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ome kinds of data have special formats, are very large, or vary greatly in size. Here, we ll show you techniques for working with text and binary data. In this chapter, we ll cover the following: Understanding SQL Server text and binary data types Storing images in a database Retrieving images from a database Working with text data We ll also present the T-SQL for creating tables in the tempdb database, which is intended to hold any temporary table. We ll start by covering what data types support these kinds of data.

Let s retrieve our first stored procedure and change it to sort employees by name. 1. In Object Explorer, right-click dbo.sp_Select_All_Employees and click Modify. The code will be displayed in an edit window, embedded in an ALTER PROCEDURE statement. (See Figure 12-8.)

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public class TestPDFTextExtractor extends SearchTestCase { InputStream istream = null; private Analyzer analyzer = new StandardAnalyzer(); public void testPDFExtractor() throws Exception { FullTextSession session = Search.getFullTextSession(openSession()); Transaction tx = session.beginTransaction(); PDDocument doc = null; try { File f = new File("ch13/src/com/manning/hsia/dvdstore/file1.pdf"); istream = new FileInputStream(f.getAbsolutePath()); Get the PDF via an PDFParser p = new PDFParser(istream); p.parse(); doc = p.getPDDocument(); Parse to a PDDocument Pdf pdf = getDocument(doc); closeInputStream(istream); closeDocument(doc); buildIndex(pdf); QueryParser parser = new QueryParser("description", analyzer); Query query = parser.parse("description:salesman"); org.hibernate.search.FullTextQuery hibQuery = s.createFullTextQuery(query, Pdf.class); List results = hibQuery.list(); assert results.size() == 1: "incorrect result size"; Pdf result = (Pdf) results.get(0); assert result.getAuthor().startsWith("John Griffin"): "incorrect author"; assert result.getDescription().startsWith("Keanu Reeves"): "incorrect description";

default Lucene field name of a property, it s considered a bad practice and will make querying more unnatural, as you ll see in the query section of this chapter. imageURL, which is not marked by @Field, won t be indexed in the Lucene document even if Hibernate stores it in the database.

2. Add an ORDER BY clause to the query and execute the ALTER PROCEDURE statement:

An object instance mapped by Hibernate roughly corresponds to a table row in the database. An object property is roughly materialized to a table column. To make the same analogy in the Lucene index, an object instance mapped by Hibernate roughly corresponds to a Lucene document, and an object property is roughly materialized to a Lucene field in the document. Now take this analogy with a grain of salt because this oneto-one correspondence isn t always verified. We ll come to these more exotic cases later in this book.

SQL Server provides the types CHAR, NCHAR, VARCHAR, NVARCHAR, BINARY, and VARBINARY for working with reasonably small text and binary data. You can use these with text (character) data up to a maximum of 8,000 bytes (4,000 bytes for Unicode data, NCHAR, and NVARCHAR, which use 2 bytes per character). For larger data, which SQL Server 2005 calls large-value data types, you should use the VARCHAR(MAX), NVARCHAR(MAX), and VARBINARY(MAX) data types. VARCHAR(MAX) is for nonUnicode text, NVARCHAR(MAX) is for Unicode text, and VARBINARY(MAX) is for images and other binary data.

3. Execute the stored procedure in Object Explorer. You should see the screen in Figure 12-9. Notice the employee names are now sorted.

The ean property is indexed slightly differently than the others While we still use @Field to map it, two new attributes have been defined The first one, index, specifies how the property value should be indexed While we have decided to chunk title and description into individual words to be able to search these fields by word (this process is called tokenization), the ean property should be treated differently EAN, which stands for European Article Number, is the article bar code that you can see on just about any product sold nowadays EAN is a superset of the UPC (Universal Product Code) used in North America It would be fairly bad for the indexing process to tokenize a unique identifier because it would be impossible to search by it That s why the index attribute is set to Index.

It works very simply. SSMSE retrieves the source code for the stored procedure so you can conveniently edit it. After you ve executed the ALTER PROCEDURE statement, the stored procedure is updated in the database. There is no need to refresh the Stored Procedures node. You just right-clicked on the procedure and executed it.

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