mybatis 一对一和一对多
目录结构：
D:\code\smvc\mybatis-two>tree /f 卷 软件 的文件夹 PATH 列表 卷序列号为 0000-CD08 D:. │ .classpath │ .project │ pom.xml │ ├─.settings │ org.eclipse.core.resources.prefs │ org.eclipse.jdt.core.prefs │ org.eclipse.m2e.core.prefs │ ├─sql │ create.sql │ └─src ├─main │ ├─java │ │ └─com │ │ └─laolang │ │ ├─domain │ │ │ Address.java │ │ │ AddressMapper.xml │ │ │ Course.java │ │ │ CourseMapper.xml │ │ │ Person.java │ │ │ PersonMapper.xml │ │ │ Student.java │ │ │ StudentMapper.xml │ │ │ Tutor.java │ │ │ TutorMapper.xml │ │ │ │ │ ├─mapper │ │ │ AddressMapper.java │ │ │ CourseMapper.java │ │ │ PersonMapper.java │ │ │ StudentMapper.java │ │ │ TutorMapper.java │ │ │ │ │ ├─services │ │ │ AddressService.java │ │ │ CourseService.java │ │ │ PersonService.java │ │ │ StudentService.java │ │ │ TutorService.java │ │ │ │ │ └─util │ │ MybatisUtil.java │ │ │ └─resources │ │ jdbc.properties │ │ mybatis-config.xml │ │ │ └─com │ └─laolang │ └─domain │ AddressMapper.xml │ CourseMapper.xml │ PersonMapper.xml │ StudentMapper.xml │ TutorMapper.xml │ └─test ├─java │ └─com │ └─laolang │ └─services │ AddressServiceTest.java │ CourseServiceTest.java │ PersonServiceTest.java │ StudentServiceTest.java │ TutorServiceTest.java │ └─resources │ jdbc.properties │ mybatis-config.xml │ └─com └─laolang └─domain AddressMapper.xml CourseMapper.xml PersonMapper.xml StudentMapper.xml TutorMapper.xml D:\code\smvc\mybatis-two>
mybatis配置：
jdbc.properties
driver=com.mysql.jdbc.Driver url=jdbc:mysql://localhost:3306/mybatis_study username=root password=root
mybatis-config.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<!-- 加载 jdbc properties 文件 -->
<properties resource="jdbc.properties" />
<typeAliases>
<typeAlias alias="Student" type="com.laolang.domain.Student" />
<typeAlias alias="Address" type="com.laolang.domain.Address" />
<typeAlias alias="Person" type="com.laolang.domain.Person" />
<typeAlias alias="Course" type="com.laolang.domain.Course" />
<typeAlias alias="Tutor" type="com.laolang.domain.Tutor" />
</typeAliases>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC" />
<dataSource type="POOLED">
<property name="driver" value="${driver}" />
<property name="url" value="${url}" />
<property name="username" value="${username}" />
<property name="password" value="${password}" />
</dataSource>
</environment>
</environments>
<mappers>
<mapper resource="com/laolang/domain/StudentMapper.xml" />
<mapper resource="com/laolang/domain/AddressMapper.xml" />
<mapper resource="com/laolang/domain/PersonMapper.xml" />
<mapper resource="com/laolang/domain/CourseMapper.xml" />
<mapper resource="com/laolang/domain/TutorMapper.xml" />
</mappers>
</configuration>
实体类和Mapper.xml映射文件：
com.laolang.domain.Student
package com.laolang.domain;
public class Student {
public Student() {
super();
}
public Student(String name, int age, String sex) {
super();
this.name = name;
this.age = age;
this.sex = sex;
}
public Student(int id, String name, int age, String sex) {
super();
this.id = id;
this.name = name;
this.age = age;
this.sex = sex;
}
@Override
public String toString() {
return "Student [id=" + id + ", name=" + name + ", age=" + age
+ ", sex=" + sex + "]";
}
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;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
private int id;
private String name;
private int age;
private String sex;
}
com.laolang.domain.domain.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.laolang.mapper.StudentMapper">
<resultMap type="Student" id="StudentResult">
<id property="id" column="id"/>
<result property="name" column="name"/>
<result property="age" column="age"/>
<result property="sex" column="sex"/>
</resultMap>
<select id="selectAll" resultMap="StudentResult">
select id,name,age,sex from student
</select>
<select id="selectById" parameterType="int" resultType="Student">
select id,name,age,sex from student where id = #{id}
</select>
<select id="selectByName" parameterType="String" resultType="Student">
