Spring Boot集成mybatis

1.新建maven project

2.在pom.xml文件中引入相关依赖

（1）基本依赖，jdk版本号；
（2）mysql驱动，mybatis依赖包，mysql分页PageHelper:
<!-- mysql 数据库驱动. -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>

<!--
spring-boot mybatis依赖：
请不要使用1.0.0版本，因为还不支持拦截器插件，
1.1.1 是博主写帖子时候的版本，大家使用最新版本即可
-->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.1.1</version>
</dependency>
<!--
MyBatis提供了拦截器接口，我们可以实现自己的拦截器，
将其作为一个plugin装入到SqlSessionFactory中。
Github上有位开发者写了一个分页插件
Github项目地址： https://github.com/pagehelper/Mybatis-PageHelper -->
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper</artifactId>
<version>4.1.0</version>
</dependency>

创建启动类App.java

@SpringBootApplication
@MapperScan("com.*.mapper")
public class App {
public static void main(String[] args) {
SpringApplication.run(App.class, args);
}
}

//这里和以往不一样的地方就是MapperScan的注解，这个是会扫描该包下的接口

在application.properties添加配置文件

########################################################
###datasource
########################################################
spring.datasource.url = jdbc:mysql://localhost:3306/test
spring.datasource.username = root
spring.datasource.password = root
spring.datasource.driverClassName = com.mysql.jdbc.Driver
spring.datasource.max-active=20
spring.datasource.max-idle=8
spring.datasource.min-idle=8
spring.datasource.initial-size=10

编写Demo测试类

public class Demo {
private long id;
private String name;
//省略getter and setter….
}

编写DemoMapper

public interface DemoMappper {

@Select("select *from Demo where name = #{name}")
public List<Demo> likeName(String name);

@Select("select *from Demo where id = #{id}")
public Demo getById(long id);

@Select("select name from Demo where id = #{id}")
public String getNameById(long id);
}

编写DemoService

@Service
public class DemoService {
@Autowired
private DemoMappper demoMappper;

public List<Demo> likeName(String name){
return demoMappper.likeName(name);
}
}

编写DemoController

@RestController
public class DemoController {
@Autowired
private DemoService demoService;

@RequestMapping("/likeName")
public List<Demo> likeName(String name){
return demoService.likeName(name);
}

}

加入PageHelper

@Configuration
public class MyBatisConfiguration {

@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;
}
}

加入PageHelper

@RequestMapping("/likeName")
public List<Demo> likeName(String name){
PageHelper.startPage(1,1);
return demoService.likeName(name);
}

获取自增长ID

@Insert("insert into Demo(name,password) values(#{name},#{password})")
public long save(Demo name);

@Options(useGeneratedKeys = true, keyProperty = "id", keyColumn = "id")