اجرای دستور select در VBA اکسس
در این مقاله به بررسی نحوه اجرای دستور select به صورت مستقیم در محیط برنامه نویسی VBA در Microsoft Access می پردازیم. لطفا به متدهای زیر دقت فرمائید:
Sub SelectX1()
Dim dbs As Database, rst As Recordset
' Modify this line to include the path to Northwind
' on your computer.
Set dbs = OpenDatabase("Northwind.mdb")
' Select the last name and first name values of all
' records in the Employees table.
Set rst = dbs.OpenRecordset("SELECT LastName, " _
& "FirstName FROM Employees;")
' Populate the recordset.
rst.MoveLast
' Call EnumFields to print the contents of the
' Recordset.
EnumFields rst,12
dbs.Close
End Sub
Sub SelectX2()
Dim dbs As Database, rst As Recordset
' Modify this line to include the path to Northwind
' on your computer.
Set dbs = OpenDatabase("Northwind.mdb")
' Count the number of records with a PostalCode
' value and return the total in the Tally field.
Set rst = dbs.OpenRecordset("SELECT Count " _
& "(PostalCode) AS Tally FROM Customers;")
' Populate the Recordset.
rst.MoveLast
' Call EnumFields to print the contents of
' the Recordset. Specify field width = 12.
EnumFields rst, 12
dbs.Close
End Sub
Sub SelectX3()
Dim dbs As Database, rst As Recordset
' Modify this line to include the path to Northwind
' on your computer.
Set dbs = OpenDatabase("Northwind.mdb")
' Count the number of employees, calculate the
' average salary, and return the highest salary.
Set rst = dbs.OpenRecordset("SELECT Count (*) " _
& "AS TotalEmployees, Avg(Salary) " _
& "AS AverageSalary, Max(Salary) " _
& "AS MaximumSalary FROM Employees;")
' Populate the Recordset.
rst.MoveLast
' Call EnumFields to print the contents of
' the Recordset. Pass the Recordset object and
' desired field width.
EnumFields rst, 17
dbs.Close
End Sub
متد نمایش رکوردهای واکشی شده توسط SELECT در متدهای فوق:
Sub EnumFields(rst As Recordset, intFldLen As Integer)
Dim lngRecords As Long, lngFields As Long
Dim lngRecCount As Long, lngFldCount As Long
Dim strTitle As String, strTemp As String
' Set the lngRecords variable to the number of
' records in the Recordset.
lngRecords = rst.RecordCount
' Set the lngFields variable to the number of
' fields in the Recordset.
lngFields = rst.Fields.Count
Debug.Print "There are " & lngRecords _
& " records containing " & lngFields _
& " fields in the recordset."
Debug.Print
' Form a string to print the column heading.
strTitle = "Record "
For lngFldCount = 0 To lngFields - 1
strTitle = strTitle _
& Left(rst.Fields(lngFldCount).Name _
& Space(intFldLen), intFldLen)
Next lngFldCount
' Print the column heading.
Debug.Print strTitle
Debug.Print
' Loop through the Recordset; print the record
' number and field values.
rst.MoveFirst
For lngRecCount = 0 To lngRecords - 1
Debug.Print Right(Space(6) & _
Str(lngRecCount), 6) & " ";
For lngFldCount = 0 To lngFields - 1
' Check for Null values.
If IsNull(rst.Fields(lngFldCount)) Then
strTemp = "<null>"
Else
' Set strTemp to the field contents.
Select Case _
rst.Fields(lngFldCount).Type
Case 11
strTemp = ""
Case dbText, dbMemo
strTemp = _
rst.Fields(lngFldCount)
Case Else
strTemp = _
str(rst.Fields(lngFldCount))
End Select
End If
Debug.Print Left(strTemp _
& Space(intFldLen), intFldLen);
Next lngFldCount
Debug.Print
rst.MoveNext
Next lngRecCount
End Sub