JSP+JDBC实现增删改查

需求：创建一张老师表，使用jdbc+jsp实现增删改查

1、创建数据库表

2、创建一个web项目

3、代码编写

实体类：

public class Teacher { private Integer id;// private String name; private String age; private String sex; public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getAge() { return age; } public void setAge(String age) { this.age = age; } public String getSex() { return sex; } public void setSex(String sex) { this.sex = sex; } public Teacher() { super(); // TODO Auto-generated constructor stub } public Teacher(Integer id, String name, String age, String sex) { super(); this.id = id; this.name = name; this.age = age; this.sex = sex; } public Teacher(String name, String age, String sex) { super(); this.name = name; this.age = age; this.sex = sex; } public Teacher(String name, String age) { super(); this.name = name; this.age = age; }

Dao:

/** * 查询全部 *  */ public List find(){ try { //加载驱动 Class.forName("com.mysql.jdbc.Driver"); //获取数据库连接信息 Connection con = DriverManager.getConnection("jdbc:mysql:///1604k", "root", "123456"); //执行sql String sql="select * from t_teacher"; PreparedStatement ps = con.prepareStatement(sql); //返回查询的结果集 ResultSet rs = ps.executeQuery(); List list=new ArrayList(); //遍历结果集 while(rs.next()){ int id = rs.getInt("id"); String name = rs.getString("name"); String age = rs.getString("age"); String sex = rs.getString("sex"); //封装结果到对象实体 Teacher t=new Teacher(id, name, age, sex); //将结果放入list集合 list.add(t); } return list; } catch (Exception e) { e.printStackTrace(); } return null; } /** * 增加数据 */ public int add(Teacher t){ int i=0; try { //加载数据库驱动 Class.forName("com.mysql.jdbc.Driver"); //获取数据库连接 Connection con = DriverManager.getConnection("jdbc:mysql:///1604k", "root", "123456"); String sql="insert into t_teacher(name,age,sex) values(?,?,?)"; PreparedStatement ps = con.prepareStatement(sql); //给数据复制 ps.setString(1, t.getName()); ps.setString(2, t.getAge()); ps.setString(3, t.getSex()); //执行sql i = ps.executeUpdate(); } catch (Exception e) { e.printStackTrace(); } return i; } /** * 删除一条数据 */ public int delete(int id){ int i=0; try { //加载数据库驱动 Class.forName("com.mysql.jdbc.Driver"); //获取数据库连接信息 Connection con = DriverManager.getConnection("jdbc:mysql:///1604k", "root", "123456"); //执行sql String sql="DELETE from t_teacher where id=?"; PreparedStatement ps = con.prepareStatement(sql); ps.setInt(1, id); i = ps.executeUpdate(); } catch (Exception e) { e.printStackTrace(); } return i; } /** * 登录 */ public int login(Teacher t){ int a=0; try { //加载数据库驱动 Class.forName("com.mysql.jdbc.Driver"); //获取数据库连接信息 Connection con = DriverManager.getConnection("jdbc:mysql:///1604k", "root", "123456"); //执行sql String sql="SELECT * from t_teacher where name=? and age=?"; PreparedStatement ps = con.prepareStatement(sql); ps.setString(1, t.getName()); ps.setString(2, t.getAge()); ResultSet rs = ps.executeQuery(); //根据返回的值判断是否登录成功 if(rs.next()){ a=1; } } catch (Exception e) { e.printStackTrace(); } return a; } /** * 修改 */ public int update(Teacher t){ int a=0; try { //加载数据库驱动 Class.forName("com.mysql.jdbc.Driver"); //获取数据库连接信息 Connection con = DriverManager.getConnection("jdbc:mysql:///1604k", "root", "123456"); //执行sql String sql="UPDATE t_teacher set name=?,age=?,sex=? WHERE id=?"; PreparedStatement ps = con.prepareStatement(sql); //赋值 ps.setString(1, t.getName()); ps.setString(2, t.getAge()); ps.setString(3, t.getSex()); ps.setInt(4, t.getId()); a = ps.executeUpdate(); } catch (Exception e) { e.printStackTrace(); }  return a; }

JSP页面：

效果图：省略。。。