JDBC Tutorials - Herong's Tutorial Examples - v3.12, by Dr. Herong Yang
Derby - Looking Up ClientDataSource Objects on File System
This section describes how to lookup a Derby JDBC ClientDataSource object in the file system using JNDI File System Service Provider.
Once the my CliendDataSource is stored on the file system through the JNDI directory service, I can get it back any time I need to create a connection to the Derby Network Server. What I need to do is:
I wrote the following sample program to retrieve my ClientDataSource object from the file system using the directory service via JNDI:
/* DerbyJndiLookup.java * Copyright (c) HerongYang.com. All Rights Reserved. */ import java.util.*; import java.sql.*; import javax.sql.*; import javax.naming.*; public class DerbyJndiLookup { public static void main(String [] args) { Connection con = null; try { // Starting the Directory service Hashtable env = new Hashtable(); env.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.fscontext.RefFSContextFactory"); env.put(Context.PROVIDER_URL, "file:/local/fscontext"); Context ctx = new InitialContext(env); // Looking up the DataSource object DataSource ds = (DataSource) ctx.lookup("DerbyTestDB"); // Getting a connection object con = ds.getConnection(); // Running a query Statement sta = con.createStatement(); ResultSet res = sta.executeQuery( "SELECT * FROM HY_Address"); System.out.println("List of Addresses: "); while (res.next()) { System.out.println( " "+res.getInt("ID") + ", "+res.getString("StreetName") + ", "+res.getString("City")); } res.close(); sta.close(); con.close(); } catch (Exception e) { System.err.println("Exception: "+e.getMessage()); } } }
Here is the output of compilation and execution of the program:
herong> java -cp .;derbyclient.jar;fscontext.jar;providerutil.jar \ DerbyJndiLookup List of Addresses: 1, 5 Baker Road, Bellevue 2, 25 Bay St., Hull 3, 251 Main St., W. York
Table of Contents
JDBC (Java Database Connectivity) Introduction
Installing and Running Java DB - Derby
►Derby (Java DB) JDBC DataSource Objects
Derby - Connection with DataSource Objects
Derby - Using ClientDataSource Directly
Installing JNDI File System Service Provider
Derby - Storing ClientDataSource Objects on File System
►Derby - Looking Up ClientDataSource Objects on File System
What Happens If Client JDBC DataSource JAR Is Missing?
Java DB (Derby) - DML Statements
Java DB (Derby) - ResultSet Objects of Queries
Java DB (Derby) - PreparedStatement
MySQL JDBC Driver (MySQL Connector/J)
MySQL - Reference Implementation of JdbcRowSet
MySQL - JBDC CallableStatement
MySQL CLOB (Character Large Object) - TEXT
MySQL BLOB (Binary Large Object) - BLOB
Oracle Express Edition Installation on Windows
Oracle - Reference Implementation of JdbcRowSet
Oracle - JBDC CallableStatement
Oracle CLOB (Character Large Object) - TEXT
Oracle BLOB (Binary Large Object) - BLOB
Microsoft SQL Server Express Edition
Microsoft JDBC Driver for SQL Server
Microsoft JDBC Driver - Query Statements and Result Sets
Microsoft JDBC Driver - DatabaseMetaData Object
Microsoft JDBC Driver - DDL Statements
Microsoft JDBC Driver - DML Statements
SQL Server - PreparedStatement
SQL Server CLOB (Character Large Object) - TEXT
SQL Server BLOB (Binary Large Object) - BLOB
JDBC-ODBC Bridge Driver - sun.jdbc.odbc.JdbcOdbcDriver
JDBC-ODBC Bridge Driver - Flat Text Files
JDBC-ODBC Bridge Driver - MS Access
JDBC-ODBC Bridge Driver - MS SQL Server
Summary of JDBC Drivers and Database Servers