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

Investigating the TRUNC function

The TRUNC function, for dealing with DATE type values, removes all parts with smaller granularity than defined. It consists of one obligatory and one optional parameter. The first one is the DATE attribute value (date_val), while the second reflects the granularity (format). If the second parameter is not defined, the default value for the day is used (the time element value will be 00 in that case). Thus, smaller granularity values (day, hours, minutes, and seconds) are removed if the second parameter defines a month. The second parameter value can be DD, MM, YY, HH, or MI. The format unit (the second parameter) can also be Q (quarter), W (week of the month), or WW (week in the year). The syntax of the function is stated in the following code block:

TRUNC(<date_val>, [<format>])

Let’s assume this is the actual time to be set by this value:

The following code shows examples of the TRUNC function’...