如何在 Yii $criteria 中使用 DATE_ADD? [英] How use DATE_ADD in Yii $criteria?

问题描述

模型.php

// Declare $datetime_limit
public datetime_limit;

控制器.php

// datetime_limit should be the actual datetime + 5 days
$criteria->select="DATE_ADD(NOW(), INTERVAL 5 DAY) AS datetime_limit";

错误信息:

Active record "Users" is trying to select an invalid column "DATE_ADD(NOW()". Note, the column must exist in the table or be an expression with alias.

<小时>

编辑 1:

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Edit 1:

我想使用关系表(多对多)过滤带有条件的查找.所以 datetime_limit 在关系 events.datetime 中不能有.我该怎么做?

I would like to filter the find w/ a condition using a relation table (Many to Many). So the datetime_limit cannot have in relational events.datetime. How can I do that?

$criteria->select=array("DATE_ADD(NOW(), INTERVAL 5 DAY) AS datetime_limit");
$criteria->with=array('events');
$criteria->having='datetime_limit!=`events`.`datetime`';
$models=Users::model()->findAll($criteria);

推荐答案

CActiveFinder::getColumnSelect.

当 CDbCriteria::$select 是一个字符串时，它被视为一个简单的逗号分隔列列表.您的表达式被解释为两个不同的列.您可以通过自己将 select 设置为数组来解决此问题 - 在这种情况下，逗号拆分未完成¹:

When CDbCriteria::$select is a string, it's treated as a simple list of comma-delimited columns. Your expression gets interpreted as two distinct columns. You can work around this by setting select to an array yourself - in this case the comma splitting is not done¹:

$criteria = new CDbCriteria();
$criteria->select = array("DATE_ADD(NOW(), INTERVAL 5 DAY) AS datetime_limit");
$models = Users::model()->findAll($criteria);

请注意，如果您编写的别名与公共模型属性或数据库字段不对应，它将被检索但会被静默忽略 - 由于某种原因 Yii 不会为此抛出异常.

Note that if you write an alias that doesn't correspond to a public model property or a DB field, it will be retrieved but silently ignored - for some reason Yii doesn't throw an exception for that.

¹ 但是，此函数仍会尝试在表达式中查找 . 并将其后的部分解释为列标识符 - 不要使用 . 在你的表达中，你应该没问题.

¹ However, this function will still attempt to find a . in the expression and interpret the part after it as a column identifier - don't use . in your expression and you should be fine.

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