select id,name,age,sex from student where name = #{name}
</select>
<insert id="insertStudent" parameterType="Student" useGeneratedKeys="true" keyProperty="id">
insert into student ( name, age, sex ) values(#{name},#{age},#{sex})
</insert>
<update id="updateStudent" parameterType="Student">
update student set name = #{name} , age = #{age} , sex = #{age}
where id = #{id}
</update>
<delete id="deleteStudentById" parameterType="int">
delete from student where id = #{id}
</delete>
</mapper>
com.laolang.domain.Address
package com.laolang.domain;
public class Address {
public Address() {
super();
}
public Address(String street, String city, String zip) {
super();
this.street = street;
this.city = city;
this.zip = zip;
}
public Address(int id, String street, String city, String zip) {
super();
this.id = id;
this.street = street;
this.city = city;
this.zip = zip;
}
@Override
public String toString() {
return "Address [id=" + id + ", street=" + street + ", city=" + city
+ ", zip=" + zip + "]";
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getStreet() {
return street;
}
public void setStreet(String street) {
this.street = street;
}
public String getCity() {
return city;
}
public void setCity(String city) {
this.city = city;
}
public String getZip() {
return zip;
}
public void setZip(String zip) {
this.zip = zip;
}
private int id;
private String street;
private String city;
private String zip;
}
com.laolang.domain.AddressMapper.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.laolang.mapper.AddressMapper">
<resultMap type="Address" id="AddressResult">
<id property="id" column="addr_id" />
<result property="street" column="addr_street" />
<result property="city" column="addr_city" />
<result property="zip" column="addr_zip" />
</resultMap>
<select id="findAddresssById" parameterType="int" resultType="Address">
select
id,street,city,zip from address where
id = #{id}
</select>
</mapper>
com.laolang.domain.Person
package com.laolang.domain;
public class Person {
public Person() {
super();
}
public Person(String name, String email, String phone, Address address) {
super();
this.name = name;
this.email = email;
this.phone = phone;
this.address = address;
}
public Person(int id, String name, String email, String phone,
Address address) {
super();
this.id = id;
this.name = name;
this.email = email;
this.phone = phone;
this.address = address;
}
@Override
public String toString() {
return "Person [id=" + id + ", name=" + name + ", email=" + email
+ ", phone=" + phone + "]";
}
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;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
public Address getAddresss() {
return address;
}
public void setAddresss(Address addresss) {
this.address = addresss;
}
private int id;
private String name;
private String email;
private String phone;
private Address address;
}
com.laolang.domain.PersonMapper.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.laolang.mapper.PersonMapper">
<resultMap type="Address" id="AddressResult">
<id property="id" column="id" />
<result property="street" column="street" />
<result property="city" column="city" />
<result property="zip" column="zip" />
</resultMap>
<resultMap type="Person" id="PersonWithAddressResult">
<id property="id" column="id" />
<result property="name" column="name" />
<result property="email" column="email" />
<result property="phone" column="phone" />
<association property="address" column="addr_id"
select="com.laolang.mapper.AddressMapper.findAddresssById" />
</resultMap>
<select id="findPersonWithAddress" parameterType="int"
resultMap="PersonWithAddressResult">
select id,name,email,phone,addr_id from person where id = #{id}
</select>
<select id="findPersonById" parameterType="int" resultType="Person">
select id,name,email,phone from person where id = #{id}
</select>
</mapper>
com.laolang.domain.Tutor
package com.laolang.domain;
import java.util.List;
public class Tutor {
