面试题 - 代码与编程题 - 写一段Jdbc连Oracle的程序,并实现数据查询.

import java.sql.*;

public class jdbc {
  String dbUrl = "jdbc:oracle:thin:@127.0.0.1:1521:orcl";

  String theUser = "admin";

  String thePw = "manager";

  Connection c = null;

  Statement conn;

  ResultSet rs = null;

  public jdbc() {
    try {
      Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();
      c = DriverManager.getConnection(dbUrl, theUser, thePw);
      conn = c.createStatement();
    } catch (Exception e) {
      e.printStackTrace();
    }
  }

  public boolean executeUpdate(String sql) {
    try {
      conn.executeUpdate(sql);
      return true;
    } catch (SQLException e) {
      e.printStackTrace();
      return false;
    }
  }

  public ResultSet executeQuery(String sql) {
    rs = null;
    try {
      rs = conn.executeQuery(sql);
    } catch (SQLException e) {
      e.printStackTrace();
    }
    return rs;
  }

  public void close() {
    try {
      conn.close();
      c.close();
    } catch (Exception e) {
      e.printStackTrace();
    }
  }

  public static void main(String[] args) {
    ResultSet rs;
    jdbc conn = new jdbc();
    rs = conn.executeQuery("select * from test");
    try {
      while (rs.next()) {
        System.out.println(rs.getString("id"));
        System.out.println(rs.getString("name"));
      }
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
}