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PostgreSQL Server Programming - Second Edition

You're reading from PostgreSQL Server Programming - Second Edition Extend PostgreSQL using PostgreSQL server programming to create, test, debug, and optimize a range of user-defined functions in your favorite programming language

Product type Paperback

Published in Feb 2015

Publisher

ISBN-13 9781783980581

Length 320 pages

Edition 2nd Edition

Tools

PostgreSQL

Concepts

Database Programming

Authors (3):

Dar

Krosing

Jim Mlodgenski

View More author details

Table of Contents (16) Chapters

Preface

1. What Is a PostgreSQL Server?

2. Server Programming Environments FREE CHAPTER

3. Your First PL/pgSQL Function

4. Returning Structured Data

5. PL/pgSQL Trigger Functions

6. PostgreSQL Event Triggers

7. Debugging PL/pgSQL

8. Using Unrestricted Languages

9. Writing Advanced Functions in C

10. Scaling Your Database with PL/Proxy

11. PL/Perl – Perl Procedural Language

12. PL/Tcl – Tcl Procedural Language

13. Publishing Your Code as PostgreSQL Extensions

14. PostgreSQL as an Extensible RDBMS

Index

Chapter 8. Using Unrestricted Languages

You may have noticed, that some of the PLs in PostgreSQL can be declared as untrusted. They all end in the letter u to remind you that they are untrusted each time you use them to create a function. Unrestricted languages allow you to do things that restricted or trusted languages are not allowed to do; for example, interacting with the environment and creating files and opening sockets. In this chapter, we will look at some examples in detail.

This untrustedness brings up many questions:

Does being untrusted mean that such languages are somehow inferior to trusted ones?
Can I still write an important function in an untrusted language?
Will they silently eat my data and corrupt the database?

The answers are no, yes, and maybe respectively. Let's now discuss these questions in order.

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Authors (3)

Dar

Dar

Usama Dar is a seasoned software developer and architect. During his 14 years' career, he has worked extensively with PostgreSQL and other database technologies. He worked on PostgreSQL internals extensively while he was working for EnterpriseDB. Currently, he lives in Munich where he works for Huawei's European Research Center. He designs the next generation of high-performance database systems based on open source technologies, such as PostgreSQL, which are used under high workloads and strict performance requirements.

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Krosing

Krosing

Hannu Krosing is a principal consultant at 2ndQuadrant and a technical advisor at Ambient Sound Investments. As the original database architect at Skype Technologies, he was responsible for designing the SkyTools suite of replication and scalability technology. He has worked with and contributed to the PostgreSQL project for more than 12 years.

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Jim Mlodgenski

Jim Mlodgenski

Jim Mlodgenski is the CTO of OpenSCG, a professional services company focused on leveraging open source technologies for strategic advantage. He was formerly the CEO of StormDB, a database cloud company focused on horizontal scalability. Prior to StormDB, he has held highly technical roles at Cirrus Technology, Inc., EnterpriseDB, and Fusion Technologies. Jim is also a fervent advocate of PostgreSQL. He is on the board of the United States PostgreSQL Association as well as a part of the organizing teams of the New York PostgreSQL User Group and Philadelphia PostgreSQL User Group.

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