public Tutor() {
super();
}
public Tutor(String name, String email, String phone, Address address,
List<Course> courses) {
super();
this.name = name;
this.email = email;
this.phone = phone;
this.address = address;
this.courses = courses;
}
public Tutor(int id, String name, String email, String phone,
Address address, List<Course> courses) {
super();
this.id = id;
this.name = name;
this.email = email;
this.phone = phone;
this.address = address;
this.courses = courses;
}
@Override
public String toString() {
return "Tutor [id=" + id + ", name=" + name + ", email=" + email
+ ", phone=" + phone + "]";
}
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;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
public Address getAddress() {
return address;
}
public void setAddress(Address address) {
this.address = address;
}
public List<Course> getCourses() {
return courses;
}
public void setCourses(List<Course> courses) {
this.courses = courses;
}
private int id;
private String name;
private String email;
private String phone;
private Address address;
private List<Course> courses;
}
com.laolang.domain.TutorMapper.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.laolang.mapper.TutorMapper">
<resultMap type="Address" id="AddressResult">
<id property="id" column="id" />
<result property="street" column="street" />
<result property="city" column="city" />
<result property="zip" column="zip" />
</resultMap>
<resultMap type="Course" id="CourseResult">
<id property="id" column="cid" />
<result property="name" column="cname" />
<result property="description" column="description" />
<result property="startDate" column="start_date" jdbcType="DATE" javaType="java.util.Date"/>
<result property="endDate" column="end_date" jdbcType="DATE" javaType="java.util.Date"/>
<result property="tutorId" column="tutor_id" />
</resultMap>
<resultMap type="Tutor" id="TutorResult">
<id property="id" column="tid" />
<result property="name" column="tname" />
<result property="email" column="email" />
<result property="phone" column="phone" />
<collection property="courses" resultMap="CourseResult" />
</resultMap>
<select id="findTutorWithCourseById" parameterType="int"
resultMap="TutorResult">
select t.tid,t.tname,email,phone,c.cid,c.cname,c.description,start_date,end_date
from tutor t left outer join course c on
t.tid = c.tutor_id
where t.tid = #{id};
</select>
</mapper>
com.laolang.domain.Course
package com.laolang.domain;
import java.util.Date;
public class Course {
public Course() {
super();
}
public Course(String name, String desc, Date startDate, Date endDate,
int tutorId) {
super();
this.name = name;
this.description = desc;
this.startDate = startDate;
this.endDate = endDate;
this.tutorId = tutorId;
}
public Course(int id, String name, String description, Date startDate,
Date endDate, int tutorId) {
super();
this.id = id;
this.name = name;
this.description = description;
this.startDate = startDate;
this.endDate = endDate;
this.tutorId = tutorId;
}
@Override
public String toString() {
return "Course [id=" + id + ", name=" + name + ", description=" + description
+ ", startDate=" + startDate + ", endDate=" + endDate
+ ", tutorId=" + tutorId + "]";
}
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;
}
public String getDesc() {
return description;
}
public void setDesc(String desc) {
this.description = desc;
}
public Date getStartDate() {
return startDate;
}
public void setStartDate(Date startDate) {
this.startDate = startDate;
}
public Date getEndDate() {
return endDate;
}
public void setEndDate(Date endDate) {
this.endDate = endDate;
}
public int getTutorId() {
return tutorId;
}
public void setTutorId(int tutorId) {
this.tutorId = tutorId;
}
private int id;
private String name;
private String description;
private Date startDate;
private Date endDate;
private int tutorId;
}
com.laolang.domain.CourseMappeer.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.laolang.mapper.CourseMapper">
