php – Doctrine上的复杂SQL查询

我正在尝试使用Doctrine 2实现复杂的SQL查询.
但是,我的SQL查询有子选择.我认为这是’问题,但我无法实现解决这个问题的方法.

SELECT 
    x.year, x.month, y.total 
FROM
(SELECT 
     YEAR(a.date) year, MONTH(a.date) month, count(*) number
 FROM
     Acessos a
 GROUP BY
     YEAR(a.date), MONTH(a.date)) x 

INNER JOIN

(SELECT
 MAX(Z.number) total
 FROM
 (SELECT
      COUNT(a.id) number
  FROM
      Acessos a
  GROUP BY
      YEAR(a.date), MONTH(a.date)) z) y ON x.number = y.total LIMIT 1

当我把这个查询运行到trhu代码时,我得到一个QueryException.

<b>Fatal error</b>:  Uncaught exception 'DoctrineORMQueryQueryException' 
with message 'SELECT x.messelecionado, x.anoselecionado, y.total from (select
month(a.data) messelecionado, year(a.data) anoselecionado, count(*) numero from 
Acesso a group by month(a.data), year(a.data)) x inner join (select max(z.numero)
total from (select count(a.id) numero from Acesso a group by month(a.data),
year(a.data)) z) y on x.numero = y.total limit 1' in     
C:xampphtdocspatclinappDoctrineORMQueryQueryException.PHP:39
Stack trace:
#0 C:xampphtdocspatclinappDoctrineORMQueryParser.PHP(429):   
DoctrineORMQueryQueryException::dqlError('SELECT x.messel...')
#1 C:xampphtdocspatclinappDoctrineORMQueryParser.PHP(854):     
DoctrineORMQueryParser-&gt;semanticalError('Class '(' is no...', Array)
#2 C:xampphtdocspatclinappDoctrineORMQueryParser.PHP(1529): 
DoctrineORMQueryParser-&gt;AbstractSchemaName()
#3 C:xampphtdocspatclinappDoctrineORMQueryParser.PHP(1426): 
DoctrineORMQueryParser-&gt;RangeVariableDeclaration()
#4 C:x in <b>C:xampphtdocspatclinappDoctrineORMQueryQueryException.PHP</b> 
on line <b>49</b><br />

谁知道我该怎么办？

谢谢！！！

解决方法:

您使用group by子句编写的YEAR函数不会被学说理解.你必须为此注册自定义dql函数.
这是doctrine提供的dql函数列表：
http://docs.doctrine-project.org/en/latest/reference/dql-doctrine-query-language.html#dql-functions

这是创建自己的dql函数的链接
http://docs.doctrine-project.org/en/latest/reference/dql-doctrine-query-language.html#adding-your-own-functions-to-the-dql-language

groupby也只使用聚合函数(AVG,COUNT,MIN,MAX,SUM)

此链接可能对您有所帮助
Group by using month, year in doctrine2

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