ThinkPHP5.1的數據庫鏈接和增刪改查

一、數據庫的鏈接方式


<?php
namespace app\index\controller;
use think\Db;


class Demo
{
//1、全局配置 config/database.php配置
public function dbTest()
{
return Db::table('pzq_article')
->where('id','29')
->value('title');
}


//2、動態配置 think\db\Query.php中有一個方法connect()
public function dbTest2()
{
return Db::connect([
'type'=>'mysql',
'hostname'=>'localhost',
'database'=>'top789',
'username'=>'root',
'password'=>'root',
])
->table('pzq_article')
->where('id','76')
->value('title');
}


//3、DSN連接
public function dbTest3()
{
$dsn = 'mysql://root:root@localhost:3306/top789#utf8';
return Db::connect($dsn)
->table('pzq_article')
->where('id','88')
->value('title');
}


//4、單條查旬
public function dbTest4()
{
$res = Db::table('pzq_article')
->field(['title'=>'標題','id'=>'編號'])//可添加別名
->where('id','=',20)//如果是等號，=可以省略
->find();//如果是主鍵查詢，可省略上面where,這行寫->find(20);
dump(is_null($res)?'沒有查到':$res);
}
//5、多條查旬
public function dbTest5()
{
$res = Db::table('pzq_article')
->field(['id','cat_id','title'])
->where([
['id','>',20],
['cat_id','=',2],
])//一個條件，直接用表達式->where('id','>',20)。多個條件用數組
->order('id desc')->limit(3)->select();


if(empty($res)){
return '沒有查到';
}else{
dump($res);
}


}


//6、數據添加
public function dbTest6()
{
$data = [
'name'=>'Sam2',
'age'=>'29',
'posttime'=>time()
];
$dataall=[
['name'=>'Sam3','age'=>'29','posttime'=>time()],
['name'=>'Sam4','age'=>'30','posttime'=>time()],
];
//(1)單條插入
//return Db::table('test')->data($data)->insert();
//(2)插入同時返回新增主鍵id
//return Db::table('test')->insertGetId($data);
//(3)插入多條數據
return Db::table('test')->data($dataall)->insertAll();
}
//更新數據
public function dbTest7()
{
// return Db::table('test')
// ->where('id','=',4)
// ->update(['name'=>'SamC','age'=>'31']);
//如果where條件是主鍵，還可以如下使用
return Db::table('test')
->update(['name'=>'SamCheng','age'=>'30','id'=>4]);
}
//刪除操作
public function dbTest8()
{
//return Db::table('test')->delete(6);
//或者
return Db::table('test')->where('id',5)->delete();
}
//mysql原生語句 查詢
public function dbTest9()
{
$sql = "select name,age from test where id>2";
dump(Db::query($sql));
}
//mysql 增、刪、改 用Db::execute($sql)
public function dbTest10()
{
//$sql = "update test set name='samC' where id=4";
//$sql = "insert test set name='Yan',age='30'";
$sql = "delete from test where id=4";
return Db::execute($sql);
}


}