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The sample database contains the ErrTable table, so the code will ask you if you want to delete and rebuild the table. You should click Yes to run the code. Again, I ve added line numbers to some of the lines in this code listing so that you can follow along with the line-by-line explanations in Table 22-6, which follows the listing.

1 Function CreateErrTable () ' This function creates a table containing a list of ' all the valid Access application error codes 2 ' Declare variables used in this function 3 Dim dbMyDatabase As DAO.Database, tblErrTable As DAO.TableDef, _ fldMyField As DAO.Field, idxPKey As DAO.Index 4 Dim rcdErrRecSet As DAO.Recordset, lngErrCode As Long, _ intMsgRtn As Integer

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So far, we ve focused on retrieving results from a table. We ve shown how LINQ to SQL is better than ADO.NET because we don t need to rewrite all of the repetitive plumbing code. LINQ to SQL is also able to reduce our network overhead by returning only the fields we need. If the framework were to stop here, it would have already offered a vast improvement over prior techniques. Relational databases offer specialized capabilities to access and manipulate associated sets of data. By leveraging the indexing and query execution plans, the database can provide data access faster than we d be able to do without indexes. Additionally, by processing the query on the server, we can often limit the amount of information that must be transmitted over the network. Reducing the network demands is important because the network pipe is typically one of the biggest bottlenecks of data-centric applications. Let s continue our look at LINQ by seeing how we can refine our queries using some of these additional server-side processes.

5 Dim varReturnVal As Variant, varErrString As Variant, _ ws As DAO.Workspace ' Create Errors table with Error Code and Error ' String fields ' Initialize the MyDatabase database variable ' to the current database Set dbMyDatabase = CurrentDb Set ws = DBEngine.Workspaces(0) ' Trap error if table doesn't exist ' Skip to next statement if an error occurs On Error Resume Next Set rcdErrRecSet = _ dbMyDatabase.OpenRecordset("ErrTable") Select Case Err ' See whether error was raised Case 0 ' No error table must exist On Error GoTo 0 ' Turn off error trapping intMsgRtn = MsgBox("ErrTable already " & _ "exists. Do you want to delete and " & _ "rebuild all rows ", vbQuestion + vbYesNo) If intMsgRtn = vbYes Then ' Reply was YES delete rows and rebuild ' Run quick SQL to delete rows dbMyDatabase.Execute_ "DELETE * FROM ErrTable;", dbFailOnError Else ' Reply was NO done rcdErrRecSet.Close ' Close the table Exit Function ' And exit End If Case 3011, 3078 ' Couldn't find table, ' so build it On Error GoTo 0 ' Turn off error trapping ' Create a new table to contain error rows Set tblErrTable = _ dbMyDatabase.CreateTableDef("ErrTable") ' Create a field in ErrTable to contain the ' error code Set fldMyField = tblErrTable.CreateField( _ "ErrorCode", dbLong) ' Append "ErrorCode" field to the fields ' collection in the new table definition tblErrTable.Fields.Append fldMyField ' Create a field in ErrTable for the error ' description Set fldMyField = _ tblErrTable.CreateField("ErrorString", dbText) ' Append "ErrorString" field to the fields ' collection in the new table definition tblErrTable.Fields.Append fldMyField ' Append the new table to the TableDefs ' collection in the current database dbMyDatabase.TableDefs.Append tblErrTable ' Set text field width to 5" (7200 twips) ' (calls sub procedure)

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LINQ to SQL supports a full range of filtering functionality. A filter can be as simple as finding a record with a specific value. In our example for this chapter, we want to see books that cost less than 30 dollars. We can accomplish this with the code from listing 6.10.

7

Table 7-3.

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