YII框架批量插入数据的方法

public function insertSeveral($table, $array_columns){ $sql = ''; $params = array(); $i = 0; foreach ($array_columns as $columns) {  $names = array();  $placeholders = array();  foreach ($columns as $name => $value) {   if (!$i) {    $names[] = $this->_connection->quoteColumnName($name);   }   if ($value instanceof CDbExpression) {    $placeholders[] = $value->expression;    foreach ($value->params as $n => $v)     $params[$n] = $v;   } else {    $placeholders[] = ':' . $name . $i;    $params[':' . $name . $i] = $value;   }  }  if (!$i) {   $sql = 'INSERT INTO ' . $this->_connection->quoteTableName($table)    . ' (' . implode(', ', $names) . ') VALUES ('    . implode(', ', $placeholders) . ')';  } else {   $sql .= ',(' . implode(', ', $placeholders) . ')';  }  $i++; } return $this->setText($sql)->execute($params);}$rows = array(   array('id' => 1, 'name' => 'John'),   array('id' => 2, 'name' => 'Mark'));$command = Yii::app()->db->createCommand();$command->insertSeveral('users', $rows);