October 2011
Intermediate to advanced
510 pages
18h 48m
English
book
IBM IMS Version 12 Technical Overview
by Paolo Bruni, Isabelle Bruneel, Angie Greenhaw, Dougie Lawson, Jorge Alberto Luz Ribeiro, Egide Van Aershot
Content preview from IBM IMS Version 12 Technical Overview
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Chapter 3. Database enhancements 107
These command codes should not be used with DL/I calls. They are used by JDBC with Open
Database to provide results comparable to relational.
The JDBC driver uses the new command codes when converting a JDBC call to a DL/I call.
This is done so that the JDBC call returns the same results with an IMS database that it
returns with a relational database. Without these command codes, a search on a range of
root segment keys is done with logic that assumes the roots are in key sequence. A call
qualified on a range of root segment keys attempts to begin the search with the key at the
bottom of the range.
For example, a search for roots with keys >= 1000 and <= 2000 begins by using the partition
selection exit ...
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