实现查询

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

//使用druid的工具类实现查询
public class JDBCdemo10 {
    public static void main(String[] args) {
        Connection connection = null;
        PreparedStatement preparedStatement = null;
        ResultSet resultSet = null;
        try {
            //获取连接对象
            connection = JDBCUntils.getConnection();
            String sql = "select * from student";
            preparedStatement = connection.prepareStatement(sql);
            resultSet = preparedStatement.executeQuery();
            while (resultSet.next()){
                String name = resultSet.getString("name");
                int age = resultSet.getInt("age");
                System.out.println(name+": "+age);
            }
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }finally {
            JDBCUntils.close(connection,preparedStatement,resultSet);
        }
    }
}