mybatis-plus分页查询数据库数据

1 在springboot中整合mybatis-plus

<!-- 引入mybatisPlus -->
     　　<dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.2.0</version>
        </dependency>
        <!-- 引入mysql驱动包 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.27</version>
        </dependency>
        <!-- 引入Druid依赖，阿里巴巴所提供的数据源 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.0.29</version>
　　　　</dependency>

2 在application.yml配置

spring:
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=UTF-8
    username: root
    password: 123456

3 在启动类上面添加@MapperScan注解，扫描mapper包

@MapperScan("com.atguigu.admin.mapper")

4 新建User和UserMapper

import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@AllArgsConstructor
@NoArgsConstructor
@Data
@TableName("user")
public class User {
    //非数据库中的数据
    @TableField(exist = false)
    private String userName;
    @TableField(exist = false)
    private String password;
    
    //数据库中的数据
    private int id;
    private String name;
    private String age;
    private String email;
}

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.fxz.admin.bean.User;
import org.apache.ibatis.annotations.Mapper;

@Mapper
public interface UserMapper extends BaseMapper<User> { //mapper继承父类获取操作方法 泛型为数据库数据对应的类 无需配置xml映射文件
}

5  Service

import com.baomidou.mybatisplus.extension.service.IService;
import com.fxz.admin.bean.User;

public interface UserService extends IService<User> {
}

//继承父类 泛型为对应mapper和操作对象
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper,User> implements UserService {
}

6 分页查询拦截器

@Configuration
public class MybatisConfig { //mybatis分页查询必须配置分页拦截器

     @Bean
     public PaginationInterceptor paginationInterceptor() {
        PaginationInterceptor paginationInterceptor = new PaginationInterceptor();
        return paginationInterceptor;
     }
}

7 前端控制器 Controller

 @GetMapping(value = "/dynamic_table") //拦截请求
    public String dynamic(Model model,@RequestParam(value = "pn",defaultValue = "1")int pn){
        //分页参数
        Page<User> page = new Page(pn,2);
        //调用page分页
        Page<User> users = userService.page(page);
        model.addAttribute("users",users);
        return "table/dynamic_table";
    }

8 前端页面展示数据

<tr class="gradeX" th:each="user: ${users.records}"> <!--这里按照取得的记录数遍历-->
            <td th:text="${user.id}"></td>
            <td th:text="${user.name}"></td>
            <td th:text="${user.age}"></td>
            <td th:text="${user.email}"></td>
 </tr>

</div>
            <div class="row-fluid">
                <div class="span6">
                    <div class="dataTables_info" id="dynamic-table_info">  <!--分页栏 获取数据-->
                        当前第[[${users.current}]]页  总计 [[${users.pages}]]页  共[[${users.total}]]条记录 
                    </div>
                </div>
                <div class="span6">
                    <div class="dataTables_paginate paging_bootstrap pagination">
                        <ul>   
                            <li class="prev disabled"><a href="#">← 前一页</a></li>           <!---生成数字序列-->
                            <li th:class="${num == users.current?'active':''}" th:each="num:${#numbers.sequence(1,users.pages)}" >
                                <a th:href="@{/dynamic_table(pn=${num})}">[[${num}]]</a>
                            </li>
                            <li class="next disabled"><a href="#">下一页 → </a></li>
                        </ul>
                    </div>
                </div>
            </div> </div>