实现注册/登陆的基础代码

package conn;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class Conn {
    /**
     * 连接数据库
     *
     * @author Administrator
     *
     */
    public Connection getConnection() {
        Connection conn = null;
        try {
            Class.forName("oracle.jdbc.driver.OracleDriver");
            conn = DriverManager.getConnection(
                    "jdbc:oracle:thin:@localhost:1522:xe", "smn", "orcl");
        } catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return conn;
    }

    /**
     * 添加数据
     * @param conn
     * @param sql
     * @return 返回成功添加记录数
     */
    public int updateMethord(Connection conn,String sql){
        int count=0;
        Statement st;
        try {
            st = conn.createStatement();
            count=st.executeUpdate(sql);
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return count;
    }

    public ResultSet selectMethord(Connection conn,String sql){
        ResultSet rs=null;
        Statement st;
        try {
            st = conn.createStatement();
            rs=st.executeQuery(sql);
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return rs;
    }

    public void closeMethord(Connection conn){
        if(conn!=null){
            try {
                conn.close();
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
}