/*
This program is a part of the companion code for Core Java 8th ed.
(http://horstmann.com/corejava)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see .
*/
import java.sql.*;
import java.io.*;
import java.util.*;
/**
* This program tests that the database and the JDBC driver are correctly configured.
* @version 1.01 2004-09-24
* @author Cay Horstmann
*/
class TestDB
{
public static void main(String args[])
{
try
{
runTest();
}
catch (SQLException ex)
{
for (Throwable t : ex)
t.printStackTrace();
}
catch (IOException ex)
{
ex.printStackTrace();
}
}
/**
* Runs a test by creating a table, adding a value, showing the table contents, and removing the
* table.
*/
public static void runTest() throws SQLException, IOException
{
Connection conn = getConnection();
try
{
Statement stat = conn.createStatement();
stat.executeUpdate("CREATE TABLE Greetings (Message CHAR(20))");
stat.executeUpdate("INSERT INTO Greetings VALUES ('Hello, World!')");
ResultSet result = stat.executeQuery("SELECT * FROM Greetings");
if (result.next())
System.out.println(result.getString(1));
result.close();
stat.executeUpdate("DROP TABLE Greetings");
}
finally
{
conn.close();
}
}
/**
* Gets a connection from the properties specified in the file database.properties
* @return the database connection
*/
public static Connection getConnection() throws SQLException, IOException
{
Properties props = new Properties();
FileInputStream in = new FileInputStream("database.properties");
props.load(in);
in.close();
String drivers = props.getProperty("jdbc.drivers");
if (drivers != null) System.setProperty("jdbc.drivers", drivers);
String url = props.getProperty("jdbc.url");
String username = props.getProperty("jdbc.username");
String password = props.getProperty("jdbc.password");
return DriverManager.getConnection(url, username, password);
}
}
//File: database.properties
#jdbc.drivers=org.apache.derby.jdbc.ClientDriver
jdbc.url=jdbc:derby://localhost:1527/COREJAVA;create=true
jdbc.username=dbuser
jdbc.password=secret