array(
  'components' => array(
    //自定義數(shù)據(jù)庫(kù)操作組件
    'dbOper'  => array(
      'class'   => 'app\components\DbOper\realization\DbRealization1'
    ),
    //Yii 框架數(shù)據(jù)庫(kù)連接組件
    'db'      =>  array(
        'class'     => 'yii\db\Connection',
        'dsn'      => 'mysql:host=localhost;dbname=yii',
        'username'   => 'root',
        'password'   => '123456',
        'charset'    => 'utf8'
      );
  )
)

<?php
namespace app\components\DbOper;
/**
 * 自定義數(shù)據(jù)庫(kù)操作組件 依賴系統(tǒng)定義組件db
 */
interface DbOper
{
  /**
   * 查詢多條數(shù)據(jù)
   * @param
   * String $sql 需要查詢的sql語句
   * array $keyVal 字段映射
   * @return
   * array 查詢結(jié)果
   */
  public function fetchAll($sql='',$keyVal=array());
  /**
   * 查詢一條數(shù)據(jù) 原生sql
   * @param
   * String $sql 需要查詢的sql語句
   * array $keyVal 字段映射
   * @return
   * array 查詢結(jié)果
   */
  public function fetch($sql='',$keyVal=array());
  /**
   * 添加數(shù)據(jù)
   * @param
   * String $tableName 表名
   * array $values 要插入的數(shù)據(jù)
   * @return
   * int 受影響的行數(shù)
   */
  public function insert($tableName='',$values=array());
  /**
   * 更新數(shù)據(jù)
   * @param
   * String $tableName 表名
   * array | String $where 修改條件 為 1 時(shí)更改該表所有的行
   * array $update 要更新的數(shù)據(jù) 
   * @return
   * int 受影響的行數(shù)
   */
  public function update($tableName='',$where='',$update=array());
  /**
   * 刪除數(shù)據(jù)
   * @param
   * String $tableName 表名
   * array | String $where 刪除條件
   * @return
   * int 受影響的行數(shù)
   */
  public function delete($tableName='',$where='');
  /**
   * 事務(wù)處理
   * @param
   * array $sqls 要執(zhí)行的sql集合
   * return
   * boolean 是否執(zhí)行成功
   */
  public function transcation($sqls = array());
  /**
   * 獲得數(shù)據(jù)庫(kù)鏈接
   */
  public function getYiiDbConnection();
}

<?php
namespace app\components\DbOper\realization;
use Yii;
use app\components\DbOper\DbOper;
/**
 * 自定義數(shù)據(jù)庫(kù)操作組件實(shí)現(xiàn)類
 */
class DbRealization1 implements DbOper
{
  private $db = null;
  /**
   * interface @Override
   */
  public function fetchAll($sql='',$keyVal=array())
  {
    if($sql === '')
      return array();
    $result = $this->getQueryObj($sql,$keyVal)->queryAll();
    if($result)
      return $result;
    else
      return array();
  }
  /**
   * interface @Override
   */
  public function fetch($sql='',$keyVal=array())
  {
    if($sql === '')
      return array();
    $result = $this->getQueryObj($sql,$keyVal)->queryOne();
    if($result)
      return $result;
    else
      return array();
  }
  /**
   * interface @Override
   */
  public function insert($tableName='',$values=array())
  {
    if($tableName === '')
      return 0;
    $insert = $this->getYiiDbConnection()->createCommand();
    if(is_array($values[0]))
    {
      $keys = array_keys($values[0]);
      return $insert->batchInsert($tableName,$keys,$values)->execute();
    }
    return $insert->insert($tableName,$values)->execute();
  }
  /**
   * interface @Override
   */
  public function update($tableName='',$where = '',$update=array())
  {
    if($tableName === '')
      return 0;
    if($where === '')
      return 0;
    return $this->getYiiDbConnection()
        ->createCommand()
        ->update($tableName,$update,$where)
        ->execute();
  }
  /**
   * interface @Override
   */
  public function delete($tableName='',$where='')
  {
    if($tableName === '')
      return 0;
    return $this->getYiiDbConnection()
        ->createCommand()
        ->delete($tableName,$where)
        ->execute();
  }
  /**
   * 獲得查詢操作對(duì)象
   * @return 
   * Object 
   */
  private function getQueryObj($sql='',$keyVal=array())
  {
    $query = $this->getYiiDbConnection()->createCommand($sql);
    if(!empty($keyVal))
      $query->bindValues($keyVal);
    return $query;
  }
  /**
   * interface @Override
   */
  public function transcation($sqls = array())
  {
    if(empty($sqls))
      return false;
    $db = $this->getYiiDbConnection();
    $outerTransaction = $db->beginTransaction();
    $runClient = true;
    try
    {
      foreach($sqls as $sql)
      {
        $db->createCommand($sql)->execute();
      }
      $outerTransaction->commit();
    }catch(\Exception $e){
      $runClient = false;
      $outerTransaction->rollback();
    }
    return $runClient;
  }
  /**
   * interface @Override
   */
  public function getYiiDbConnection()
  {
    if($this->db === null)
    {
      $this->db = Yii::$app->db;
    }
    return $this->db;
  }
}