分页和条件查询及显示

1、写一个配置类，配置分页插件

@Configuration
@MapperScan("com.atguigu.eduservice.mapper")   //路径为mapper文件所在的包
public class EduConfig {
    /**
     * 分页插件
     */
    @Bean
    public PaginationInterceptor paginationInterceptor() {
        return new PaginationInterceptor();
    }
}

2、编写分页方法

一：不带条件

    @Autowired
    private EduTeacherService eduTeacherService;


    //分页查询讲师的方法
    @GetMapping("/pageTeacher/{current}/{limit}")
    public R pageListTeacher(@PathVariable long current,
                             @PathVariable long limit) {
        Page<EduTeacher> pageTeacher = new Page<>(current, limit);
        //调用方法实现分页
        eduTeacherService.page(pageTeacher, null);
        long total = pageTeacher.getTotal();//总记录数
        List<EduTeacher> records = pageTeacher.getRecords();
        return R.ok().data("total", total).data("row", records);
    }

   

带条件：（建议建一个条件的实体类）

@ApiModel(value = "Teacher查询对象", description = "讲师查询对象封装")
@Data
public class TeacherQuery {
    private static final long serialVersionUID = 1L;

    @ApiModelProperty(value = "教师名称,模糊查询")
    private String name;

    @ApiModelProperty(value = "头衔 1高级讲师 2首席讲师")
    private Integer level;

    @ApiModelProperty(value = "查询开始时间", example = "2019-01-01 10:10:10")
    private String begin;//注意，这里使用的是String类型，前端传过来的数据无需进行类型转换

    @ApiModelProperty(value = "查询结束时间", example = "2019-12-01 10:10:10")
    private String end;
}

    //条件查询带分页方法
    @PostMapping("/pageTeacherCondition/{current}/{limit}")
    public R pageTeacherCondition(@PathVariable long current, @PathVariable long limit,
                                  @RequestBody(required = false) TeacherQuery teacherQuery) {

        //创建page对象
        Page<EduTeacher> pageTeacher = new Page<>(current, limit);

        //构建条件
        QueryWrapper<EduTeacher> wrapper = new QueryWrapper<>();
        // 多条件组合查询
        // mybatis学过 动态sql
        String name = teacherQuery.getName();
        Integer level = teacherQuery.getLevel();
        String begin = teacherQuery.getBegin();
        String end = teacherQuery.getEnd();
        //判断条件值是否为空，如果不为空拼接条件
        if (!StringUtils.isEmpty(name)) {
            //构建条件
            wrapper.like("name", name);
        }
        if (!StringUtils.isEmpty(level)) {
            wrapper.eq("level", level);
        }
        if (!StringUtils.isEmpty(begin)) {
            wrapper.ge("gmt_create", begin);
        }
        if (!StringUtils.isEmpty(end)) {
            wrapper.le("gmt_create", end);
        }

        //排序
        wrapper.orderByDesc("gmt_create");

        //调用方法实现条件查询分页
        eduTeacherService.page(pageTeacher, wrapper);

        long total = pageTeacher.getTotal();//总记录数
        List<EduTeacher> records = pageTeacher.getRecords(); //数据list集合
        return R.ok().data("total", total).data("rows", records);
    }

前端显示：

我使用的是饿了么的element-ui组件，详细使用到官网https://element.eleme.cn/#/zh-CN/component/installation

<template>
  <div class="app-container">
    讲师表单

    <!--查询表单-->
    <el-form :inline="true" class="demo-form-inline">
      <el-form-item>
        <el-input v-model="teacherQuery.name" placeholder="讲师名"/>
      </el-form-item>

      <el-form-item>
        <el-select v-model="teacherQuery.level" clearable placeholder="讲师头衔">
          <el-option :value="1" label="高级讲师"/>
          <el-option :value="2" label="首席讲师"/>
        </el-select>
      </el-form-item>

      <el-form-item label="添加时间">
        <el-date-picker
          v-model="teacherQuery.begin"
          type="datetime"
          placeholder="选择开始时间"
          value-format="yyyy-MM-dd HH:mm:ss"
          default-time="00:00:00"
        />
      </el-form-item>
      <el-form-item>
        <el-date-picker
          v-model="teacherQuery.end"
          type="datetime"
          placeholder="选择截止时间"
          value-format="yyyy-MM-dd HH:mm:ss"
          default-time="00:00:00"
        />
      </el-form-item>

      <el-button type="primary" icon="el-icon-search" @click="getList()">查询</el-button>
      <el-button type="default" @click="resetData()">清空</el-button>
    </el-form>

        <!-- 表格 -->
    <el-table
      
      :data="list"
      element-loading-text="数据加载中"
      border
      fit
      highlight-current-row>

      <el-table-column
        label="序号"
        width="70"
        align="center">
        <template slot-scope="scope">
          {{ (page - 1) * limit + scope.$index + 1 }}
        </template>
      </el-table-column>

      <el-table-column prop="name" label="名称" width="80" />

      <el-table-column label="头衔" width="80">
        <template slot-scope="scope">
          {{ scope.row.level===1?'高级讲师':'首席讲师' }}
        </template>
      </el-table-column>

      <el-table-column prop="intro" label="资历" />

      <el-table-column prop="gmtCreate" label="添加时间" width="160"/>

      <el-table-column prop="sort" label="排序" width="60" />

      <el-table-column label="操作" width="200" align="center">
        <template slot-scope="scope">
          <router-link :to="'/teacher/edit/'+scope.row.id">
            <el-button type="primary" size="mini" icon="el-icon-edit">修改</el-button>
          </router-link>
          <el-button type="danger" size="mini" icon="el-icon-delete" @click="removeDataById(scope.row.id)">删除</el-button>
        </template>
      </el-table-column>
    </el-table>

       <!-- 分页 -->
    <el-pagination
      :current-page="page"
      :page-size="limit"
      :total="total"
      style="padding: 30px 0; text-align: center;"
      layout="total, prev, pager, next, jumper"
      @current-change="getList"
    />
  </div>
</template>

<script>
//引入调用teacher.js文件
import teacher from '@/api/edu/teacher'

export default {
    //写核心代码位置
    // data:{

    // },
    data() {//定义变量和初始值
        return {
          list:null,//查询之后接口返回集合
          page:1,//当前页
          limit:3,//每页记录数
          total:0,//总记录数
          teacherQuery:{} //条件封装对象
        }
    },
    created() {
        this.getList()
    },
    methods: {
        getList(page = 1){
            this.page = page
            teacher.getTeacherListPage(this.page,this.limit,this.teacherQuery)
            .then(response =>{
                //console.log(response)
                this.list = response.data.rows
                this.total = response.data.total
                // console.log(this.list)
                // console.log(this.total)
            })
            .catch(error =>{
                console.log(error)
            })
        
        },
        resetData(){ 
            //清空条件
            this.teacherQuery={}

            //查询所有
            this.getList()
        },
        //删除讲师方法
        removeDataById(id){
            this.$confirm('此操作将永久删除讲师记录, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).then(() => {  //点击确定，执行then方法
                //调用删除的方法
                teacher.deleteTeacherId(id)
                    .then(response =>{//删除成功
                    //提示信息
                    this.$message({
                        type: 'success',
                        message: '删除成功!'
                    });
                    //回到列表页面
                    this.getList()
                })
            }) 
        }
    },
}
</script>