一.導入jar包

org.springframework.boot

spring-boot-starter-web

org.springframework.boot

spring-boot-starter-test

mysql

mysql-connector-java

org.mybatis.spring.boot

mybatis-spring-boot-starter

1.1.1

com.github.pagehelper

pagehelper

4.1.0

2.創建啟動類App.java

@SpringBootApplication

@MapperScan("cn.itsource.springboot.employee.mapper")//掃描Mapper的路徑

public class SSMApplication {

public static void main(String[] args) {

SpringApplication.run(SSMApplication.class);

}

}

3.在application.yml添加配置文件

spring:

datasource:

url: jdbc:mysql://localhost:3306/test

driver-class-name: com.mysql.jdbc.Driver

password: root

username: root

mybatis:

type-aliases-package: cn.itsource.springboot.employee.domain,cn.itsource.springboot.employee.query

4.編寫DemoMapper

public interface UserMapper {

void save(User user);

List queryPage(UserQuery query);

}

5.編寫DemoService

@Service

@Transactional(propagation = Propagation.SUPPORTS,readOnly = true)//類級別是只讀事務

public class UserServiceImpl implements IUserService {

@Autowired

private UserMapper userMapper;

@Transactional(propagation = Propagation.REQUIRED,readOnly = false)

//@Transactional 后兩個配置是默認值

@Override

public void add(User user) {

userMapper.save(user);

// int i = 1/0;

}

@Override

public List queryPage(UserQuery query) {

PageHelper.startPage(1, 2); //limit (pageNum-1)*pageSize,pageSize

return userMapper.queryPage(query);

}

}

6.編寫Test

@RunWith(SpringRunner.class)

@SpringBootTest(classes = SSMApplication.class)

public class IUserServiceTest {

@Autowired

private IUserService userService;

@Test

public void add()

{

User ww = new User("ww");

System.out.println(ww);//沒有id

userService.add(ww);

System.out.println(ww);//有id

}

@Test

public void testList() throws Exception{

//com.github.pagehelper.Page --->PageList(currentPage,pageSizs,totalRecords,totalpages,Data)

Page list = (Page) userService.queryPage(new UserQuery());

System.out.println(list.getClass());

System.out.println("總記錄數:"+list.getTotal());

System.out.println("總頁數:"+list.getPages());

System.out.println("當前頁"+list.getPageNum());

System.out.println("每頁多少條:"+list.getPageSize());

for (User o : list) {

System.out.println(o);

}

}

}

xml版本的xml(獲取自增Id)

/p>

"http://mybatis.org/dtd/mybatis-3-mapper.dtd">

//獲取自增Id

insert into t_user(name) values(#{name})

SELECT * FROM t_user

annotation版本(獲取自增Id)

public interface UserMapper {

@Insert("insert into t_user(name) values(#{name})")

@Options(useGeneratedKeys = true,keyProperty = "id",keyColumn = "id")//獲取自增Id

void save(User user);

}

分頁插件的配置

@Configuration //相當于我們建了applicationContext-xxx.xml

public class MyBatisConfiguration {

//相當于配置了一個bean

@Bean

public PageHelper pageHelper() {

System.out.println("MyBatisConfiguration.pageHelper()");

PageHelper pageHelper = new PageHelper();

Properties p = new Properties();

p.setProperty("offsetAsPageNum", "true");

p.setProperty("rowBoundsWithCount", "true");

p.setProperty("reasonable", "true");

pageHelper.setProperties(p);

return pageHelper;

}

}

總結

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