WRITE WORK FILE

WRITE WORK [FILE]  work-file-number   [VARIABLE]   operand1  

This document covers the following topics:

For an explanation of the symbols used in the syntax diagram, see Syntax Symbols.

Related Statements: DEFINE WORK FILE | READ WORK FILE | CLOSE WORK FILE | DOWNLOAD PC FILE

Belongs to Function Group: Control of Work Files / PC Files

Function

The WRITE WORK FILE statement is used to write records to a physical sequential work file.

This statement can only be used within a program to be executed under Com-plete, CICS, or TSO, or in batch mode. Appropriate JCL or system commands must be executed to allocate the work file. For further information, see the Operations documentation. For information on work file assignments, see profile parameter WORK in the Parameter Reference.

It is possible to create a work file in one program or processing loop and to read the same file in a subsequent independent processing loop or in a subsequent program using the READ WORK FILE statement.

Note:
For Unicode and code page support, see Work Files and Print Files on Mainframe Platforms in the Unicode and Code Page Support documentation.

Syntax Description

Operand Definition Table:

Operand Possible Structure Possible Formats Referencing Permitted Dynamic Definition
operand1 C S A G  N A U N P I F B D T L C G   yes no

Note:
Neither Format C nor Format G is valid for Natural Connection.

Syntax Element Description:

Syntax Element Description
work-file-number
Work File Number:
Specifies the work file number (as defined to Natural).

The work file number is either:

  • a numeric constant in the value range 1:32 or

  • a numeric variable of type B/N/P/I defined with a CONST clause which assigns a value in range 1:32. Precision digits for type N/P are not allowed.

VARIABLE
Variable Entry:

It is possible to write records with different fields to the same work file with different WRITE WORK FILE statements. In this case, the VARIABLE entry must be specified in all WRITE WORK FILE statements. The records on the external file will be written in variable format. Natural will write all output files as variable-blocked (unless you specify a record format and block size in the execution JCL).

When the operand list includes a dynamic variable (that could change in size for different executions of the WRITE WORK FILE statement), the VARIABLE entry must be specified in all WRITE WORK FILE statements.

Variable Index Range:

When writing an array to a work file, you can specify a variable index range for the array. For example: 

WRITE WORK FILE work-file-number VARIABLE #ARRAY (I:J)
operand1
Fields to Be Written:

With operand1 you specify the fields to be written to the work file. These fields may be database fields, user-defined variables, system variables and/or fields read from another work file using the READ WORK FILE statement.

An array may be referenced completely or partially to select the occurrences that are to be written to the work file.

Group Operands to be Written:

A group may be referenced using the group name. All fields belonging to the referenced group will be written to the work file, the sequence is determined by the sequence of the fields in the group. Fields resulting from a redefinition of the referenced group are not written to the work file. If the referenced group is defined as an array, the individual fields of the group are written to the work file as arrays in the definition sequence.

For the group definition

1 GROUP1 (1:3)
    2 FIELD1 (A2) 
    2 FIELD2 (A3)
  1 REDEFINE GROUP1
    2 FIELD3 (A15)

the statement

WRITE WORK FILE 1 GROUP1(*)

is equivalent to

WRITE WORK FILE 1 GROUP1.FIELD1(*) GROUP1.FIELD2(*)

The statement

WRITE WORK FILE 1 GROUP1.FIELD3

is equivalent to

WRITE WORK FILE 1 GROUP1.FIELD1(1) GROUP1.FIELD2(1)
                    GROUP1.FIELD1(2) GROUP1.FIELD2(2)
                    GROUP1.FIELD1(3) GROUP1.FIELD2(3)

External Representation of Fields

Fields written with a WRITE WORK FILE statement are represented in the external file according to their internal definition. No editing is performed on the field values.

For fields of format A and B, the number of bytes in the external file is the same as the internal length definition as defined in the Natural program. No editing is performed and a decimal point is not represented in the value.

For fields of format N, the number of bytes on the external file is the sum of internal positions before and after the decimal point. The decimal point is not represented on the external file.

For fields of format P, the number of bytes on the external file is the sum of positions before and after the decimal point, plus 1 for the sign, divided by 2, rounded upward to a full byte.

Note:
No format conversion is performed for fields that are written to a work file.

Examples of field representations:

Field Definition Output Record
#FIELD1 (A10) 10 bytes
#FIELD2 (B15) 15 bytes
#FIELD3 (N1.3) 4 bytes
#FIELD4 (N0.7) 7 bytes
#FIELD5 (P1.2) 2 bytes
#FIELD6 (P6.0) 4 bytes

Special Considerations for System Functions

For the special considerations that apply when WRITE WORK FILE is used for the Natural system function AVER, NAVER, SUM or TOTAL, see Format/Length Requirements for AVER, NAVER, SUM and TOTAL in the System Functions documentation.

Handling of Large and Dynamic Variables

Work File Type Handling
UNFORMATTED Work file type UNFORMATTED can be used to write variables whose size exceeds the maximum record length. See also Work File Access With Large and Dynamic Variables.
FORMATTED A dynamic variable is written in its currently defined length (including length 0).

Example

** Example 'WWFEX1': WRITE WORK FILE                                    
************************************************************************
DEFINE DATA LOCAL                                                       
1 EMPLOY-VIEW VIEW OF EMPLOYEES                                         
  2 PERSONNEL-ID                                                        
  2 NAME                                                                
END-DEFINE                                                              
*                                                                       
FIND EMPLOY-VIEW WITH CITY = 'LONDON'                                   
  WRITE WORK FILE 1                                                     
        PERSONNEL-ID NAME                                              
END-FIND                                                                
*                                                                       
END