Query Case Studies in Object-Oriented Databases

Introduction

Object-oriented databases (OODBs) store data in objects, similar to how data is represented in programming languages. This lesson focuses on practical query case studies that illustrate how to efficiently access and manipulate data within OODBs.

Case Study 1: Employee Management

class Employee {
    String name;
    String position;
    double salary;

    // Constructor
    Employee(String name, String position, double salary) {
        this.name = name;
        this.position = position;
        this.salary = salary;
    }
}

List highEarners = employeeDB.query(
    "SELECT * FROM Employee WHERE salary > 50000"
);

Case Study 2: Library Management

class Book {
    String title;
    String author;
    String ISBN;

    // Constructor
    Book(String title, String author, String ISBN) {
        this.title = title;
        this.author = author;
        this.ISBN = ISBN;
    }
}

List janeBooks = libraryDB.query(
    "SELECT * FROM Book WHERE author = 'Jane Doe'"
);

Best Practices

• Use indexing for frequently queried fields to enhance performance.
• Minimize data retrieval by selecting only necessary fields.
• Implement caching strategies to reduce database load.
• Regularly review and optimize queries for efficiency.

FAQ