Static versus non-Static methods?
Static versus non-Static methods?
- Subject: Static versus non-Static methods?
- From: Jeffrey Pearson <email@hidden>
- Date: Wed, 22 Mar 2006 16:18:48 -0800
More of a Java question than strictly WebObjects but this exact same
code works in the jp/servlet web app.
When I compile, I get:
cannot resolve symbol on line:
Registry registry = Registry();
in the Main.java file.
If I remove the static parameter from the getMySQLConnection line, I
get:
com/metrohero/web/PublisherFunctions.java:22: non-static method
getMySQLConnection() cannot be referenced from a static context
***********************************************************************
//
// Main.java: Class file for WO Component 'Main'
// Project metropolisadmin
//
// Created by jeffreypearson on 3/21/06
//
import com.webobjects.foundation.*;
import com.webobjects.appserver.*;
import com.webobjects.eocontrol.*;
import com.webobjects.eoaccess.*;
import com.metrohero.common.*;
public class Main extends WOComponent {
public String userName;
public String password;
public Main(WOContext context) {
super(context);
}
public WOComponent validateLogin() {
if ("".equalsIgnoreCase(userName) || "".equalsIgnoreCase(password)) {
return pageWithName("Main");
}
try {
Registry registry = Registry();
Connection MySQLConnection = registry.getMySQLConnection();
Statement stmt = MySQLConnection.createStatement();
ResultSet rset = stmt.executeQuery("SELECT userid from
users where username = '" + userName + "' AND password = '" +
password + "'");
if (rset != null) {
return pageWithName("Home");
} else {
return pageWithName("Main");
}
} catch (SQLException SQLEx) {
System.out.println("SQL Exception:" + SQLEx);
}
//return pageWithName("Home");
}
}
*********************************************************
package com.metrohero.common;
//import java.sql.DriverManager;
import java.sql.*;
//import com.mysql.jdbc.Connection;
import com.mysql.jdbc.Driver;
public class Registry {
//private static OracleDataSource ds;
public static Connection getMySQLConnection() {
Connection MySQLConnection = null;
try {
// The newInstance() call is a work around for some
// broken Java implementations
Class.forName("com.mysql.jdbc.Driver").newInstance();
MySQLConnection = DriverManager.getConnection
("jdbc:mysql://64.81.81.18/metropolis?user=username&password=password");
} catch (Exception ex) {
// handle the error
}
return MySQLConnection;
}
public static void closeMySQLConnection(Connection m_conn)
{
try {
if (m_conn != null) {
m_conn.close();
}
}
catch (SQLException e) {
System.out.println("ERROR_OCCURRED");
e.printStackTrace();
}
}
}
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