php - Yii1 : How to use concat function in mysq like query

Question

我想在 like 表达式 中使用 Mysql Concat 函数。
我想将firstname和lastname合并为fullname，根据fullname得到匹配的结果。
我已经在 YII1 中尝试过了。下面是我的代码:

    $criteria = new CDbCriteria();
    $criteria->select = "*";
    $criteria->select = 'CONCAT(firstname , "" ,  lastname) AS fullname';
    $criteria->addCondition('fullname LIKE :match');
    $criteria->params = array(':match' => $query);
    $models = User::model()->findAll($criteria);

下面是生成的错误信息:

CDbCommand failed to execute the SQL statement: SQLSTATE[42S22]: Column not found: 1054 Unknown column 'fullname' in 'where clause'
(Error 500)
    CDbCommand::fetchColumn() failed: SQLSTATE[42S22]: Column not found: 1054
Unknown column 'fullname' in 'where clause'. The SQL statement executed
was: SELECT COUNT(*) FROM `members` `t` WHERE fullname LIKE :match.

提前致谢

Answer 1

如果以后不需要全名，可以在WHERE子句中使用CONCAT方法:

$criteria = new CDbCriteria();
$criteria->addCondition('CONCAT(userId , " " , username) LIKE :match');
$criteria->params = array(':match' => $query);
$models = User::model()->findAll($criteria);

但是，如果您确实想在 SELECT 子句中保留全名，则只能在 HAVING 子句中使用此别名:

$criteria = new CDbCriteria();
$criteria->select = '*, CONCAT(userId , " " , username) AS fullname';
$criteria->having = 'fullname LIKE :match';
$criteria->params = array(':match' => $query);
$models = User::model()->findAll($criteria);

请注意，在这种情况下，您的用户模型应该具有全名属性，否则您将无法访问全名字段。