Program Control Statements

The program control statements define search criteria that limit matching to a particular range of records and to portions of the record. This topic lists the program control statements supported by MFJMATCH.

KEY = ( start , length )

Defines a key field for use by FROMKEY and TOKEY program control statements. This statement can only occur once. The parameters are:

start: The position in the record at which the key starts.
length: The length of the key.

For VSAM keyed files, the KEY defaults to the actual key, although, as the files are processed sequentially, any field can be defined as the key for the purpose of specifying a range for record matching.

INCLUDE

Compare records only in the ranges defined by FROMKEYTOKEY or FROMRECCOUNT.

SKIP and INCLUDE are mutually exclusive.

IGNORE

Ignore records only in the ranges defined by FROMKEYTOKEY or FROMRECCOUNT.

SKIP and INCLUDE are mutually exclusive.

FROMKEY = ' value1 ' TOKEY = ' value1 '

Defines a range of records. value1 specifies the first record in the range, while value2 specifies the last record in the range. Hexadecimal values can be specified as x ' hhhhhh ' , where hhhhhh is a hexadecimal number.

FROMREC = recnum COUNT = count

Defines a range of record numbers, from record number x for the next y records.

FD = start , length

Defines a field to be ignored when comparing records. Used with INCLUDE only.

Example of Program Control Statements

In the following example:

The key field is defined as being the first ten bytes of the record
Records in the ranges AAAAAAAAAA to BBBBBBBBBB and WWWWWWWWW to ZZZZZZZZZZ are compared
Positions 11 to 15 and 21 to 25 are ignored in the second range

//SYSIN DD *
 KEY=(1,10)
 INCLUDE FROMKEY='AAAAAAAAAA' TOKEY='BBBBBBBBBB'
 INCLUDE FROMKEY='WWWWWWWWWW' TOKEY='YYYYYYYYYY'
 FD=(11,5)
 FD=(21,5)