springboot整合MyBatis及事务管理
本文使用xml版 Spring Boot整合MyBatis
目录
目录
1、依赖
2、application.yml
3、建表
4、实体类：User
5、UserDao
6、UserMapper.xml
7、UserService
8、UserServiceImpl
9、UserController
10、用postman测试
11、解决的bug
12、事务管理
1、依赖
4.0.0
org.springframework.boot
spring-boot-starter-parent
2.1.3.RELEASE
com.zj
springboot-mybatis-annotation
0.0.1-SNAPSHOT
springboot-mybatis-annotation
Demo project for Spring Boot
1.8
org.springframework.boot
spring-boot-starter-jdbc
org.springframework.boot
spring-boot-starter-web
org.mybatis.spring.boot
mybatis-spring-boot-starter
2.0.0
mysql
mysql-connector-java
runtime
org.springframework.boot
spring-boot-starter-test
test
com.alibaba
druid-spring-boot-starter
1.1.9
com.github.pagehelper
pagehelper-spring-boot-starter
1.2.5
org.springframework.boot
spring-boot-maven-plugin
2、application.yml
server:
port: 8080
spring:
datasource:
name: mysql_test
type: com.alibaba.druid.pool.DruidDataSource
#druid相关配置
druid:
#监控统计拦截的filters
filters: stat
# driver-class-name: com.mysql.jdbc.Driver
driver-class-name: com.mysql.cj.jdbc.Driver
#基本属性
url: jdbc:mysql://127.0.0.1:3306/springboot_study?useUnicode=true&characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull&allowMultiQueries=true&useSSL=false&serverTimezone=GMT%2B8
username: root
password: 123456
#配置初始化大小/最小/最大
initial-size: 1
min-idle: 1
max-active: 20
#获取连接等待超时时间
max-wait: 60000
#间隔多久进行一次检测，检测需要关闭的空闲连接
time-between-eviction-runs-millis: 60000
#一个连接在池中最小生存的时间
min-evictable-idle-time-millis: 300000
validation-query: SELECT 'x'
test-while-idle: true
test-on-borrow: false
test-on-return: false
#打开PSCache，并指定每个连接上PSCache的大小。oracle设为true，mysql设为false。分库分表较多推荐设置为false
pool-prepared-statements: false
max-pool-prepared-statement-per-connection-size: 20
## 该配置节点为独立的节点，有很多人容易将这个配置放在spring的节点下，导致配置无法被识别
mybatis:
mapper-locations: classpath:mapper/*.xml #注意：一定要对应mapper映射xml文件的所在路径
type-aliases-package: com.zj.springbootmybatisannotation.model # 注意：对应实体类的路径
#pagehelper
pagehelper:
helperDialect: mysql
reasonable: true
supportMethodsArguments: true
params: count=countSql
returnPageInfo: check把数据库改成自己的
注意一下目录结构：
同时修改启动类： SpringbootMybatisAnnotationApplication
@SpringBootApplication
@MapperScan("com.zj.springbootmybatisannotation.dao")
public class SpringbootMybatisAnnotationApplication {
public static void main(String[] args) {
SpringApplication.run(SpringbootMybatisAnnotationApplication.class, args);
}
}注意：@MapperScan("com.zj.springbootmybatisannotation.dao")这个注解，这个对应了项目中mapper（dao）所对应的包路径，
3、建表
SET FOREIGN_KEY_CHECKS=0;
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`username` varchar(255) DEFAULT NULL,
`age` int(11) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=utf8;
INSERT INTO `user` VALUES ('1', 'aaa', '18');
INSERT INTO `user` VALUES ('2', 'bbb', '18');
INSERT INTO `user` VALUES ('3', 'ccc', '20');
INSERT INTO `user` VALUES ('4', 'ddd', '24');
INSERT INTO `user` VALUES ('5', '111', null);4、实体类：User
public class User {
private Integer id;
private String username;
private Integer age;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
@Override
public String toString() { //重写toString() 方法，便于打印消息
return String.format("User[id=%d, username='%s', age=%d]",
id, username, age);
}5、UserDao
public interface UserDao {
int insert(User record);
List selectUsers();
} 6、UserMapper.xml
user
id,username,age
INSERT INTO
username,age
#{username, jdbcType=VARCHAR},#{age, jdbcType=VARCHAR}
7、UserService
public interface UserService {
int addUser(User user);
PageInfo findAllUser(int pageNum, int pageSize);
} 8、UserServiceImpl
@Service(value = "UserService")
public class UserServiceImpl implements UserService{
@Autowired
private UserDao userDao;//这里会报错，但是并不会影响
@Override
public int addUser(User user) {
return userDao.insert(user);
}
@Override
public PageInfo findAllUser(int pageNum, int pageSize) {
//将参数传给这个方法就可以实现物理分页了，非常简单。
PageHelper.startPage(pageNum, pageSize);
List userDomains = userDao.selectUsers();
PageInfo result = new PageInfo(userDomains);
return result;
}
} 9、UserController
@RestController
public class UserController {
@Autowired
private UserService userService;
@PostMapping("/add")
public int addUser(User user){
return userService.addUser(user);
}
@GetMapping("/all")
public Object findAllUser(
@RequestParam(name = "pageNum", required = false, defaultValue = "1")
int pageNum,
@RequestParam(name = "pageSize", required = false, defaultValue = "10")
int pageSize){
return userService.findAllUser(pageNum,pageSize);
}
}10、用postman测试
11、解决的bug
解决bug:
java.sql.SQLException: The server time zone value 'Öйú±ê׼ʱ¼ä' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver
https://blog.csdn.net/qq_15653601/article/details/79940090
12、事务管理
springboot 开启事物很简单，只需要加一行注解就可以了，前提你用的是jdbctemplate, jpa, mybatis，这种常见的orm。
@GetMapping("/test")
@Transactional
public Object test1111111() throws Exception{
User user = new User();
user.setUsername( "xxxx" );
user.setAge( 18 );
userService.addUser( user );
int i=1/0;
User user1 = new User();
user1.setUsername( "yyyy" );
user1.setAge( 22 );
userService.addUser( user1 );
return "插入成功";
}当代码运行到第一个addUser时，数据库插入数据，但出现异常时，数据库回滚，数据库什么也没有插入。