Uniface accesses databases using intelligent drivers. These are divided roughly into 2 types:
Record level drivers consist entirely of fixed length fields. A record may look like:
ARTHUR……………..BARRETT………………MARCH.HARE……………
Field level drivers, by understanding each field as a separate object can represent the same information:
ARTHUR,BARRETT,MARCH HARE
In this sense the UD7 driver is a field level driver. It relies on Uniface’s ability to match records and maintain referential integrity. Internally it uses Physical Record Addresses (PRA’s) or Primary Keys to locate occurrences/records from the Uniface hitlist. A PRA of 20 corresponds to record number 20.
Use of the XML-Data/UD7 driver
The UD7 driver is designed to work with Microsoft Internet Explorer 5, and other XML tools. There are many options that can configure it to a particular task. These are set using the USYS$UD7_PARAMS assignment file setting.
Retrieve profiles
This section discusses the following instructions:
The where clause
The order by qualifier
The u_where clause
The selectdb instruction
where clause
The where clause is not supported.
order by qualifier
This is supported by Uniface for both ascending and descending ordering.
u_where clause
Uniface handles the u_where clause in all circumstances.
selectdb instruction
Uniface handles the selectdb instruction in all circumstances.
[ENTITIES] Section of Assignment File
Entity Mapping
This section explains how you can map entity names (filenames) using the [ENTITIES] section in a suitable assignment file.
Examples
To rename the entity (or filename if using a driver like CSV/UD8):
[ENTITIES]
colour.bridalwcolour.*
Copying data from one driver to another using the command line
IDF Copy Facility
This section explains how you can copy data using the UD7 driver and IDF command line options which you can set in the IDF command dialog box.
Examples
To copy from the default database to CSV/UD8:
/int=1000 /cpy def:colour.bridal ud7:
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