Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Develop a database broker framework to implement a persistence mechanism for the domain objects involved in the use case dealt with in Question 2.
a. Specify the attribute types, visibility, and operation signatures for the most complex domain object involved in Question 2. (Hint: consider ALL use cases in which the domain object class participates.)
b. Map the information required by the chosen domain object class onto a set of relational database tables in third normal form. Specify the table design.
c. For all the associations that exist for the chosen domain object class, discuss how referential integrity can be maintained.
d. Design ‘persistence layer' classes to support interaction between the object oriented case study application and a relational database.
i. Specify the attributes and operations for these persistence layer classes.
ii. Modify the sequence diagram you developed for Part B to show interactions with the classes of the persistence layer. Also show interactions between the persistence layer and the database.
What is a recovery scheme? An integral part of a database system is a recovery scheme that can restore the database to the reliable state that existed before the failure.
The Third Normal Form (3NF) Even though, transforming a relation that is not in 2NF into a number of relations that are in 2NF take out many of the anomalies, it does not neces
Using Column aliases Example: To print column names as NAME and ANNUAL SALARY SELECT ENAME "NAME", SAL*12 "ANNUAL SALARY" FROM EMP;
Differentiate between natural join and outer join? Natural join is a binary operator which is written as (R * S) where as R and S are relations. The output of the natural join
Every simple attribute of an entity type have a possible set of values that can be attached to it. This is known as the domain of an attribute. An attribute cannot have a value out
Implementation of association as an object Implement as a separate association object, independent of either class, as in Figure. An association object is a group of pairs
The technique of converting the state diagram to code a) Identify all major control paths. Start from initial state; choose a path across the diagram that corresponds to normal
What are the benefits of prepared statements and place holders? Parameter binding operations automatically handle escaping of characters Encourage Statement reuse
What is the use of keyword ISA? The use of keyword ISA is to show that a class is a specialization of another class.
using the invoice table shown below,write the relational schema,draw a dependencies,inclunding all partial and transitive dependencies.assume that the table does not contain repeat
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd