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分頁查詢和模糊查詢前後端程式碼

前端程式碼

<template>
  <div class="home">
    <el-container style="height: 100%;">
      <!--左側邊欄-->
      <el-aside :width="sideWidth + 'px'" style="background-color: rgb(238, 241, 246);height: 100%; box-shadow:2px 0 6px rgb(0, 21, 41, 0.35)">
        <el-menu :default-openeds="['1', '3']" style="height: 100%;background-color: rgb(48, 65, 86);overflow-x: hidden"
                 default-active="2"
                 background-color="#304156FF"
                 text-color="#fff"
                 active-text-color="#ffd04b"
                 :collapse-transition="false"
                 :collapse="isCollapse"
                 class="el-menu-vertical-demo"
        >
          <div style="height: 60px;line-height: 60px;text-align: center">
            <img src="../assets/logo.png" alt="" style="width: 20px;position: relative;top: 5px;margin-right: 5px"></img>
            <b style="color: #fff" v-show="logoTextShow">後臺管理系統</b>
          </div>
          <el-submenu index="1">
            <template slot="title">
              <i class="el-icon-message"></i>
              <span slot="title">導航一</span>
            </template>
            <el-menu-item-group>
              <template slot="title">分組一</template>
              <el-menu-item index="1-1">選項1</el-menu-item>
              <el-menu-item index="1-2">選項2</el-menu-item>
            </el-menu-item-group>
            <el-menu-item-group title="分組2">
              <el-menu-item index="1-3">選項3</el-menu-item>
            </el-menu-item-group>
            <el-submenu index="1-4">
              <template slot="title">選項4</template>
              <el-menu-item index="1-4-1">選項4-1</el-menu-item>
            </el-submenu>
          </el-submenu>
          <el-submenu index="2">
            <template slot="title">
              <i class="el-icon-menu"></i>
              <span slot="title">導航二</span>
            </template>
            <el-menu-item-group>
              <template slot="title">分組一</template>
              <el-menu-item index="2-1">選項1</el-menu-item>
              <el-menu-item index="2-2">選項2</el-menu-item>
            </el-menu-item-group>
            <el-menu-item-group title="分組2">
              <el-menu-item index="2-3">選項3</el-menu-item>
            </el-menu-item-group>
            <el-submenu index="2-4">
              <template slot="title">選項4</template>
              <el-menu-item index="2-4-1">選項4-1</el-menu-item>
            </el-submenu>
          </el-submenu>
          <el-submenu index="3">
            <template slot="title">
              <i class="el-icon-setting"></i>
              <span slot="title">導航三</span>
            </template>
            <el-menu-item-group>
              <template slot="title">分組一</template>
              <el-menu-item index="3-1">選項1</el-menu-item>
              <el-menu-item index="3-2">選項2</el-menu-item>
            </el-menu-item-group>
            <el-menu-item-group title="分組2">
              <el-menu-item index="3-3">選項3</el-menu-item>
            </el-menu-item-group>
            <el-submenu index="3-4">
              <template slot="title">選項4</template>
              <el-menu-item index="3-4-1">選項4-1</el-menu-item>
            </el-submenu>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!--右邊-->
      <el-container>
        <!--頭部-->
        <el-header style="font-size: 12px; border-bottom: 1px solid #ccc; line-height: 60px;display: flex">
          <div style="flex: 1;font-size: 20px">
            <span :class="collapseBtnClass" style="cursor: pointer" @click="collapse"></span>
          </div>
          <el-dropdown style="width: 70px;cursor: pointer">
            <span>王小虎<i class="el-icon-arrow-down" style="margin-left: 5px"></i></span>
            <el-dropdown-menu slot="dropdown">
              <el-dropdown-item>個人資訊</el-dropdown-item>
              <el-dropdown-item>退出</el-dropdown-item>
            </el-dropdown-menu>
          </el-dropdown>
        </el-header>
        <!--主體-->
        <el-main>

          <div class="mg-10">
            <el-input v-model="username" style="width: 200px" suffix-icon="el-icon-search" placeholder="請輸入名稱"></el-input>
            <el-input v-model="email" style="width: 200px" suffix-icon="el-icon-message" placeholder="請輸入郵箱" class="ml-5"></el-input>
            <el-input v-model="address" style="width: 200px" suffix-icon="el-icon-position" placeholder="請輸入地址" class="ml-5"></el-input>
            <el-button class="ml-5" type="primary" @click="findPage()">搜尋</el-button>
          </div>

          <div class="mg-10">
            <el-button type="primary">新增 <i class="el-icon-circle-plus-outline"></i></el-button>
            <el-button type="danger">批量刪除 <i class="el-icon-remove-outline"></i></el-button>
            <el-button type="primary">匯入 <i class="el-icon-bottom"></i></el-button>
            <el-button type="primary">匯出 <i class="el-icon-top"></i></el-button>
          </div>

          <el-table :data="tableData" border stripe :header-cell-class-name="headerBg">
            <el-table-column prop="id" label="ID" width="120">
            </el-table-column>
            <el-table-column prop="username" label="使用者名稱" width="80">
            </el-table-column>
            <el-table-column prop="password" label="密碼" width="120">
            </el-table-column>
            <el-table-column prop="nickname" label="暱稱" width="120">
            </el-table-column>
            <el-table-column prop="email" label="郵箱" width="200">
            </el-table-column>
            <el-table-column prop="phone" label="電話" width="120">
            </el-table-column>
            <el-table-column prop="address" label="地址" width="250">
            </el-table-column>
            <el-table-column label="操作" width="210">
              <template slot-scope="scope">
                <el-button type="success">編輯 <i class="el-icon-edit"></i></el-button>
                <el-button type="danger">刪除 <i class="el-icon-remove-outline"></i></el-button>
              </template>
            </el-table-column>
          </el-table>

