Book Image

PostgreSQL Development Essentials

By : Manpreet Kaur, Baji Shaik
Book Image

PostgreSQL Development Essentials

By: Manpreet Kaur, Baji Shaik

Overview of this book

PostgreSQL is the most advanced open source database in the world. It is easy to install, configure, and maintain by following the documentation; however, it’s difficult to develop applications using programming languages and design databases accordingly. This book is what you need to get the most out of PostgreSQL You will begin with advanced SQL topics such as views, materialized views, and cursors, and learn about performing data type conversions. You will then perform trigger operations and use trigger functions in PostgreSQL. Next we walk through data modeling, normalization concepts, and the effect of transactions and locking on the database. The next half of the book covers the types of indexes, constrains, and the concepts of table partitioning, as well as the different mechanisms and approaches available to write efficient queries or code. Later, we explore PostgreSQL Extensions and Large Object Support in PostgreSQL. Finally, you will perform database operations in PostgreSQL using PHP and Java. By the end of this book, you will have mastered all the aspects of PostgreSQL development. You will be able to build efficient enterprise-grade applications with PostgreSQL by making use of these concepts
Table of Contents (17 chapters)
PostgreSQL Development Essentials
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface

Making database connections to PostgreSQL using Java


As this book is intended to give you the basics, we will start with simple Java code that retrieves data from the database. For the Java code, we should have Java installed on the machine, and we need a PosgreSQL java driver to connect it to the database.

Here is the sample code:

import java.sql.Connection; 
import java.sql.DriverManager; 
import java.sql.Statement; 
import java.sql.ResultSet; 
import java.sql.SQLException; 
 
 
public class JavaSelect { 
  public static void main(String[] args) throws     
  ClassNotFoundException, SQLException{ 
    Class.forName("org.postgresql.Driver"); 
    Connection con =   
    DriverManager.getConnection
    ("jdbc:postgresql://ip:port/dbname","user","password"); 
    Statement stmt = con.createStatement(); 
    //Queries 
    ResultSet rs   = stmt.executeQuery("select * from table"); 
    while (rs.next()) { &...