Spring Boot整合MyBatis

MyBatis相信大家都很熟悉了，Spring Boot也对mybatis有很好的支持，在spring boot中使用mybatis比较简单，配置也比较少，非常的简洁明了，一起来看下吧

一  依赖的引入

<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>

<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.1</version>
</dependency>
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper</artifactId>
<version>4.1.0</version>
</dependency>

要注意的是分页插件的版本，版本不同使用起来也会有差异

二  配置文件

 

#DataBase DataSources
spring.datasource.url = jdbc:mysql://localhost:3306/springboot
spring.datasource.username = root
spring.datasource.password = 123456
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

logging.level.com.debug=debug

配置文件主要是数据库的连接配置，就不过多解释了

三   在App.java里加入映射器扫描注解@MapperScan

package com.debug;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

/**
* Hello world!
*
*/
@SpringBootApplication
@MapperScan("com.debug.dao") //dao包下面是接口也就是mybatis的Mapper
public class App
{
public static void main( String[] args )
{
System.out.println( "Hello World!" );
SpringApplication.run(App.class, args);
}
}

四   pojo和映射器

package com.debug.pojo;

public class UserInfo {

private int id;
private String name;
private String address;

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;
}

public String getAddress() {
return address;
}

public void setAddress(String address) {
this.address = address;
}

}

这里大家都懂的就不多说了

package com.debug.dao;

import org.apache.ibatis.annotations.Result;
import org.apache.ibatis.annotations.Results;
import org.apache.ibatis.annotations.Select;

import com.debug.pojo.UserInfo;

public interface UserMapper {

@Select("select * from user where id=#{id}")
@Results({
@Result(column="id",property="id"),
@Result(column="name",property="name"),
@Result(column="address",property="address")
})
public UserInfo getUserById(int id);

@Select("select * from user where name like #{name}")
@Results({
@Result(column="id",property="id"),
@Result(column="name",property="name"),
@Result(column="address",property="address")
})
public List<UserInfo> getUserByName(String name);

}


映射器把查询语句写成了注解，增删改查都有相应的注解可供使用，@Results和之前的resultMap比较类似，主要配置的是数据库字段和java属性的配置，因为数据库列名和属性不一定相同

五  service类和分页工具类

针对数据分页的这个常用功能。github上也提供了用于mybatis分页的插件，我们只需要把它配置成bean然后交给spring boot进行管理就可以在代码里引用了

package com.debug.config;

import java.util.Properties;

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

import com.github.pagehelper.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;
}
}


下面就是比较主要的service类了
package com.debug.service;

import javax.annotation.Resource;

import org.springframework.stereotype.Service;

import com.debug.dao.UserMapper;
import com.debug.pojo.UserInfo;

@Service
public class UserService {

@Resource
private UserMapper userMapper;

public UserInfo getUserById(int id) {
return userMapper.getUserById(id);
}

public List<UserInfo> getUserByName(String name) {

return userMapper.getUserByName(name);
}
}


这里只简单的写了2个方法，后面再controller将会使用到
package com.debug.controller;

import java.util.List;

import javax.annotation.Resource;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.debug.dao.UserMapper;
import com.debug.pojo.UserInfo;
import com.debug.service.UserService;
import com.github.pagehelper.PageHelper;

@RestController
@RequestMapping("/user")
public class UserController {
@Resource
private UserService userService;
@RequestMapping("/getUserById")
public UserInfo getUserById() {
return userService.getUserById(16);
}
@RequestMapping("/getUserByName")
public List<UserInfo> getUserByName() {
PageHelper.startPage(1,2);
return userService.getUserByName("%林%");
}
}


最后看下运行效果：



分页的运行效果如下：



数据库里的数据是这样的