thinkphp的CURD和查询方式介绍_php技巧
对数据的读取 Read
$m=new Model('User');
$m=M('User');
select
$m->select();//获取所有数据,以数组形式返回
find
$m->find($id);//获取单条数据
getField(字段名)//获取一个具体的字段值
$arr=$m->where('id=2')->getField('username');
三、ThinkPHP 3 创建数据 (重点)
对数据的添加 Create
$m=new Model('User');
$m=M('User');
$m->字段名=值
$m->add();
返回值是新增的id号
四、ThinkPHP 3 删除数据 (重点)
$m=M('User');
$m->delete(2); //删除id为2的数据
$m->where('id=2')->delete(); //与上面效果相同,也是删除id为2的数据
返回值是受影响行数
五、ThinkPHP 3 更新数据 (重点)
$m=M('User');
$data['id']=1;
$data['username']='ztz2';
$m->save($data);
返回值是受影响行数
============================================
一、普通查询方式
二、表达式查询方式
三、区间查询
四、统计查询
五、SQL直接查询
一、普通查询方式
a、字符串
$arr=$m->where("sex=0 and username='gege'")->find();
b、数组
$data['sex']=0;
$data['username']='gege';
$arr=$m->where($data)->find();
注意:这种方式默认是and的关系,如果使用or关系,需要添加数组值
$data['sex']=0;
$data['username']='gege';
$data['_logic']='or';
二、表达式查询方式
$data['id']=array('lt',6);
$arr=$m->where($data)->select();
EQ 等于
NEQ不等于
GT 大于
EGT大于等于
LT 小于
ELT小于等于
LIKE 模糊查询
$data['username']=array('like','%ge');
$arr=$m->where($data)->select();
NOTLIKE
$data['username']=array('notlike','%ge%'); //notlike中间没有空格
$arr=$m->where($data)->select();
注意:如果一个字段要匹配多个通配符
$data['username']=array('like',array('%ge%','%2%','%五%'),'and');//如果没有第三个值,默认关系是or关系
$arr=$m->where($data)->select();
BETWEEN
$data['id']=array('between',array(5,7));
$arr=$m->where($data)->select();
//SELECT * FROM `tp_user` WHERE ( (`id` BETWEEN 5 AND 7 ) )
$data['id']=array('not between',array(5,7));//注意,not 和 between中间一定要有空格
$arr=$m->where($data)->select();
IN
$data['id']=array('in',array(4,6,7));
$arr=$m->where($data)->select();
//SELECT * FROM `tp_user` WHERE ( `id` IN (4,6,7) )
$data['id']=array('not in',array(4,6,7));
$arr=$m->where($data)->select();
//SELECT * FROM `tp_user` WHERE ( `id` NOT IN (4,6,7) )
三、区间查询
$data['id']=array(array('gt',4),array('lt',10));//默认关系是 and 的关系
//SELECT * FROM `tp_user` WHERE ( (`id` > 4) AND (`id`
$data['id']=array(array('gt',4),array('lt',10),'or') //关系就是or的关系
$data['name']=array(array('like','%2%'),array('like','%五%'),'gege','or');
四、统计查询
count //获取个数
max //获取最大数
min //获取最小数
avg //获取平均数
sum //获取总和
五、SQL直接查询
a、query 主要数处理读取数据的
成功返回数据的结果集
失败返回boolean false
$m=M();
$result=$m->query("select * from t_user where id >50");
var_dump($result);
b、execute 用于更新个写入操作
成功返回影响行数
失败返回boolean false
$m=M();
$result=$m->execute("insert into t_user(`username`) values('ztz3')");
var_dump($result);

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To run the ThinkPHP project, you need to: install Composer; use Composer to create the project; enter the project directory and execute php bin/console serve; visit http://localhost:8000 to view the welcome page.

ThinkPHP has multiple versions designed for different PHP versions. Major versions include 3.2, 5.0, 5.1, and 6.0, while minor versions are used to fix bugs and provide new features. The latest stable version is ThinkPHP 6.0.16. When choosing a version, consider the PHP version, feature requirements, and community support. It is recommended to use the latest stable version for best performance and support.

Steps to run ThinkPHP Framework locally: Download and unzip ThinkPHP Framework to a local directory. Create a virtual host (optional) pointing to the ThinkPHP root directory. Configure database connection parameters. Start the web server. Initialize the ThinkPHP application. Access the ThinkPHP application URL and run it.

Performance comparison of Laravel and ThinkPHP frameworks: ThinkPHP generally performs better than Laravel, focusing on optimization and caching. Laravel performs well, but for complex applications, ThinkPHP may be a better fit.

"Development Suggestions: How to Use the ThinkPHP Framework to Implement Asynchronous Tasks" With the rapid development of Internet technology, Web applications have increasingly higher requirements for handling a large number of concurrent requests and complex business logic. In order to improve system performance and user experience, developers often consider using asynchronous tasks to perform some time-consuming operations, such as sending emails, processing file uploads, generating reports, etc. In the field of PHP, the ThinkPHP framework, as a popular development framework, provides some convenient ways to implement asynchronous tasks.

ThinkPHP installation steps: Prepare PHP, Composer, and MySQL environments. Create projects using Composer. Install the ThinkPHP framework and dependencies. Configure database connection. Generate application code. Launch the application and visit http://localhost:8000.

ThinkPHP is a high-performance PHP framework with advantages such as caching mechanism, code optimization, parallel processing and database optimization. Official performance tests show that it can handle more than 10,000 requests per second and is widely used in large-scale websites and enterprise systems such as JD.com and Ctrip in actual applications.

Development suggestions: How to use the ThinkPHP framework for API development. With the continuous development of the Internet, the importance of API (Application Programming Interface) has become increasingly prominent. API is a bridge for communication between different applications. It can realize data sharing, function calling and other operations, and provides developers with a relatively simple and fast development method. As an excellent PHP development framework, the ThinkPHP framework is efficient, scalable and easy to use.
