第八节：SpringBoot集成MyBatis

pom.xml

<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.1</version>
</dependency>

User实体类

package com.xiaowen.model;
public class User {

private Integer id;
private String name;
private Integer age;

public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
@Override
public String toString() {
return "User [id=" + id + ", name=" + name + ", age=" + age + "]";
}
}

UserMapper

package com.xiaowen.mapper;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;
import com.xiaowen.model.User;
@Mapper
public interface UserMaper {

@Select("select * from t_user where age = #{age}")
User Select(int age);
}

Controller

package com.xiaowen.controller;

import com.xiaowen.mapper.UserMaper;
import com.xiaowen.model.User;

@RestController
public class WebController {

@Autowired
private UserMaper userMaper;

@RequestMapping("/user")
public User selectAge(int age){
return userMaper.Select(age);
}

}

启动类

package com.xiaowen;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class SpringBootDemoApplication {

public static void main(String[] args) {
SpringApplication.run(SpringBootDemoApplication.class, args);
}
}

浏览器访问：http://localhost:8088/user?age=10



 Mybatis使用分页插件PageHelper

pom.xml配置

<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper</artifactId>
<version>4.1.0</version>
</dependency>

package com.xiaowen.util;

import java.util.Properties;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import com.github.pagehelper.PageHelper;

/**
* 注册MyBatis分页插件PageHelper
* @author xiaowen
*
*/
@Configuration
public class MybatisConf {
@Bean
public PageHelper 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;
}
}

Controller

@RequestMapping("/user")
public User selectAge(int age){
//第一个参数是第几页；第二个参数是每页显示条数。
PageHelper.startPage(1, 2);
return userMaper.Select(age);
}