本文实例讲述了yii的CURD操作技巧。分享给大家供大家参考。具体分析如下:
CURD是一个数据库技术中的缩写词,一般的项目开发的各种参数的基本功能都是CURD。它代表创建(Create)、更新(Update)、读取(Retrieve)和删除(Delete)操作。本文来讲讲Yii框架的CURD操作。
一、查询数据集合
1、
2、
findAllByPk($id,'name like ':name' and age=:age',array(':name'=>$name,'age'=>$age));
3、
4、
二、查询对像的方法
1、
2、
3、
4、
5、拼一个获得SQL的方法,在根据find查询出一个对象
$criteria->select='username'; // only select the 'title' column
$criteria->condition='username=:username';
$criteria->params=array(':username=>'admin');
$post=Post::model()->find($criteria); // $params isnot needed
三、查询个数,判断查询是否有结果
1、
2、
3、
四、添加的方法
$admin->username=$username;
$admin->password=$password;
if($admin->save()>0){
echo '添加成功';
}else{
echo '添加失败';
}
五、修改的方法
1、
$count =Admin::model()->updateAll(array('username'=>'11111′,'password'=>'11111′),'password=:pass',array(':pass'=>'1111a1′));
if($count>0){
echo '修改成功';
}else{
echo '修改失败';
}
2、
$count =Admin::model()->updateByPk(1,array('username'=>'admin','password'=>'admin'));
$count =Admin::model()->updateByPk(array(1,2),array('username'=>'admin','password'=>'admin'),'username=:name',array(':name'=>'admin'));
if($count>0){
echo '修改成功';
}else{
echo '修改失败';
}
$pk 代表主键,可以是一个也可以是一个集合,$attributes代表是要修改的字段的集合,$condition代表条件,$params传入的值
3、
$count=Admin::model()->updateCounters(array('status'=>1),'username=:name',array(':name'=>'admin'));
if($count>0){
echo '修改成功';
}else{
echo '修改失败';
}
array('status'=& gt;1)代表数据库中的admin表根据条件username='admin',查询出的所有结果status字段都自加1
六、删除的方法
1、
$count = Admin::model()->deleteAll('username=:nameandpassword=:pass',array(':name'=>'admin',':pass'=>'admin'));
$id=1,2,3
deleteAll('id in('.$id.')');删除id为这些的数据
if($count>0){
echo '删除成功';
}else{
echo '删除失败';
}
2、
$count = Admin::model()->deleteByPk(1);
$count =Admin::model()->deleteByPk(array(1,2),'username=:name',array(':name'=>'admin'));
if($count>0){
echo '删除成功';
}else{
echo '删除失败';
}
希望本文所述对大家基于Yii框架的PHP程序设计有所帮助。

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

PHPisusedforsendingemailsduetoitsbuilt-inmail()functionandsupportivelibrarieslikePHPMailerandSwiftMailer.1)Usethemail()functionforbasicemails,butithaslimitations.2)EmployPHPMailerforadvancedfeatureslikeHTMLemailsandattachments.3)Improvedeliverability

PHP performance bottlenecks can be solved through the following steps: 1) Use Xdebug or Blackfire for performance analysis to find out the problem; 2) Optimize database queries and use caches, such as APCu; 3) Use efficient functions such as array_filter to optimize array operations; 4) Configure OPcache for bytecode cache; 5) Optimize the front-end, such as reducing HTTP requests and optimizing pictures; 6) Continuously monitor and optimize performance. Through these methods, the performance of PHP applications can be significantly improved.

DependencyInjection(DI)inPHPisadesignpatternthatmanagesandreducesclassdependencies,enhancingcodemodularity,testability,andmaintainability.Itallowspassingdependencieslikedatabaseconnectionstoclassesasparameters,facilitatingeasiertestingandscalability.

CachingimprovesPHPperformancebystoringresultsofcomputationsorqueriesforquickretrieval,reducingserverloadandenhancingresponsetimes.Effectivestrategiesinclude:1)Opcodecaching,whichstorescompiledPHPscriptsinmemorytoskipcompilation;2)DatacachingusingMemc


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 English version
Recommended: Win version, supports code prompts!

Zend Studio 13.0.1
Powerful PHP integrated development environment

SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.

MantisBT
Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.

VSCode Windows 64-bit Download
A free and powerful IDE editor launched by Microsoft
