SpringBoot+MyBatis+Mybatis分页插件PageHelper实现分页查询

1.引入依赖

SpringBoot整合Mybatis分页插件PageHelper是很方便的:
只需要在pom.xml文件中引入pagehelper依赖包就可以了

<!-- 引入Mybatis 分页插件pageHelper -->
   	<dependency>
           <groupId>com.github.pagehelper</groupId>
           <artifactId>pagehelper-spring-boot-starter</artifactId>
           <version>1.2.3</version>
       </dependency>

引入后down下来的依赖的jar包：

2.分页实现

在前一篇SpingBoot整合Mybatis开发的Demo的基础上实现一个分页功能：
根据 编码+名称 查询客户信息 查询结果以列表形式展示并支持分页
CustomerController.java中代码：

/**
    * 功能描述：根据 编码+名称查询客户信息   查询结果以列表形式展示并支持分页
    * postman接口测试：
    * http://localhost:8080/api/selectCustomerListByCodeAndName?name=张三&code=zhangsan
    * @param code
    * @param name
    * @param pageSize
    * @param pageNum
    * @return
    */
   @RequestMapping(value="/api/selectCustomerListByCodeAndName")
   public Object selectCustomerListByCodeAndName(@RequestParam(value="pageNum",defaultValue="1") int pageNum,
   		                                      @RequestParam(value="pageSize",defaultValue="5") int pageSize,
   		                                      String code,
   		                                      String name){
   	PageInfo<Customer> pageInfo = customerService.selectCustomerListByCodeAndName(pageNum,pageSize,code,name);
   	
   	return pageInfo;
   }

CustomerService.java中代码：

/**
   * 功能描述：根据 编码+名称查询客户信息   查询结果以列表形式展示并支持分页
   * @param pageSize
   * @param pageNum
   * @param code
   * @param name
   * @return
   */
  public PageInfo<Customer> selectCustomerListByCodeAndName(int pageNum, int pageSize, String code, String name);

CustomerServiceImpl.java中代码：
分页的处理是注解第3步来完成的，不是mapper.xml中实现的

/**
  * 功能描述：根据 编码+名称查询客户信息   查询结果以列表形式展示并支持分页
  */
 @Override
 public PageInfo<Customer> selectCustomerListByCodeAndName(int pageNum, int pageSize, String code, String name) {
 	
 	//1.startPage--start,设置当前页和每页显示条数
 	PageHelper.startPage(pageNum,pageSize);
 	//2.填充自己的sql查询逻辑
 	List<Customer> customerList = customerMapper.selectCustomerListByCodeAndName(code, name);
 	//3.pageHelper收尾，将返回结果信息进行分页处理
 	PageInfo<Customer> pageResult = new PageInfo<Customer>(customerList);
 	return pageResult;
 }

CustomerMapper.java中代码：

/**
   * 功能描述：根据 编码+名称查询客户信息   查询结果以列表形式展示并支持分页
   * @param name 
   * @param code 
   * @return
   */
  public List<Customer> selectCustomerListByCodeAndName(@Param(value="code") String code, @Param(value="name")String name);

customer.xml中增加的代码：

<resultMap id="BaseResultMap" type="com.springboot20.xdclass.springboot.demo2.domain.Customer">
    <id column="id" property="id" />
    <result column="code" property="code" />
    <result column="name" property="name" />
    <result column="reg_time" property="regTime" />
    <result column="update_time" property="updateTime" />
</resultMap> 


<select id="selectCustomerListByCodeAndName" resultMap="BaseResultMap">
   select * from t_customer
  <where>
      <if test="code != null and code != ''">
      and code like concat(concat('%'),#{code},'%')
      </if>
      <if test="name != null and name != ''">
      and name like concat(concat('%'),#{name},'%')
      </if>
  </where>
  order by id asc
</select>

3.postman接口测试：

返回结果：

{
    "pageNum": 1,
    "pageSize": 5,
    "size": 5,
    "startRow": 1,
    "endRow": 5,
    "total": 9,
    "pages": 2,
    "list": [
        {
            "id": 1,
            "code": "zhangsan",
            "name": "张三",
            "regTime": "2019-08-13T05:15:04.000+0000",
            "updateTime": "2019-08-13T05:15:04.000+0000"
        },
        {
            "id": 2,
            "code": "zhangsan",
            "name": "张三",
            "regTime": "2019-08-13T05:15:21.000+0000",
            "updateTime": "2019-08-13T05:15:21.000+0000"
        },
        {
            "id": 3,
            "code": "zhangsan",
            "name": "张三",
            "regTime": "2019-08-13T05:15:22.000+0000",
            "updateTime": "2019-08-13T05:15:22.000+0000"
        },
        {
            "id": 4,
            "code": "zhangsan",
            "name": "张三",
            "regTime": "2019-08-13T05:15:23.000+0000",
            "updateTime": "2019-08-13T05:15:23.000+0000"
        },
        {
            "id": 5,
            "code": "zhangsan",
            "name": "张三",
            "regTime": "2019-08-13T05:15:24.000+0000",
            "updateTime": "2019-08-13T05:15:24.000+0000"
        }
    ],
    "prePage": 0,
    "nextPage": 2,
    "isFirstPage": true,
    "isLastPage": false,
    "hasPreviousPage": false,
    "hasNextPage": true,
    "navigatePages": 8,
    "navigatepageNums": [
        1,
        2
    ],
    "navigateFirstPage": 1,
    "navigateLastPage": 2,
    "firstPage": 1,
    "lastPage": 2
}