Spring整合jdbc-jdbc模板api详解

1，

package com.songyan.jdbc2;

public class User {
private int id;
private String name;
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;
}

}

2，

package com.songyan.jdbc2;

import java.util.List;

public interface UserDao {

    //增
    void save(User u);
    //删
    void delete();
    //改
    void update();
    //查
    User findUserById(int id);
    //查
    int findUserCount();
    //查
    List<User> findAllUser();
}

3，

package com.songyan.jdbc2;

import java.util.List;

import org.springframework.jdbc.core.JdbcTemplate;

public class UserDaoImpl implements UserDao{
    private JdbcTemplate jt;

    public void setJt(JdbcTemplate jt) {
        this.jt = jt;
    }

    public void save(User u) {
        String sql="insert into users values ('1',?)" ;
        jt.update(sql,u.getName());

    }

    public void delete(int  id) {
        String sql="delete  from users where id=?" ;
        jt.update(sql,id);
    }

    public void update(User u) {
        String sql="update users set name=? where id=?" ;
        jt.update(sql,u.getId());

    }

    public User findUserById(int id) {
        String sql="select * from users where id=?" ;
        return null;
    }

    public int findUserCount() {
        String sql="select * from users where id=?" ;
        return 0;
    }

    public List<User> findAllUser() {
        return null;
    }

}