search
HomeBackend DevelopmentPHP Tutorial请教sql查询2张表的问题

请教sql查询2张表的问题:
A表为
id title picid
其中picid存储信息为
a:4:{s:6:"attach";s:2:"74";s:9:"show_type";s:1:"0";s:9:"user_bind";s:1:"1";s:10:"topic_bind";s:0:"";}

B表为
p_id purl
我首先通过查询A表获得了picid字段中的attach数据,输出为数组形式为
aryy{
【0】74
【1】88
....
}
那么我如何通过查询A表得到的attach去查询B表 p_id 为74 88的匹配id呢?
能给个代码解释下吗?


回复讨论(解决方案)

设第一步得到的数组为
$ar = array(74, 88);
则有
$sql = 'select * from B表 where p_id in (' . join(',', $ar) . ')';

如果 picid 中 attach 出现的次序是固定的话,还可以直接关联两表查询

比如
select p_id, purl from B表, A表 where p_id = SUBSTRING_INDEX(SUBSTRING_INDEX(picid, 4), '"', -1)

设第一步得到的数组为
$ar = array(74, 88);
则有
$sql = 'select * from B表 where p_id in (' . join(',', $ar) . ')';

如果 picid 中 attach 出现的次序是固定的话,还可以直接关联两表查询

如果出现次序不是固定的呢?能关联两表查询吗

用 LOCATE 函数先定位,应该也是可以的

Statement
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
Working with Flash Session Data in LaravelWorking with Flash Session Data in LaravelMar 12, 2025 pm 05:08 PM

Laravel simplifies handling temporary session data using its intuitive flash methods. This is perfect for displaying brief messages, alerts, or notifications within your application. Data persists only for the subsequent request by default: $request-

cURL in PHP: How to Use the PHP cURL Extension in REST APIscURL in PHP: How to Use the PHP cURL Extension in REST APIsMar 14, 2025 am 11:42 AM

The PHP Client URL (cURL) extension is a powerful tool for developers, enabling seamless interaction with remote servers and REST APIs. By leveraging libcurl, a well-respected multi-protocol file transfer library, PHP cURL facilitates efficient execution of various network protocols, including HTTP, HTTPS, and FTP. This extension offers granular control over HTTP requests, supports multiple concurrent operations, and provides built-in security features.

Simplified HTTP Response Mocking in Laravel TestsSimplified HTTP Response Mocking in Laravel TestsMar 12, 2025 pm 05:09 PM

Laravel provides concise HTTP response simulation syntax, simplifying HTTP interaction testing. This approach significantly reduces code redundancy while making your test simulation more intuitive. The basic implementation provides a variety of response type shortcuts: use Illuminate\Support\Facades\Http; Http::fake([ 'google.com' => 'Hello World', 'github.com' => ['foo' => 'bar'], 'forge.laravel.com' =>

12 Best PHP Chat Scripts on CodeCanyon12 Best PHP Chat Scripts on CodeCanyonMar 13, 2025 pm 12:08 PM

Do you want to provide real-time, instant solutions to your customers' most pressing problems? Live chat lets you have real-time conversations with customers and resolve their problems instantly. It allows you to provide faster service to your custom

Explain the concept of late static binding in PHP.Explain the concept of late static binding in PHP.Mar 21, 2025 pm 01:33 PM

Article discusses late static binding (LSB) in PHP, introduced in PHP 5.3, allowing runtime resolution of static method calls for more flexible inheritance.Main issue: LSB vs. traditional polymorphism; LSB's practical applications and potential perfo

PHP Logging: Best Practices for PHP Log AnalysisPHP Logging: Best Practices for PHP Log AnalysisMar 10, 2025 pm 02:32 PM

PHP logging is essential for monitoring and debugging web applications, as well as capturing critical events, errors, and runtime behavior. It provides valuable insights into system performance, helps identify issues, and supports faster troubleshoot

Discover File Downloads in Laravel with Storage::downloadDiscover File Downloads in Laravel with Storage::downloadMar 06, 2025 am 02:22 AM

The Storage::download method of the Laravel framework provides a concise API for safely handling file downloads while managing abstractions of file storage. Here is an example of using Storage::download() in the example controller:

Global View Data Management in LaravelGlobal View Data Management in LaravelMar 06, 2025 am 02:42 AM

Laravel's View::share method offers a streamlined approach to making data accessible across all your application's views. This is particularly useful for managing global settings, user preferences, or recurring UI components. In Laravel development,

See all articles

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

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
2 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. Best Graphic Settings
2 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. How to Fix Audio if You Can't Hear Anyone
2 weeks agoBy尊渡假赌尊渡假赌尊渡假赌

Hot Tools

PhpStorm Mac version

PhpStorm Mac version

The latest (2018.2.1) professional PHP integrated development tool

VSCode Windows 64-bit Download

VSCode Windows 64-bit Download

A free and powerful IDE editor launched by Microsoft

WebStorm Mac version

WebStorm Mac version

Useful JavaScript development tools

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)