HP 3000 Manuals

HP ALLBASE/4GL Developer Reference Manual Vol. 2

Decision Table Questions Screen 

This screen allows you to define the questions that the decision table
tests.

Screen Image 


            

Field Descriptions 

Decision Table Name.  Enter the name of a decision table that has been
defined on the decision table header screen.

Secured.  Display-only field indicating the status of the Secured field
on the decision table header screen.

Data name 1.  You must complete this field for each decision table
question.

Enter the name of the first operand for the logic IF test.  The entry in
this field can be one of the following:

   *   Whole number.

   *   Literal.

   *   Numeric or alphanumeric constant.

   *   Variable or calculated item.

   *   Screen field reference.

   *   Scratch-pad field reference.

   *   File record field reference.

   *   Work area field reference.

   *   Communication area field name.

   *   Switch name or number.

Data name 2.  Enter the name of the second operand for the logic IF test.
This field is only required if the particular decision table question
uses a relational operator to perform the IF test.  The acceptable
entries for this field are the same as the entries for the Data name 1 
field, except that you cannot use a switch name or number in this field.

IF Test.  You must complete this field for each decision table question.

Enter the IF test to be applied to the operands in the Data name 1 field
(and optionally the Data name 2 field).  The IF test can test the
relationship between the two operands according to a relational operator,
or test the content of a single operand (Data name 1), or test the status
of a switch.

If you are testing the relationship between two different operands, the
entry in this field must be one of the following relational operators:

            =             equal to

           < >            not equal to

            >             greater than

           >=             greater than or equal to

            <             less than

           <=             less than or equal to

The edit codes for the operands used with relational operators determine
the nature of the relational test.  If you are comparing two numeric
values, all relation tests are performed according to strict numerical
order.  If you are comparing two alphanumeric fields or comparing a field
with a literal, the comparison is performed on a character-by-character
basis according to the system collating sequence.  (Refer to appendix A.)


NOTE  If you are using a relational operator to test the relationship
      between two operands, make sure the two operands both have the same
      edit code, or contain the same type of data.


If you are testing the contents of the operand in the Data name 1 field,
the entry in this field must be one of *BLANK, *ALPHA, *NUMERIC, or
*NULL. The *NULL contents test is only valid for testing the contents of
a file record field for an HP ALLBASE/SQL table or select list.

If you are testing the status of a switch, the entry in this field must
be either *ON or *OFF.

Function Keys 

f1       Header  Cancels the current screen and displays the decision
        table header screen.

f2       Actions  Cancels the current screen and displays the decision
        table actions screen.

f3       R'ships  Cancels the current screen and displays the decision
        table relationships screen.

f4       Generate D.Table  Generates the decision table.

Additional Information 

The screen allows you to enter up to eight questions for the table.  Each
question must be expressed in the same format as a logic IF command.
That is, one of the following forms:

 operand relational-operator operand 

 operand *BLANK

 operand *ALPHA

 operand *NUMERIC

 operand *NULL

 switch-name *ON

 switch-name *OFF

The entry in the Data name 1 field corresponds to the first of the
operands,

The entry in the IF Test field must be one of:  relational-operator,
*BLANK, *ALPHA, *NUMERIC, *NULL, *ON, *OFF.

An entry in the Data name 2 field is only required if the IF test uses a
relational operator, and corresponds to the second operand.

Refer to chapter 12 for details of the logic IF command.

MPE/iX 5.0 Documentation