<resultMap type="Course" id="CourseResult">
<id property="id" column="cid" />
<result property="name" column="cname" />
<result property="description" column="description" />
<result property="startDate" column="start_date" jdbcType="DATE" javaType="java.util.Date"/>
<result property="endDate" column="end_date" jdbcType="DATE" javaType="java.util.Date"/>
<result property="tutorId" column="tutor_id" />
</resultMap>
<select id="findCourseById" parameterType="int" resultMap="CourseResult">
select cid,cname,description,start_date,end_date,tutor_id from course where cid = #{id};
</select>
</mapper>
Mapper接口
com.laolang.mapper.StudentMapper
package com.laolang.mapper;
import java.util.List;
import com.laolang.domain.Student;
public interface StudentMapper {
public List<Student> selectAll();
public Student selectById(int id);
public Student selectByName(String name);
public void insertStudent(Student student );
public void updateStudent(Student student );
public void deleteStudentById(int id );
}
com.laolang.mapper.AddressMapper
package com.laolang.mapper;
import com.laolang.domain.Address;
public interface AddressMapper {
public Address findAddresssById( int id );
}
com.laolang.mapper.PersonMapper
package com.laolang.mapper;
import com.laolang.domain.Person;
public interface PersonMapper {
public Person findPersonWithAddress( int id);
public Person findPersonById( int id );
}
com.laolang.mapper.TutorMapper
package com.laolang.mapper;
import com.laolang.domain.Tutor;
public interface TutorMapper {
public Tutor findTutorWithCourseById( int id );
}
com.laolang.mapper.CourseMapper
package com.laolang.mapper;
import com.laolang.domain.Course;
public interface CourseMapper {
public Course findCourseById( int id );
}
service层
com.laolang.services.StudentService
package com.laolang.services;
import java.util.List;
import org.apache.ibatis.session.SqlSession;
import com.laolang.domain.Student;
import com.laolang.mapper.StudentMapper;
import com.laolang.util.MybatisUtil;
public class StudentService {
public List<Student> selectAll() {
SqlSession session = MybatisUtil.openSession();
try {
StudentMapper studentMapper = session
.getMapper(StudentMapper.class);
return studentMapper.selectAll();
} finally {
session.close();
}
}
public Student selectById(int id) {
SqlSession session = MybatisUtil.openSession();
try {
StudentMapper studentMapper = session
.getMapper(StudentMapper.class);
return studentMapper.selectById(id);
} finally {
session.close();
}
}
public Student selectByName(String name) {
SqlSession session = MybatisUtil.openSession();
try {
StudentMapper studentMapper = session
.getMapper(StudentMapper.class);
return studentMapper.selectByName(name);
} finally {
session.close();
}
}
public void insertStudent(Student stu) {
SqlSession session = MybatisUtil.openSession();
try {
StudentMapper studentMapper = session
.getMapper(StudentMapper.class);
studentMapper.insertStudent(stu);
session.commit();
} finally {
session.close();
}
}
public void updateStudent(Student student) {
SqlSession session = MybatisUtil.openSession();
try {
StudentMapper studentMapper = session
.getMapper(StudentMapper.class);
studentMapper.updateStudent(student);
session.commit();
} finally {
session.close();
}
}
public void deleteStudentById(int id) {
SqlSession session = MybatisUtil.openSession();
try {
StudentMapper studentMapper = session
.getMapper(StudentMapper.class);
studentMapper.deleteStudentById(id);
session.commit();
} finally {
session.close();
}
}
}
com.laolang.services.AddressService
package com.laolang.services;
import org.apache.ibatis.session.SqlSession;
import com.laolang.domain.Address;
import com.laolang.mapper.AddressMapper;
import com.laolang.util.MybatisUtil;
public class AddressService {
public Address findAddresssById( int id ){
SqlSession session = MybatisUtil.openSession();
try {
AddressMapper addressMapper = session
.getMapper(AddressMapper.class);
Address address = addressMapper.findAddresssById(id);
