SpringBoot整合Mybatis及分頁外掛pageHelper和事務
阿新 • • 發佈:2019-01-28
spring事務分類:
1.宣告事務
2.程式設計事務
spring事務原理:AOP技術 環繞通知進行攔截
使用spring事務的注意事項:不要Try。因為要將異常丟擲給外層
Springboot預設整合事務,只要在方法上加上@Transactional註解
pom.xml配置檔案:
<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>cn.e3mall</groupId> <artifactId>springboot-pageHelper</artifactId> <version>0.0.1-SNAPSHOT</version> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.0.0.RELEASE</version> </parent> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter</artifactId> </dependency> <!-- 測試 --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>1.1.1</version> </dependency> <!-- MySQL依賴 --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> </dependency> <!-- springboot web元件 --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <!-- jta+atomikos解決傳統分散式事務 --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-jta-atomikos</artifactId> </dependency> <!-- pagehelper一個mybtis分頁外掛 --> <dependency> <groupId>com.github.pagehelper</groupId> <artifactId>pagehelper-spring-boot-starter</artifactId> <version>1.2.5</version> </dependency> <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-lang3</artifactId> </dependency> </dependencies> </project>
在application.properties配置檔案中配置資料來源:
spring.datasource.url=jdbc:mysql://localhost:3306/springboot spring.datasource.username=root spring.datasource.password=123456 spring.datasource.driver-class-name=com.mysql.jdbc.Driver logging.level.com.example.demo.dao=DEBUG pagehelper.helperDialect=mysql pagehelper.reasonable=true pagehelper.supportMethodsArguments=true pagehelper.params=count=countSql pagehelper.page-size-zero=true
Dao層UserMapper.java:
//@Mapper
public interface UserMapper {
@Select("select * from user where name=#{name}")
User findByName(@Param("name")String name);
@Insert("insert into user(name,age) values(#{name},#{age})")
int insert(@Param("name")String name,@Param("age")Integer age);
}
Service層UserService.java:
@Service
public class UserService {
@Autowired
private UserMapper userMapper;
@Transactional
//@Datasource(ref="datasource1")
public int insertUser(String name,Integer age) {
int insertUserResult=userMapper.insert(name, age);
int i=1/age;
System.out.println(insertUserResult);
//怎麼驗證事務開啟成功
return insertUserResult;
}
}
web層UserController.java:
@RestController
public class UserController {
@Autowired
private UserService userService;
@RequestMapping("/insertUser")
public Integer insertUser(String name,Integer age) {
return userService.insertUser(name, age);
}
}
啟動類:
@SpringBootApplication
@MapperScan(basePackages= {"com.itmayiedu.mapper"})
public class MyBatisApp01 {
public static void main(String[] args) {
SpringApplication.run(MyBatisApp01.class,args);
}
}
實體類在這裡就省略了。
下面是整合mybatis的pagehelper分頁外掛
IndexController.java:
@RestController
public class IndexController {
@Autowired
private UserService userService;
@RequestMapping("/index")
public PageInfo<User> findUserList(int page,int pageSize){
return userService.findUserList(page, pageSize);
}
UserService.java:
@Service
public class UserService {
@Autowired
private UserMapper userMapper;
//page當前頁,pagesize表示當前展示多少個
public PageInfo<User> findUserList(int page,int pageSize){
//mysql查詢 limit,oracle 偽列 sqlserver top
//pagehelper幫我們生成分頁語句
PageHelper.startPage(page,pageSize);//底層實現原理是改寫sql語句
List<User>listUser=userMapper.findUserList();
//返回個客戶端封裝一些page物件
PageInfo<User> pageInfoUserList=new PageInfo<User>(listUser);
return pageInfoUserList;
}
}
UserMapper.java:
public interface UserMapper {
@Select("select * from user")
List<User>findUserList();
}