Yii框架数据库查询、增加、删除操作示例

<?php
namespace app\models;
use yii\db\ActiveRecord;
class Test extends ActiveRecord{
}

  public function actionTest(){
    //方法一
    $sql = 'select * from test where id=:id';
    $data = Test::findBySql($sql,array(':id'=>1))->all();
    var_dump($data);//数组
    //方法二
    $data = Test::find()->where(['id'=>1])->all();
    var_dump($data);//复杂的对象信息
    // 查询条件>的使用
    $data = Test::find()->where(['>','id',1])->all();
    var_dump($data);//复杂的对象信息
    // 查询条件 between 的使用
    $data = Test::find()->where(['between','id',2,5])->all();
    var_dump($data);//复杂的对象信息
    // 查询条件 like 的使用
    $data = Test::find()->where(['like','title','title1'])->all();
    var_dump($data);//复杂的对象信息
    //查询结果对象转化为数组,使用asArray
    $data = Test::find()->where(['between','id',2,5])->asArray()->all();
    var_dump($data);//复杂的对象信息
    //批量查询,例如每次获取2条
    $data = array();
    foreach(Test::find()->asArray()->batch(2) as $tests){
      foreach($tests as $val){
        $data[] = $val;
      }
    }
    print_r($data);
  }

<?php
namespace app\models;
use yii\db\ActiveRecord;
class Test extends ActiveRecord{
  public function rules()
  {
    return [
      ['title','string','length'=>[0,10]]
    ];
  }
}

  public function actionTest(){
    //添加数据
    $test = new Test;
    $test->title = '';
    $test->validate();
    if ($test->hasErrors()) {
      echo 'error';
    } else {
      $test->save();
    }
  }

 public function actionTest(){
    //删除
    //方法一
    $result = Test::find()->where(['id' => 1])->all();
    $result[0]->delete();
    //方法二
    Test::deleteAll('id>:id', array(':id' => 5));
  }