关于thinkphp5的数据库操作

$result = Db::execute('insert into log(user_id, ip) values(1, 11231)');
dump($result);
$result = Db::query('select * from log');
echo '<pre>';
var_dump($result);

$str = 'insert into log(user_id, ip) values(?, ?)';
$result = Db::execute($str, [1, '12312']);

$result = Db::query('select * from log where id = ?', [4]);

//占位符
Db::execute('insert into log(user_id, ip) values(:user_id, :ip)', ['user_id'=>12, 'ip'=>'5555']);

//添加：
Db::table('log')->insert(['user_id'=>1, 'ip'=>'654321']);

//更新
Db::table('log')
    ->where('id', 12)
    ->update(['user_id'=>123]);

//查询数据
$list = Db::table('log')
    ->where('id', 12)
    ->select();

//删除数据
Db::table('log')
    ->where('id', 10)
    ->delete();

Db::name('log')->insert(['user_id'=>44, 'ip'=>5555]);

//自动控制事物
Db::transaction(function (){
    Db::table('log')->delete(2);
    Db::table('log')->insert(['user_id'=>123]);
});

//手动控制事物的提交
//启动事物
Db::startTrans();
try {
    Db::table('log')
        ->where(2);
    Db::table('log')
        ->insert(['user_id' => 213]);
    Db::commit();
} catch (Exception $e){
    Db::rollback();
}