文章目錄
1.在pom.xml文件中添加pom依賴
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.1</version>
</dependency>
2.在application.properties添加mybatis配置項
#mybatis
#是否打印sql語句
#spring.jpa.show-sql= true
mybatis.type-aliases-package=com.ljs.miaosha.domain
#mybatis.type-handlers-package=com.example.typehandler
#下劃線轉換爲駝峯
mybatis.configuration.map-underscore-to-camel-case=true
mybatis.configuration.default-fetch-size=100
#ms --3000ms--->3s
mybatis.configuration.default-statement-timeout=3000
#mybatis配置文件路徑
#mapperLocaitons
mybatis.mapper-locaitons=classpath:com/ljs/miaosha/dao/*.xml
注意：光有mybatis還是不能訪問數據庫，還需要數據源。
3.配置數據源和連接池druid
#druid連接池
spring.datasource.url=jdbc:mysql://localhost/miaosha?useUnicode=true&characterEncoding=utf8&useSSL=false
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.filters=stat
# 初始化大小，最小，最大數據源
spring.datasource.initialSize=100
spring.datasource.minIdle=500
spring.datasource.maxActive=1000
spring.datasource.maxWait=60000
spring.datasource.timeBetweenEvictionRunsMillis=60000
spring.datasource.minEvictableIdleTimeMillis=30000
spring.datasource.validationQuery=select 'x'
spring.datasource.testWhileIdle=true
spring.datasource.testOnBorrow=false
spring.datasource.testOnReturn=false
spring.datasource.poolPreparedStatements=true
spring.datasource.maxPoolPreparedStatementPerConnectionSize=20
4.引入jdbc和druid的依賴
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.0.5</version>
</dependency>
5.測試
- 新建miaosha數據庫,創建測試表t_user,並寫入兩條數據。
create table t_user
(
id BIGINT(20) primary key not null auto_increment,
name varchar(16) DEFAULT NULL
);
- 在controller裏面寫一個請求測試,創建一個UserService，並且注入到controller裏面
@Controller
@RequestMapping("/demo")//注意！！！加了一個路徑
public class DemoController {
@Autowired
UserService userService;
@RequestMapping("/db/get")
@ResponseBody
public Result<User> dbGet() {//0代表成功
User user=userService.getById(1);
System.out.println("res:"+user.getName());
return Result.success(user);
}
}
- Service代碼，UserService 裏面注入userDao
@Service
public class UserService {
@Autowired
UserDao userDao;
public User getById(int id) {
return userDao.getById(id);
}
//使用事務
@Transactional
public boolean tx() {
User user=new User();
user.setId(3);
user.setName("ljs");
userDao.insert(user);
User user1=new User();
user1.setId(1);
user1.setName("ljs2");
userDao.insert(user1); //這裏出問題則回滾
return true;
}
}
- userDao代碼，直接使用註解，不需要再去配置xml文件。
@Mapper
public interface UserDao {
@Select("select * from t_user where id=#{id}")//@Param("id")進行引用
public User getById(@Param("id")int id);
@Insert("insert into t_user(id,name) values(#{id},#{name})") //id爲自增的，所以可以不用設置id
public void insert(User user);
}
- User Bean
public class User {
private int id;
private String name;
public User() {
}
public User(int id,String name) {
this.id=id;
this.name=name;
}
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;
}
}