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FIELD
Chapter 2 Program Instructions
Field of Application Statement for creating a single-record buffer for a random file and
dividing the buffer into fields to which string variables are assigned.
Syntax FIELD[#],AS[,AS...]
1 2 1 3 2
# indicates that whatever follows is a number. Optional.
1
2-n
is the number assigned to the file when it was OPENed.
is the number of bytes to be reserved for the string variable
that follows.
1-n is the designation of the string variable, for which space has
been reserved.
Remarks The buffer is divided into fields, each of which is given an individual length
in bytes. A string variable is assigned to each field. This statement does not
put any data in the buffer, it only creates and formats the buffer, allowing you
to place the data by means of LSET and RSET statements.
Before using this statement, consider the maximum number of characters
(incl. space characters) needed for each variable and check that the total does
not exceed the record size given when the file was OPENed (by default 128
bytes).
When a file is CLOSEd, all its FIELD definitions will be lost.
Example This example opens and formats a file buffer for a single record. The buffer
is divided into three fields, with the size of 25, 30 and 20 bytes respectively.
10 OPEN "ADDRESSES" AS #8 LEN=75
20 FIELD#8,25 AS F1$, 30 AS F2$, 20 AS F3$
(Imagine a spreadsheet matrix where the file is the complete spreadsheet, the
records are the lines and the fields are the columns. The buffer can only
contain one such line at the time).
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