class Mapp { /** * @var integer $id * * @ORM\Column(name="id", type="integer", nullable=false) * @ORM\Id * @ORM\GeneratedValue(strategy="IDENTITY") */ private $id; /** * @var string $name * * @ORM\Column(name="name", type="string", length=255, nullable=false) */ private $name; /** * @var string $saysay * * @ORM\Column(name="saysay", type="string", length=255, nullable=false) */ private $saysay; /** * @var string $log * * @ORM\Column(name="log", type="text", nullable=false) */ private $log; } class People { /** * @var integer $id * * @ORM\Column(name="id", type="integer", nullable=false) * @ORM\Id * @ORM\GeneratedValue(strategy="IDENTITY") */ private $id; /** * @var string $name * * @ORM\Column(name="name", type="string", length=255, nullable=false) */ private $name; /** * @var string $discuss * * @ORM\Column(name="discuss", type="string", length=255, nullable=false) */ private $discuss; }
回复内容:
class Mapp { /** * @var integer $id * * @ORM\Column(name="id", type="integer", nullable=false) * @ORM\Id * @ORM\GeneratedValue(strategy="IDENTITY") */ private $id; /** * @var string $name * * @ORM\Column(name="name", type="string", length=255, nullable=false) */ private $name; /** * @var string $saysay * * @ORM\Column(name="saysay", type="string", length=255, nullable=false) */ private $saysay; /** * @var string $log * * @ORM\Column(name="log", type="text", nullable=false) */ private $log; } class People { /** * @var integer $id * * @ORM\Column(name="id", type="integer", nullable=false) * @ORM\Id * @ORM\GeneratedValue(strategy="IDENTITY") */ private $id; /** * @var string $name * * @ORM\Column(name="name", type="string", length=255, nullable=false) */ private $name; /** * @var string $discuss * * @ORM\Column(name="discuss", type="string", length=255, nullable=false) */ private $discuss; }
友情提示:Doctrine 2的Mapping信息(映射信息)可以用XML,YAML,PHP和注解这四种格式来编写。
A和B的一对一关系,在数据库里,可以在A上弄个字段存相应B记录的ID,也可以反过来在B上存A的ID,也可以互相存ID,这个是Doctrine 2里所说的关联方向。
你问题例子里的是注解方式的,那我就说注解的:
(1)单向,在A表上产生一个字段来存B的ID。
/** @Entity **/ class A { // ... /** * @OneToOne(targetEntity="B") * @JoinColumn(name="b_id", referencedColumnName="id") **/ private $b; public function getB() { return $this->b; } } /** @Entity **/ class B { // ... }
在拿到A的情况下,可以用$a->getB()来获得与$a关联的B。
joinColumn那一句,大多数情况是可以省略的,Doctrine 2会自动生成关联字段的名称。
(1)双向
/** @Entity **/ class A { // ... /** * @OneToOne(targetEntity="B", mappedBy="a") **/ private $b; public function getB() { return $this->b; } } /** @Entity **/ class B { // ... /** * @OneToOne(targetEntity="A", inversedBy="b") **/ private $a; public function getA() { return $this->a; } }
$a->getB()和$b->getA(),都可以直接取关联对象。
targetEntity(关联哪个对象/表)里多了一个mappedBy和inversedBy,他们的值,其实就是被关联对象上用来保存关联ID的属性的名字。
标记了mappedBy的,将成为关联关系的“拥有者”。

APHPDependencyInjectionContainerisatoolthatmanagesclassdependencies,enhancingcodemodularity,testability,andmaintainability.Itactsasacentralhubforcreatingandinjectingdependencies,thusreducingtightcouplingandeasingunittesting.

Select DependencyInjection (DI) for large applications, ServiceLocator is suitable for small projects or prototypes. 1) DI improves the testability and modularity of the code through constructor injection. 2) ServiceLocator obtains services through center registration, which is convenient but may lead to an increase in code coupling.

PHPapplicationscanbeoptimizedforspeedandefficiencyby:1)enablingopcacheinphp.ini,2)usingpreparedstatementswithPDOfordatabasequeries,3)replacingloopswitharray_filterandarray_mapfordataprocessing,4)configuringNginxasareverseproxy,5)implementingcachingwi

PHPemailvalidationinvolvesthreesteps:1)Formatvalidationusingregularexpressionstochecktheemailformat;2)DNSvalidationtoensurethedomainhasavalidMXrecord;3)SMTPvalidation,themostthoroughmethod,whichchecksifthemailboxexistsbyconnectingtotheSMTPserver.Impl

TomakePHPapplicationsfaster,followthesesteps:1)UseOpcodeCachinglikeOPcachetostoreprecompiledscriptbytecode.2)MinimizeDatabaseQueriesbyusingquerycachingandefficientindexing.3)LeveragePHP7 Featuresforbettercodeefficiency.4)ImplementCachingStrategiessuc

ToimprovePHPapplicationspeed,followthesesteps:1)EnableopcodecachingwithAPCutoreducescriptexecutiontime.2)ImplementdatabasequerycachingusingPDOtominimizedatabasehits.3)UseHTTP/2tomultiplexrequestsandreduceconnectionoverhead.4)Limitsessionusagebyclosin

Dependency injection (DI) significantly improves the testability of PHP code by explicitly transitive dependencies. 1) DI decoupling classes and specific implementations make testing and maintenance more flexible. 2) Among the three types, the constructor injects explicit expression dependencies to keep the state consistent. 3) Use DI containers to manage complex dependencies to improve code quality and development efficiency.

DatabasequeryoptimizationinPHPinvolvesseveralstrategiestoenhanceperformance.1)Selectonlynecessarycolumnstoreducedatatransfer.2)Useindexingtospeedupdataretrieval.3)Implementquerycachingtostoreresultsoffrequentqueries.4)Utilizepreparedstatementsforeffi


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

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

Hot Article

Hot Tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Dreamweaver CS6
Visual web development tools

WebStorm Mac version
Useful JavaScript development tools

PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool

mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),
