[(Object-Oriented Database System: Design and Implementation by Dr. Hiroshi Ishikawa (auth.)

By Dr. Hiroshi Ishikawa (auth.)

Computer technology Workbench is a monograph sequence for you to give you an in­ intensity operating wisdom of present advancements in machine know-how. each quantity during this sequence will care for a subject matter of significance in computing device technology and complex on the way you your self can construct platforms relating to the most subject. it is possible for you to to boost various structures, together with software program instruments, special effects, computing device animation, database administration platforms, and computer-aided layout and production platforms. machine technological know-how Workbench represents a major new contribution within the box of useful laptop expertise. Tosiyasu L. Kunii Preface The target of this ebook is to provide concrete solutions to questions reminiscent of what item­ orientated databases are, why they're wanted, how they're applied, and the way they're utilized, by means of describing a study prototype object-oriented database approach known as Jasmine. that's, this booklet is aimed toward making a constant view to object-oriented databases. The contents of this e-book are without delay in keeping with the result of the Jasmine undertaking carried out at Fujitsu Laboratories, Ltd. The ebook is a refined model of my doctoral dissertation, together with 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 * * )] [Author: Hiroshi Ishikawa] [Jan-2012]

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An» = { I s belongs to S and ai is the value of A i of s} This operator projects attributes of tuples. project-apply (1) project-apply: {T }, (Ai, (fl:T -> TJ), A2, (f2:T -> T2), ... , An, (fn:T -> Tn» -> {} (2) project-apply(S, (Al,fl, A2, f2, ... , An,fn» = { BOOLEAN) -> {T} (2) restrict(S, P ) = {s I s belongs to S and P(s)} This operator returns a set of tuples satisfying a predicate.

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.

A, AI, A2, and A3 denote attribute names. Oid denotes the name of the attribute containing object identifiers. Method denotes method names and aggfunc denotes aggregate function names. P, PI, and P2 denote logical combination of conditions on singleton-valued attributes with no multiple-valued attributes, no methods, and no aggregate functions. Pjoin denotes join predicates; none denotes absence of parameters; v denotes constants; and * denotes all the attributes of an object. 2 MORE FORMAL SEMANTICS 33 We define semantic translation rules for queries in a pattern-directed fashion.

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