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Top Forums Shell Programming and Scripting how to fetch substring from records into another file Post 302220756 by aigles on Friday 1st of August 2008 01:45:39 PM
Old 08-01-2008
The answer depends of the key length (first column of file2).
If keys are fixed length, there is no problem to invert the logic.
Code:
Read file1: Memorize each header and datas records in an array indexed by the key.
Read file2:For each record, if the record had been memorized (key is an index in the array) proceed extraction from memorized datas.

If keys are variable length, the header and records from file1 will be memorized in a array indexed by record number, we can't use another index because we don't know what part of the record is the key.
For each extraction specified in file 2, we will scan sequentially the array until we found the right record (more time consuming).

Jean-Pierre.
 

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PX_GET_RECORD(3)														  PX_GET_RECORD(3)

px_get_record - Returns record of paradox database

SYNOPSIS
array px_get_record (resource $pxdoc, int $num, [int $mode]) DESCRIPTION
PARAMETERS
o $pxdoc - Resource identifier of the paradox database as returned by px_new(3). o $num - The record number is an artificial number counting records in the order as they are stored in the database. The first record has number 0. o $mode - The optional $mode can be PX_KEYTOLOWER or PX_KEYTOUPPER in order to convert the keys of the returned array into lower or upper case. If $mode is not passed or is 0, then the key will be exactly like the field name. The element values will contain the field values. NULL values will be retained and are different from 0.0, 0 or the empty string. Fields of type PX_FIELD_TIME will be returned as an integer counting the number of milliseconds starting at midnight. A timestamp ( PX_FIELD_TIMESTAMP) and date ( PX_FIELD_DATE) are floating point respectively int values counting milliseconds respectively days starting at the beginning of julian calendar. Use the functions px-timestamp2string(3) and px-date2string(3) to convert them into a character representation. RETURN VALUES
Returns the $num'th record from the paradox database. The record is returned as an associated array with its keys being the field names. SEE ALSO
px_retrieve_record(3). PHP Documentation Group PX_GET_RECORD(3)
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