Home Database Mysql Tutorial MySQL使用字符串作为查询条件

MySQL使用字符串作为查询条件

Jun 07, 2016 pm 04:42 PM
database

前言:今天在做MySQL的查询时遇到一个问题,情景是这样的,假如现在我的一张表里面有一个字段scode(表示商品编号),然后有一个

前言:今天在做MySQL的查询时遇到一个问题,情景是这样的,假如现在我的一张表里面有一个字段scode(表示商品编号),然后有一个字符串存储了多个商品编号,如“0001ME,0002BL”是一个字符串,假如叫str,本来是打算使用in的方式,就是说想把str作为in的条件,如下where scode in “0001ME,0002BL”,但是没有成功,然后就查阅MySQL的文档,找各种函数,最后发现了instr这个函数,问题解决了,下面说一下结果过程

1.开始的时候一直在将字符串str转换为类似的in参数,如下

SELECT * FROM stocks_orderlist s where s.scode in ("0001ME","0002BL") LIMIT 10;

SELECT CONVERT(CONCAT("\'",REPLACE("0001ME,0002BL","\,","\'\,\'"),"\'"),CHAR);

SELECT * FROM stocks_orderlist s where s.scode in (CONVERT(CONCAT("\"",REPLACE("0001ME,0002BL","\,","\"\,\""),"\""),CHAR)) LIMIT 10;

虽然把str转成了in所要的东西,但是后来想想,in的参数是一个列表集合,我及时把str转换成了所谓的in参数的形式,,但是肯定还是一个字符串,于是又忙碌了半天,有点想放弃的感觉,但是回头想想,肯定是自己没有找到合适的办法,于是就找到了instr函数

2.instr函数,看帮助文档的意思是找出substr在str中第一次出现问题,尝试如下

SELECT INSTR("0001ME,0002BL","0003ME");
SELECT INSTR("0001ME,0002BL","0001ME");
SELECT INSTR("0001ME,0002BL","0002BL");
SELECT * FROM stocks_orderlist s where INSTR("0001ME,0002BL",s.scode);

总结:看起来很小的一个方法,假如不知道方法的时候却很痛苦啊。

--------------------------------------分割线 --------------------------------------

Ubuntu 14.04下安装MySQL

《MySQL权威指南(原书第2版)》清晰中文扫描版 PDF

Ubuntu 14.04 LTS 安装 LNMP Nginx\PHP5 (PHP-FPM)\MySQL

Ubuntu 14.04下搭建MySQL主从服务器

Ubuntu 12.04 LTS 构建高可用分布式 MySQL 集群

Ubuntu 12.04下源代码安装MySQL5.6以及Python-MySQLdb

MySQL-5.5.38通用二进制安装

--------------------------------------分割线 --------------------------------------

本文永久更新链接地址:

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

How does Go language implement the addition, deletion, modification and query operations of the database? How does Go language implement the addition, deletion, modification and query operations of the database? Mar 27, 2024 pm 09:39 PM

Go language is an efficient, concise and easy-to-learn programming language. It is favored by developers because of its advantages in concurrent programming and network programming. In actual development, database operations are an indispensable part. This article will introduce how to use Go language to implement database addition, deletion, modification and query operations. In Go language, we usually use third-party libraries to operate databases, such as commonly used sql packages, gorm, etc. Here we take the sql package as an example to introduce how to implement the addition, deletion, modification and query operations of the database. Assume we are using a MySQL database.

iOS 18 adds a new 'Recovered' album function to retrieve lost or damaged photos iOS 18 adds a new 'Recovered' album function to retrieve lost or damaged photos Jul 18, 2024 am 05:48 AM

Apple's latest releases of iOS18, iPadOS18 and macOS Sequoia systems have added an important feature to the Photos application, designed to help users easily recover photos and videos lost or damaged due to various reasons. The new feature introduces an album called "Recovered" in the Tools section of the Photos app that will automatically appear when a user has pictures or videos on their device that are not part of their photo library. The emergence of the "Recovered" album provides a solution for photos and videos lost due to database corruption, the camera application not saving to the photo library correctly, or a third-party application managing the photo library. Users only need a few simple steps

How does Hibernate implement polymorphic mapping? How does Hibernate implement polymorphic mapping? Apr 17, 2024 pm 12:09 PM

Hibernate polymorphic mapping can map inherited classes to the database and provides the following mapping types: joined-subclass: Create a separate table for the subclass, including all columns of the parent class. table-per-class: Create a separate table for subclasses, containing only subclass-specific columns. union-subclass: similar to joined-subclass, but the parent class table unions all subclass columns.

An in-depth analysis of how HTML reads the database An in-depth analysis of how HTML reads the database Apr 09, 2024 pm 12:36 PM

HTML cannot read the database directly, but it can be achieved through JavaScript and AJAX. The steps include establishing a database connection, sending a query, processing the response, and updating the page. This article provides a practical example of using JavaScript, AJAX and PHP to read data from a MySQL database, showing how to dynamically display query results in an HTML page. This example uses XMLHttpRequest to establish a database connection, send a query and process the response, thereby filling data into page elements and realizing the function of HTML reading the database.

Detailed tutorial on establishing a database connection using MySQLi in PHP Detailed tutorial on establishing a database connection using MySQLi in PHP Jun 04, 2024 pm 01:42 PM

How to use MySQLi to establish a database connection in PHP: Include MySQLi extension (require_once) Create connection function (functionconnect_to_db) Call connection function ($conn=connect_to_db()) Execute query ($result=$conn->query()) Close connection ( $conn->close())

How to handle database connection errors in PHP How to handle database connection errors in PHP Jun 05, 2024 pm 02:16 PM

To handle database connection errors in PHP, you can use the following steps: Use mysqli_connect_errno() to obtain the error code. Use mysqli_connect_error() to get the error message. By capturing and logging these error messages, database connection issues can be easily identified and resolved, ensuring the smooth running of your application.

Tips and practices for handling Chinese garbled characters in databases with PHP Tips and practices for handling Chinese garbled characters in databases with PHP Mar 27, 2024 pm 05:21 PM

PHP is a back-end programming language widely used in website development. It has powerful database operation functions and is often used to interact with databases such as MySQL. However, due to the complexity of Chinese character encoding, problems often arise when dealing with Chinese garbled characters in the database. This article will introduce the skills and practices of PHP in handling Chinese garbled characters in databases, including common causes of garbled characters, solutions and specific code examples. Common reasons for garbled characters are incorrect database character set settings: the correct character set needs to be selected when creating the database, such as utf8 or u

How to connect to remote database using Golang? How to connect to remote database using Golang? Jun 01, 2024 pm 08:31 PM

Through the Go standard library database/sql package, you can connect to remote databases such as MySQL, PostgreSQL or SQLite: create a connection string containing database connection information. Use the sql.Open() function to open a database connection. Perform database operations such as SQL queries and insert operations. Use defer to close the database connection to release resources.

See all articles