Download Object-Oriented Database Programming by Suad Alagić PDF

By Suad Alagić

ISBN-10: 1461235189

ISBN-13: 9781461235187

ISBN-10: 1461281377

ISBN-13: 9781461281375

The significant subject of this e-book is the mixing of knowledge and programming languages and the linked methodologies. To my wisdom, this can be the 1st booklet on smooth programming languages and programming meth­ odology committed solely to database program environments. whilst, it's written with the aim of reconciling the relational and object-oriented techniques to database administration. one of many purposes that prompted my selection to put in writing this e-book is my dissatisfaction with the truth that the prevailing books on programming technique and the linked strategies, concepts, and programming language notation are mostly according to mathematical difficulties and math­ ematically orientated algorithms. As such, they offer the impact that glossy software buildings, linked thoughts, and methodologies, to not converse of the formal ones, are appropriate basically to difficulties of that kind. even supposing vital, such difficulties are of constrained applicability and scale. this doesn't practice to books within which modem suggestions, innovations, methodologies, and programming language notation are utilized to platforms programming. yet, nevertheless, this doesn't reveal that during totally application-oriented problems-those within which sleek laptop tech­ nology is most generally used-modern programming method is simply as very important. This publication is intended to be a step towards supplying a extra convincing help of this kind of declare and, hence, is predicated fullyyt on universal, what one may well name business-oriented, difficulties during which database know-how has been effectively used.

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Extra resources for Object-Oriented Database Programming

Example text

An}), denote with R[XY] the projection of the relation R over the attributes XUY. A functional dependency X-V exists in the relation R(Al,A2, ... ,An) if and only if R[XY] is in fact a function R[X]-R[Y] for every moment of time. If Y < = X, then this condition trivially holds so that such a functional dependency is called trivial. This means that, whenever xy and xy' are tuples of the relation R[XY] then, in fact, y = y' holds. This is precisely the condition that says R[XY] is a function R[X]-R[Y].

In spite of this restriction, which is dictated by dataintegrity requirements, it is still possible to specify update actions that require relational joins. That is accomplished by nesting the FOREACH statements, as in the following example: Example. Sc. degree who are leaders of their projects and whose customer is NSF. FOREACH p IN project WHERE p. ") DO e. 1 END END 48 1 Data and Actions 6 Arrays The type definition TYPE ArrayType = ARRAY SimpleType OF Type specifies a new type, ArrayType, whose elements are arrays of elements of Type indexed by elements of SimpleType.

A subrange type introduced in such a manner inherits the operators from its base type. 256] The following relational operators are applicable to all of the above types: < > < equality, inequality, less than, 24 1 Data and Actions > <= >= greater than, less than or equal, and greater than or equal. A record type is a structured type that has a fixed number of possibly different component types specified in the definition of such a type. Components of a record are called attributes. The definition of a record type specifies for each attribute its type and an identifier that denotes it.

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