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(If you were to run the PersistAdds program multiple times, you d have more than one row that matches this selection criteria) 'select employees Dim filt As String = "firstname = 'Roy'" & _ "and lastname = 'Beatty'" 'delete employees Dim row As DataRow For Each row In dtSelect(filt) ' rowDelete() Next row Finally, you set the data adapter s DeleteCommand property with the command to delete from the Employees table so it will be the SQL the data adapter executes when you call its Update method You then call Update() on the data adapter to propagate the changes to the database: daDeleteCommand = cmd daUpdate(ds, "employees") Whether you delete one row or several, your SQL is parameterized, and the data adapter will look for all deleted rows in the employees data table and submit deletes for all of them to the Employees database table.

FullTextQuery createFullTextQuery(org.apache .lucene.search.Query, Class...)

if @ordercount > 10 raiserror ( 'Orders Count is greater than 10 - Notify the Business Manager', 16, 1 )

FullTextSession methods (continued)

Listing 13-4. Button3_Click()

SearchFactory getSearchFactory() index(Object)

If you check with Database Explorer or SSMSE, you ll see the row has been removed from the database Roy Beatty is no longer in the Employees table..

Manually triggers indexing of an entity. The entity must be managed. Manually triggers an entity removal from the index. The entity type as well as the id are passed as parameters. Manually triggers the removal of all index information for a given entity type. Forces the flushing of all pending indexing changes to the Lucene indexes immediately

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' Create connection Dim conn As SqlConnection = New SqlConnection( _ "server = .\sqlexpress;" _ & "integrated security = true;" _ & "database = northwind" _ ) ' Create command Dim cmd As SqlCommand = conn.CreateCommand() ' Specify that a stored procedure is to be executed cmd.CommandType = CommandType.StoredProcedure cmd.CommandText = "sp_DbException_1" Try ' Open connection conn.Open() ' Execute stored procedure cmd.ExecuteNonQuery() Catch ex As System.Data.SqlClient.SqlException Dim str As String = "Source: " & ex.Source str &= ControlChars.NewLine str &= "Number: " & ex.Number.ToString() str &= ControlChars.NewLine str &= "Message: " & ex.Message str &= ControlChars.NewLine str &= "Class: " & ex.Class.ToString() str &= ControlChars.NewLine str &= "Procedure: " & ex.Procedure.ToString()

purge(Class, Serializable)

Although it s straightforward, it s a bit of a hassle to code SQL statements for the UpdateCommand, InsertCommand, and DeleteCommand properties, so each data provider has its own command builder. If a data table corresponds to a single database table, you can use a command builder to automatically generate the appropriate UpdateCommand, InsertCommand, and DeleteCommand properties for a data adapter. This is all done transparently when a call is made to the data adapter s Update method. To be able to dynamically generate INSERT, DELETE, and UPDATE statements, the command builder uses the data adapter s SelectCommand property to extract metadata for the database table. If any changes are made to the SelectCommand property after invoking the Update method, you should call the RefreshSchema method on the command builder to refresh the metadata accordingly. To create a command builder, you create an instance of the data provider s command builder class, passing a data adapter to its constructor. For example, the following code creates a SQL Server command builder: Dim da As SqlDataAdapter=New SqlDataAdapter Dim cb As SqlCommandsBuilder=New SqlCommandBuilder

&= &= &= &=

purgeAll(Class)

ControlChars.NewLine "Line Number: " & ex.LineNumber.ToString() ControlChars.NewLine "Server: " & ex.Server.ToString()

flushToIndexes()

s Note For a command builder to work, the SelectCommand data adapter property must contain a query that returns either a primary key or a unique key for the database table. If none is present, an InvalidOperation exception is generated, and the commands aren t generated.

Method Description FullTextEntityManager inherits EntityManager. All methods are available, including persist, merge, createQuery, and so on. Creates a FullTextQuery based on the Lucene query and restricted to the list of classes passed as a parameter. Entry point for executing a full-text query. Reference Section 2.4

MessageBox.Show(str, "Database Exception") Catch ex As System.Exception Dim str As String = "Source: " & ex.Source str &= ControlChars.NewLine str &= "Exception Message: " & ex.Message MessageBox.Show(str, "General Exception") Finally If conn.State = ConnectionState.Open Then MessageBox.Show("Finally block closing the connection", "Finally") conn.Close() End If End Try

FullTextQuery createFullTextQuery( org.apache.lucene.se arch.Query, Class...) SearchFactory getSearchFactory() index(Object)

6. Run the program with Ctrl+F5, then click the Database Exception-1 button. You see the message box in Figure 13-8. Click OK to close the message box, then OK to close the next one, then close the window.

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