MyBatis多对多增删改查（不建关联实体）

ゞ浴缸里的玫瑰 2022-08-05 04:19 193阅读 0赞

## 写在前面 ##

> 本文的出发点在于：本人师傅比较NB，在项目中数据库操作用的MyBatis，需要涉及到多对多的操作，问师傅多对多是否需要建立关联实体，师傅说了句“低级的可以建，高级的不需要”，于是乎，为了挑战难度，在项目中最终以不建立关联实体解决了多对多的操作问题。于是空闲的时间自己用`spring-mvc 4`、`MyBatis` 、`MySQL` 、`Maven`从零搭建起一个 简单的demo，一是为了从头到尾巩固理解，二是为了留着以后忘记了可以查阅，三是也希望能帮助到一些像我这样菜鸟级别的人。此片文章可能非常长，我写的步骤也算很细了，NB的人肯定认为很累赘，不过重在分享！

## 环境工具 ##

>  *  操作系统：Windows 7
>  *  开发工具：Intellij IDEA 14
>  *  数据库连接：Navicat 11 Premium
>  *  接口测试：Postman

--------------------

## demo要完成的功能 ##

>  *  对学生student的操作：学生学号必须唯一  
>     
>     
>      *  添加学生信息；
>      *  修改学生信息；
>      *  按学号查询学生信息；
>      *  查询所有学生信息(不加载所选教师信息)；
>      *  查询所有学生信息(同时加载所选教师信息);
>  *  对教师teacher的操作：教师工号必须唯一  
>     
>     
>      *  添加教师信息；
>      *  修改教师信息；
>      *  按工号查询教师信息；
>      *  查询所有教师信息(不加载所教学生信息)；
>      *  查询所有教师信息(同时加载所教学生信息);
>  *  对关联表student\_teacher的操作：学生选授课教师  
>     
>     
>      *  学生选择多个授课教师，关联信息插入关联表中

## demo依赖jar包说明 ##

>  *  junit-3.8.1.jar：用于单元测试；
>  *  spring-jdbc-4.1.6.RELEASE.jar：事务管理；
>  *  spring-webmvc-4.1.6.RELEASE.jar：spring-mvc 4必须；
>  *  spring-aspects-4.1.6.RELEASE.jar：面向切面编程；
>  *  mybatis-3.2.8.jar：MyBatis必须；
>  *  mybatis-spring-1.2.2.jar：MyBatis整合spring所需；
>  *  commons-dbcp-1.4.jar：数据库连接池；
>  *  slf4j-log4j12-1.7.7.jar：打印日志；
>  *  servlet-api-2.5.jar：servlet容器所需
>  *  fastjson-1.1.36.jar：json数据转换工具；
>  *  jackson-databind-2.3.3.jar：序列化类为json格式数据所需；
>  *  mysql-connector-java-5.1.32.jar：java连接MySQL数据库驱动包

--------------------

## 开发步骤 ##

### 第一步：新建数据库 ###

> 1.ER图：  
> ![学生教师ER图][ER]
> 
> 2.student表：  
> ![学生表][20150604214858015]
> 
> 3.teacher表：  
> ![教师表][20150604215037395]
> 
> 4.关联表student\_teacher：  
> ![关联表][20150604214958216]
> 
> 5.关联表增加外键与student和teacher关联：  
> ![外键关联][20150604215206065]

--------------------

### 第二步：新建Maven工程 ###

> 1.新建maven webapp工程：  
> ![新建工程][20150605171115270]
> 
> 2.填写maven坐标：  
> ![maven坐标][maven]
> 
> 3.新建完成的工程：  
> ![工程结构][20150605171420099]
> 
> 4.配置maven：  
> (1).maven home directory：maven解压后所在的路径；  
> (2).usere settings file:maven conf目录下的setting文件，具体配置略；  
> (3).local repository：本地maven仓库所在的目录，用于存放jar  
> ![maven配置][maven 1]

--------------------

### 第三步：搭建项目结构 ###

> 新建entity包、dao包、service包、impl包、controller包，结构按需自定义  
> ![项目结构][20150605171836368]

--------------------

### 第四步：配置开发环境参数 ###

> 修改项目编码：三处均为 “UTF-8”  
> ![修改编码][20150605172751722]

