DCount与SQL SELECT COUNT(*)？

Question

我正在尝试根据分配给供应商的采购订单来获取发送给供应商的所有项目的计数。但是我似乎不能让控件根据purchase order实例显示许多商品--它总是抛出一个#name？或者#error！激活表单时在文本框中显示消息。

tblPODetail的Create语句

USE [instkeeper_test]
GO


SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO

CREATE TABLE [dbo].[tblPODetail](
    [intPurchaseOrderInstance] [int] IDENTITY(1,1) NOT NULL,
    [intPONumber] [int] NOT NULL,
    [datDateEntered] [datetime] NOT NULL,
    [bolPOOpen] [bit] NOT NULL,
    [intRMANumber] [nvarchar](255) NULL,
    [strSupplierCode] [nvarchar](50) NOT NULL,
    [strSupplierLastAddress] [nvarchar](50) NULL,
    [strSupplierLastCity] [nvarchar](50) NULL,
    [strSupplierLastState] [nvarchar](50) NULL,
    [strSupplierLastPostalCode] [nvarchar](50) NULL,
    [strSupplierLastCountry] [nvarchar](50) NULL,
    [strSupplierLastPhone] [nvarchar](50) NULL,
    [strSupplierLastFax] [nvarchar](50) NULL,
    [datDateSent] [datetime] NULL,
    [datDateReceived] [datetime] NULL,
    [bolAdvGageTrakNoTouch] [bit] NOT NULL,
    [bolAdvHardCopies] [bit] NOT NULL,
    [bolFreightShip] [bit] NOT NULL,
    [bolReturnableUsed] [bit] NOT NULL,
    [bolInHouse] [bit] NOT NULL,
    [strUPSTrackNumOut] [nvarchar](255) NULL,
    [strFedExTrackNumOut] [nvarchar](255) NULL,
    [strFreightTrackNumOut] [nvarchar](255) NULL,
    [strUPSTrackNumIn] [nvarchar](255) NULL,
    [strFedExTrackNumIn] [nvarchar](255) NULL,
    [strFreightTrackNumIn] [nvarchar](255) NULL,
    [SSMA_TimeStamp] [timestamp] NOT NULL
) ON [PRIMARY]

GO

ALTER TABLE [dbo].[tblPODetail]  WITH CHECK ADD  CONSTRAINT [SSMA_CC$tblPODetail$strSupplierCode$disallow_zero_length] CHECK  ((len([strSupplierCode])>(0)))
GO

ALTER TABLE [dbo].[tblPODetail] CHECK CONSTRAINT [SSMA_CC$tblPODetail$strSupplierCode$disallow_zero_length]
GO

ALTER TABLE [dbo].[tblPODetail] ADD  CONSTRAINT [DF__tblPODeta__intPO__6C190EBB]  DEFAULT ((0)) FOR [intPONumber]
GO

ALTER TABLE [dbo].[tblPODetail] ADD  CONSTRAINT [DF__tblPODeta__datDa__6D0D32F4]  DEFAULT (getdate()) FOR [datDateEntered]
GO

ALTER TABLE [dbo].[tblPODetail] ADD  CONSTRAINT [DF__tblPODeta__bolPO__6E01572D]  DEFAULT ((1)) FOR [bolPOOpen]
GO

ALTER TABLE [dbo].[tblPODetail] ADD  CONSTRAINT [DF__tblPODeta__bolAd__6EF57B66]  DEFAULT ((1)) FOR [bolAdvGageTrakNoTouch]
GO

ALTER TABLE [dbo].[tblPODetail] ADD  CONSTRAINT [DF__tblPODeta__bolAd__6FE99F9F]  DEFAULT ((1)) FOR [bolAdvHardCopies]
GO

ALTER TABLE [dbo].[tblPODetail] ADD  CONSTRAINT [DF__tblPODeta__bolFr__70DDC3D8]  DEFAULT ((0)) FOR [bolFreightShip]
GO

ALTER TABLE [dbo].[tblPODetail] ADD  CONSTRAINT [DF__tblPODeta__bolRe__71D1E811]  DEFAULT ((0)) FOR [bolReturnableUsed]
GO

