ACCESS數(shù)據(jù)庫中Field對(duì)象的caption屬性（也就是標(biāo)題）是用來設(shè)置數(shù)據(jù)字段的標(biāo)題，在正常的數(shù)據(jù)庫設(shè)計(jì)中為了保持維護(hù)的便利性，許多開發(fā)者都將字段名與標(biāo)題做了分別設(shè)置，標(biāo)題往往比字段名更友好，更能說明字段的用途。本篇從另一個(gè)角度來說明如何用ＶＢＡ讀寫該屬性。
Field對(duì)象的CAPTION屬性并不是ADO原生對(duì)象，而是“可由ADO訪問的ACCESS屬性”，在幫助文檔中介紹了兩種訪問這個(gè)屬性的方法，一種利用ADO，一種利用DAO，由于在ACCESS2003及以前的版本中Field對(duì)象并不是ACCESSObject對(duì)象，因而也就沒有AccessObjectProperties 屬性，所以我們也就不能在ADO中去解決這個(gè)問題，現(xiàn)在用另一種方式來解決DAO的代碼。
Sub SetProperty(dbsTemp As DAO.Field, strName As String, _
booTemp As String)
Dim prpNew As DAO.Property
Dim errLoop As Error
' Attempt to set the specified property.
On Error GoTo Err_Property
dbsTemp.Properties(strName) = booTemp
On Error GoTo 0
Exit Sub
Err_Property:
' Error 3270 means that the property was not found.
If DBEngine.Errors(0).Number = 3270 Then
' Create property, set its value, and append it to the
' Properties collection.
Set prpNew = dbsTemp.CreateProperty(strName, _
dbText, booTemp)
dbsTemp.Properties.Append prpNew
Resume Next
Else
' If different error has occurred, display message.
For Each errLoop In DBEngine.Errors
MsgBox "Error number: " & errLoop.Number & vbCr & _
errLoop.Description
Next errLoop
End
End If
End Sub
Sub DisplayClumCaption(ByVal tbname As String,
ByVal fldIndex As Integer)
Dim dset As DAO.TableDef) //*****必須使用TableDef對(duì)象
Dim i As Integer
Dim tmpProp As DAO.Property //強(qiáng)制使用DAO類型
Dim fld As DAO.Field //強(qiáng)制使用DAO類型
Dim tmpTxt As String
'On Error Resume Next
Dim msg As String
Dim cdb As DAO.Database //*****強(qiáng)制使用DAO類型
Set cdb = CurrentDb //****關(guān)鍵，確定對(duì)當(dāng)前數(shù)據(jù)庫的靜態(tài)引用
Set dset = cdb.TableDefs(tbname)//*****必須使用TableDef對(duì)象
For Each fld In dset.Fields
tmpTxt = fld.Name
SetProperty fld, "Caption", tmpTxt
msg = msg + fld.Properties("Caption")
msg = msg + Chr(10) + Chr(13)
Next fld
MsgBox msg
End Sub
在以上部分的代碼中有兩個(gè)SUB，一個(gè)是SetProperty ，用來判斷一個(gè)字段是否有指定的屬性，如果沒有設(shè)置，就將相應(yīng)的數(shù)值賦給該屬性。另一個(gè)是DisplayClumCaption，這是對(duì)指定表中的字段按字段名設(shè)置其CAPTION屬性的演示代碼。如果有需要，大家可以對(duì)SetProperty進(jìn)行修改，使他變成一個(gè)只讀的函數(shù)，用來枚舉指定表中每個(gè)字段的CAPTION屬性。DisplayClumCaption代碼中，打“星號(hào)”的地方是要重點(diǎn)注意的，不然可能會(huì)在MSDN中多走彎路。
Field對(duì)象的CAPTION屬性并不是ADO原生對(duì)象，而是“可由ADO訪問的ACCESS屬性”，在幫助文檔中介紹了兩種訪問這個(gè)屬性的方法，一種利用ADO，一種利用DAO，由于在ACCESS2003及以前的版本中Field對(duì)象并不是ACCESSObject對(duì)象，因而也就沒有AccessObjectProperties 屬性，所以我們也就不能在ADO中去解決這個(gè)問題，現(xiàn)在用另一種方式來解決DAO的代碼。
Sub SetProperty(dbsTemp As DAO.Field, strName As String, _
booTemp As String)
Dim prpNew As DAO.Property
Dim errLoop As Error
' Attempt to set the specified property.
On Error GoTo Err_Property
dbsTemp.Properties(strName) = booTemp
On Error GoTo 0
Exit Sub
Err_Property:
' Error 3270 means that the property was not found.
If DBEngine.Errors(0).Number = 3270 Then
' Create property, set its value, and append it to the
' Properties collection.
Set prpNew = dbsTemp.CreateProperty(strName, _
dbText, booTemp)
dbsTemp.Properties.Append prpNew
Resume Next
Else
' If different error has occurred, display message.
For Each errLoop In DBEngine.Errors
MsgBox "Error number: " & errLoop.Number & vbCr & _
errLoop.Description
Next errLoop
End
End If
End Sub
Sub DisplayClumCaption(ByVal tbname As String,
ByVal fldIndex As Integer)
Dim dset As DAO.TableDef) //*****必須使用TableDef對(duì)象
Dim i As Integer
Dim tmpProp As DAO.Property //強(qiáng)制使用DAO類型
Dim fld As DAO.Field //強(qiáng)制使用DAO類型
Dim tmpTxt As String
'On Error Resume Next
Dim msg As String
Dim cdb As DAO.Database //*****強(qiáng)制使用DAO類型
Set cdb = CurrentDb //****關(guān)鍵，確定對(duì)當(dāng)前數(shù)據(jù)庫的靜態(tài)引用
Set dset = cdb.TableDefs(tbname)//*****必須使用TableDef對(duì)象
For Each fld In dset.Fields
tmpTxt = fld.Name
SetProperty fld, "Caption", tmpTxt
msg = msg + fld.Properties("Caption")
msg = msg + Chr(10) + Chr(13)
Next fld
MsgBox msg
End Sub
在以上部分的代碼中有兩個(gè)SUB，一個(gè)是SetProperty ，用來判斷一個(gè)字段是否有指定的屬性，如果沒有設(shè)置，就將相應(yīng)的數(shù)值賦給該屬性。另一個(gè)是DisplayClumCaption，這是對(duì)指定表中的字段按字段名設(shè)置其CAPTION屬性的演示代碼。如果有需要，大家可以對(duì)SetProperty進(jìn)行修改，使他變成一個(gè)只讀的函數(shù)，用來枚舉指定表中每個(gè)字段的CAPTION屬性。DisplayClumCaption代碼中，打“星號(hào)”的地方是要重點(diǎn)注意的，不然可能會(huì)在MSDN中多走彎路。