--------------------

### 第五步：增加所有jar依赖到pom.xml ###

添加项目所需的所有jar的maven坐标：

<dependencies>
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>3.8.1</version>
                <scope>test</scope>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-jdbc</artifactId>
                <version>4.1.6.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-webmvc</artifactId>
                <version>4.1.6.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-aspects</artifactId>
                <version>4.1.6.RELEASE</version>
            </dependency>
            
            <dependency>
                <groupId>org.mybatis</groupId>
                <artifactId>mybatis</artifactId>
                <version>3.2.8</version>
            </dependency>
            <dependency>
                <groupId>org.mybatis</groupId>
                <artifactId>mybatis-spring</artifactId>
                <version>1.2.2</version>
            </dependency>
            <dependency>
                <groupId>commons-dbcp</groupId>
                <artifactId>commons-dbcp</artifactId>
                <version>1.4</version>
            </dependency>
            <dependency>
                <groupId>org.slf4j</groupId>
                <artifactId>slf4j-log4j12</artifactId>
                <version>1.7.7</version>
            </dependency>
            <dependency>
                <groupId>javax.servlet</groupId>
                <artifactId>servlet-api</artifactId>
                <version>2.5</version>
                <scope>provided</scope>
            </dependency>
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>fastjson</artifactId>
                <version>1.1.36</version>
            </dependency>
    
            <dependency>
                <groupId>com.fasterxml.jackson.core</groupId>
                <artifactId>jackson-databind</artifactId>
                <version>2.3.3</version>
            </dependency>
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>5.1.32</version>
                <scope>runtime</scope>
            </dependency>
        </dependencies>

--------------------

### 第六步：配置application.development.properties和applicationContext.xml ###

1.  application.development.properties：数据库连接参数以及数据库连接池参数；

#mysql database setting
    jdbc.driver=com.mysql.jdbc.Driver
    jdbc.url=jdbc:mysql://127.0.0.1/mybatis-demo?useUnicode=true&characterEncoding=utf-8
    jdbc.username=user
    jdbc.password=123456
    
    #connection pool settings
    jdbc.pool.minIdle=3
    jdbc.pool.maxIdle=5
    jdbc.pool.maxActive=15
    jdbc.pool.maxWait=120000

2 . applicationContext.xml：spring容器核心配置

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:p="http://www.springframework.org/schema/p" xmlns="http://www.springframework.org/schema/beans" xmlns:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd" default-lazy-init="true">
        <description>Spring公共配置</description>
        
        <context:annotation-config/>
        
        <context:component-scan base-package="com.xiaolong.demo"/>
    
        
        <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
            <property name="dataSource" ref="dataSource"/>
            
            <property name="typeAliasesPackage" value="com.xiaolong.demo"/>
            
            <property name="mapperLocations" value="classpath:/mybatis/*Mapper.xml"/>
        </bean>
        
        <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
            <property name="basePackage" value="com.xiaolong.demo.dao"/>
            <property name="annotationClass" value="com.xiaolong.demo.dao.MyBatisRepository"/>
        </bean>
    
        
        <tx:annotation-driven proxy-target-class="true"/>
        <bean id="transactionManager" name="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
            <property name="dataSource">
                <ref bean="dataSource"/>
            </property>
        </bean>
        <tx:advice id="transactionAdvice" transaction-manager="transactionManager">
            
                
            
        </tx:advice>
        <aop:config proxy-target-class="true">
            <aop:pointcut id="transactionPointcut" expression="execution(* com.xiaolong.demo.service.impl.*.*(..))"/>
            <aop:advisor pointcut-ref="transactionPointcut" advice-ref="transactionAdvice"/>
        </aop:config>
    
        
        <beans profile="development">
            <context:property-placeholder ignore-resource-not-found="true" location="classpath*:/application.development.properties"/>
    
            <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
                <property name="driverClassName" value="${jdbc.driver}"/>
                <property name="url" value="${jdbc.url}"/>
                <property name="username" value="${jdbc.username}"/>
                <property name="password" value="${jdbc.password}"/>
    
