Question

我有一个域类（缩小）为： -

class Expense {
    Date dateOfExpense
    int amount
}

我试图获得按周/月/费用日期分组的金额总和。参考grails doc http://grails.org/doc/latest/guide/GORM.html中的'sqlGroupProjection'方法，

我尝试使用以下代码： -

def results = c {
    between("dateOfExpense", fromDate, toDate)              
    projections {
         sqlGroupProjection 'dateOfExpense,sum(amount) as summed',       
        'MONTH(dateOfExpense)',['date','summed'],[DATE,NUMBER]                  
    }
}

抛出异常：

 No such property: DATE for class: grails.orm.HibernateCriteriaBuilder. Stacktrace follows:
 Message: No such property: DATE for class: grails.orm.HibernateCriteriaBuilder

请使用sqlGroupProjection方法

建议一种方法

Answer 1

在域类中为每周，每月和每年创建三个新的数字字段。这些字段不会映射到表中的列。

为这三个字段提供静态映射。

static mapping = {
     //provide the exact column name of the date field
     week formula('WEEK(DATE_OF_EXPENSE)')    
     month formula('MONTH(DATE_OF_EXPENSE)')
     year formula ('YEAR(DATE_OF_EXPENSE)')
}

现在我们可以使用

def results = c.list {
  between("dateOfExpense", fromDate, toDate) 
  projections {
    switch(groupBy){
        case "week":
           groupProperty('year')
           groupProperty('month')
           groupProperty('week') 
        break;
        case "month"
           groupProperty('year')
           groupProperty('month')
        break;
        case "year":
           groupProperty('year')
        break;
    }        
    sum('amount')
  }
}

Answer 2

而不是这个

static mapping = {

week formula('WEEK(DATE_OF_EXPENSE)')    //provide the exact column name of the date field
month formula('MONTH(DATE_OF_EXPENSE)')
year formula ('YEAR(DATE_OF_EXPENSE)')

}

试试这个

static mapping = {

week formula: 'WEEK(DATE)'    
month formula: 'MONTH(DATE)'
year formula: 'YEAR(DATE)'

}

Answer 3

尝试类似

的内容

sqlGroupProjection 'MONTH(dateOfExpense) as month, sum(amount) as summed',
    'month',['month','summed'],[NUMBER,NUMBER]

Answer 4

此sqlGroupProjection方法似乎支持不足。使用

def results = c.list {
    between("dateOfExpense", fromDate, toDate) 
    projections {
        groupProperty('dateOfExpense')
        sum('amount')
    }
}

将产生应得的结果。

如果您希望在截止日期前分组，请参阅Grails group by date（实际上，这完全超出了我的答案。但是我在长时间尝试您的代码后达到了相同的解决方案。）

在GORM中按周/月/年分组

4 个答案: