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Output parameters are usually used to pass values between stored procedures, but sometimes they need to be accessed from Visual Basic, so let s write a stored procedure with an output parameter so we can use it in a Visual Basic program later. We ll also show how to return a value other than zero. 1. Reopen the first SQL edit window (see Figure 12-3). Replace the SQL there with

String[] suggestions = spellChecker.suggestSimilar(misspelledUserInput, 5);

create procedure sp_Orders_By_EmployeeId2 @employeeid int, @ordercount int = 0 output as select orderid, customerid from orders where employeeid = @employeeid; select @ordercount = count(*) from orders where employeeid = @employeeid return @ordercount

assert suggestions.length == 1 "incorrect suggestion count";

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In this exercise, you will work with the KeyPress event. The KeyPress event gets into the action whenever the associated control receives input in the form of a keypress; if that key has an ASCII value, the KeyPress event is raised. To try this event, follow these steps: 1. Navigate to Solution Explorer and open the Events.vb form in Design view. 2. Select the TextBox control, open the Properties window, and click the Events button. In the events list, double-click in the text area of the KeyPress event. This will simply create an event handler for the KeyPress event. 3. Switch to Code view and add the following code to the KeyPress event handler: Private Sub TextBox1_KeyPress(ByVal sender As System.Object, ByVal e As _ System.Windows.Forms.KeyPressEventArgs) _ Handles TextBox1.KeyPress If Char.IsDigit(e.KeyChar) = True Then Label1.Text = "You have pressed a Numeric key" Else If Char.IsLetter(e.KeyChar) = True Then Label1.Text = "You have pressed a Letter key" End If End If End Sub

for (String suggestion : suggestions) { System.out.println(suggestion); assert suggestion.equals("keanu"); } tx.commit();

2. To execute the stored procedure, refresh the Stored Procedures node, right-click dbo.sp_Orders_By_EmployeeId2, and click Execute Stored Procedure . Enter 2 in the Value column for @employeeid and click OK. You should get the result in Figure 12-7. Note that both the @ordercount and Return Value rows show 96. These two rows plus the 96 in the Results window explain why 98 rows is displayed in the status bar.

} finally { session.close(); } } private SpellChecker buildSpellCheckIndex(String fieldName, FullTextSession session) throws Exception { SearchFactory searchFactory = session.getSearchFactory(); Get the DVD DirectoryProvider[] providers = index searchFactory.getDirectoryProviders(Dvd.class); directory

4. Now go to the Build menu and click Build Solution; you should see a message indicating a successful build. 5. Press F5 to run the application. Click inside the text box and then press a number or letter key on the keyboard. You will see a message is displayed in the Label control indicating which type of key you pressed.

You added an output parameter, @ordercount,

org.apache.lucene.store.Directory DvdDirectory = providers[0].getDirectory(); IndexReader spellReader = null; SpellChecker spellchecker = null; try { // read from the DVD directory spellReader = IndexReader.open(DvdDirectory); LuceneDictionary dict = Create new LuceneDictionary(IndexReader dictionary instance .open(DvdDirectory), FIELD_NAME);

You also added an additional query:

// build the spellcheck index in the base directory spellDir = FSDirectory.getDirectory(baseDir); spellchecker = new SpellChecker(spellDir); Create a // build the directory spellchecker from the DVD index spellchecker.indexDictionary(dict);

With the KeyPress event, you recognize whether a numeric or alphabetic key has been pressed at a particular point in time. The conditional if statement helps you trace which key has been pressed and displays the appropriate message in the Label control: If Char.IsDigit(e.KeyChar) = True Then Label1.Text = "You have pressed a Numeric key" Else If Char.IsLetter(e.KeyChar) = True Then Label1.Text = "You have pressed a Letter key" End If End If

} finally { if (spellReader != null) spellReader.close(); } return spellchecker; }

and that s why we used a semicolon in sp_Orders_By_EmployeeId, to separate the first query from the second. You assigned the scalar returned by the new query to the output parameter in the SELECT list:

private void buildIndex(FullTextSession session, Transaction tx) { session = Search.getFullTextSession(openSession()); tx = session.beginTransaction(); for (int x = x + 1; x < texts.length; x++) { Dvd dvd = new Dvd(); dvd.setId(x); dvd.setDescription(texts[x]); session.save(dvd); } tx.commit(); session.clear(); }

@ordercount = count(*)

The first thing to accomplish is to build the DVD index and build the spellchecker index B after that. We define a misspelled word C to see if it is in the spellchecker

Summary

then you returned the same value:

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