                <property name="maxActive">
                    <value>${jdbc.pool.maxActive}</value>
                </property>
                <property name="maxIdle">
                    <value>${jdbc.pool.maxIdle}</value>
                </property>
                <property name="minIdle">
                    <value>${jdbc.pool.minIdle}</value>
                </property>
                <property name="maxWait">
                    <value>${jdbc.pool.maxWait}</value>
                </property>
            </bean>
            <bean id="studentService" class="com.xiaolong.demo.service.impl.StudentServiceImpl" />
            <bean id="teacherService" class="com.xiaolong.demo.service.impl.TeacherServiceImpl" />
        </beans>
    </beans>

--------------------

### 第七步：配置spring-mvc.xml ###

--------------------

### 第七步：新建实体Student和Teacher ###

Student实体：

public class Student { 
        private Integer id;                 //id
        private String name;                //姓名
        private String number;              //学号,保证唯一
        private String gender;              //性别
        private Integer age;                //年龄
        private List<Teacher> teachers;     //授课老师集合
        ..........省略get、set............
      }

Teacher实体：

public class Teacher { 
        private Integer id;                 //id
        private String name;                //姓名
        private String number;              //工号,保证唯一
        private String gender;              //性别
        private Integer age;                //年龄
        private List<Student> students;     //所教学生集合
        ............省略get、set方法.....................   
     }

### 第八步：新建StudentMyBatisDao接口 ###

在此之前需要先写个注解类MyBatisRepository

@Retention(RetentionPolicy.RUNTIME)
    @Target({ElementType.TYPE})
    public @interface MyBatisRepository { 
    }

然后新建StudentMyBatisDao接口

@MyBatisRepository
    public interface StudentMyBatisDao { 
        int addStudent(Student student);
    
        int updateStudent(Student student);
    
        Student findStudentByNumber(String number);
    
        Student findStudentById(Long id);
    
        List<Student> findAll();
    
        List<Student> findAllWithTeachers();
    
        int selectTeachers(Long studentId, List<Long> teacherIds);
    }

--------------------

### 第九步：编写MyBatis的StudentMapper.xml ###

说明：这里我使用了查询结果的继承关系，当不需要查询列表是resultMap就写studentMap，当需要将教师信息同时加载时返回的resultMap就是studentTeacherMap。另外，多对多在插入关联表的时候我使用的是批量插入，用了foreach，param2代表第二个集合参数

<?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.xiaolong.demo.dao.StudentMyBatisDao">
        
        <resultMap id="studentMap" type="com.xiaolong.demo.entity.Student">
            <id column="id" property="id" jdbcType="BIGINT"/>
    
            <result column="name" property="name" jdbcType="VARCHAR"/>
            <result column="number" property="number" jdbcType="VARCHAR"/>
            <result column="gender" property="gender" jdbcType="VARCHAR"/>
            <result column="age" property="age" jdbcType="INTEGER"/>
        </resultMap>
        
        <resultMap id="studentTeacherMap" type="com.xiaolong.demo.entity.Student" extends="studentMap">
            <collection property="teachers" ofType="com.xiaolong.demo.entity.Teacher">
                <id property="id" column="t_id" jdbcType="BIGINT"/>
    
                <result property="name" column="t_name" jdbcType="VARCHAR"/>
                <result property="number" column="t_number" jdbcType="VARCHAR"/>
                <result property="gender" column="t_gender" jdbcType="VARCHAR"/>
                <result property="age" column="t_age" jdbcType="INTEGER"/>
            </collection>
        </resultMap>
    
    
        <sql id="columns">
            id,name,number,gender,age
        </sql>
    
        <select id="findStudentByNumber" resultMap="studentMap" parameterType="java.lang.String">
            SELECT
            <include refid="columns"/>
            FROM student
            WHERE number=#{0}
        </select>
    
        <select id="findStudentById" resultMap="studentTeacherMap" parameterType="java.lang.Long">
            SELECT
            s.id,s.name,s.number,s.gender,s.age,
    
            t.id as t_id,t.name as t_name,t.number as t_number,t.gender as t_gender,t.age as t_age
            FROM
            student s LEFT JOIN student_teacher st
            ON s.id=st.s_id
            LEFT JOIN teacher t
            ON t.id=st.t_id
            WHERE s.id=#{0}
        </select>
    
