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There are two ways you can create a hard link: the fsutil hardlink create command or the mklink utility with the /H option. In this experiment we ll use mklink because we ll use this utility later to create a symbolic link as well. First, create a file called test.txt and add some text to it, as shown here. 1. C:\>echo hello > test.txt Now create a hard link called hard.txt as shown here: 1. C:\>mklink hard.txt test.txt /H 2. Hardlink created for hard.txt <<===>> test.txt If you list the directory s contents, you ll notice that the two files will be identical in every way, with the same creation date, permissions, and file size; only the file names differ. 1. C:\>dir *.txt 2. Volume in drive C is OS 3. Volume Serial Number is 38D4-EA71 4. Directory of C:\ 5. 10/18/2008 11:55 PM 8 hard.txt 6. 10/18/2008 11:55 PM 8 test.txt 7. 2 File(s) 16 bytes 8. 0 Dir(s) 10,646,011,904 bytes free

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Microsoft Office Access 2003 Inside Out Do you notice any stored values that don t match what you just calculated (Hint: Look at the row with the selection arrow.) If you haven t changed the sample data, you ll find several rows that I purposefully updated with invalid TotalCharge values. Here s a challenge: Go back to Design view and enter the criteria you need to display only the rows where your calculated charge doesn t match the TotalCharge stored in the table. You can find the solution saved as qxmplUnmatchedCharges in the HousingDataCopy.mdb sample database. Tip Is the Builder useful You decide. I personally never use the Expression Builder when I m creating applications in Microsoft Access. I find it more cumbersome than directly typing in the expression I think I need and then trying it out. I included this discussion because some developers might find the Expression Builder helps them learn how to build correct expression and function call syntax. We used the DateDiff function to solve this problem, but Access also has several other useful functions to help you deal with date and time values. For example, you might want to see only a part of the date or time value in your query. You might also want to use these functions to help you filter the results in your query. Table 7-5 explains each date and time function and includes filter examples that use the ContactDateTime field from the tblContactEvents table in the LawTrack Contacts sample database.

Table 7-5.

The resulting Author class is similar to the code we set up back in chapter 4. All of the extra mapping work we did has been moved to the XML file. The information in the XML mapping file nearly matches the parameters we previously used in the class s attributes. We do need to specify the Type and Member information to indicate which class and property we wish to map.

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Set an error trap On Error GoTo Insert_Err Save the Product ID lngProduct = Me.ContactEventTypeID.Column(5) Fetch the product record Set rst = CurrentDb.OpenRecordset("SELECT * FROM tblProducts " & _ "WHERE ProductID = " & lngProduct) Make sure we got a record If rst.EOF Then MsgBox "Could not find the product record for this sales event." & _ " Auto-create of " & _ "product record for this contact has failed.", _ vbCritical, gstrAppTitle rst.Close Set rst = Nothing GoTo Insert_Exit End If Check for prerequisite product If Not IsNull(rst!PreRequisite) Then Make sure contact owns the prerequisite product If IsNull(DLookup("ProductID", "tblContactProducts", _ "ProductID = " & rst!PreRequisite & " And ContactID = " & _ Me.Parent.ContactID)) Then Get the name of the prerequisite strPreReqName = DLookup("ProductName", "tblProducts", _ "ProductID = " & rst!PreRequisite) Display error MsgBox "This contact must own prerequisite product " & _ strPreReqName & " before you can sell this product." & _ vbCrLf & vbCrLf & _ "Auto-create of product record for this contact has failed", _ vbCritical, gstrAppTitle Bail rst.Close Set rst = Nothing GoTo Insert_Exit End If End If Save the price curPrice = rst!UnitPrice Done with the record - close it rst.Close Set rst = Nothing Now, find the default company for this contact varCoID = DLookup("CompanyID", "qryContactDefaultCompany", _ "ContactID = " & Me.Parent.ContactID.Value) If not found, then disallow product sale If IsNothing(varCoID) Then MsgBox "You cannot sell a product to a Contact who does not have a " & _ "related Company that is marked as the default for this Contact.", _ vbCritical, gstrAppTitle GoTo Insert_Exit End If Set up the INSERT command

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