SpringBoot整合Mybatis分页插件

添加pom.xml

<dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper-spring-boot-starter</artifactId>
            <version>1.2.5</version>
        </dependency>

        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.2</version>
        </dependency>
        <!-- MYSQL包 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

配置application.properties

spring.datasource.url=jdbc:mysql://localhost:3306/springboot-learning
spring.datasource.password=root
spring.datasource.username=root

# 驼峰命名规范 如：数据库字段是  order_id 那么 实体字段就要写成 orderId
mybatis.configuration.map-underscore-to-camel-case=true
#配置mybatis xml配置文件
mybatis.mapper-locations=classpath:mapper/*.xml
# 设置打印mybatis SQL语句
logging.level.com.lzc.mybatis.mapper=debug


########## 分页插件 ##########
pagehelper.helper-dialect=mysql
pagehelper.params=count=countSql
pagehelper.reasonable=false
pagehelper.support-methods-arguments=true

新建一张user表

CREATE TABLE `user` (
  `user_id` int(8) NOT NULL AUTO_INCREMENT COMMENT '主键自增',
  `name` varchar(50) NOT NULL COMMENT '用户名',
  `password` varchar(50) NOT NULL COMMENT '密码',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='用户表';

User实体类

package com.lzc.mybatis.dataobject;
 
public class User {
 
    private Integer userId;
 
    private String name;
 
    private String password;
 
    public User() {
    }
 
    public User(String name, String password) {
        this.name = name;
        this.password = password;
    }
 
    public User(Integer userId, String name, String password) {
        this.userId = userId;
        this.name = name;
        this.password = password;
    }
 
    // 省略get、set方法
 
}

新建UserMapper.java

package com.lzc.mybatis.mapper;
 
import com.lzc.mybatis.dataobject.User;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Options;
import org.apache.ibatis.annotations.Select;
 
import java.util.List;
 
@Mapper
public interface UserMapper{
 
    @Select("select * from user")
    List<User> getAll();
 
}

编写测试类

@RunWith(SpringRunner.class)
@SpringBootTest
public class UserMapperTest {

    @Autowired
    private UserMapper userMapper;


    @Test
    public void getAll() {
        List<User> users = new ArrayList<>();
        PageHelper.startPage(2, 4).setOrderBy("user_id desc");
        PageInfo<User> userPageInfo = new PageInfo<>(userMapper.getAll());
        System.out.println(userPageInfo);
    }
}