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You can create as many input and output parameters as you need. You must provide command parameters for all input parameters that don t have default values. You don t have to provide command parameters for any output parameters you don t need to use. Input and output parameter names must agree with the parameter names in the stored procedure, except for case (remember that T-SQL is not case sensitive). Though it s handled in ADO.NET as a command parameter, there is always only one return value. Like output parameters, you don t need to create a command parameter for the return value unless you intend to use it. But unlike input and output parameters, you can give it whatever parameter name you choose.

Since Microsoft has recently (as of this writing) released its file formats to the public domain, the POI projects will likely be changing quite a bit over the next few months.

Let s look at an example of extracting the textual information from a Microsoft Word 2003 document. To run this example you ll need to have both of these .jar files in your classpath along with the usual .jars.

Summary

Fill() and then display the value of the connection s State property. It will be Open. Comment out the Open() call, and run it again. State will be closed.

For the following unit test the document was changed from one paragraph to two by splitting the second sentence into a separate paragraph. This was done to demonstrate the return of individual paragraphs as different elements in the String array.

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In this chapter you created simple stored procedures, to get a feel for the kind of input and output they provide, as a basis for understanding what s involved in calling stored procedures from Visual Basic. You saw that calling stored procedures isn t inherently different from executing queries and statements. You simply create appropriate command parameters for the stored procedure parameters you need to use. You applied the same techniques that you practiced in earlier chapters. We didn t cover handling multiple result sets from stored procedures, because you use the same technique as for queries, which you used in 7. Now you ll extend your database programming skills to handle ADO.NET and database exceptions.

public class TestMSDocToIndex extends SearchTestCase { private Analyzer analyzer = new StandardAnalyzer(); public void testExtractFromWordDoc() throws Exception { File f = new File("ch13/src/com/manning/hsia/dvdstore/file1.doc"); buildIndex(f.getAbsolutePath(), session, tx); tx = s.beginTransaction(); QueryParser parser = new QueryParser(decription, analyzer); Query query = parser.parse(description + ":reeves"); org.hibernate.search.FullTextQuery hibQuery = s.createFullTextQuery(query, Dvd.class); List<Dvd> results = hibQuery.list(); assert results.size() == 2: "wrong number of results"; for (Dvd dvd : results) { assertTrue(dvd.getDescription().indexOf("Reeves") >= 0); }

p to now we ve been rather relaxed in our handling of database exceptions. Robust database applications demand more careful attention to this important issue. Structured exception handling is both elegant and robust. In database programming, errors come from three sources: application programs, ADO.NET, and database servers. We assume you re familiar with handling application exceptions in Visual Basic with Try statements, so we ll focus on the last two sources. In this chapter, we ll cover the following: Handling ADO.NET exceptions Handling SQL Server exceptions

DvdFromBridge.class.getName()).list())

In the previous example, you saw how to dynamically filter and sort data in a data table using the Select method. However, ADO.NET has another approach for doing much the same thing and more: data views. A data view (an instance of class System.Data.DataView) enables you to create dynamic views of the data stored in an underlying data table, reflecting all the changes made to its content and its ordering. This differs from the Select method, which returns an array of data rows whose contents reflect the changes to data values but not the data ordering.

for (Object element : s.createQuery("from " + s.delete(element); tx.commit(); s.close();

First, let s see how to handle exceptions thrown by ADO.NET. These exceptions arise when ADO.NET is trying to communicate with SQL Server, before the database server responds. We ll use a Windows application, because it makes generating and viewing error situations and messages more convenient. To generate an exception expediently, you ll try to execute a stored procedure without specifying the CommandText property. You ll do this first without handling the exception, then you ll modify things to handle it.

// The preferred way to do this is via a bridge. For // simplicity s sake we chose not to do that here. buildIndex( String filename, FullTextSession session, Transaction tx ) Get the file via an InputStream istream = InputStream new FileInputStream(new File(filename)); WordExtractor extractor = new WordExtractor(istream); String[] paragraphs = extractor.getParagraphText();

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