Book Image

Developing Robust Date and Time Oriented Applications in Oracle Cloud

By : Michal Kvet
Book Image

Developing Robust Date and Time Oriented Applications in Oracle Cloud

By: Michal Kvet

Overview of this book

Proper date and time management is critical for the development and reliability of Oracle Databases and cloud environments, which are among the most rapidly expanding technologies today. This knowledge can be applied to cloud technology, on premises, application development, and integration to emphasize regional settings, UTC coordination, or different time zones. This practical book focuses on code snippets and discusses the existing functionalities and limitations, along with covering data migration to the cloud by emphasizing the importance of proper date and time management. This book helps you understand the historical background and evolution of ANSI standards. You’ll get to grips with data types, constructor principles, and existing functionalities, and focus on the limitations of regional parameters and time zones, which help in expanding business to other parts of the world. You’ll also explore SQL injection threats, temporal database architecture, using Flashback Technology to reconstruct valid database images from the past, time zone management, and UTC synchronization across regions. By the end of this book, you’ll be able to create and manage temporal systems, prevent SQL injection attacks, use existing functionalities and define your own robust solutions for date management, and apply time zone and region rules.
Table of Contents (26 chapters)
1
Part 1: Discovering Oracle Cloud
4
Part 2: Understanding the Roots of Date and Time
7
Part 3: Modeling, Storing, and Managing Date and Time
12
Part 4: Modeling Validity Intervals
17
Part 5: Building Robust and Secure Temporal Solutions
20
Part 6: Expanding a Business Worldwide Using Oracle Cloud

Understanding the usage of the ROUND function

The ROUND function returns a DATE value rounded to a specific granularity. It takes two parameters. The first parameter (input_date) is mandatory and specifies the DATE value to be rounded. The rounded unit is defined by the second parameter (format). The second parameter is optional. The default value has day precision. Thus, if the value for the second parameter is not stated, the input date is rounded to the nearest day.

The syntax of the ROUND function is as follows:

ROUND (<input_date> [, <format>])

The following code snippets show examples of the ROUND function’s usage related to the DATE value’s management. The value is rounded down by the day precision specified. As it reflects the morning hours, the returned value is 26.01.2022 00:00:00:

select ROUND(TO_DATE('26.1.2022 10:15:22',
                 ...