Easytrieve Guide for Mainframe Programmers(3 of 20)

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EZT+ LIBRARY

FILE STATEMENT

All files and their associated fields (including any Working Storage items) used in your EZT+ program MUST be described in the library section BEFORE they are used in your program.

The FILE STATEMENT is used to define the beginning of your FILE (or FILES)            and the field names you are going to be processing.

The FILE STATEMENT initiates your EZT+ logic and follows the / / SYSIN  JCL statement.

The syntax for the FILE STATEMENT is . . . . . . .

/ / SYSIN         DD    *

FILE           file-name  VS UPDATE

FILE:  This is a reserved keyword that marks the beginning of your

FILE                            DEFINITION.

file-name:  This is a 1 – 8 character name describing the file that you wish to                                               define.

The file-name used MUST be unique in your program.

The file-name MUST also correspond to the file as it is defined in the execution JCL.

VS:  indicates that this is a VSAM file

UPDATE:  indicates that the designated VSAM file can be updated.

NOTE: There are additional parameters available with the FILE STATEMENT, they will be discussed when they are applicable.

NOTE: See additional FILE definition requirements in the sections on       SUMMARY FILES and the SORT ACTIVITY.

 FIELD DEFINITION

An EZT+ field definition statement has four basic parts.  Each part is separated     by at least one space.  If more than one definition is on a line, they must be             separated by a period and a space.  Those basic parts are the FIELD NAME, the STARTING LOCATION, the FIELD LENGTH and the DATA FORMAT

FIELD NAME

*      A field name which is 1 – to – 40 characters long and unique in a                                                   particular file

STARTING LOCATION

*      The beginning location of the field relative to the first position of the                                           record (for working storage, a W or S is placed in this position)

*      Start-location can be explicitly defined relative to position one in the                                           record:

FILE  file-name

NAME                          1        17 (NAME begins in position 1)

ADDRESS     18        37 (ADDRESS begins in pos 18)

PAY-NET       55        10 (PAY-NET begins in pos 55)

  •   The start-location can be relatively defined as immediately following the end of the previously defined field:

FILE  file-name

FILLER1        *            5

NAME                        *          20              |   All field-names MUST

FILLER2        *            5               |   be defined when file

ADDRESS     *          20              |   is defined in this

FILLER3        *            5               |   manner.  This would include

PAY-NET       *          20                    FILLER also.

FIELD LENGTH

*      The length of the field in bytes

*      The length of the field has been added to our example below.

*      EZT+ permits the programmer to define a segment of a data item if they so desire, for instance; if they only wished to process fifteen (15) bytes of the NAME field they could define the length as 15, rather than 33 bytes.

FILE  file-name

NAME         17        15

ADDRESS  37        33

PAY-NET    90          4

DATA FORMAT

*      The type of data  (A,  N,  P,  U,  or B)

*  A  –  Alphabetic or alphanumeric

*  N  –  Zoned decimal

*  P  –   Packed decimal

*  U  –  Unsigned packed decimal

*  B  –  Binary

  •      The EZT+ programmer defines the DATA Format of the data item they are defining by adding the appropriate character AFTER the record length parameter.

FILE  file-name

NAME                     17        33        A

ADDRESS              37        33        A

PAY-NET                90          4        P

The maximum size that is permitted for each DATA FORMAT is shown below . . . . .

Data Format        Maximum Length                   Number of Decimal

Code                         (bytes)                                    Positions

A                              32,767                                     not valid

N                                     18                                     0  –  18

P                                      10                                     0  –  18

B                                       4                                     0  –  10

U                                       9                                     0  –  18

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Author: Srini

Experienced software developer. Skills in Development, Coding, Testing and Debugging. Good Data analytic skills (Data Warehousing and BI). Also skills in Mainframe.