        <select id="findAll" resultMap="studentMap">
            SELECT * FROM student
        </select>
    
        <select id="findAllWithTeachers" resultMap="studentTeacherMap">
            SELECT
            s.id,s.name,s.number,s.gender,s.age,
    
            t.id as t_id,t.name as t_name,t.number as t_number,t.gender as t_gender,t.age as t_age
            FROM
            student s LEFT JOIN student_teacher st
            ON s.id=st.s_id
            LEFT JOIN teacher t
            ON t.id=st.t_id
        </select>
    
        <insert id="addStudent" parameterType="com.xiaolong.demo.entity.Student">
            insert into student
            (
            name,number,gender,age
            )
            values
            (
            #{name,jdbcType=VARCHAR},#{number,jdbcType=VARCHAR},#{gender,jdbcType=VARCHAR},#{age,jdbcType=INTEGER}
            )
        </insert>
        <update id="updateStudent" parameterType="com.xiaolong.demo.entity.Student">
            update student
            <set>
                <if test="name != null">
                    name = #{name,jdbcType=VARCHAR},
                </if>
                <if test="number != null">
                    number = #{number,jdbcType=VARCHAR},
                </if>
                <if test="gender != null">
                    gender = #{gender,jdbcType=VARCHAR},
                </if>
                <if test="age != null">
                    age = #{age,jdbcType=INTEGER},
                </if>
            </set>
            where id=#{id,jdbcType=BIGINT}
        </update>
        
        <insert id="selectTeachers">
    
            INSERT INTO student_teacher
            (s_id,t_id)
            VALUES
            <foreach collection="param2" item="id" separator=",">
                (#{0}, #{id})
            </foreach>
    
        </insert>
    </mapper>

--------------------

### 第十步：编写StudentService接口 ###

功能包括:对学生的增删改查以及学生选择教师

public interface StudentService { 
        public void addStudent(Student student) throws Exception;
    
        public void updateStudent(Student student) throws Exception;
    
        public Student findStudentByNumber(String number);
    
        public List<Student> findAll();
    
        public List<Student> findAllWithTeachers();
    
        public void selectTeachers(Long studentId,List<Long> teacherIds)throws Exception;
    }

--------------------

### 第十一步：编写StudentServiceImpl实现类 ###

在添加和修改是我手动判断了学号是否重复

package com.xiaolong.demo.service.impl;
    
    import com.alibaba.fastjson.JSONObject;
    import com.xiaolong.demo.dao.StudentMyBatisDao;
    import com.xiaolong.demo.entity.Student;
    import com.xiaolong.demo.entity.Teacher;
    import com.xiaolong.demo.service.StudentService;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Component;
    import org.springframework.transaction.annotation.Transactional;
    
    import java.util.List;
    
    /** * Created by xiaolong.zhu on 2015/6/4. */
    @SuppressWarnings("ALL")
    @Transactional
    @Component
    public class StudentServiceImpl implements StudentService { 
        private static final Logger logger = LoggerFactory.getLogger(StudentServiceImpl.class);
        @Autowired
        private StudentMyBatisDao studentMyBatisDao;
    
        @Override
        public void addStudent(Student student) throws Exception {
            logger.info("添加学生信息{}", JSONObject.toJSONString(student));
            Student another = studentMyBatisDao.findStudentByNumber(student.getNumber());
            if (another != null && another.getId() != student.getId())
                throw new Exception("参数异常，number重复");
            int result = studentMyBatisDao.addStudent(student);
            if (result != 1)
                throw new Exception("添加学生信息失败");
        }
    
        @Override
        public void updateStudent(Student student) throws Exception {
            logger.info("修改学生信息{}", JSONObject.toJSONString(student));
            if (student.getId() == null)
                throw new Exception("参数异常，id为null");
            Student another = studentMyBatisDao.findStudentByNumber(student.getNumber());
            if (another != null && another.getId() != student.getId())
                throw new Exception("参数异常，number重复");
            int result = studentMyBatisDao.updateStudent(student);
            if (result != 1)
                throw new Exception("修改学生信息失败");
        }
    
