Question

有没有办法让一个列表按两个字段排序，比如姓和名？

我知道.listOrderByLastAndFirst和.list(sort:'last, first')无效。

Answer 1

Hates_标准答案对我来说似乎不起作用;将"last,first"按顺序排列只会导致异常"Property 'last,first' not found"。要在两个字段上订购，您可以执行以下操作：

def c = MyDomain.createCriteria()
def results = c.list {
    and{
       order('last','desc')
       order('first','desc')
    }
}

Answer 2

这已经很老了，但帮助我找到了合适的解决方案。使用withCriteria快捷方式的“更干净”的代码示例：

def c = MyDomain.withCriteria {
    and {
        order('last', 'desc')
        order('first', 'desc')
    }
}

Answer 3

此旧解决方案不再有效。请参阅下面的mattlary答案

您可能必须在HQL中编写自定义查找程序或使用Criteria Builder。

MyDomain.find("from Domain as d order by last,first desc")

或者

def c = MyDomain.createCriteria()
def results = c.list {
       order("last,first", "desc")
}

Answer 4

更复杂的订购标准，（在Grails 2.1.0中测试）

def c = MyDomain.withCriteria {
    property {
        order('last', 'desc')
    }
    order('first', 'desc')
}

首先通过MyDomain.property.last然后通过MyDomain.first

进行排序

Answer 5

此查询在第一个字段的基础上工作。当第一个字段为空时，它会被第二个字段缩短。

order('last','desc')
order('first','desc')

Answer 6

我认为一个标准是最好的选择，但是你通过首先尝试查找器做了正确的事情。从GORM检索域对象时，尝试的正确顺序是：动态查找器，条件，HQL。

Answer 7

你可以这样做

def results=MyDomain.findAll([sort:"last",order:'desc'],[sort:"first",order:'desc']);

这行代码将首先按照姓氏对域类“MyDomain”的结果进行排序，然后按人员的名字对结果进行排序。

Answer 8

MyDomain.findAll(sort: ['first': 'desc','last':'desc'])

适用于grails-datastore-gorm：6.0.3

Answer 9

如果要对其项目内容进行排序，则需要实现一个比较器，该比较器具有一些智能，可以根据多个属性决定排序顺序。

Groovy式比较器的一些示例显示为here

但是，如果您正在从数据库查询返回正在排序的列表，那么最好使用CrteriaQuery对其进行排序并对其进行排序

Answer 10

我有同样的问题。由于我的列表不是很大，因此我使用常规排序，因为我想对链接域的字段进行排序： CalendarData->景点

Private WithEvents ZVX_IF As VIF            'Public command_s As String

Private Sub CommandButton1_Click()

Const NUM_REPS As Long = 2          'works as expexted
Dim freq As Variant, i As Long           'the i works as expexted
Dim Buffer As String
Dim Index As Integer
Dim Trace, Stim As Variant
Dim dt As String





Set ZVX_IF = New VIF

Tabelle3.Range("B2").Value = "---"

'clear previous data
Range("A4:C4").Select
Range(Selection, Selection.End(xlDown)).Select
Selection.ClearContents

command_s = Space(20)
freq = 15.005005            'set as primary frequency


With ZVX_IF
If .OpenDevice(Tabelle3.Range("B1").Value) = True Then
    .ReadString "*IDN?", Buffer: Tabelle3.Range("B2").Value = Buffer 'read out 
instrument type
    .WriteString ":FORMat:DATA REAL"                            'set transfer to real 
format (speed)
    .ReadString ":INSTrument:PORT:COUNt?", Buffer: Tabelle3.Range("C2").Value = 
Buffer ' detect no of ports
    If Buffer = "2" Then

    .WriteString command_y                              'set measured quantity to Sxx
    .WriteString ":CALCulate1:FORMat REAL"              'set format to real
    .WriteString ":INITiate1:CONTinuous OFF"            'set single sweep

    For i = 1 To NUM_REPS           'works as expexted







    'ENTER YOUR HARMONIC
    'Center the analyzer on a harmonic
    .WriteString "FREQ:CENT " & freq & " MHz"
    'Set Span to
    .WriteString "FREQ:SPAN 912 kHz"
    'now memorize current timer value
    t = Timer()
    'display current time
    Tabelle3.Range("I16").Value = Now
    '___________________________________
    'start one sweep and wait for completion
    .WriteString ":INITiate1:IMMediate;*WAI"                    'launch single sweep 
and wait to finish
    'get stimulus data
    .ReadFloatArray "TRAC:STIM? CH1DATA", Stim                  ' get stimulus data
    'write stimulus values to sheet
    For Index = LBound(Stim) To UBound(Stim)
        Tabelle3.Range("A4").Offset(Index, 0).Value = Stim(Index) / 1000000000#
    Next Index

    '______________________________________
    'now get trace data
    .ReadFloatArray ":TRACe? CH1Data", Trace                    'get all of channel 1 
data
    'show elapsed timer value on sheet
    Tabelle3.Range("I44").Value = (Timer() - t) * 1000
    'write data to worksheet
    For Index = LBound(Trace) To UBound(Trace) Step 2
        Tabelle3.Range("B4").Offset(Index / 2, 0).Value = Trace(Index)
        Tabelle3.Range("C4").Offset(Index / 2, 0).Value = Trace(Index + 1)
    Next Index


    freq = freq + 10  



    'Save the workbook and Enter the Name you want it saved as
    dt = Format(CStr(Now), "yyyy_mm_dd_hh_mm_ss")
    ActiveWorkbook.SaveAs FileName:="C:\Users\Profesor Xavier\Desktop\ZHU\Data 
 run\_Test_loop_" & dt & ".xls", FileFormat:=56

    Next i          'works as expexted


    Else
            Get_Spara16.Show '4-port instrument
    End If
Else
    Tabelle3.Range("B2").Value = "INSTRUMENT NOT FOUND"
End If
End With

End Sub

如何在Grails的多个字段中订购？

10 个答案: