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Spring Boot+Mybatis+Pagehelper分页【转载】

Java 姚, 伟 390浏览 0评论

pom配置

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.xiaolyuh</groupId>
    <artifactId>spring-boot-student-mybatis</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>
    <name>spring-boot-student-mybatis</name>

    <!-- 添加Spring Boot的父类依赖,这样当前项目就是Spring Boot项目了。 spring-boot-starter-parent是一个特殊的starter,他用来
        提供相关的maven默认依赖, 使用它之后,常用的依赖可以省去version标签 -->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.0</version>
        </dependency>
        <!--pagehelper -->
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper-spring-boot-starter</artifactId>
            <version>1.1.1</version>
        </dependency>

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.31</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

application.properties配置

server.port=80
# 数据源配置
spring.datasource.url=jdbc:mysql://localhost:3306/ssb_test
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.username=root
spring.datasource.password=root
#连接池配置
#spring.datasource.type=org.apache.commons.dbcp2.BasicDataSource

#mybatis
#entity扫描的包名
mybatis.type-aliases-package=com.xiaolyuh.domain.model
#Mapper.xml所在的位置
mybatis.mapper-locations=classpath*:/mybaits/*Mapper.xml

#pagehelper分页插件配置
pagehelper.helperDialect=mysql
pagehelper.reasonable=true
pagehelper.supportMethodsArguments=true
pagehelper.params=count=countSql

#日志配置
logging.level.com.xiaolyuh=debug
logging.level.org.springframework.web=debug
logging.level.org.springframework.transaction=debug
logging.level.org.mybatis=debug

debug=false

除了上面常见的两项配置,还有:

mybatis.config-location=mybatis-config.xml配置文件的路径
mybatis.type-handlers-package=扫描typeHandlers的包
mybatis.check-config-location=检查配置文件是否存在
mybatis.executor-type=设置执行模式(SIMPLE, REUSE, BATCH),默认为SIMPLE

Mapping XML文件

在resources文件夹下创建mybaits/PersonMapper.xml文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.xiaolyuh.domain.mapper.PersonMapper" >
  <resultMap id="BaseResultMap" type="com.xiaolyuh.domain.model.Person" >
    <!--
      WARNING - @mbggenerated
      This element is automatically generated by MyBatis Generator, do not modify.
    -->
    <id column="id" property="id" jdbcType="BIGINT" />
    <result column="name" property="name" jdbcType="VARCHAR" />
    <result column="age" property="age" jdbcType="INTEGER" />
    <result column="address" property="address" jdbcType="VARCHAR" />
  </resultMap>
  <sql id="Base_Column_List" >
    <!--
      WARNING - @mbggenerated
      This element is automatically generated by MyBatis Generator, do not modify.
    -->
    id, name, age, address
  </sql>
  <select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Long" >
    <!--
      WARNING - @mbggenerated
      This element is automatically generated by MyBatis Generator, do not modify.
    -->
    select 
    <include refid="Base_Column_List" />
    from person
    where id = #{id,jdbcType=BIGINT}
  </select>
  <delete id="deleteByPrimaryKey" parameterType="java.lang.Long" >
    <!--
      WARNING - @mbggenerated
      This element is automatically generated by MyBatis Generator, do not modify.
    -->
    delete from person
    where id = #{id,jdbcType=BIGINT}
  </delete>
  <insert id="insert" parameterType="com.xiaolyuh.domain.model.Person" >
    <!--
      WARNING - @mbggenerated
      This element is automatically generated by MyBatis Generator, do not modify.
    -->
    <selectKey resultType="java.lang.Long" keyProperty="id" order="AFTER" >
      SELECT LAST_INSERT_ID()
    </selectKey>
    insert into person (name, age, address
      )
    values (#{name,jdbcType=VARCHAR}, #{age,jdbcType=INTEGER}, #{address,jdbcType=VARCHAR}
      )
  </insert>
  <insert id="insertSelective" parameterType="com.xiaolyuh.domain.model.Person" >
    <!--
      WARNING - @mbggenerated
      This element is automatically generated by MyBatis Generator, do not modify.
    -->
    <selectKey resultType="java.lang.Long" keyProperty="id" order="AFTER" >
      SELECT LAST_INSERT_ID()
    </selectKey>
    insert into person
    <trim prefix="(" suffix=")" suffixOverrides="," >
      <if test="name != null" >
        name,
      </if>
      <if test="age != null" >
        age,
      </if>
      <if test="address != null" >
        address,
      </if>
    </trim>
    <trim prefix="values (" suffix=")" suffixOverrides="," >
      <if test="name != null" >
        #{name,jdbcType=VARCHAR},
      </if>
      <if test="age != null" >
        #{age,jdbcType=INTEGER},
      </if>
      <if test="address != null" >
        #{address,jdbcType=VARCHAR},
      </if>
    </trim>
  </insert>
  <update id="updateByPrimaryKeySelective" parameterType="com.xiaolyuh.domain.model.Person" >
    <!--
      WARNING - @mbggenerated
      This element is automatically generated by MyBatis Generator, do not modify.
    -->
    update person
    <set >
      <if test="name != null" >
        name = #{name,jdbcType=VARCHAR},
      </if>
      <if test="age != null" >
        age = #{age,jdbcType=INTEGER},
      </if>
      <if test="address != null" >
        address = #{address,jdbcType=VARCHAR},
      </if>
    </set>
    where id = #{id,jdbcType=BIGINT}
  </update>
  <update id="updateByPrimaryKey" parameterType="com.xiaolyuh.domain.model.Person" >
    <!--
      WARNING - @mbggenerated
      This element is automatically generated by MyBatis Generator, do not modify.
    -->
    update person
    set name = #{name,jdbcType=VARCHAR},
      age = #{age,jdbcType=INTEGER},
      address = #{address,jdbcType=VARCHAR}
    where id = #{id,jdbcType=BIGINT}
  </update>

  <select id="findAll" resultMap="BaseResultMap">
    select
    <include refid="Base_Column_List" />
    from person
  </select>

  <select id="findByPage" resultMap="BaseResultMap">
    select
    <include refid="Base_Column_List" />
    from person
  </select>
</mapper>

DAO层Mapper类

在Mapper接口上需要加上@Mapper注解,@Mapper注解声明成mybatis Dao层的Bean。也可以在配置类上使用@MapperScan(“com.xiaolyuh.domain.mapper”)注解声明。

package com.xiaolyuh.domain.mapper;

import com.github.pagehelper.Page;
import com.xiaolyuh.domain.model.Person;
import org.apache.ibatis.annotations.Mapper;

import java.util.List;

@Mapper//声明成mybatis Dao层的Bean,也可以在配置类上使用@MapperScan("com.xiaolyuh.domain.mapper")注解声明
public interface PersonMapper {

    int deleteByPrimaryKey(Long id);

    int insert(Person record);

    int insertSelective(Person record);

    Person selectByPrimaryKey(Long id);

    int updateByPrimaryKeySelective(Person record);

    int updateByPrimaryKey(Person record);

    /**
     * 获取所有数据
     * @return
     */
    List<Person> findAll();

    /**
     * 分页查询数据
     * @return
     */
    Page<Person> findByPage();
}

实体类

package com.xiaolyuh.domain.model;

public class Person {

    private Long id;

    /**
     * 名称
     */
    private String name;

    /**
     * 年龄
     */
    private Integer age;

    /**
     * 地址
     */
    private String address;

    public Long getId() {
        return id;
    }

    public void setId(Long 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;
    }

    public String getAddress() {
        return address;
    }

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

Service层

接口

package com.xiaolyuh.service;

import com.github.pagehelper.Page;
import com.xiaolyuh.domain.model.Person;

import java.util.List;

/**
 * Created by yuhao.wang on 2017/6/19.
 */
public interface PersonService {

    List<Person> findAll();

    /**
     * 分页查询
     * @param pageNo 页号
     * @param pageSize 每页显示记录数
     * @return
     */
    Page<Person> findByPage(int pageNo, int pageSize);

    void insert(Person person);
}

实现类

package com.xiaolyuh.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.xiaolyuh.domain.mapper.PersonMapper;
import com.xiaolyuh.domain.model.Person;
import com.xiaolyuh.service.PersonService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

/**
 * Created by yuhao.wang on 2017/6/19.
 */
@Service
@Transactional(readOnly = true)
public class PersonServiceImpl implements PersonService {

    @Autowired
    private PersonMapper personMapper;

    @Override
    public List<Person> findAll() {
        return personMapper.findAll();
    }

    @Override
    public Page<Person> findByPage(int pageNo, int pageSize) {
        PageHelper.startPage(pageNo, pageSize);
        return personMapper.findByPage();
    }

    @Override
    @Transactional
    public void insert(Person person) {
        personMapper.insert(person);
    }

}

分页的包装类PageInfo

需要把Page包装成PageInfo对象才能序列化。该插件也默认实现了一个PageInfo

package com.xiaolyuh.page;

import java.io.Serializable;
import java.util.Collection;
import java.util.List;

import com.github.pagehelper.Page;

/**
 * 对Page<E>结果进行包装
 * <p/>
 * 新增分页的多项属性,主要参考:http://bbs.csdn.net/topics/360010907
 *
 * @author liuzh/abel533/isea533
 * @version 3.3.0
 * @since 3.2.2
 * 项目地址 : http://git.oschina.net/free/Mybatis_PageHelper
 */
@SuppressWarnings({"rawtypes", "unchecked"})
public class PageInfo<T> implements Serializable {
    private static final long serialVersionUID = 1L;
    //当前页
    private int pageNum;
    //每页的数量
    private int pageSize;
    //总记录数
    private long total;
    //总页数
    private int pages;
    //结果集
    private List<T> list;
    //是否为第一页
    private boolean isFirstPage = false;
    //是否为最后一页
    private boolean isLastPage = false;


    public PageInfo() {
    }

    /**
     * 包装Page对象
     *
     * @param list
     */
    public PageInfo(List<T> list) {
        if (list instanceof Page) {
            Page page = (Page) list;
            this.pageNum = page.getPageNum();
            this.pageSize = page.getPageSize();

            this.pages = page.getPages();
            this.list = page;
            this.total = page.getTotal();
        } else if (list instanceof Collection) {
            this.pageNum = 1;
            this.pageSize = list.size();

            this.pages = 1;
            this.list = list;
            this.total = list.size();
        }
        if (list instanceof Collection) {
            //判断页面边界
            judgePageBoudary();
        }
    }

    /**
     * 判定页面边界
     */
    private void judgePageBoudary() {
        isFirstPage = pageNum == 1;
        isLastPage = pageNum == pages;
    }

    public int getPageNum() {
        return pageNum;
    }

    public void setPageNum(int pageNum) {
        this.pageNum = pageNum;
    }

    public int getPageSize() {
        return pageSize;
    }

    public void setPageSize(int pageSize) {
        this.pageSize = pageSize;
    }

    public long getTotal() {
        return total;
    }

    public void setTotal(long total) {
        this.total = total;
    }

    public int getPages() {
        return pages;
    }

    public void setPages(int pages) {
        this.pages = pages;
    }

    public List<T> getList() {
        return list;
    }

    public void setList(List<T> list) {
        this.list = list;
    }

    public boolean isIsFirstPage() {
        return isFirstPage;
    }

    public void setIsFirstPage(boolean isFirstPage) {
        this.isFirstPage = isFirstPage;
    }

    public boolean isIsLastPage() {
        return isLastPage;
    }

    public void setIsLastPage(boolean isLastPage) {
        this.isLastPage = isLastPage;
    }

    @Override
    public String toString() {
        final StringBuffer sb = new StringBuffer("PageInfo{");
        sb.append("pageNum=").append(pageNum);
        sb.append(", pageSize=").append(pageSize);
        sb.append(", total=").append(total);
        sb.append(", pages=").append(pages);
        sb.append(", list=").append(list);
        sb.append(", isFirstPage=").append(isFirstPage);
        sb.append(", isLastPage=").append(isLastPage);
        sb.append(", navigatepageNums=");
        sb.append('}');
        return sb.toString();
    }
}

测试类

package com.xiaolyuh;

import com.github.pagehelper.Page;
import com.xiaolyuh.domain.model.Person;
import com.xiaolyuh.page.PageInfo;
import com.xiaolyuh.service.PersonService;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import com.alibaba.fastjson.JSON;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import java.util.List;

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

	private Logger logger = LoggerFactory.getLogger(PersonMapperTests.class);

	@Autowired
	private PersonService personService;

	@Before
	public void testInsert() {
		Person person = new Person();
		person.setName("测试");
		person.setAddress("address");
		person.setAge(10);
		personService.insert(person);

		Assert.assertNotNull(person.getId());
		logger.debug(JSON.toJSONString(person));
	}

	@Test
	public void testFindAll() {
		List<Person> persons = personService.findAll();

		Assert.assertNotNull(persons);
		logger.debug(JSON.toJSONString(persons));
	}

	@Test
	public void testFindByPage() {
		Page<Person> persons = personService.findByPage(1, 2);
		// 需要把Page包装成PageInfo对象才能序列化。该插件也默认实现了一个PageInfo
		PageInfo<Person> pageInfo = new PageInfo<>(persons);
		Assert.assertNotNull(persons);
		logger.debug(pageInfo.toString());
		logger.debug(JSON.toJSONString(pageInfo));
	}

	@Test
	public void testCacheByPage() {
		long begin = System.currentTimeMillis();
		List<Person> persons = personService.findAll();
		long ing = System.currentTimeMillis();
		personService.findAll();
		long end = System.currentTimeMillis();
		logger.debug("第一次请求时间:" + (ing - begin) + "ms");
		logger.debug("第二次请求时间:" + (end - ing) + "ms");

		Assert.assertNotNull(persons);
		logger.debug(persons.toString());
		logger.debug(JSON.toJSONString(persons));
	}

}

源码:https://github.com/wyh-spring-ecosystem-student/spring-boot-student/tree/releases

文章出处:https://blog.csdn.net/xiaolyuh123/article/details/73506189

原作者:xiaolyuh123

转载时请注明出处及相应链接,本文永久地址:https://www.askaura.com/23789.html


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