Springboot 整合Mybatis 实现增删改查(二）

续上篇：Springboot整合Mybatis的详细案例+图解+分析-CSDN博客

mapper层（StudentMapper）

    //通过id查询student方法Student searchStudentById(int id);//通过id删除student方法int deleteStudentById(int id);//通过id增加student方法int insertStudent(Student student);//通过id修改student方法int updateStudent(Student student);

service层（StudentService）

    //通过id查询student方法Student searchStudentById(int id);//通过id删除student方法int deleteStudentById(int id);//通过id增加student方法String insertStudent(Student student);//通过id修改student方法String updateStudent(Student student);

service接口层（StudentServiceImpl）

    //通过id查找@Overridepublic Student searchStudentById(int id) {return studentMapper.searchStudentById(id);}//删除@Overridepublic int deleteStudentById(int id) {int result1 = studentMapper.deleteStudentById(id);if (result1 == 1) {return 1;} else {return 0;}}//添加@Overridepublic String insertStudent(Student student){int result2=studentMapper.insertStudent(student);if(result2==1){return "添加成功！";}else{return "添加失败！";}}//修改@Overridepublic String updateStudent(Student student){int result3=studentMapper.updateStudent(student);if(result3==1){return "修改成功！";}else{return "修改失败！";}}

controller层（StudentController）

    @RequestMapping("/query/{id}")public String searchStudentById(@PathVariable("id") int id){Student student=studentService.searchStudentById(id);return student.toString();}@RequestMapping("/delete/{id}")public int deleteStudentById(@PathVariable("id") int id){return studentService.deleteStudentById(id);}@RequestMapping("/insert")public String insertStudent(Student student){return studentService.insertStudent(student);}@RequestMapping("/update")public String updateStudent(Student student){return studentService.updateStudent(student);}

*mapper.xml(StudentMapper.xml)

    <resultMap id="BaseResultMap" type="com.example.demo.entity.Student"><result column="id" jdbcType="INTEGER" property="id"/><result column="userName" jdbcType="VARCHAR" property="username"/><result column="passWord" jdbcType="VARCHAR" property="password"/><result column="sex" jdbcType="VARCHAR" property="sex"/><result column="age" jdbcType="INTEGER" property="age"/></resultMap><select id="queryStudentList" resultType="Student">select * from student</select><select id="searchStudentById" parameterType="java.lang.Integer" resultType="Student">select * from student where id=#{id}</select><delete id="deleteStudentById" parameterType="java.lang.Integer">delete from student where id=#{id}</delete><insert id="insertStudent">insert into student (id,username,password,sex,age) values (#{id},#{username},#{password},#{sex},#{age})</insert><update id="updateStudent">update student set username=#{username},password=#{password},sex=#{sex},age=#{age} where id=#{id}</update>

运行结果

查询：http://localhost:8081/query/2

==>  Preparing: select * from student
==> Parameters: 
<==    Columns: id, username, password, sex, age
<==        Row: 1, tom, 123, nan, 22
<==        Row: 2, qq, 123456, nu, 23
<==        Row: 3, aa, 11111, nan, 20
<==        Row: 4, cd, 123456, nan, 21
<==      Total: 4

添加：http://localhost:8081/insert?id=5&username=dd&password=123456&sex=nan&age=25

==>  Preparing: select * from student
==> Parameters: 
<==    Columns: id, username, password, sex, age
<==        Row: 1, tom, 123, nan, 22
<==        Row: 2, qq, 123456, nu, 23
<==        Row: 3, aa, 11111, nan, 20
<==        Row: 4, cd, 123456, nan, 21
<==        Row: 5, dd, 123456, nan, 25
<==      Total: 5

删除：http://localhost:8081/delete/4

==> Parameters: 
<==    Columns: id, username, password, sex, age
<==        Row: 1, tom, 123, nan, 22
<==        Row: 2, qq, 123456, nu, 23
<==        Row: 3, aa, 11111, nan, 20
<==        Row: 5, dd, 123456, nan, 25
<==      Total: 4

修改：http://localhost:8081/update?id=5&username=LL&password=1256&sex=nu&age=20

==> Parameters: 
<==    Columns: id, username, password, sex, age
<==        Row: 1, tom, 123, nan, 22
<==        Row: 2, qq, 123456, nu, 23
<==        Row: 3, aa, 11111, nan, 20
<==        Row: 5, LL, 1256, nu, 20
<==      Total: 4