Spring Boot + Mybatis + vue2 — 实现分页查询

后端

pom.xml文件导入依赖

<!--分页查询-->
<dependency>
   <groupId>com.github.pagehelper</groupId>
   <artifactId>pagehelper-spring-boot-starter</artifactId>
   <version>1.4.6</version>
</dependency>

配置全局配置文件application.properties

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

Student.java 学生实体类，里面的属性对应student表中的字段

@Data作用：实现Getter和Setter方法

@AllArgsConstructor作用：实现全参构造方法

@NoArgsConstructor作用：实现空参构造方法

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Student{
    /** 所属学院 */
    private String school;
    /** 所属专业 */
    private String major;
    /** 所属班级 */
    private String className;
    /** 学生姓名 */
    private String studentName;
}

@Data注解的使用需要导入Lombok依赖

<!--lombok-->
<dependency>
   <groupId>org.projectlombok</groupId>
   <artifactId>lombok</artifactId>
   <optional>true</optional>
 </dependency>

Params.java 模糊搜索包含的参数，该实体无对应的表字段

@Data
public class ScoreParams {
    /** 所属学院 */
    private String school;
    /** 所属专业 */
    private String major;
    /** 所属班级 */
    private String className;
    /** 学生学号 */
    private String studentNumber;
    /** 学生姓名 */
    private String studentName;
    /** 分页大小 */
    private Integer pageSize;
    /** 分页数 */
    private Integer pageNum;
}

StudentMapper.java

注：@Param("params") Params params命名一定要对应前端传来的参数?params: this.Params 保持一致

 List<Student> findBySearchValue(@Param("params") Params params);

StudentMapper.xml

<select id="findBySearchValue" resultType="com.domain.Student">
  SELECT * FROM student
  <where>
     <if test="params != null and params.school != null and params.school != '' ">
         AND school like concat('%', #{params.school}, '%')
     </if>
     <if test="params != null and params.major != null and params.major != '' ">
         AND major like concat('%', #{params.major}, '%')
     </if>
     <if test="params != null and params.className != null and params.className != '' ">
         AND class_name like concat('%', #{params.className}, '%')
     </if>
         AND student_number like concat('%', #{params.studentNumber}, '%')
     </if>
     <if test="params != null and params.studentName != null and params.studentName != '' ">
         AND student_name like concat('%', #{params.studentName}, '%')
     </if>
   </where>
</select>

StudentService.java

 PageInfo<Student> findBySearchValue(Params params);

StudentServiceImpl.java

 @Override
 public PageInfo<Student> findBySearchValue(Params params) {
        /** 分页查询 */
        PageHelper.startPage(params.getPageNum(),params.getPageSize());
        List<Score> bySearchValue = studentMapper.findBySearchValue(params);
        return PageInfo.of(bySearchValue);
  }

StudentController.java

@GetMapping("/search")
    public AjaxResult findBySearchValue(Params params){
        PageInfo<Student> findBySearchValue = studentService.findBySearchValue(params);
        return AjaxResult.success(findBySearchValue);
    }

前端

我使用的是ElementUI，进入官网:https://element.eleme.cn/2.0/#/zh-CN/component/pagination，任意选择一个分页的样式

SelectStudent.vue

<template>
  <div>
   <div>
      <el-table :data="Table" height="380" border style="width: 100%;">
        <el-table-column prop="school" label="学院" align="center" width="140"> </el-table-column>
        <el-table-column prop="major" label="专业" align="center" width="120"> </el-table-column>
        <el-table-column prop="className" label="班级" align="center" width="120"> </el-table-column>
        <el-table-column prop="studentName" label="姓名" align="center" width="100"> </el-table-column>
        <el-table-column label="操作" width="250" align="center">
          <el-button type="success" icon="el-icon-view" />
          <el-button type="primary" icon="el-icon-edit" />
          <el-button type="danger" icon="el-icon-delete" />
        </el-table-column>
      </el-table>
    </div>
   <!-- 分页查询 -->
   <div class="block" style="margin-left: 600px;margin-top: 20px;">
      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="Params.pageNum"
        :page-size="Params.pageSize"
        :page-sizes="[10, 20, 30, 40]"
        layout="total, sizes, prev, pager, next"
        :total="total">
      </el-pagination>
   </div>
 </div>
</template>

SelectStudent.vue

export default {
  name: "ScoreSelct",
  data() {
    return {
      total: 0,
      // 搜索框参数
      Params:{
        school: '',
        major: '',
        className: '',
        studentName: '',
        pageNum: 1,
        pageSize: 10,
      },
      // 查询表格
      scoreTable: [],
    }
  },
  // 页面加载时调用
  created(){
    this.findBySearchValue()
  },
  methods:{
    // 模糊搜索
    findBySearchValue(){
      request.get('/search',{params: this.Params}).then(res => {
        if(res.code === '200'){
          this.Table = res.data.list
          this.total = res.data.total
          this.$message.success('查询成功')
        }else{
          this.$message.error('查询失败')
        }
      })
    },
    // 清空输入框内容
    reset(){
      this.Params={
        school: '',
        major: '',
        className: '',
        studentName: '',
      },
      this.findBySearchValue()
    },
    // 点击查询时，触发10条/页
    handleSizeChange(pageSize){
      this.searchParams.pageSize = pageSize;
      this.findBySearchValue();
    },
    // 点击1，2，3页数切换
    handleCurrentChange(pageNum){
      this.searchParams.pageNum = pageNum;
      this.findBySearchValue();
    },
  }
}
</script>

res.data.list:具体需要看数据所在的位置，这里的数据是位于data下的list数组内