By Dr. Hiroshi Ishikawa (auth.)
Computer technology Workbench is a monograph sequence with the intention to offer you an in intensity operating wisdom of present advancements in laptop know-how. each quantity during this sequence will take care of an issue of significance in desktop technological know-how and complex on the way you your self can construct platforms concerning the most topic. it is possible for you to to advance a number of structures, together with software program instruments, special effects, laptop animation, database administration structures, and computer-aided layout and production platforms. machine technology Workbench represents a big new contribution within the box of useful computing device expertise. Tosiyasu L. Kunii Preface The aim of this e-book is to offer concrete solutions to questions equivalent to what item orientated databases are, why they're wanted, how they're applied, and the way they're utilized, by way of describing a examine prototype object-oriented database procedure known as Jasmine. that's, this e-book is aimed toward making a constant view to object-oriented databases. The contents of this publication are at once in line with the result of the Jasmine undertaking performed at Fujitsu Laboratories, Ltd. The booklet is a refined model of my doctoral dissertation, such as study papers which i've got authored and published.
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Extra resources for Object-Oriented Database System: Design and Implementation for Advanced Applications
They include manipulation and predicate functions for section or join operators, order and range functions for index insertion and search, and hash functions for hash-based operators such as hash join and set-difference. The data management subsystem provides no query parser or optimizer. It is just an executer of three-level operators: relational operators, tuple operators, and storage operators. All these operators are open to the user. The relational operators extend relational algebra by allowing the user to operate on nested relations and to specify userdefined functions.
To reduce a series of more than two 33 SINGIETON ACCESS AND OBJECT VARIABLES 35 attributes in the target part, we use "join(restrict(C, P), Cl, Al=Oid)" instead of "restrict(C, P)" in rule (6). Similarly, to reduce a series of more than two attributes in the condition part, we use "join(restrict(C, P), Cl, Al=Oid)" instead of "restrict(C, P)" in rule (22). For a target list of more than two expressions. we use "project«Al. A2»)" instead of "project«AJ))" in rule (12). Generally, logical operations on the above conditions such as "and" and "or" lead to set operations on queries such as "intersection" and "union", although simple conjunction of the conditions can be described by merging the above rules.
Procedural-attribute(parml. displayO where PATIENT. Condition == "serious" Assuming that we operate on objects set-theoretically in a setting other than Jasmine, we then have to retrieve a set of objects and scan and operate on each object in an iteration construct. In contrast, Jasmine makes this type of iteration implicit and iteration variable declaration unnecessary and allows the user to compactly specify a query without knowing the details. This increases productivity in application development.