7. 使用注解的方式实现增删改查
8. 使用注解的方式实现关系映射
<!-- srcmybatis-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>
<properties resource="jdbc.properties"/>
<typeAliases>
<package name="com.java1234.model"/>
</typeAliases>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC" />
<dataSource type="POOLED">
<property name="driver" value="${jdbc.driverClassName}" />
<property name="url" value="${jdbc.url}" />
<property name="username" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
</dataSource>
</environment>
<environment id="test">
<transactionManager type="JDBC" />
<dataSource type="POOLED">
<property name="driver" value="${jdbc.driverClassName}" />
<property name="url" value="${jdbc.url}" />
<property name="username" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
</dataSource>
</environment>
</environments>
<mappers>
<package name="com.java1234.mappers"/>
</mappers>
</configuration>
# srcjdbc.properties
jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/db_mybatis
jdbc.username=root
jdbc.password=123456
# srclog4j.properties
log4j.rootLogger=info,appender1,appender2
log4j.appender.appender1=org.apache.log4j.ConsoleAppender
log4j.appender.appender2=org.apache.log4j.FileAppender
log4j.appender.appender2.File=C:/logFile.txt
log4j.appender.appender1.layout=org.apache.log4j.TTCCLayout
log4j.appender.appender2.layout=org.apache.log4j.TTCCLayout
// srccomjava1234mappersAddressMapper.java
package com.java1234.mappers;
import org.apache.ibatis.annotations.Select;
import com.java1234.model.Address;
public interface AddressMapper {
@Select("select * from t_address where id=#{id}")
public Address findById(Integer id);
}
// srccomjava1234mappersGradeMapper.java
package com.java1234.mappers;
import org.apache.ibatis.annotations.Many;
import org.apache.ibatis.annotations.One;
import org.apache.ibatis.annotations.Result;
import org.apache.ibatis.annotations.Results;
import org.apache.ibatis.annotations.Select;
import com.java1234.model.Grade;
public interface GradeMapper {
@Select("select * from t_grade where id=#{id}")
@Results(
{
@Result(id=true,column="id",property="id"),
@Result(column="gradeName",property="gradeName"),
@Result(column="id",property="students",many=@Many(select="com.java1234.mappers.StudentMapper.selectStudentByGradeId"))
}
)
public Grade findById(Integer id);
}
// srccomjava1234mappersStudentMapper.java
package com.java1234.mappers;
import java.util.List;
import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.One;
import org.apache.ibatis.annotations.Result;
import org.apache.ibatis.annotations.Results;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;
import com.java1234.model.Student;
public interface StudentMapper {
@Insert("insert into t_student values(null,#{name},#{age})")
public int insertStudent(Student student);
@Update("update t_student set name=#{name},age=#{age} where id=#{id}")
public int updateStudent(Student student);
@Delete("delete from t_student where id=#{id}")
public int deleteStudent(int id);
@Select("select * from t_student where id=#{id}")
public Student getStudentById(Integer id);
@Select("select * from t_student")
@Results(
{
@Result(id=true,column="id",property="id"),
@Result(column="name",property="name"),
@Result(column="age",property="age")
}
)
public List<Student> findStudents();
@Select("select * from t_student where id=#{id}")
@Results(
{
@Result(id=true,column="id",property="id"),
@Result(column="name",property="name"),
@Result(column="age",property="age"),
@Result(column="addressId",property="address",one=@One(select="com.java1234.mappers.AddressMapper.findById"))
}
)
public Student selectStudentWithAddress(int id);
@Select("select * from t_student where gradeId=#{gradeId}")
@Results(
{
@Result(id=true,column="id",property="id"),
@Result(column="name",property="name"),
@Result(column="age",property="age"),
@Result(column="addressId",property="address",one=@One(select="com.java1234.mappers.AddressMapper.findById"))
}
)
public Student selectStudentByGradeId(int gradeId);
@Select("select * from t_student where id=#{id}")
@Results(
{
@Result(id=true,column="id",property="id"),
@Result(column="name",property="name"),
@Result(column="age",property="age"),
@Result(column="addressId",property="address",one=@One(select="com.java1234.mappers.AddressMapper.findById")),
@Result(column="gradeId",property="grade",one=@One(select="com.java1234.mappers.GradeMapper.findById"))
}
)
public Student selectStudentWithAddressAndGrade(int id);
}
// srccomjava1234modelAddress.java
package com.java1234.model;
public class Address {
private Integer id;
private String sheng;
private String shi;
private String qu;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getSheng() {
return sheng;
}
public void setSheng(String sheng) {
this.sheng = sheng;
}
public String getShi() {
return shi;
}
public void setShi(String shi) {
this.shi = shi;
}
public String getQu() {
return qu;
}
public void setQu(String qu) {
this.qu = qu;
}
@Override
public String toString() {
return "Address [id=" + id + ", sheng=" + sheng + ", shi=" + shi
+ ", qu=" + qu + "]";
}
}
// srccomjava1234modelGrade.java
package com.java1234.model;
import java.util.List;
public class Grade {
private Integer id;
