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When you first instantiate a dataset, it contains no data. You obtain a populated dataset by passing it to a data adapter, which takes care of connection details and is a component of a data provider. A dataset isn t part of a data provider. It s like a bucket, ready to be filled with water, but it needs an external pipe to let the water in. In other words, the dataset needs a data adapter to populate it with data and to support access to the data source. Each data provider has its own data adapter in the same way that it has its own connection, command, and data reader. Figure 13-2 depicts the interactions between the dataset, data adapter, and data source.

public class TestSynonyms extends SearchTestCase { String desc[] = { "Keanu Reeves is completely wooden in this romantic misfired flick", "Reeves plays a traveling salesman and agrees to help a woman", "Jamie Lee Curtis finds out that he's not really a used car salesman" }; public void testQuery() throws Exception { FullTextSession session = Search.getFullTextSession( openSession() ); Transaction tx = session.getTransaction(); SynonymHelper helper = new SynonymHelper(); // buildSynonymIndex();

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Stored procedures can have parameters that can be used for input or output. They also have a single integer return value (which defaults to zero), and they can return zero or more result sets. They can be called from client programs or other stored procedures. They are powerful indeed and are becoming the preferred mode for much database programming, particularly for multi-tier applications and Web services, since (among their many benefits) they can dramatically reduce network traffic between clients and database servers. You ll create three stored procedures (two of which you ll access from Visual Basic), one that is about as trivial as it can get, one that introduces you to parameters, and one that exhibits the common traits you typically handle when calling a stored procedure from Visual Basic.

String query = "movie flick"; Set<String> q = helper.getSynonyms(query, session, new StandardAnalyzer()); assert q.contains( "film" ) : "not found"; assert q.contains("picture") : "not found"; try { buildDvdIndex(session, tx) tx = session.beginTransaction(); query = "automobile"; Query expandedQuery = helper.expandQuery(query, session, new StandardAnalyzer(), description, 1.0F);

Let s create a stored procedure that produces a list of the names of employees in the Northwind database. It requires no input and doesn t need to set a return value. 1. In Object Explorer, expand the Northwind node, expand the Programmability node, right-click the Stored Procedures node, and click New Stored Procedure . (See Figure 12-1.)

org.hibernate.search.FullTextQuery hibQuery = session.createFullTextQuery( expandedQuery, Dvd.class ); results = hibQuery.list(); assert results.size() == 1 : "didn't find the synonym"; assert results.get( 0 ).getDescription() .startsWith( "Jamie Lee Curtis" ); Test result for assert results.get( 0 ).getDescription() synonym car .indexOf( "car" ) >= 0;

Figure 13-2. Dataset, data adapter, and data source interaction The data adapter constructor is overloaded. You can use any of the following to get a new data adapter. We re using the SQL Server data provider, but the constructors for the other data providers are analogous. Dim Dim Dim Dim da da da da As As As As SqlDataAdapter=New SqlDataAdapter=New SqlDataAdapter=New SqlDataAdapter=New SqlAdapter SqlAdapter(cmd) SqlAdapter(sql,conn) SqlAdapter(sql,connstring)

// uncommenting the following lines will remove all // entries in the synonym index and require it to be // rebuilt // for (Object element : s.createQuery("from " + Synonym.class.getName()).list()) { // session.delete(element); tx.commit(); } finally { s.close(); } }

2. You ll be presented with a SQL edit window as in Figure 12-2.

private void buildSynonymIndex( FullTextSession session, Transaction tx ) throws Exception { helper.buildSynonymIndex(session, "wn_s.pl"); Call helper to build }

3. It has some comments and a bit of SQL already generated that provide a skeleton for stored procedure code, but we don t need any of this, so replace it all with the following SQL:

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