嘗試將jdbc驅動程序用於postgresql，但不起作用

Question

據我所知，我已將jdbc驅動程序添加到我的類路徑中，即我將以下內容添加到了我的.profile中

導出CLASSPATH = $ CLASSPATH：location / to / the / jarfile.jar

當我編譯Java程序時，總是會收到此錯誤

javac v9.java
v9.java:8: <identifier> expected
 Class.forName("org.postgresql.Driver");//load the driver
          ^
v9.java:8: illegal start of type
 Class.forName("org.postgresql.Driver");//load the driver
           ^
2 errors

這讓我發瘋，任何幫助都會很棒。 我正在使用Mac OS X Snow Leopard

Java程序在這里

import java.sql.*;

public class v9
{
 String dbURL = "jdbc:postgresql:mydb";
 String user = "UserName";
 String password = "pswd";
 C  try
{
Class.forName("org.postgresql.Driver");//load the driver
// Connect to the database
Connection DBconn = DriverManager.getConnection( dbURL, user, password );
}
catch (Exception e)
{
    e.printStackTrace();
}
}

Answer 1

試試看-您需要在某處使用一種方法：

import java.sql.Connection;
import java.sql.DriverManager;

public class V9
{
    public static final String driver = "org.postgresql.Driver";
    public static final String url = "jdbc:postgresql://localhost:5432/party";
    public static final String username = "pgsuper";
    public static final String password = "pgsuper";

    public static void main(String [] args)
    {
        try
        {
            Class.forName(driver);
            Connection conn = DriverManager.getConnection(url, username, password);
            System.out.println(conn.getMetaData().getDatabaseProductName());
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
    }
}