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You might be wondering why the second expression includes parentheses. When evaluating an arithmetic expression, Access evaluates certain operations before others, known as operator precedence. Table 7-4 shows you operator precedence for arithmetic operations. In an expression with no parentheses, Access performs the operations in the order listed in the table. When operations have the same precedence (for example, multiply and divide), Access performs the operations left to right.

Read-committed isolation involves the concept of transacted writers and transacted readers The former always view the most up-to-date version of a file, including all changes made by the transaction that is currently associated with the file At any given time, there can be only one transacted writer for a file, which means that its write access is exclusive Transacted readers, on the other hand, only have access to the committed version of the file at the time they open the file They are therefore isolated from changes made by transacted writers This allows for readers to have a consistent view of a file, even when a transacted writer commits its changes To see the updated data, the transacted reader must open a new handle to the modified file.

The query using the Contains method translates to the following SQL expression:

Table 7-4.

Microsoft Access Evaluates Operators in the Following Order:

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1 2 3 4 5 6 Exponentiation (^) Negation a leading minus sign (-) Multiplication and division (*, /) Integer division (\) Addition and subtraction (+, -) Modulus (Mod)

After you select the fields from the table and enter the expression to calculate the total based on the daily rate, your query design grid should look something like Figure 7-16 on the next page. 237

SELECT [t0].[Title] FROM [dbo].[Book] AS [t0] WHERE [t0].[Title] LIKE @p0 -- @p0: Input NVarChar (Size = 4) NOT NULL [%on%]

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Microsoft Access evaluates expressions enclosed in parentheses first, starting with the innermost expressions. (You can enclose an expression in parentheses inside another expression in parentheses.) If you do not include the parentheses in the previous example, Access would first multiply CheckInDate times DailyRate (because multiplication and division occur before addition and subtraction) and then subtract that result from CheckOutDate. That not only gives you the wrong answer but also results in an error because you cannot subtract a Double value (the result of multiplying a date/time times a currency) from a date/time value.

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For a look at SQL injection in action, see the webcast at http://www.rockyh.net/AssemblyHijacking/ AssemblyHijacking.html.

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28 SetFieldProperty tblErrTable![ErrorString], _ "ColumnWidth", dbInteger, 7200 ' Create a Primary Key Set idxPKey = tblErrTable.CreateIndex("PrimaryKey") ' Create and append the field to the index fields collection idxPKey.Fields.Append idxPKey.CreateField("ErrorCode") ' Make it the Primary Key idxPKey.Primary = True ' Create the index tblErrTable.Indexes.Append idxPKey ' Set recordset to Errors Table recordset Set rcdErrRecSet = _ dbMyDatabase.OpenRecordset("ErrTable") Case Else ' Can't identify the error write message ' and bail out MsgBox "Unknown error in CreateErrTable " & _ Err & ", " & Error$(Err), 16 Exit Function End Select ' Initialize progress meter on the status bar varReturnVal = SysCmd(acSysCmdInitMeter, _ "Building Error Table", 32767) ' Turn on hourglass to show this might take a while DoCmd.Hourglass True ' Start a transaction to make it go fast ws.BeginTrans ' Loop through Microsoft Access error codes, ' skipping codes that generate ' "Application-defined or object-define error" ' message For lngErrCode = 1 To 32767 varErrString = AccessError(lngErrCode) If Not IsNothing(varErrString) Then If varErrString <> "Application-" & _ "defined or object-defined error" Then ' Add each error code and string to ' Errors table rcdErrRecSet.AddNew rcdErrRecSet("ErrorCode") = lngErrCode ' Some error messages are longer ' than 255 truncate rcdErrRecSet("ErrorString") = _ Left(varErrString, 255) rcdErrRecSet.Update End If End If ' Update the status meter varReturnVal = SysCmd(acSysCmdUpdateMeter, _ lngErrCode) ' Process next error code Next lngErrCode ws.CommitTrans ' Close recordset

Note that the Contains method has been translated to LIKE and the parameter value now includes the % wildcard, which is specific to SQL Server. Not all CLR functions can be translated to a database equivalent. Consider the following query:

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