Hp Integrity NonStop J-Series Instrukcja Użytkownika Pobierz pdf (Strona 169)

USING AN ENABLE APPLICATION

READ EXACT

READ APPROXIMATE Operation for a Nested Box

For a nested box, you can perform a READ APPROXIMATE operation

only if a key field appears in the box. (If a key field does not

appear and you request a READ APPROXIMATE operation, the

application will perform a READ EXACT operation.) If a key field

appears, do the following to request a READ APPROXIMATE

operation:

1. Read or insert a record in the containing box.

2. Enter a value in the key field of the nested box.

3. Press F6.

READ EXACT (F7)

To retrieve the first record (or records) with a key field value

that exactly matches the one you have entered, request a READ

EXACT operation. If you enter a value for a primary key field,

the application returns the single existing record. If you enter

a value for an alternate key field that has duplicate values, the

application retrieves the first record (or records) that has that

alternate key value.

If the key field is a group key field, you must enter a value for

all the fields in the group. Consider, for example, the

following group key field:

+ DEPT

REGNUM __

BRANCHNUM __

To request a READ EXACT for the DEPT field, you must first enter

a value in both REGNUM and BRANCHNUM. If you enter a 1 in REGNUM

and do not enter a value in BRANCHNUM, the application will not

find a record unless REGNUM = 1 and BRANCHNUM = 0.

8-16

1 2 ... 164 165 166 167 168 169 170 171 172 173 174 ... 361 362

Brak uwag

Hp Integrity NonStop J-Series Instrukcja Użytkownika Strona 169