private String gradeName;
private List<Student> students;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getGradeName() {
return gradeName;
}
public void setGradeName(String gradeName) {
this.gradeName = gradeName;
}
public List<Student> getStudents() {
return students;
}
public void setStudents(List<Student> students) {
this.students = students;
}
@Override
public String toString() {
return "Grade [id=" + id + ", gradeName=" + gradeName +"]";
}
}
// srccomjava1234modelStudent.java
package com.java1234.model;
public class Student {
private Integer id;
private String name;
private Integer age;
private Address address;
private Grade grade;
public Student() {
super();
// TODO Auto-generated constructor stub
}
public Student(Integer id, String name, Integer age) {
super();
this.id = id;
this.name = name;
this.age = age;
}
public Student(String name, Integer age) {
super();
this.name = name;
this.age = 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 Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
public Address getAddress() {
return address;
}
public void setAddress(Address address) {
this.address = address;
}
public Grade getGrade() {
return grade;
}
public void setGrade(Grade grade) {
this.grade = grade;
}
@Override
public String toString() {
return "Student [id=" + id + ", name=" + name + ", age=" + age
+ ", address=" + address + ", grade=" + grade + "]";
}
}
// srccomjava1234serviceStudentTest.java
package com.java1234.service;
import java.util.List;
import org.apache.ibatis.session.SqlSession;
import org.apache.log4j.Logger;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import com.java1234.mappers.StudentMapper;
import com.java1234.model.Student;
import com.java1234.util.SqlSessionFactoryUtil;
public class StudentTest {
private static Logger logger=Logger.getLogger(StudentTest.class);
private SqlSession sqlSession=null;
private StudentMapper studentMapper=null;
/**
* 测试方法前调用
* @throws Exception
*/
@Before
public void setUp() throws Exception {
sqlSession=SqlSessionFactoryUtil.openSession();
studentMapper=sqlSession.getMapper(StudentMapper.class);
}
/**
* 测试方法后调用
* @throws Exception
*/
@After
public void tearDown() throws Exception {
sqlSession.close();
}
@Test
public void testInsert() {
logger.info("添加学生");
Student student=new Student("琪琪",11);
studentMapper.insertStudent(student);
sqlSession.commit();
}
@Test
public void testUpdate() {
logger.info("更新学生");
Student student=new Student(6,"琪琪2",12);
studentMapper.updateStudent(student);
sqlSession.commit();
}
@Test
public void testDelete() {
logger.info("删除学生");
studentMapper.deleteStudent(6);
sqlSession.commit();
}
@Test
public void testGetById() {
logger.info("通过ID查找学生");
Student student=studentMapper.getStudentById(1);
System.out.println(student);
}
@Test
public void testFindStudents() {
logger.info("查找所有学生");
List<Student> studentList=studentMapper.findStudents();
for(Student student:studentList){
System.out.println(student);
}
}
}
// srccomjava1234serviceStudentTest2.java
package com.java1234.service;
import java.util.List;
import org.apache.ibatis.session.SqlSession;
import org.apache.log4j.Logger;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import com.java1234.mappers.GradeMapper;
import com.java1234.mappers.StudentMapper;
import com.java1234.model.Grade;
import com.java1234.model.Student;
import com.java1234.util.SqlSessionFactoryUtil;
public class StudentTest2 {
private static Logger logger=Logger.getLogger(StudentTest2.class);
private SqlSession sqlSession=null;
private StudentMapper studentMapper=null;
private GradeMapper gradeMapper=null;
/**
* 测试方法前调用
* @throws Exception
*/
@Before
public void setUp() throws Exception {
sqlSession=SqlSessionFactoryUtil.openSession();
studentMapper=sqlSession.getMapper(StudentMapper.class);
gradeMapper=sqlSession.getMapper(GradeMapper.class);
}
/**
* 测试方法后调用
* @throws Exception
*/
@After
public void tearDown() throws Exception {
sqlSession.close();
}
@Test
public void testSelectStudentWithAddress() {
logger.info("查找学生(带地址)");
Student student=studentMapper.selectStudentWithAddress(3);
System.out.println(student);
}
@Test
public void testSelectGradeWithStudents() {
logger.info("查找年级(带学生)");
Grade grade=gradeMapper.findById(2);
System.out.println(grade);
List<Student> studentList=grade.getStudents();
for(Student student:studentList){
System.out.println(student);
}
}
@Test
public void testSelectStudentWithAddressAndGrade() {
logger.info("查找学生(带年级,带地址)");
Student student=studentMapper.selectStudentWithAddressAndGrade(1);
System.out.println(student);
}
}
// srccomjava1234utilSqlSessionFactoryUtil.java
package com.java1234.util;
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 SqlSessionFactoryUtil {
private static SqlSessionFactory sqlSessionFactory;
public static SqlSessionFactory getSqlSessionFactory(){
if(sqlSessionFactory==null){
InputStream inputStream=null;
try{
inputStream=Resources.getResourceAsStream("mybatis-config.xml");
sqlSessionFactory=new SqlSessionFactoryBuilder().build(inputStream);
}catch(Exception e){
e.printStackTrace();
}
}
return sqlSessionFactory;
}
public static SqlSession openSession(){
return getSqlSessionFactory().openSession();
}
}