2024年1月Java项目开发指南16：用户自由选择字段查询、是否模糊查询

我们希望用户可以自己控制是否要模糊查询

用户可以自由的选择字段去查询。

如上图，我在前端页面准备了

• 多选框：决定是否模糊查询。（True or False）
• 下拉选择框：决定要查询关键词的所属字段
• 输入框：决定关键词
• 按钮：发起请求

肯定要传参数的，所有这个接口请求方式设置为Post。考虑到方便接收参数，我们使用post的param方式传参（不了解这个的可以看我之前的笔记 https://www.cnblogs.com/mllt/p/17990445/project202401-14）

export function user_search(data){
    return postWithParams("/users/search",data)
}

现在我们先编写按钮事件 userSearch()

const userSearch=()=>{
  //配置参数
  let data={
    "like":checked.value,//是否模糊查询
    "key":ziduan_select.value,//字段名称
    "word":keyword.value//关键词

  }
  //发送请求
  user_search(data).then((res)=>{
    if(res["code"]===1){
      message.success(res["msg"]);
      dataSource.value=res["data"]
    }else {
      message.error(res["msg"]);
    }
  })
}

接下来去编写后端接口

Controller：

    // 条件查询
    @PostMapping("/search")
    public ResponseEntity<?> searchUsers(@RequestParam boolean like,@RequestParam  String key,@RequestParam String word) {
        List<Users> users = usersService.searchUsers(like, key, word);
        return ResponseEntity.success(users);
    }

Service

    List<Users> searchUsers(boolean like, String key, String word);

ServiceImpl

 @Override
    public List<Users> searchUsers(boolean like, String key, String word) {
        if(like){
            return usersMapper.searchUsersLike(key,word);
        }else{
            return usersMapper.searchUsersNoLike(key,word);
        }
    }

mapper

    //自定义字段模糊查询
    @Select("select * from users where `${key}` LIKE CONCAT('%', #{word}, '%')")
    List<Users> searchUsersLike(@Param("key") String key, @Param("word") String word);
    @Select("select * from users where `${key}` = #{word}")
    List<Users> searchUsersNoLike(String key, String word);

完毕，就是如此简单。

我把前端的这个组件的完整代码贴出来

<script setup>
import {PlusSquareOutlined,SearchOutlined} from "@ant-design/icons-vue";
import {onMounted, reactive, ref} from "vue";
import {user_delete_by_id, user_get_list, user_search, user_update} from "../../../apis/UserApi.js";
import { cloneDeep } from 'lodash-es';
import {message} from "ant-design-vue";

onMounted(()=>{
  user_get_list().then((res)=>{
    dataSource.value=res.data
    //对得到的用户数据进行处理，以显示在表格中
  })
})
const columns = [
  {
    title: '操作',
    dataIndex: 'operation',
    width: '20%',
  },
  {
    title: '用户ID',
    dataIndex: 'userId',
    width: '10%',
  },
  {
    title: '昵称',
    dataIndex: 'userNickname',
    width: '10%',
  },
  {
    title: '账号',
    dataIndex: 'userAccount',
    width: '10%',
  },
  {
    title: '身份',
    dataIndex: 'userIdentity',
    width: '10%',
  },  {
    title: '权限',
    dataIndex: 'remarks',
    width: '10%',
  },
  {
    title: '注册时间',
    dataIndex: 'userRegTime',
    width: '25%',
  },

];
const dataSource = ref([]);
const editableData = reactive({});
const edit = key => {
  editableData[key] = cloneDeep(dataSource.value.filter(item => key === item.userId)[0]);
};
const save = key => {
  Object.assign(dataSource.value.filter(item => key === item.userId)[0], editableData[key]);
  delete editableData[key];
  // 找到要更新的用户的索引
  const userIndex = dataSource.value.findIndex(item => key === item.userId)
  // 调用更新用户的函数
  const updatedUser = dataSource.value[userIndex];
  console.log(updatedUser)
  user_update(updatedUser)
      .then(response => {
        // 处理响应，例如显示成功消息
        // console.log('User updated successfully', response);
        message.success(response["msg"])
      })
      .catch(error => {
        // 处理错误，例如显示错误消息
        // console.error('Failed to update user', error);
        message.error(error)
      });