ALTER TABLE [dbo].[tblPODetail] ADD  CONSTRAINT [DF__tblPODeta__bolIn__72C60C4A]  DEFAULT ((0)) FOR [bolInHouse]
GO

tblPOGaugeDetail的Create语句

USE [instkeeper_test]
GO


SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO

CREATE TABLE [dbo].[tblPOGaugeDetail](
    [intItemPOID] [int] IDENTITY(1,1) NOT NULL,
    [intGagePOID] [int] NOT NULL,
    [strGageDetailID] [nvarchar](50) NULL,
    [datGageSent] [datetime] NULL,
    [datGageReceived] [datetime] NULL,
    [bolGageCalibrate] [bit] NOT NULL,
    [bolGageRepair] [bit] NOT NULL,
    [bolGageEvaluate] [bit] NOT NULL,
    [bolGageAccredited] [bit] NOT NULL,
    [bolGageReturned] [bit] NOT NULL,
    [bolGageException] [bit] NOT NULL,
    [bolGageExceptResolved] [bit] NOT NULL,
    [bolGageLeavePriceBlank] [bit] NOT NULL,
    [intGageCost] [real] NULL,
    [intTurnaroundDaysOut] [int] NULL,
    [SSMA_TimeStamp] [timestamp] NOT NULL,
 CONSTRAINT [tblPOGaugeDetail$PrimaryKey] PRIMARY KEY CLUSTERED 
(
    [intItemPOID] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]

GO

ALTER TABLE [dbo].[tblPOGaugeDetail]  WITH CHECK ADD  CONSTRAINT [tblPOGaugeDetail$tblPODetailtblPOGaugeDetail] FOREIGN KEY([intGagePOID])
REFERENCES [dbo].[tblPODetail] ([intPurchaseOrderInstance])
ON UPDATE CASCADE
GO

ALTER TABLE [dbo].[tblPOGaugeDetail] CHECK CONSTRAINT [tblPOGaugeDetail$tblPODetailtblPOGaugeDetail]
GO

ALTER TABLE [dbo].[tblPOGaugeDetail] ADD  DEFAULT ((0)) FOR [intGagePOID]
GO

ALTER TABLE [dbo].[tblPOGaugeDetail] ADD  DEFAULT ((1)) FOR [bolGageCalibrate]
GO

ALTER TABLE [dbo].[tblPOGaugeDetail] ADD  DEFAULT ((0)) FOR [bolGageRepair]
GO

ALTER TABLE [dbo].[tblPOGaugeDetail] ADD  DEFAULT ((0)) FOR [bolGageEvaluate]
GO

ALTER TABLE [dbo].[tblPOGaugeDetail] ADD  DEFAULT ((0)) FOR [bolGageAccredited]
GO

ALTER TABLE [dbo].[tblPOGaugeDetail] ADD  DEFAULT ((0)) FOR [bolGageReturned]
GO

ALTER TABLE [dbo].[tblPOGaugeDetail] ADD  DEFAULT ((0)) FOR [bolGageException]
GO

ALTER TABLE [dbo].[tblPOGaugeDetail] ADD  DEFAULT ((0)) FOR [bolGageExceptResolved]
GO

ALTER TABLE [dbo].[tblPOGaugeDetail] ADD  DEFAULT ((0)) FOR [bolGageLeavePriceBlank]
GO

ALTER TABLE [dbo].[tblPOGaugeDetail] ADD  DEFAULT ((0)) FOR [intGageCost]
GO

ALTER TABLE [dbo].[tblPOGaugeDetail] ADD  DEFAULT ((0)) FOR [intTurnaroundDaysOut]
GO

我希望显示计数的采购订单详细信息的查询语句

SELECT dbo_tblPODetail.intPurchaseOrderInstance, dbo_tblPODetail.strSupplierCode, dbo_tblPODetail.bolPOOpen, dbo_tblPODetail.intPONumber, dbo_tblPODetail.datDateSent
FROM dbo_tblPODetail
WHERE (((dbo_tblPODetail.bolPOOpen)=True))
ORDER BY dbo_tblPODetail.datDateSent;

我有点沮丧，因为我在DCount()和SELECT COUNT(*)上都读了一点，但似乎无法让它们中的任何一个工作。任何帮助都将不胜感激！提前感谢！

--编辑于2009年6月18日@ 1542小时--

这是当子窗体的On Current事件触发时，我尝试在代码中使用的SELECT计数的示例：

SELECT COUNT(*) AS ItemsSent 
FROM [dbo_tblPOGaugeDetail] 
WHERE [dbo_tblPOGageDetail]![intGagePOID] = [dbo_tblPODetail]![intPurchaseOrderInstance]

这是附加到子窗体中的控件的=DCOUNT语句的示例。

=DCOUNT("*", "[dbo_tblPOGaugeDetail]", "[intGagePOID] = [Forms]![frmSupplierInfoMain]![subfrmOpenPOBySupplierID]![intPurchaseOrderInstance]")

遗憾的是，这两种方法都不起作用。

Answer 1

您的查询可以在没有计数(*)的情况下工作吗？

使用实际的字段名作为DCount的第一个论点，从where字符串中获取控件名称。

For DCOUNT("[intItemPOID],"[dbo_tblPOGaugeDetail]","[intGagePOID]=" & Forms]![frmSupplierInfoMain]![subfrmOpenPOBySupplierID]![intPurchaseOrderInstance])