABLE badge SAME AS EMPLOYEES.EMPLOYEE_ID;

    main()
    {
    read_string ("Employee ID: ", badge, sizeof(badge));

    READY PERS;
    START_TRANSACTION READ_WRITE;

    FOR E IN EMPLOYEES WITH E.EMPLOYEE_ID = badge
       MODIFY E USING
          strcpy(E.STATUS_CODE,"1");
       END_MODIFY;
    END_FOR;

    ROLLBACK;
    FINISH;
    }

2  –  Pascal Example

    program modify_with_host (input,output);
    DATABASE PERS = FILENAME 'PERSONNEL';

    var
       DECLARE_VARIABLE badge SAME AS EMPLOYEES.EMPLOYEE_ID;

    begin
    write  ('Employee ID: ');
    readln (badge);

    READY PERS;
    START_TRANSACTION READ_WRITE;

    FOR E IN EMPLOYEES WITH E.EMPLOYEE_ID = badge
        MODIFY E USING
            E.STATUS_CODE := '1';
        END_MODIFY;
    END_FOR;

    ROLLBACK;
    FINISH;
    end.