Question

CakePHP 3.6.14

此代码复制了错误的数字：

        $where = [
            'Postings.source' => $source,
            'Postings.approved' => 1,
            'Postings.deleted' => 0,
            'Postings.disabled' => 0
        ];

        if ($source !== null) {
            $where['Postings.created >='] = '(NOW() - INTERVAL 3 DAY)';
        }
        $count = $this->Postings
            ->find()
            ->where($where)
            ->count();
        debug($count); exit;

       // 77568 total of all records
########## DEBUG ##########
[
    'Postings.source' => 'xzy',
    'Postings.approved' => (int) 1,
    'Postings.deleted' => (int) 0,
    'Postings.disabled' => (int) 0,
    'Postings.created >=' => '(NOW() - INTERVAL 3 DAY)'
]

//SQL produced by this query:

SELECT (COUNT(*)) AS `count` 
FROM postings Postings 
WHERE (
   Postings.source = 'xzy' 
   AND Postings.approved = 1 
   AND Postings.deleted = 0 
   AND Postings.disabled = 0 
   AND Postings.created >= '(NOW() - INTERVAL 3 DAY)' // <<<< with quotes
)

但原始sql查询：

SELECT COUNT(*) as `count
FROM `postings` 
WHERE `source` = 'xzy' 
AND `approved` = 1 
AND `deleted` = 0 
AND `disabled` = 0 
AND `created` >= (NOW() - INTERVAL 3 DAY) // <<< without quotes
// return correct num 2119

如何解决？

Answer 1

key => value条件右侧的值始终受绑定/强制转换/转义的约束，除非它是一个表达式对象。查看生成的查询，您的SQL代码段将最终以字符串文字形式出现，即：

created >= '(NOW() - INTERVAL 3 DAY)'

长话短说，请使用一个表达式，可以是原始表达式：

$where['Postings.created >='] = $this->Postings->query()->newExpr('NOW() - INTERVAL 3 DAY');

或使用功能生成器：

$builder = $this->Postings->query()->func();
$where['Postings.created >='] = $builder->dateAdd($builder->now(), -3, 'DAY');

另请参见

Answer 2

您应该使用查询构建器并将其添加到def stuff = udf[Vector, Vector, Vector]((v1,v2) => { Vectors.dense(v1.toDense.values.zip(v2.toDense.values) .map{case (a,b) => a+b}) .toSparse }) test.groupBy("id").agg(stuff($"stuff")).show java.lang.ClassCastException: $anonfun$stuff$1 cannot be cast to scala.Function1 at org.apache.spark.sql.catalyst.expressions.ScalaUDF.<init>(ScalaUDF.scala:98) at org.apache.spark.sql.expressions.UserDefinedFunction.apply(UserDefinedFunction.scala:71) ... 87 elided方法select函数中。

此处描述了所有内容：https://book.cakephp.org/3.0/en/orm/query-builder.html#using-sql-functions

CakePHP count（）返回错误结果？

2 个答案: