org.mybatis.spring.boot
mybatis-spring-boot-starter
2.1.1
三、无配置注解版
============
1、添加maven文件
org.springframework.boot
spring-boot-starter-data-jdbc
org.springframework.boot
spring-boot-starter-web
org.mybatis.spring.boot
mybatis-spring-boot-starter
2.1.1
com.oracle.ojdbc
ojdbc8
runtime
com.alibaba
druid
1.1.21
log4j
log4j
1.2.17
2、application.yml添加相关配置
spring:
datasource:
username: mine
password: mine
url: jdbc:oracle:thin:@127.0.0.1:1521:orcl
driver-class-name: oracle.jdbc.driver.OracleDriver
type: com.alibaba.druid.pool.DruidDataSource
initialSize: 5
minIdle: 5
maxActive: 20
maxWait: 60000
timeBetweenEvictionRunsMillis: 60000
minEvictableIdleTimeMillis: 300000
validationQuery: SELECt 1 FROM DUAL
testWhileIdle: true
testOnBorrow: false
testOnReturn: false
poolPreparedStatements: true
filters: stat,wall,log4j
maxPoolPreparedStatementPerConnectionSize: 20
useGlobalDataSourceStat: true
connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500
Spring Boot 会自动加载spring.datasource.*相关配置,数据源就会自动注入到 sqlSessionFactory 中,sqlSessionFactory 会自动注入到 Mapper 中,对了,你一切都不用管了,直接拿起来使用就行了。
在启动类中添加对 mapper 包扫描@MapperScan
@MapperScan(value=“com.demo.mapper”)
@SpringBootApplication
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}
或者直接在 Mapper 类上面添加注解@Mapper,建议使用上面那种,不然每个 mapper 加个注解也挺麻烦的
3、controller
@RestController
public class DeptController {
@Autowired
DepartmentMapper departmentMapper;
@GetMapping("/dept/{id}")
public Department getDepartment(@PathVariable(“id”) Integer id){
return departmentMapper.getDeptById(id);
}
@GetMapping("/dept")
public int insertDeptById(@PathVariable(“id”) Integer id,@PathVariable(“departmentName”) String departmentName){
int ret = departmentMapper.insertDept(id,departmentName);
return ret;
}
}
4、开发mapper
package com.demo.mapper;
import com.demo.bean.Department;
import org.apache.ibatis.annotations.*;
public interface DepartmentMappe
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r {
@Select(“select * from SSH_DEPARTMENT where id=#{id}”)
public Department getDeptById(Integer id);
@Delete(“delete from SSH_DEPARTMENT where id=#{id}”)
public int deleteDeptById(Integer id);
@Options(useGeneratedKeys = true,keyProperty = “id”)
@Insert(“insert into SSH_DEPARTMENT(department_name) values(#{departmentName})”)
public int insertDept(Department department);
@Update(“update SSH_DEPARTMENT set departmentName=#{DEPARTMENT_NAME} where id=#{id}”)
public int updateDept(Department department);
}
-
@Select 是查询类的注解,所有的查询均使用这个
-
@Result 修饰返回的结果集,关联实体类属性和数据库字段一一对应,如果实体类属性和数据库属性名保持一致,就不需要这个属性来修饰。
-
@Insert 插入数据库使用,直接传入实体类会自动解析属性到对应的值
-
@Update 负责修改,也可以直接传入对象
-
@delete 负责删除
5、运行
上面三步就基本完成了相关 Mapper 层开发,使用的时候当作普通的类注入进入就可以了
(1)查询 (2)插入- 插入前数据库状态
- 浏览器调用controller执行插入
- 插入后结果查询
四、极简XML版本
=============
极简 xml 版本保持映射文件的老传统,接口层只需要定义空方法,系统会自动根据方法名在映射文件中找对应的 Sql
1、配置
pom 文件和上个版本一样,只是application.yml新增以下配置
mybatis.config-location=classpath:mybatis/mybatis-config.xml
mybatis.mapper-locations=classpath:mybatis/mapper/*.xml
mybatis-config.xml 配置