          <!-- 分頁
              分頁資料和表格資料產生了聯動
              前端傳的值:
                :current-page="pageNum" 頁碼
                :page-size="pageSize" 每頁個數
              後端傳的值:
                :total="total" 總條數
          -->
          <div style="padding: 10px 0">
            <el-pagination
                @size-change="handleSizeChange"
                @current-change="handleCurrentChange"
                :current-page="pageNum"
                :page-sizes="[ 2, 5, 10, 15]"
                :page-size="pageSize"
                layout="total, sizes, prev, pager, next, jumper"
                :total="total">
            </el-pagination>
          </div>
        </el-main>

      </el-container>
    </el-container>
  </div>
</template>

<script>
// @ is an alias to /src
import HelloWorld from '@/components/HelloWorld.vue'

export default {
  name: 'Home',
  data() {
    return {
      tableData: [],
      total: 0, // 分頁總條數
      pageNum: 1, // 頁數
      pageSize: 2, // 條數
      username: "", // 查詢繫結username
      email: "", // 查詢繫結email
      address: "", // 查詢繫結address
      msg: 'Hello Word',
      collapseBtnClass: 'el-icon-s-fold', // 收縮圖示控制 預設展開
      isCollapse: false, // 點選收縮圖示控制 預設是展開 false
      sideWidth: 200, // 導航欄寬度 動態 初始值是200
      logoTextShow: true, // 預設是顯示的標題 當收縮是為false
      headerBg: "headerBg"
    }
  },
  created() {
    this.findPage()
  },
  methods: {
    collapse (){ // 點選收縮按鈕時會觸發按鈕
      this.isCollapse = !this.isCollapse
      if (this.isCollapse) { // 收縮
        this.sideWidth = 64
        this.collapseBtnClass = 'el-icon-s-unfold' // 縮起圖示控制
        this.logoTextShow = false // 收縮是不顯示文字
      }else { // 展開
        this.sideWidth = 200
        this.collapseBtnClass = 'el-icon-s-fold' // 展開圖示控制
        this.logoTextShow = true // 顯示文字
      }
    },
    handleSizeChange(pageSize) {
      console.log(`每頁 ${pageSize} 條`);
      // 傳給我們上面繫結的pageSize
      this.pageSize = pageSize
      // 請求資料,請求資料之後它會自動更新 pageSize
      this.findPage()
    },
    handleCurrentChange(pageNum) {
      console.log(`當前頁: ${pageNum}`);
      // 傳給我們上面繫結的pageNum
      this.pageNum = pageNum
      // 請求資料,請求資料之後它會自動更新 tableData
      this.findPage()
    },
    findPage() {
      // 請求分頁查詢資料 fetch api 有以下幾個引數,第一個引數是url
      // .then 返回一個res,之後對他進行一個json的處理,因為他返回的res是一個字串,需要把字串轉成json
      // 通過res.json()函式 這個方法,把他轉成json,再.then 這個res就是json型別的了
      // 拼接url路徑使用es6的語法:`http://localhost:8081/user/findPage/${pageNum}`
      fetch("http://localhost:8081/user/findPage?pageNum="+this.pageNum+"&pageSize="+this.pageSize+"&username="+this.username).then(res => res.json()).then(res => {
        console.log(res)
        this.tableData = res.data
        this.total = res.total
        // 查詢後清空查詢條件
        this.username = ""
        this.email = ""
        this.address = ""
      })
    }
  }
}
</script>

<style>
.home {
  height: 100%;
}
.el-menu-item,.el-menu-item-group, .el-submenu__title{
  background-color: rgb(48, 65, 86);
}
</style>

後端程式碼

    Controller層

@Autowired
SysUserMapper userMapper;
/**
 * @description: 分頁查詢 因為是查詢多條資料所以是list
 * @param: pageNum、pageSize
 * @return: java.util.Map<java.lang.String,java.lang.Object>
 * @author ls
 * @date: 2022/4/18
 * 介面路徑 /user/findPage?pageNum=1 & pageSize=10
 * @RequestParam 它接收 ?pageNum=1 & pageSize=10 這樣的資料 它會把url引數裡的pageNum和pageSize中的值(也就是1和10)對映到引數列表中去,這就是他的這個資料接收
 * (pageNum - 1) * pageSize = limit 第一個引數
 * pageSize 第二個引數
 */
@GetMapping("/findPage")
public Map<String , Object> findPage(@RequestParam Integer pageNum,@RequestParam Integer pageSize){
    // 第一個引數 pageNum
    pageNum = (pageNum - 1) * pageSize;
    List<SysUser> data = userMapper.findPage(pageNum, pageSize);
    // 因為不知道總條數 所以查詢出總條數
    Integer total = userMapper.selectTotal();
    // 封裝一個map
    Map<String , Object> res = new HashMap<>();
    // 往map裡面存放資料
    res.put("data", data);
    res.put("total", total);
    return res;
}

    Mapper層 

/** 
 * @description: 分頁查詢 因為是查詢多條資料所以是list
 * @param: pageNum、pageSize
 * @return: java.util.List<com.boot.springboot.entity.SysUser> 
 * @author ls
 * @date: 2022/4/18 
 */ 
@Select("select * from sys_user limit #{pageNum}, #{pageSize}")
List<SysUser> findPage(@Param("pageNum") Integer pageNum,@Param("pageSize") Integer pageSize);

/** 
 * @description: 因為不知道總條數 所以查詢出總條數 
 * @param:  
 * @return: java.lang.Integer 
 * @author ls
 * @date: 2022/4/18 
 */ 
@Select("select count(*) from sys_user")
Integer selectTotal();

     這裡省略了service和它的實現類