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Let s do another variation, using correlation names and aliases together. Enter the following query into SSMSE and execute it. You should see the results in Figure 11-14.

org.hibernate.search.FullTextQuery hibQuery = session.createFullTextQuery(query, Dvd.class); List<Dvd> results = hibQuery.list(); assert results.size() == 2: "incorrect hit count"; assert results.get(0).getTitle() .equals("The Office - Season One"); for (Dvd dvd : results) { System.out.println(dvd.getTitle()); }

select o.orderid OrderID, o.customerid CustomerID, e.lastname Employee from orders o join employees e on o.employeeid = e.employeeid

So far, all you ve done is retrieve data from a data source. Once you have a populated data reader in your hands, you can do a lot more. There are a number of useful methods for retrieving schema information or retrieving information directly related to a result set. Table 12-4 describes some of the metadata methods and properties of a data reader. Table 12-4. Data Reader Metadata Properties and Methods

Dvd.class.getName()).list())

} finally { tx.commit();

You simply added aliases for each column in the select list. This produced more customized column headings. It had no effect on the rest of the query.

for (Object element : session.createQuery("from " + session.delete(element);

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A property that gets the depth of nesting for the current row A property that holds the number of columns in the current row A method that accepts an index and returns a string containing the name of the column data type A method that accepts an index and returns the .NET Framework type of the object A method that accepts an index and returns the name of the specified column

o.customerid CustomerID,

CHAPTER 7 session.close(); } }

You also removed the keyword INNER from the join operator, just to prove that it s optional. It s better practice to use it, because it clearly distinguishes inner joins from outer joins, which you ll look at soon.

private void buildIndex(FullTextSession session, Transaction tx) { for (int x = 0; x < titles.length; x++) { Dvd dvd = new Dvd(); dvd.setTitle(titles[x]); dvd.setId(x); session.save(dvd); } tx.commit(); session.clear(); } } +title:season title:story -title:complete The Office - Season One Gargoyles - Season Two, Vol. 1

A method that accepts a column name and returns the column index A method that returns column metadata A property that indicates whether the data reader has any rows A property that gets the number of rows changed, inserted, or deleted

A BooleanQuery can be created in different ways, and this example demonstrates a couple of them. At B we create a BooleanClause and add it to the query C. Next we create two TermQuerys and add them D. From this you can see how any query type could easily be added. Hopefully, you immediately noticed the Boolean.Occur terms in the BooleanClause and the query.add() statements. The possible selections for this enumeration are shown in table 7.3.

As the next example of inner joins, you ll look at their original but deprecated syntax. You might see this frequently in legacy code, and it still works with most DBMSs, but the SQL standard might not allow it in the future.

Meaning Clauses or queries with this operator must appear in the matching documents. Clauses or queries with this operator must not appear in the matching documents. NOTE: If a BooleanQuery contains a MUST_NOT clause at least one MUST or SHOULD clause is also required. It s not possible to search for queries that consist of only a MUST_NOT clause. However, it is possible to simulate the effect of this by creating a BooleanQuery consisting of your MUST_NOT clause and another clause consisting of a MatchAllDocsQuery. This results in all documents being returned except those you excluded with your MUST_NOT clause. Obviously, you can easily generate variations of this. Clauses or queries with this operator should appear in the matching documents. NOTE: If a BooleanQuery has no MUST clauses, one or more SHOULD clauses that must match a document for the BooleanQuery to generate results are also required.

To write an inner join using the original syntax, enter the following query into SSMSE and execute it. You should see the results in Figure 11-15.

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