[Java知识库] 搭建ssm下增删改查框架（增删改查代码）

package com.javen.model;

public class Student {
    private  Integer id;
    private String name;
    private String sex;
    private Integer age;

    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 getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "Student{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", sex='" + sex + '\'' +
                ", age=" + age +
                '}';
    }
}

3.编写Mapper层StudentMapper.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.javen.dao.StudentDao">
    <select id="findAll" resultType="com.javen.model.Student">
        select * from student
    </select>

    <insert id="insert" parameterType="com.javen.model.Student">
         insert into student (name,sex,age) values (#{name},#{sex},#{age})
    </insert>

    <delete id="delete" parameterType="java.lang.Integer">
        delete from student where id = #{id}
    </delete>
    <update id="update" parameterType="com.javen.model.User">
       update  student set name = #{name} , sex = #{sex}, age = #{age} where id = #{id}
    </update>
</mapper>

4.编写Dao层接口 StudentDao.java

package com.javen.dao;

import com.javen.model.Student;
import com.javen.model.User;

import java.util.List;

public interface StudentDao {
    public List<Student> findAll();
    public int insert(Student student);
    public int delete(Integer id );
    public int update(Student student);
}

5.编写Service层IStudentService.java接口

package com.javen.service;

import com.javen.model.Student;

import java.util.List;

public interface IStudentService {
    public List<Student> findAll();
    public int insert(Student student);
    public int delete(Integer id );
    public int update(Student student);
}

6. 编写Service层下的实现层impl IStudentServiceImpl.java

package com.javen.service.impl;

import com.javen.dao.StudentDao;
import com.javen.model.Student;
import com.javen.service.IStudentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;
@Service
public class IStudentServiceImpl implements IStudentService {
    @Autowired
    private StudentDao studentDao;

    public List<Student> findAll() {
        return this.studentDao.findAll();
    }

    public int insert(Student student) {
        return this.studentDao.insert(student);
    }

    public int delete(Integer id) {
        return this.studentDao.delete(id);
    }

    public int update(Student student) {
        return this.studentDao.update(student);
    }
}

7.最后一步，编写Controller层 StudentController.java

package com.javen.controller;

import com.javen.model.Student;
import com.javen.model.User;
import com.javen.service.IStudentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import java.util.List;

@Controller
@RequestMapping("/student")
public class StudentController {
    @Autowired
    private IStudentService studentService;

    @RequestMapping("/findAll")
    @ResponseBody
    public List<Student> findAll(){
        List<Student> students = studentService.findAll();
        return students;
    }
    @ResponseBody
    @RequestMapping("/insert")
    public int insert(Student student) {
        int count = studentService.insert(student);
        /*System.out.println(count);*/
        return count;
    }
    @ResponseBody
    @RequestMapping("/delete")
    public int delete(Integer id){
        int count = studentService.delete(id);
        /*System.out.println(count);*/
        return count;
    }
    @ResponseBody
    @RequestMapping("/update")
    public int update(Student student){
        int count = studentService.update(student);
        /*System.out.println(count);*/
        return count;
    }
}