if( address == null ){
System.out.println("未查询到address!!!");
}
return address;
} finally {
session.close();
}
}
}
com.laolang.services.PersonService
package com.laolang.services;
import org.apache.ibatis.session.SqlSession;
import com.laolang.domain.Person;
import com.laolang.mapper.PersonMapper;
import com.laolang.util.MybatisUtil;
public class PersonService {
public Person findPersonWithAddress( int id ){
SqlSession session = MybatisUtil.openSession();
try {
PersonMapper personMapper = session
.getMapper(PersonMapper.class);
return personMapper.findPersonWithAddress(id);
} finally {
session.close();
}
}
public Person findPersonById( int id ){
SqlSession session = MybatisUtil.openSession();
try {
PersonMapper personMapper = session
.getMapper(PersonMapper.class);
return personMapper.findPersonById(id);
} finally {
session.close();
}
}
}
com.laolang.service.TutorService
package com.laolang.services;
import org.apache.ibatis.session.SqlSession;
import com.laolang.domain.Tutor;
import com.laolang.mapper.TutorMapper;
import com.laolang.util.MybatisUtil;
public class TutorService {
public Tutor findTutorWithCourseById( int id ){
SqlSession session = MybatisUtil.openSession();
try {
TutorMapper tutorMapper = session
.getMapper(TutorMapper.class);
return tutorMapper.findTutorWithCourseById(id);
} finally {
session.close();
}
}
}
com.laolang.services.CourseService
package com.laolang.services;
import org.apache.ibatis.session.SqlSession;
import com.laolang.domain.Course;
import com.laolang.mapper.CourseMapper;
import com.laolang.util.MybatisUtil;
public class CourseService {
public Course findCourseById( int id ){
SqlSession session = MybatisUtil.openSession();
try {
CourseMapper courseMapper = session
.getMapper(CourseMapper.class);
return courseMapper.findCourseById(id);
} finally {
session.close();
}
}
}
mybatis工具类
com.laolang.util.MybatisUtil
package com.laolang.util;
import java.io.IOException;
import java.io.InputStream;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
public class MybatisUtil {
public static SqlSessionFactory getSqlSessionFactory(){
if( null == sqlSessionFactory ){
try {
InputStream is = Resources.getResourceAsStream("mybatis-config.xml");
sqlSessionFactory = new SqlSessionFactoryBuilder().build(is);
} catch (IOException e) {
e.printStackTrace();
}
}
return sqlSessionFactory;
}
public static SqlSession openSession(){
return getSqlSessionFactory().openSession();
}
private static SqlSessionFactory sqlSessionFactory;
}
测试类：
StudentServiceTest
package com.laolang.services;
import java.util.List;
import org.junit.BeforeClass;
import org.junit.Ignore;
import org.junit.Test;
import com.laolang.domain.Student;
public class StudentServiceTest {
@BeforeClass
public static void setUp() {
studentService = new StudentService();
}
// @Ignore
@Test
public void testSelectAll() {
System.out.println("-->查询所有-----------");
List<Student> students = studentService.selectAll();
for (Student stu : students) {
System.out.println(stu);
}
System.out.println("---------------------------\n\n");
}
// @Ignore
@Test
public void testSelectById() {
System.out.println("-->通过 id 查询-----------");
Student stu = studentService.selectById(1);
System.out.println(stu);
System.out.println("---------------------------\n\n");
}
@Ignore
@Test
public void testSelectByName() {
System.out.println("-->通过 name 查询-----------");
Student stu = studentService.selectByName("小代码");
System.out.println(stu);
System.out.println("---------------------------\n\n");
}
@Ignore
@Test
public void testInsertStudent() {
System.out.println("-->插入-----------");
String name = "天涯";
Student stu = new Student(name, 34, "男");
studentService.insertStudent(stu);
stu = studentService.selectByName(name);
System.out.println(stu);
System.out.println("---------------------------\n\n");
}
@Ignore
@Test
public void testUpdateStudent() {
System.out.println("-->修改-----------");
Student stu = studentService.selectById(1);
System.out.println();
