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<td width="90%"><font size="4" face="Verdana, Arial, Helvetica"><b>重新綁定數(shù)據(jù)源</b></font></td><td width="200" align="right"><font size="1" face="Verdana, Arial, Helvetica"><nobr>   第 5 頁(yè)（共6 頁(yè)）</nobr></font></td>
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<p>
當(dāng)您想改變您的代碼將與之通訊的特定的數(shù)據(jù)庫(kù)甚至 JDBC <code>DataSource</code> 廠商時(shí)，所需的一切就是重新綁定新的 <code>DataSource</code> 到原來(lái)的名稱。在本示例中，我們使用相同的驅(qū)動(dòng)程序，但改變了幾個(gè)相關(guān)的參數(shù)：
</p>
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
// We need to import the actual DataSource

import com.inet.tds.TdsDataSource;

import java.util.Hashtable;
import javax.naming.*;
import javax.naming.directory.*;
import java.sql.* ;
import javax.sql.* ;

public class InitializeJNDI {

    // First we define the relevant parameters for this datasource

    private String serverName = "persistentjava.com";
    private int portNumber = 1434; // Note the new port number

    private String login = "sun"; // New username/password combination
    private String password = "java";

    private String databaseName = "ds"; // And even a new database name.

    // We keep the same name for our datasource, just bind a new DataSource 
    // to it.

    private String filePath = "jdbc/pjtutorial";

    public InitializeJNDI() {

        // Establish the proper JNDI Context

        Hashtable env = new Hashtable();
        env.put(
            Context.INITIAL_CONTEXT_FACTORY,
            "com.sun.jndi.fscontext.RefFSContextFactory");

        try {

          // Create the context
 
          Context ctx = new InitialContext(env);

          TdsDataSource ds = new TdsDataSource();

          ds.setServerName(serverName);
          ds.setPortNumber(portNumber);
          ds.setDatabaseName(databaseName);
          ds.setUser(login);
          ds.setPassword(password);
          ds.setDescription("JDBC DataSource Connection, take two");

          // Now we just call the rebind method with the new DataSource.

          ctx.rebind(filePath, ds);
            ctx.close();

        // Replace this with real Exception handlers in production code.

        } catch (Exception ex) {
            System.err.println("ERROR: " + ex.getMessage());
        }
    }

    public static void main(String args[]) {
        new InitializeJNDI();
    }
}
</code>
</pre>
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