Mysql使用concat函数实现关键字模糊查询功能(列表数据过滤含前后端代码)

1. Introduction

In this article, we will discuss how to implement fuzzy search functionality using the CONCAT function in MySQL. Fuzzy search allows users to search for keywords that are similar to the entered search term. This can be particularly useful when dealing with large datasets or when users are uncertain about the exact keywords they are searching for.

2. How Fuzzy Search Works

Fuzzy search involves matching keywords based on their similarity rather than their exact match. In MySQL, we can achieve this using the CONCAT function, which concatenates two or more strings together. By using the CONCAT function, we can construct a query that matches keywords even if they are not an exact match.

2.1. Example Scenario

Let's consider a scenario where we have a table named "products" that contains a list of products. Each product has a name and a description field. We want to implement a fuzzy search functionality that allows users to search for products based on their name or description.

2.2. Implementing Fuzzy Search

To implement fuzzy search, we will use the CONCAT function to combine the name and description fields into a single string. We will then use the LIKE operator with the CONCAT function in the WHERE clause to match this combined string with the search term provided by the user.

SELECT * FROM products

WHERE CONCAT(name, description) LIKE '%search_term%';

Here, "search_term" is the search term entered by the user. The '%' symbols before and after the search term are wildcards that match any characters before and after the search term.

3. Example Query

Let's consider an example query to understand how fuzzy search works in MySQL.

3.1. Table Structure

First, let's define the structure of the "products" table:

CREATE TABLE products (

id INT(11) NOT NULL AUTO_INCREMENT,

name VARCHAR(100) NOT NULL,

description TEXT NOT NULL,

PRIMARY KEY (id)

);

3.2. Inserting Sample Data

Next, let's insert some sample data into the "products" table:

INSERT INTO products (name, description)

VALUES

('Apple iPhone X', 'The latest iPhone model from Apple.'),

('Samsung Galaxy S10', 'The flagship smartphone from Samsung.'),

('Google Pixel 3', 'Google\'s smartphone with an excellent camera.'),

('OnePlus 6T', 'A high-performance smartphone at an affordable price.');

3.3. Fuzzy Search Query

Now, let's construct a fuzzy search query to search for products that contain the term "smartphone":

SELECT * FROM products

WHERE CONCAT(name, description) LIKE '%smartphone%';

3.4. Result

The query above will return the following result:

| id | name | description |

|----|-------------------|--------------------------------------|

| 1 | Apple iPhone X | The latest iPhone model from Apple. |

| 2 | Samsung Galaxy S10| The flagship smartphone from Samsung.|

| 3 | Google Pixel 3 | Google's smartphone with an excellent camera.|

| 4 | OnePlus 6T | A high-performance smartphone at an affordable price.|

4. Conclusion

In this article, we have discussed how to implement fuzzy search functionality using the CONCAT function in MySQL. Fuzzy search allows users to search for keywords that are similar to the entered search term. By using the CONCAT function and the LIKE operator, we can construct a query that matches keywords even if they are not an exact match. This functionality can be useful in scenarios where users are uncertain about the exact keywords they are searching for or when dealing with large datasets.

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