NexJ Express Connecting to PostgreSQL

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Revision as of 20:19, 9 December 2010 by Minooz (talk | contribs) (STEPS for Connection)
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PostgreSQL Adapter for NexJ - Create Test Environment

1- Setup the postgresql-connection

For testing the connection, the 'PostgreSQLAdapterTest.java' is being used.

- TODOs

- Files to Modify

- STEPS for Connection

Installed the JDBC3 Postgresql Driver, Version 9.0-801 and added it to the libraries in JDK
The driver class which is being used for NexJ Express Model is: org.postgresql.xa.PGXADataSource
The driver is loaded from RelationalDatabaseFragment.java and RelationalDatabase.java
Metadata is loaded from the particular driver
   /* MySQLAdapterTest.java */
      try
      {
         s_metadata = loadMetadata(ADAPTER_NAME);
      }

   /* SQLDataTest.java */
   protected static Metadata loadMetadata(String sAdapter)
   {
      Properties props = SysUtil.getConfigProperties();  // sets DEFAULT_CONFIG_URL = '/' + NAMESPACE + "/default.config"
      props = new Properties(props);
      props.setProperty(XMLMetadataLoader.CONNECTIONS_URL_PROPERTY, "/nexj/" + sAdapter.toLowerCase(Locale.ENGLISH) + ".connections");  // sets the properties to postgresql.connection
After all properties are loaded, it creates the connection through Connection Factory files.

Modifications

2- Create a PostgreSQL database through some scripts

Through the process in postgresql_setup.sql, the database was created, initialized and tested:
A database called 'test is created in PostgreSQL : CREATE DATABASE test
To create a user along with password: CREATE USER test WITH PASSWORD 'test';
Login to the database 'test' with username 'test': psql -U test test
Create a Schema called 'test' inside the database 'test' with particular owner 'test': CREATE SCHEMA test AUTHORIZATION test;
Create a table called 'Mutex' with primary key: CREATE TABLE test.Mutex(id INT PRIMARY KEY);
Insert a value into the primary key: INSERT INTO test.Mutex(id) VALUES (1);