stu.setName("xiaodaima");
studentService.updateStudent(stu);
stu = studentService.selectById(1);
System.out.println(stu);
System.out.println("---------------------------\n\n");
}
@Ignore
@Test
public void testDeleteStudentById() {
System.out.println("-->删除-----------");
List<Student> studentList = studentService.selectAll();
for( Student stu : studentList ){
System.out.println(stu);
}
studentService.deleteStudentById(7);
System.out.println("删除后：\n");
studentList = studentService.selectAll();
for( Student stu : studentList ){
System.out.println(stu);
}
System.out.println("---------------------------\n\n");
}
private static StudentService studentService;
}
com.laolang.services.AddressTest
package com.laolang.services;
import org.junit.BeforeClass;
import org.junit.Ignore;
import org.junit.Test;
import com.laolang.domain.Address;
public class AddressServiceTest {
@BeforeClass
public static void setUp(){
addressService = new AddressService();
}
// @Ignore
@Test
public void testFindAddressById(){
System.out.println("-->通过ID查询地址------");
Address address = addressService.findAddresssById(1);
System.out.println(address.toString());
System.out.println("---------------------\n\n");
}
private static AddressService addressService;
}
com.laolang.services.PersonServiceTest
package com.laolang.services;
import org.junit.BeforeClass;
import org.junit.Ignore;
import org.junit.Test;
import com.laolang.domain.Address;
import com.laolang.domain.Person;
import com.laolang.services.PersonService;
public class PersonServiceTest {
@BeforeClass
public static void setUp(){
personService = new PersonService();
}
// @Ignore
@Test
public void testFindPersonWithAddress(){
System.out.println("-->查询带地址的信息-----------");
Person p = personService.findPersonWithAddress(1);
Address a = p.getAddresss();
System.out.println("Person:"+p.toString()+" Address:" + a.toString());
System.out.println("-------------------------");
}
// @Ignore
@Test
public void testFindPersonById(){
System.out.println("-->查询信息-----------");
Person p = personService.findPersonById(1);
System.out.println("Person:"+p.toString());
System.out.println("-------------------------");
}
private static PersonService personService;
}
CourseServiceTest
package com.laolang.services;
import org.junit.BeforeClass;
import org.junit.Ignore;
import org.junit.Test;
import com.laolang.domain.Course;
public class CourseServiceTest {
@BeforeClass
public static void setUp(){
courseService = new CourseService();
}
// @Ignore
@Test
public void testFindCourseById(){
System.out.println("-->根据ID查询课程信息---------");
Course course = courseService.findCourseById(3);
System.out.println(course);
System.out.println("-------------------------");
}
private static CourseService courseService;
}
TourseServiceTest
package com.laolang.services;
import java.util.List;
import org.junit.BeforeClass;
import org.junit.Ignore;
import org.junit.Test;
import com.laolang.domain.Course;
import com.laolang.domain.Tutor;
public class TutorServiceTest {
@BeforeClass
public static void setUp(){
tutorService = new TutorService();
}
// @Ignore
@Test
public void testFindTutorWithCourseById(){
System.out.println("-->通过ID某教师所讲的课程------");
Tutor tutor = tutorService.findTutorWithCourseById(1);
List<Course> courses = tutor.getCourses();
for( Course c : courses ){
System.out.println(tutor.toString() + c.toString());
}
System.out.println("---------------------\n\n");
}
private static TutorService tutorService;
}
pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.laolang.mybatis-study</groupId>
<artifactId>mybatis-two</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>mybatis-two</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.6</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.2.2</version>
</dependency>
</dependencies>
</project>
测试结果：
