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

Composite date and time value

In the preceding sections, date and time values were treated separately. Some database systems, such as MySQL, use this approach by defining two data types—Date and Time data types. A DateTime data type is a combination of both values in a common block. The Date values are placed in the left-most part up to the second fractions. The predefined format is YYYY-MM-DDTHH:MI:SS[.FF]. Second fractions are optional. The T symbol is used to split the date and time values. Version 2019 allows you to omit the delimiter symbol, T. So, all of the following values would be the same: 2022-12-30T15:26:01, 2022-12-3015:26:01, 2022-12-30T15:26:01.00, and 2022-12-3015:26:01.00.

Each day starts and ends at midnight, covered by the values 00:00 and 24:00 to distinguish the timeline positions (start of the day or end of the day). However, the value 24:00 is the same as 00:00 for the consecutive day. Thus, both of the following values express the same point in time...