Let's talk about the implementation method of multi-combination condition query under uniapp

Uniapp is a cross-platform application development framework based on the Vue.js framework. It can support multi-terminal unified development, reduce duplication of labor and code duplication in the development process, and improve development efficiency. During the development process, we often need to perform data query operations, and multi-combination condition query is a relatively common operation. The following will introduce the implementation method of multi-combination condition query under uniapp.

1. Overview

Multi-combination condition query refers to using multiple query conditions to filter data in a SQL query statement. For example, in a product list, we need to filter products based on product name, brand, price and other conditions. In uniapp, we can use various APIs and components to implement multi-combination condition queries.

2. Implementation method

1. Conditional input: In uniapp, we can use various input components, such as input, select, etc., to realize conditional input. At the same time, we can use v- The model directive binds the data entered by the user to the data of the Vue instance.

2. Condition splicing: In SQL query statements, multiple combination query conditions need to use logical symbols such as AND or OR to splice the conditions together. In uniapp, we can use the data in the Vue instance for conditional splicing, and then insert the spliced ​​conditions into the SQL statement during query.

3. Data query: In uniapp, you can use various APIs and frameworks to perform database query operations. For example, you can use uni.request() to send an HTTP request to obtain the required data from the server; you can also use the API in uni-app-plus to query local data.

3. Sample code

The following is a simple sample code that shows how to implement multi-combination condition query under uniapp:

<template>
  <view class="container">
    <input v-model="name" placeholder="请输入商品名称" />
    <select v-model="brand">
      <option value="">请选择品牌</option>
      <option value="huawei">华为</option>
      <option value="xiaomi">小米</option>
      <option value="oppo">OPPO</option>
    </select>
    <input v-model="price" placeholder="请输入价格范围" />
    <button @click="search">搜索</button>
    <view class="result">
      <view v-for="(item,index) in list" :key="index">{{item.name}} {{item.brand}} {{item.price}}</view>
    </view>
  </view>
</template>

<script>
export default {
  data() {
    return {
      name: "",
      brand: "",
      price: "",
      list: []
    };
  },
  methods: {
    search() {
      let sql = "SELECT * FROM product WHERE 1=1 ";
      if (this.name) {
        sql += `AND name LIKE '%${this.name}%' `;
      }
      if (this.brand) {
        sql += `AND brand = '${this.brand}' `;
      }
      if (this.price) {
        let priceArr = this.price.split("-");
        sql += `AND price >= ${priceArr[0]} AND price <= ${priceArr[1]} `;
      }
      //在这里使用框架或者API进行数据查询操作
    }
  }
};
</script>

In the above code, we Multiple components such as input and select are used to implement conditional input, and then the search method is used to splice the input conditions, and finally a framework or API is used for data query operations.

4. Summary

The method of implementing multi-combination condition query in uniapp is relatively flexible and can be implemented using various components and APIs according to the actual situation. At the same time, you need to pay attention to data security to prevent security issues such as SQL injection. Through the introduction of this article, I believe that everyone can already master the implementation method of multi-combination condition query under uniapp.

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