sql1

student类

package sdut;

public class Student {
	
	private int id;
	private String name;
	private int age;
	public Student(int id, String name, int age) {
		
		this.id = id;
		this.name = name;
		this.age = age;
	}
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
}

增删改查类

package sdut;

import java.awt.List;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;

public class StudentDao {
	Connection con;
	PreparedStatement pst;
	public Connection getConn() throws ClassNotFoundException, SQLException{
		Class.forName("com.mysql.jdbc.Driver");
	  //2 获得数据库的连接
		Connection con=DriverManager.getConnection("jdbc:mysql://localhost:3306/school?useUnicde=true&characterEncoding=utf-8", "root", "");
	
		return con;
	}
	
	//增加
	public int addstudent(Student student) throws ClassNotFoundException, SQLException{
		con = getConn();
		String SQL = "insert into student values(null, ?, ?)";
		  //准备语句对象
		  pst = con.prepareStatement(SQL);
		  pst.setString(1, student.getName());
		  pst.setInt(2, student.getAge());
		  int result = pst.executeUpdate();
		  
		  pst.close();
		  con.close();
		  return result;
	}
	
	//删除
	public int deletestudent(int id) throws ClassNotFoundException, SQLException{
		con = getConn();
		String SQL = "delete from student where id = ?";
		  //准备语句对象
		  pst = con.prepareStatement(SQL);
		  pst.setInt(1, id);
		  int result = pst.executeUpdate();
		  pst.close();
		  con.close();
		  return result;
	}
	//修改
	
	//查询所有记录
	public List<Student> queryAll(){
		return null;
	}
	
	//根据主键查询记录
	public Student queryById(int id){
		return null;
	}
}