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1. Configuration file directory tp5\application\database.php
Connect through the configuration file. It can also be linked via methods.
The method in the controller is used to connect to the database; the query writing method is slightly different from the system DB class method.
// 使用方法配置数据库连接
public function data1 ()
{
$DB = Db::connect([
// 数据库类型
'type' => 'mysql',
// 服务器地址
'hostname' => '127.0.0.1',
// 数据库名
'database' => 'user',
// 用户名
'username' => 'root',
// 密码
'password' => 'root',
// 端口
'hostport' => '3306',
]);
// dump($DB);
// 查询数据，，，，和使用系统的DB类方法略有差异
$data = $DB -> table("uu") -> select();
dump($data);
}(recommended learning tutorial: thinkphp tutorial)
2. Basic usage, addition, deletion, modification and query
The controller uses the configuration file to connect to the database
The file under the controller (tp5\application\index\controller\Index.php )Write
<?php
namespace app\index\controller;
use think\Db;
use think\Controller;
class Index extends Controller
{
public function index()
{
// return '上课来';
return $this -> fetch();
}
// 使用配置文件连接数据库
public function data()
{
// 实例化数据库系统类
$DB = new Db;
// 查询数据，表名为uu的所有数据
$data = $DB::table("uu") -> select();
// 使用sql语句
//$data = $DB::query("select * from uu");
dump($data);
}
}3. Render the data to the template page
<?php
namespace app\index\controller;
use think\Db;
use think\Controller;
// 使用model连接数据库要引入moadel
use think\Model;
class Index extends Controller
{
public function index()
{
// return 's';
$this -> data();
return $this -> fetch();
}
// 使用系统配置文件连接数据库
public function data()
{
// 实例化数据库系统类
$DB = new Db;
// 查询数据
$data = $DB::table("uu") -> select();
$this -> assign("user",$data);
// dump($data);
}
}4. The template page can reference the rendering data
tp5\application\index\view\index\index .html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>s</title>
</head>
<body>
<div> s</div>
{volist name="user" id="vo"}
<a href="">{$vo.name}</a>
{/volist}
</body>
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