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94 <strong>File</strong> <strong>Management</strong> V4R5<br />
Selecting records by record keys (FROMKEY and TOKEY<br />
Parameters)<br />
Note: You can use this parameter on the CPYF command only.<br />
You can specify record keys to copy only from a keyed database file. You can copy<br />
records:<br />
v From a specified key value (FROMKEY parameter) to a specified key value<br />
(TOKEY parameter) OR<br />
v Until a specified number of records (NBRRCDS parameter) is reached (see<br />
“Selecting a specified number of records (NBRRCDS Parameter)” on page 98<br />
If the command reaches the end of the file before it reaches the specified ending<br />
key value or number of records, the copy completes normally.<br />
If no record in the from-file member has a key that is a match with the FROMKEY<br />
value, but there is at least one record with a key greater than the specified value,<br />
the first record copied is the first record with a key greater than the FROMKEY<br />
value. If the specified key value is greater than any record in the member, the<br />
command sends an error message and does not copy the member.<br />
You can specify *BLDKEY on the FROMKEY and TOKEY parameters to use a list<br />
of character and numeric values in their natural display form for the fields in a<br />
key. The command converts each element to the corresponding key field data type.<br />
The command then provides the composite key value (a key that is comprised of<br />
more than one field) to the database.<br />
If you specify fewer values than the complete database key contains, the command<br />
builds a partial key and passes it to the database. If you specify more values than<br />
the database key contains, an ending error occurs. The command always applies<br />
values to the consecutive fields that are in the extreme left of the key so that it is<br />
impossible to skip key fields.<br />
The command pads character fields on the right with blanks. The command<br />
adjusts numeric fields to the implied decimal point in the key field with the correct<br />
zero padding.<br />
All regular rules for specifying numeric fields in an external character format<br />
apply. The command does not allow a floating-point value of *NAN (Not a<br />
Number).<br />
See “Example: build-key function” on page 96 and “Example: using FROMKEY and<br />
TOKEY” on page 96 for specific coding examples.<br />
It is also important to understand “Key string comparisons made by the copy<br />
operation” on page 95 in order to interpret various warning messages.<br />
Note: If you use record keys to select records, you cannot use relative record<br />
numbers (FROMRCD/TORCD parameters) to select records on the same<br />
CPYF command.<br />
You should not specify COMPRESS(*NO) when selecting records by record key<br />
from a keyed physical file. Because the keyed access path of a file does not contain<br />
deleted records, the copy command never copies them, so the compression is<br />
automatic.
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