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So, you can create a data adapter in four ways: You can use its parameterless constructor (assigning SQL and the connection later). You can pass its constructor a command (here, cmd is a SqlCommand object). You can pass a SQL string and a connection. You can pass a SQL string and a connection string. You ll see all this working in action shortly. For now, we ll move on and show how to use data tables, data columns, and data rows. You ll use these in upcoming sections.

public void buildDvdIndex( FullTextSession session, Transaction tx) throws Exception { tx = session.beginTransaction(); for (int x = 0; x < desc.length; x++) { Dvd dvd = new Dvd(); dvd.setDescription(desc[x]); dvd.setId(x + 1); session.save(dvd); } tx.commit(); session.clear(); } }

4. Execute the SQL. You should see the screen in Figure 12-3.

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First and foremost, build the synonym index B. In this code it is commented out, but you can uncomment it the first time the test is run and use it as you see fit. The index is deleted at F, which is also commented in this code. We re running two different tests here. The first test C makes certain that synonym generation occurs correctly by querying for the terms flick and movie and ensuring that other synonyms were generated. The actual query terms generated here are word:movie word:film word:flick word:pic word:picture. Notice that the original term is automatically included in the token list. Using q.toString() will show you the term list. The second test D queries our DVD description index for the term automobile. The query tokens generated for this search are contents:automobile contents:auto contents:car contents:machine contents:motorcar. Notice that the single hit that is returned was on the term car. This is a good proof that the synonyms actually work the way they should. E asserts that the synonym car was found by the query. The actual call to the SynonymHelper class to build the index is shown at G. For those of you who said it just could not be done, next up is utilizing regular expressions (regex) in your queries.

A data table is an instance of the class System.Data.DataTable. It s conceptually analogous to a relational table. As shown in Figure 13-1, a data table has collections of data rows and data columns. You can access these nested collections via the Rows and Columns properties of the data table. A data table can represent a stand-alone independent table, either inside a dataset as you ll see in this chapter or as an object created by another method, as you saw in the previous chapter when a data table was returned by calling the GetSchemaTable method on a data reader. A data column represents the schema of a column within a data table and can then be used to set or get column properties. For example, you could use it to set the default value of a column by assigning a value to the DefaultValue property of the data column.

13.1.4 Implementing regular expression searches and querying for sa.[aeiou]s.*

s Caution The sp_ prefix can incur a runtime cost, since SSE treats all stored procedure names with this

Synonyms are all well and good, but they still won t help with misspellings (this is just one example of how regex could help). If you were able to use synonyms to help with queries of commonly misspelled words, it would be possible to obtain results where you might not otherwise.

prefix as system stored procedures and expects to find them in the master database. If it doesn t find them there, it has to look again in the SSE memory cache. If you name your own procedures with an sp_ prefix, you can avoid this cost by storing them in the master database. The best practice is to not use the sp_ prefix, though in our trivial examples, it doesn t matter.

Admittedly this is not the best way to help with misspelled words. Spellcheckers come to mind first, and the Lucene website offers a spellchecking contribution. N-grams also come to mind, but they re beyond the scope of this book, other than what is discussed in section 5.3.3. If you re interested in finding out more about them, plenty of documentation is available on the internet.

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