急求JAVA代码

无非是连接数据库操作的代码。。。不难吧。。。。
public String update(Vector v){
String result ="";
if(v==null || v.isEmpty()) return "无更新用户数据，取消更新!";
Connection conn = null;
PreparedStatement pstmt = null;
String sql = "update tbluser set USERNAME=?, PASSWORD=?, NAME=?";
try {
conn = ConnectionFactory.getInstance().getFreeConnection();
pstmt = conn.prepareStatement(sql);

pstmt.setString(1,(String)v.get(0));
pstmt.setString(2,(String)v.get(1));
pstmt.setString(3,(String)v.get(2));

int k = pstmt.executeUpdate();
if(k!=1) result = "更新用户数据失败!";

} catch (Exception ex) {
result = "更新用户数据出现异常: "+ex.getMessage();
ex.printStackTrace();
} finally {
try {

if (pstmt != null) {
pstmt.close();