};
const cancel = key => {
  delete editableData[key];
};
const formatDate= (dateTimeStr)=> {
  if (dateTimeStr === '' || dateTimeStr==null) {
    return ''; // 返回空字符串或者其他占位符
  }
  // 使用 Date 对象解析日期时间字符串
  const date = new Date(dateTimeStr);
  // 检查日期对象是否有效
  if (isNaN(date.getTime())) {
    return ''; // 返回空字符串或者其他占位符
  }
  const year = date.getFullYear();
  const month = String(date.getMonth() + 1).padStart(2, '0');
  const day = String(date.getDate()).padStart(2, '0');
  const hours = String(date.getHours()).padStart(2, '0');
  const minutes = String(date.getMinutes()).padStart(2, '0');
  const seconds = String(date.getSeconds()).padStart(2, '0');
  return `${year}-${month}-${day} ${hours}:${minutes}:${seconds}`;
}

const checked = ref(true);
const keyword=ref("")
const ziduan_select=ref("user_id")
const ziduan=ref([{
  value: 'user_id',
  label: '用户ID',
},
  {
    value: 'user_nickname',
    label: '昵称',
  },
  {
    value: 'user_account',
    label: '用户账号',
  },])
const onDelete = key => {
  let uid = key
  dataSource.value = dataSource.value.filter(item => item.userId !== key);
  user_delete_by_id(uid).then((res)=>{
    if(res["code"]===1){
      message.success(res["msg"]);
    }else {
      message.error(res["msg"]);
    }
  })
};

const userSearch=()=>{
  //配置参数
  let data={
    "like":checked.value,//是否模糊查询
    "key":ziduan_select.value,//字段名称
    "word":keyword.value//关键词

  }
  //发送请求
  user_search(data).then((res)=>{
    if(res["code"]===1){
      message.success(res["msg"]);
      dataSource.value=res["data"]
    }else {
      message.error(res["msg"]);
    }
  })
}
</script>

<template>
  <br>
<div class="mytable">
  <a-breadcrumb>
    <a-breadcrumb-item><a href="/">主页</a></a-breadcrumb-item>
    <a-breadcrumb-item><a href="/user">用户管理</a></a-breadcrumb-item>
  </a-breadcrumb>
  <br>
  <hr>
  <br>
  <a-space>
    <a-checkbox v-model:checked="checked">模糊查询</a-checkbox>

      <a-select
          v-model:value="ziduan_select"
          style="width: 100px"
          :options="ziduan"
      ></a-select>

    <a-input v-model:value="keyword" placeholder="请输入关键词"/>

    <a-button type="primary" @click="userSearch">
      <template #icon>
        <SearchOutlined />
      </template>
      搜索
    </a-button>

  <a-button type="primary" >
    <template #icon>
      <PlusSquareOutlined />
    </template>
    新增用户
  </a-button>
  </a-space>

</div>

  <br>
  <a-table class="mytable" :columns="columns" :data-source="dataSource" bordered>
    <template #bodyCell="{ column, text, record }">
      <template v-if="['userNickname', 'userIdentity', 'userStatus','remarks'].includes(column.dataIndex)">
        <div>
          <a-input
              v-if="editableData[record.userId]"
              v-model:value="editableData[record.userId][column.dataIndex]"
              style="margin: -5px 0"
          />
          <template v-else>
            {{ text }}
          </template>
        </div>
      </template>
      <template v-else-if="column.dataIndex==='userRegTime'">
        {{formatDate(text)}}
      </template>
      <template v-else-if="column.dataIndex === 'operation'">
        <div class="editable-row-operations">
          <span v-if="editableData[record.userId]">
            <a-typography-link @click="save(record.userId)" style="margin: 14px">保存</a-typography-link>

            <a-popconfirm style="margin: 14px" title="放弃更改?" ok-text="放弃" cancel-text="取消" @confirm="cancel(record.userId)">
              <a>取消</a>
            </a-popconfirm>
          </span>
          <span v-else>
            <a @click="edit(record.userId)">编辑</a>
          </span>
        </div>

        <a-popconfirm
            v-if="dataSource.length"
            title="确认删除？"
            ok-text="确定" cancel-text="取消"
            @confirm="onDelete(record.userId)"
        >
          <a>删除</a>
        </a-popconfirm>
      </template>
    </template>
  </a-table>
</template>

<style scoped>
.mytable{
  margin: 0 auto;max-width: 960px;width: 90%; border-radius:5px;box-shadow: 0 5px 15px 2px rgba(0,0,0,0.2);padding: 1em;box-sizing: border-box;background: rgba(255,255,255,0.9)

}
</style>