问题描述

sql 2005跟哪些版本的eclipse能连接。。

还有能不能帮忙告诉我，有什么代码能看数据库是否连接。。谢谢

顺便帮我看下下面的代码哪里错了

代码如下：
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class DBUtils {
private static final String className = null;

private DBUtils(){}

private static DBUtils instance = null;

public synchronized static DBUtils getInstance(){
    if(instance == null) {
        instance = new DBUtils();
    }
    return instance;
}

String driver = "com.microsoft.jdbc.sqlserver.SQLServerDriver";// 数据库驱动字符串
String url = "jdbc:sqlserver://127.0.0.1:1433;DatabaseName=MyCRM";// 连接URL
String user = "sa"; // 数据库用户名
String password = "juemi2135"; // 用户密码

public Connection getConnection() throws SQLException {
    Connection conn=null;
    try {

        Class.forName(className);
        conn = DriverManager.getConnection(url, user, password);
    } catch (ClassNotFoundException e) {
        e.printStackTrace();
    }
    return conn;
}

public static void main(String[] args) throws SQLException {
    long begin = System.currentTimeMillis();
    for(int i=0;i<1000;i++){
    Connection conn = DBUtils.getInstance().getConnection();
    conn.close();
    }
    long end=System.currentTimeMillis();
    System.out.println(end-begin);
}

}

错误如下：
Exception in thread "main" java.lang.NullPointerException
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:169)
at DBUtils.getConnection(DBUtils.java:29)
at DBUtils.main(DBUtils.java:40)