        @Override
        public Student findStudentByNumber(String number) {
            logger.info("通过学号{}查询学生信息", number);
            Student student = studentMyBatisDao.findStudentByNumber(number);
            return student;
        }
    
        @Override
        public List<Student> findAll() {
            logger.info("查询所有学生信息");
            return studentMyBatisDao.findAll();
        }
    
        @Override
        public List<Student> findAllWithTeachers() {
            logger.info("查询所有学生信息及授课老师");
            return studentMyBatisDao.findAllWithTeachers();
        }
    
        @Override
        public void selectTeachers(Long studentId, List<Long> teacherIds) throws Exception {
            logger.info("学生{}选择授课老师{}", studentId, teacherIds.toArray());
            Student student = studentMyBatisDao.findStudentById(studentId);
            for (Teacher teacher : student.getTeachers()) {
                if (teacher != null) {
                    if (teacherIds.contains(teacher.getId()))
                        throw new Exception("参数异常,该学生" + studentId + "已经选择了此教师" + teacher.getId() + "，不允许重复操作");
                }
            }
            int result = studentMyBatisDao.selectTeachers(studentId, teacherIds);
            if (result != teacherIds.size())
                throw new Exception("参数异常，教师id错误");
        }
    }

在完成StudentServiceImpl之后，为了在Controller中能用`@Autowired`自动注入，需要将StudentServiceImpl在spring容器中注册，见applicationContext.xml

--------------------

### 第十二步：编写StudentController类 ###

说明：由于用的spring mvc 4，所以`@ResponseBody`就不用在写了，它已经写在了注解类`@RestController`中了。另外，ip是获取客户端真是ip，若使用了代理，就从header中取得，未使用代理，就使用`request.getRemoteHost()`得到。

package com.xiaolong.demo.controller;
    
    import com.alibaba.fastjson.JSONObject;
    import com.xiaolong.demo.entity.Student;
    import com.xiaolong.demo.service.StudentService;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.http.HttpStatus;
    import org.springframework.http.MediaType;
    import org.springframework.http.ResponseEntity;
    import org.springframework.web.bind.annotation.*;
    
    import javax.servlet.http.HttpServletRequest;
    import java.util.List;
    
    
    /** * Created by xiaolong.zhu on 2015/6/4. */
    @SuppressWarnings("SpringJavaAutowiringInspection")
    @RestController
    @RequestMapping(value = "/demo/", consumes = {MediaType.ALL_VALUE})
    public class StudentController { 
        private static final Logger logger = LoggerFactory.getLogger(StudentController.class);
    
        @Autowired
        private StudentService studentService;
    
        @RequestMapping(value = "student", method = RequestMethod.POST, consumes = {MediaType.APPLICATION_JSON_VALUE})
        public ResponseEntity addStudent(@RequestBody Student student, HttpServletRequest request) {
            String ip = request.getHeader("X-Forwarded-For");
            if (ip == null)
                ip = request.getRemoteHost();
            logger.info("ip {} 正添加新的学生信息{}", ip, JSONObject.toJSONString(student));
            try {
                studentService.addStudent(student);
                return new ResponseEntity(null, HttpStatus.OK);
            } catch (Exception e) {
                e.printStackTrace();
                logger.info(e.getMessage());
                JSONObject error = new JSONObject();
                error.put("error", e.getMessage());
                return new ResponseEntity(error, HttpStatus.BAD_REQUEST);
            }
        }
    
        @RequestMapping(value = "student", method = RequestMethod.PUT, consumes = {MediaType.APPLICATION_JSON_VALUE})
        public ResponseEntity updateStudent(@RequestBody Student student, HttpServletRequest request) {
            String ip = request.getHeader("X-Forwarded-For");
            if (ip == null)
                ip = request.getRemoteHost();
            logger.info("ip {} 正修改学生信息{}", ip, JSONObject.toJSONString(student));
            try {
                studentService.updateStudent(student);
                return new ResponseEntity(null, HttpStatus.OK);
            } catch (Exception e) {
                e.printStackTrace();
                logger.info(e.getMessage());
                JSONObject error = new JSONObject();
                error.put("error", e.getMessage());
                return new ResponseEntity(error, HttpStatus.BAD_REQUEST);
            }
        }
    
