Client 3Query Processing | Using PostgreSQL with Python

Table of contents:

Client 4An Interactive Query Processor

You now have most of the pieces that you need to build a general-purpose query processor within a web browser. Our next client simply prompts the user for a SQL command, executes the command, and displays the results.

If you want to try this on your own web server, be sure that you understand the security implications. If you follow the examples in this chapter, your PHP script will use a hard-coded username to connect to PostgreSQL. Choose a user with very few privileges. In fact, most PHP/PostgreSQL sites should probably define a user account specifically designed for web access. If you're not careful, you'll grant John Q. Hacker permissions to alter important data.

We'll start out with a simple script and then refine it as we discover problems.

First, you need an HTML page that displays a welcome and prompts the user for a SQL command. Listing 15.16 shows the client4.html document.

Listing 15.16. client4.html

2 3

Part I: General PostgreSQL Use

Introduction to PostgreSQL and SQL

Working with Data in PostgreSQL

PostgreSQL SQL Syntax and Use

Performance

Part II: Programming with PostgreSQL

Introduction to PostgreSQL Programming

Extending PostgreSQL

PL/pgSQL

The PostgreSQL C APIlibpq

A Simpler C APIlibpgeasy

The New PostgreSQL C++ APIlibpqxx

Embedding SQL Commands in C Programsecpg

Using PostgreSQL from an ODBC Client Application

Using PostgreSQL from a Java Client Application

Using PostgreSQL with Perl

Using PostgreSQL with PHP

Using PostgreSQL with Tcl and Tcl/Tk

Using PostgreSQL with Python

Npgsql: The .NET Data Provider

Other Useful Programming Tools

Part III: PostgreSQL Administration

Introduction to PostgreSQL Administration

PostgreSQL Administration

Internationalization and Localization

Security

Replicating PostgreSQL Data with Slony

Contributed Modules

Index