使用原生JDBC操作数据库

现在都是使用mybatis来操作数据库，至于如何使用JDBC来操作数据库，基本上忘记的差不多了，特此记录一下
感情深不深 ，都在代码里，废话不多说，直接上代码

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
/**
 * 工具类，获取数据库的连接
 */
public class DBUtil {
	private static String URL="jdbc:mysql://127.0.0.1:3306/test";
	private static String USER="root";
	private static String PASSWROD ="123456";
	private static Connection connection=null;
	static{
		try {
			Class.forName("com.mysql.jdbc.Driver");
			// 获取数据库连接
			connection=DriverManager.getConnection(URL,USER,PASSWROD);
			System.out.println("连接成功");
		} catch (ClassNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	// 返回数据库连接
	public static Connection getConnection(){
		return connection;
	}
}

import model.Student;

import java.util.ArrayList;
import java.util.List;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import db.DBUtil;
/**
 * 操作学生表的dao类
 * 下面均使用预编译的方法
 */
public class StudentDao {
	//将连接定义为单例
	private static Connection connection = DBUtil.getConnection();
	// 添加新的学生
	public void addStudent(Student student){
		String sql ="insert into student(name,age,score) "+
					"values(?,?,?)";
		boolean result = false;
		try {
			// 将sql传进去预编译
			PreparedStatement preparedstatement = connection.prepareStatement(sql);
			// 下面把参数传进去
			preparedstatement.setString(1, student.getName());
			preparedstatement.setInt(2, student.getAge());
			preparedstatement.setDouble(3, student.getScore());
			preparedstatement.execute();
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			System.out.println("创建数据库连接失败");
		}
	}
	// 更新学生信息
	public void updateStudent(Student student){
		String sql = "update student set name = ? ,age =?,score = ? where id = ? ";
		boolean result = false;
		try {
			PreparedStatement preparedStatement = connection.prepareStatement(sql);
			preparedStatement.setString(1, student.getName());
			preparedStatement.setInt(2, student.getAge());
			preparedStatement.setDouble(3, student.getScore());
			preparedStatement.setInt(4, student.getId());
			preparedStatement.executeUpdate();
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			System.out.println("连接数据库失败");
		}
	}
	// 根据id删除一个学生
	public void deleteStudent(int id){
		String sql = "delete from student where id = ?";
		boolean result = false;
		try {
			PreparedStatement preparedStatement = connection.prepareStatement(sql);
			preparedStatement.setInt(1, id);
			result=preparedStatement.execute();
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	// 根据id查询学生
	public Student selectStudent(int id){
		String sql ="select * from student where id =?";
		try {
			PreparedStatement preparedStatement = connection.prepareStatement(sql);
			preparedStatement.setInt(1, id);
			ResultSet resultSet = preparedStatement.executeQuery();
			Student student = new Student();
			// 一条也只能使用resultset来接收
			while(resultSet.next()){
				student.setId(resultSet.getInt("id"));
				student.setName(resultSet.getString("name"));
				student.setAge(resultSet.getInt("age"));
				student.setScore(resultSet.getDouble("score"));
			}
			return student;
		} catch (SQLException e) {
			// TODO: handle exception
		}
		return null;
	}
	// 查询所有学生，返回List
	public List<Student> selectStudentList(){
		List<Student>students  = new ArrayList<Student>(); 
		String sql ="select * from student ";
		try {
			PreparedStatement preparedStatement = DBUtil.getConnection().prepareStatement(sql);
			ResultSet resultSet = preparedStatement.executeQuery();
			// 不能把student在循环外面创建，要不list里面六个对象都是一样的，都是最后一个的值，
			// 因为list add进去的都是引用
			// Student student = new Student();
			while(resultSet.next()){
				Student student = new Student();
				student.setId(resultSet.getInt(1));
				student.setName(resultSet.getString(2));
				student.setAge(resultSet.getInt(3));
				student.setScore(resultSet.getDouble(4));
				students.add(student);

			}
		} catch (SQLException e) {
			// TODO: handle exception
		}
		return students;
	}
}``

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