Download Object-Oriented Database Programming by Suad Alagić PDF

By Suad Alagić

The significant subject of this booklet is the mixing of information and programming languages and the linked methodologies. To my wisdom, this can be the 1st publication on smooth programming languages and programming meth­ odology dedicated fullyyt to database software environments. while, it's written with the target of reconciling the relational and object-oriented methods to database administration. one of many purposes that prompted my choice to write down this e-book is my dissatisfaction with the truth that the prevailing books on programming technique and the linked techniques, strategies, and programming language notation are principally in response to mathematical difficulties and math­ ematically orientated algorithms. As such, they provide the influence that sleek software constructions, linked thoughts, and methodologies, to not communicate of the formal ones, are appropriate in basic terms to difficulties of that kind. even supposing vital, such difficulties are of restricted applicability and scale. this doesn't observe to books within which modem strategies, suggestions, methodologies, and programming language notation are utilized to platforms programming. yet, having said that, this doesn't reveal that during fullyyt application-oriented problems-those during which glossy computing device tech­ nology is most generally used-modern programming method is simply as vital. This ebook is intended to be a step towards delivering a extra convincing aid of this kind of declare and, hence, is predicated completely on universal, what one may well name business-oriented, difficulties within which database expertise has been effectively used.

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An(e», where we require the following condition for the two different entities e I and e2 of the type E: (AI,A2, ... ,An)(el) < > (Al,A2, ... ,An)(e2). The above condition states that (Al,A2, ... ,An) is an injective function E-TI x T2 x ... Tn. This condition will be satisfied if there exists j (j = 1,2, ... ,n) such that Aj(el) -- > Aj(e2). That is, different entities are represented by different tuples. Tuples are different if they have different values of at least one attribute. 22 1 Data and Actions A data type is a set of values together with actions that may be performed upon them.

An} and Y = {Al,A2, ... ,An}/X. By permuting the attributes of R, we can represent R(A I ,A2, ... ,An) as R(X, V). The result of the operation of projection of the relation R over the attributes X is denoted as R[X] and defined as (i) R[X] = {x : there exists y such that (x,y) in R(X, V)}. 4 The Relational Model of Data 33 Example. Given a relation EMPLOYEE(EMPLOYEE# ,NAME,JOB,DEPARTMENT#) the projection EMPLOYEE[DEPARTMENT# ,JOB] represents a survey of jobs in particular departments. Let R(AI ,A2, ...

Elements of this new type are denoted with identifiers ci (i = 1,2'00' ,n). ,n. The standard type Boolean is also an enumeration type predefined as follows: TYPE Boolean = (false ,true) (3) Subranges Given a simple, ordered type (the base type) such as Integer, Cardinal, or Char, or an enumeration type, it is possible to define a new type as a range of elements of the base type. 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.

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