        @RequestMapping(value = "student/{number}", method = RequestMethod.GET, produces = {MediaType.APPLICATION_JSON_VALUE})
        public ResponseEntity findByNumber(@PathVariable("number") String number,
                                           HttpServletRequest request) {
            String ip = request.getHeader("X-Forwarded-For");
            if (ip == null)
                ip = request.getRemoteHost();
            logger.info("ip {} 正通过学号{}获取学生信息", ip, number);
            Student student = studentService.findStudentByNumber(number);
            return new ResponseEntity(student, HttpStatus.OK);
        }
    
    
        @RequestMapping(value = "students", method = RequestMethod.GET, produces = {MediaType.APPLICATION_JSON_VALUE})
        public ResponseEntity findAll(HttpServletRequest request) {
            String ip = request.getHeader("X-Forwarded-For");
            if (ip == null)
                ip = request.getRemoteHost();
            logger.info("ip {} 获取所有学生信息", ip);
            List<Student> students = studentService.findAll();
            return new ResponseEntity(students, HttpStatus.OK);
        }
    
        @RequestMapping(value = "students/teachers", method = RequestMethod.GET, produces = {MediaType.APPLICATION_JSON_VALUE})
        public ResponseEntity findAllWithTeachers(HttpServletRequest request) {
            String ip = request.getHeader("X-Forwarded-For");
            if (ip == null)
                ip = request.getRemoteHost();
            logger.info("ip {} 获取所有学生信息以及其授课老师", ip);
            List<Student> students = studentService.findAllWithTeachers();
            return new ResponseEntity(students, HttpStatus.OK);
        }
    
        @RequestMapping(value = "student/{id}/teachers", method = RequestMethod.POST, consumes = {MediaType.APPLICATION_JSON_VALUE})
        public ResponseEntity selectTeachers(@PathVariable("id") Long studentId,
                                             @RequestBody JSONObject ids,
                                             HttpServletRequest request) {
            String ip = request.getHeader("X-Forwarded-For");
            if (ip == null)
                ip = request.getRemoteHost();
            logger.info("ip {} 学生{}选择授课老师{}",ip,studentId,ids.toJSONString());
            try {
                studentService.selectTeachers(studentId, (List<Long>) ids.get("teacherIds"));
                return new ResponseEntity(null, HttpStatus.OK);
            }catch (Exception e) {
                e.printStackTrace();
                logger.info(e.getMessage());
                JSONObject error = new JSONObject();
                error.put("error", e.getMessage());
                return new ResponseEntity(error, HttpStatus.BAD_REQUEST);
            }
        }
    }

--------------------

### 第十三步：测试Student操作的接口 ###

所有接口集合：  
![所有接口][20150606001817324]

> 1.测试添加学生信息：  
> ![添加学生][20150606001844515]
> 
> 2.测试修改学生信息：  
> ![修改学生][20150606001909210]
> 
> 3.测试按学号查询学生信息：  
> ![按学号查询学生][20150606001809127]
> 
> 4.测试查询学生信息集合(不包含授课教师)：  
> ![查询学生集合][20150606001835132]
> 
> 5.测试查询学生信息集合(包含授课教师)：  
> ![查询学生集合][20150606001855474]
> 
> 6.测试学生选择教师(批量)：  
> 若学生重复选择某一个教师，则不允许  
> ![重复选择][20150606001921324]
> 
> 成功选择教师  
> ![选择教师][20150606002024301]
> 
> 操作结果：  
> ![操作结果][20150606002139961]

### 第十四步：新建TeacherMyBatisDao接口 ###

> 同学生部分

### 第十五步：编写MyBatis的TeacherMapper.xml ###

> 同学生部分

### 第十六步：编写TeacherService接口 ###

> 同学生部分

### 第十七步：编写TeacherServiceImpl实现类 ###

> 同学生部分

### 第十八步：编写TeacherController类 ###

> 同学生部分

### 第十九步：测试Teacher操作的接口 ###

> 同学生部分

## 线上接口 ##

demo部署在我服务器使用如下ip地址及端口号即可调用上述所有接口

> 敬请期待….

## 关于我 ##

>  *  Q Q：1250052380
>  *  邮箱：1250052380@qq.com

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