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Microsoft Office Access 2003 Inside Out in DAO, the Find method in ADO is limited to a single simple test on a column in the form "<column-name> <comparison> <comparison-value>". Note that to search for a Null value, you must say: "[SomeColumn] = Null", not "[SomeColumn] Is Null" as you would in DAO. Also, <comparison> can be only <, >, <=, >=, <>, =, or LIKE. Note that if you want to use the LIKE keyword, you can use either the ANSI wildcards "%" and "_" or the Access JET wildcards "*" and " ", but the wildcard can appear only at the end of the <comparison-value> string. If you want to search for rows using a more complex filter, you must assign a string variable or an expression containing the criteria for finding the records you want to the Filter property of the recordset. This limits the rows in the recordset to only those that meet the filter criteria. The criteria string must be made up of the simple comparisons that you can use with Find, but you can include multiple comparisons with the AND or OR Boolean operators. For example, to find the first row in the qryContactProducts query s recordset whose SoldPrice field is greater than $200, enter the following:

rcdContactProducts.MoveFirst rcdContactProducts.Find "SoldPrice > 200" ' EOF property will be true if nothing found If Not rcdContactProducts.EOF Then ' Found a record!

Many concepts are specific to each domain and have no direct mapping to another domain. Figure 1.4 gives an overview of the concepts used in .NET and object-oriented programming, in comparison to the concepts used in data sources such as XML documents or relational databases. Too often, programmers have to do a lot of plumbing work to tie together the different domains. Different APIs for each data type cause developers to spend an inordinate amount of time learning how to write, debug, and rewrite brittle code. The usual culprits that break the pipes are bad SQL query strings or XML tags, or content that doesn t get checked until runtime. .NET languages such as C# and

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To find all rows in qryContactProducts where the product was sold after February 1, 2003, and SoldPrice is greater than $200, enter the following:

rcdContactProducts.Filter = & "DateSold > #2/1/2003# AND SoldPrice > 200" ' EOF property will be true if filter produces no rows If Not rcdODetails.EOF Then ' Found some rows!

Figure 1.4 .NET applications and data sources are different worlds. The concepts used in objectoriented programming are different from the concepts used with relational databases and XML.

To delete a row in a keyset, simply move to the row you want to delete and then use the Delete method. For example, to delete the first row in the qryContactProducts query s recordset that hasn t been invoiced yet (the Invoiced field is false), enter the following:

Dim cnThisConnect As ADODB.Connection Dim rcdContactProducts As New ADODB.RecordSet Set cnThisConnect = CurrentProject.Connection rcdContactProducts.Open "qryContactProducts", _ cnThisConnect, adOpenKeyset, adLockOptimistic, adCmdTable rcdContactProducts.MoveFirst rcdContactProducts.Find "Invoiced = 0" ' Test the recordset EOF property for "not found" If Not rcdContactProducts.EOF Then rcdContactProducts.Delete End If

If you want to update rows in a recordset, move to the first row you want to update. Although ADO does not require you to use the Edit method to lock the row and make it updatable you can optionally use the Edit method to signal your intention to the database engine. You 810

Understanding Visual Basic Fundamentals can refer to any of the updatable fields in the row by name to change their values. You can use the Update method on the recordset to explicitly save your changes before moving to another row. ADO automatically saves your changed row when you move to a new row. If you need to discard an update, you must use the CancelUpdate method of the recordset object. For example, to increase by 10 percent the SoldPrice entry of the first row in the rcdContactProducts query s recordset whose SoldPrice value is greater than $200, enter the following:

The output indicates the maximum size of the change journal on the volume and its current state. As a simple experiment to see how NTFS records changes in the journal, create a file called Usn.txt in the current directory, rename it to UsnNew.txt, and then dump the journal with Usndump, as shown here: 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14.

code, and compile-time checks. Still, this can become broken if we start to include malformed SQL queries or XML fragments in our code, none of which are validated by the compiler. A successful solution requires bridging the different technologies and solving the object-persistence impedance mismatch a challenging and resource-intensive problem. To solve this problem, we must resolve the following issues between .NET and data source elements:

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