D:\code\smvc\mybatis-two>mvn test [INFO] Scanning for projects... [INFO] [INFO] ------------------------------------------------------------------------ [INFO] Building mybatis-two 0.0.1-SNAPSHOT [INFO] ------------------------------------------------------------------------ [INFO] [INFO] --- maven-resources-plugin:2.4.3:resources (default-resources) @ mybatis-two --- [INFO] Using 'UTF-8' encoding to copy filtered resources. [INFO] Copying 7 resources [INFO] [INFO] --- maven-compiler-plugin:2.3.2:compile (default-compile) @ mybatis-two --- [INFO] Compiling 16 source files to D:\code\smvc\mybatis-two\target\classes [INFO] [INFO] --- maven-resources-plugin:2.4.3:testResources (default-testResources) @ mybatis-two --- [INFO] Using 'UTF-8' encoding to copy filtered resources. [INFO] Copying 7 resources [INFO] [INFO] --- maven-compiler-plugin:2.3.2:testCompile (default-testCompile) @ mybatis-two --- [INFO] Compiling 5 source files to D:\code\smvc\mybatis-two\target\test-classes [INFO] [INFO] --- maven-surefire-plugin:2.7.2:test (default-test) @ mybatis-two --- [INFO] Surefire report directory: D:\code\smvc\mybatis-two\target\surefire-reports ------------------------------------------------------- T E S T S ------------------------------------------------------- Running com.laolang.services.AddressServiceTest -->通过ID查询地址------ Address [id=1, street=长安街, city=洛阳, zip=123456] --------------------- Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.867 sec Running com.laolang.services.CourseServiceTest -->根据ID查询课程信息--------- Course [id=3, name=linux, description=linux开发, startDate=Sun Jan 03 00:00:00 CST 2010, endDate=Fri Dec 03 00:00:00 CST 2010, tutorId=2] ------------------------- Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.023 sec Running com.laolang.services.PersonServiceTest -->查询信息----------- Person:Person [id=1, name=长生, [email protected], phone=13318188181] ------------------------- -->查询带地址的信息----------- Person:Person [id=1, name=长生, [email protected], phone=13318188181] Address:Address [id=1, street=长安街, city=洛阳, zip=123456] ------------------------- Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.017 sec Running com.laolang.services.StudentServiceTest -->查询所有----------- Student [id=1, name=xiaodaima, age=23, sex=23] Student [id=2, name=laolang, age=23, sex=男] Student [id=3, name=老狼, age=33, sex=男] Student [id=4, name=行者, age=26, sex=男] Student [id=5, name=tianya, age=34, sex=man]] --------------------------- -->通过 id 查询----------- Student [id=1, name=xiaodaima, age=23, sex=23] --------------------------- Tests run: 6, Failures: 0, Errors: 0, Skipped: 4, Time elapsed: 0.018 sec Running com.laolang.services.TutorServiceTest -->通过ID某教师所讲的课程------ Tutor [id=1, name=陈老师, [email protected], phone=12345677654]Course [id=1, name=javase, description=javase开发, startDate=Sun Jan 03 00:00:00 CST 2010, endDate=Fri Dec 03 00:00:00 CST 2010, tutorId=0] Tutor [id=1, name=陈老师, [email protected], phone=12345677654]Course [id=4, name=php, description=php开发, startDate=Sun Jan 03 00:00:00 CST 2010, endDate=Fri Dec 03 00:00:00 CST 2010, tutorId=0] Tutor [id=1, name=陈老师, [email protected], phone=12345677654]Course [id=7, name=vb.net, description=vb.net开发, startDate=Sun Jan 03 00:00:00 CST 2010, endDate=Fri Dec 03 00:00:00 CST 2010, tutorId=0] Tutor [id=1, name=陈老师, [email protected], phone=12345677654]Course [id=9, name=delphi, description=delphi开发, startDate=Sun Jan 03 00:00:00 CST 2010, endDate=Fri Dec 03 00:00:00 CST 2010, tutorId=0] --------------------- Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.024 sec Results : Tests run: 11, Failures: 0, Errors: 0, Skipped: 4 [INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESS [INFO] ------------------------------------------------------------------------ [INFO] Total time: 4.292s [INFO] Finished at: Mon Mar 14 09:59:35 CST 2016 [INFO] Final Memory: 6M/14M [INFO] ------------------------------------------------------------------------ D:\code\smvc\mybatis-two>
需要注意的点：
1、xml配置文件不能写错，不然会有各种资源找不到的错误
2、数据库中不能有名字相同的列，不然的话，联合查询的时候会出问题
3、ID字段绝对不能只以ID为名，不然联合查询就只有一条数据