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from openxml( @xdocp, '/states/state/city', 0 )

} public Query rewrite(IndexReader reader) throws IOException { BooleanQuery result = new BooleanQuery() { public Similarity getSimilarity(Searcher searcher) { return new DefaultSimilarity() {

public float coord(int overlap, int maxOverlap) { Refer to section 12.2.1 switch (overlap) { case 1: return 1.0f; Matched only case 2: one clause; use return boost; as is Matched both default: clauses; multiply return 0.0f; by boost } }

You passed this function three arguments: the pointer (@xdocp) to the parsed XML document, an XPath expression ('/states/state/city') that specified what part of the DOM hierarchy you intended to access (all of it), and a flag (0) that told OPENXML what kind of mapping to use to retrieve data from the DOM tree. The default mapping is attributecentric, versus element-centric, and you explicitly specified the equivalent of the default. In the WITH clause, you specified the schema for the table OPENXML would return. You declared three columns (sabbr, sname, cname), their data types, and XPath expressions for where in the hierarchy to find them. Because all data is stored as attribute values, you prefixed the attribute names in the XPath expressions with @. Because cname comes from the lowest node in the hierarchy (city), you simply specified the attribute name. The other two columns come from city s parent node (state), so you specified that node relative to the city node with ../:

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s Note In yet another somewhat confusing bit of terminology, the class is named DataSet, but the generic term is spelled dataset (when one expects data set). Why Microsoft does this is unclear, especially since data set is the more common usage outside ADO.NET. Nonetheless, we ll follow the .NET convention and call Dataset objects datasets.

}; } };

with ( sabbr char(2) '../@abbr', sname varchar(20) '../@name', cname varchar(20) '@name' )

result.add( match, true, false ); result.add( context, false, false ); return result; } public String toString(String field) { return match.toString(field) + "/" + context.toString(field); } }

The WITH clause is optional. If it s not used, OPENXML will produce an edge table, and its contents can be used like any table in a query. Edge tables provide a fine-grained view of an XML document. We won t go into details here, but we will show you in the next example what the edge table for states.xml looks like. You then tested the procedure in a convenient way, declaring a local variable, @xdoc; assigning the text of the XML document to it; and passing it to xml2tbl. (You could have read the XML document from states.xml, but the T-SQL for that is beyond the scope of this book.)

Remember chapter 12 and overriding the DefaultSimilarity B shows how BoostingQuery accomplishes its scoring modification. It does the same thing we were doing in chapter 12. The choice of what score to return, C or D, determines the multiplying factor to use in scoring the results. Let s look at an example of the BoostingQuery class in action and compare the results obtained from our TestBoostingQuery with those from listing 12.2 using the explain method. Listing 13.4 shows the results of querying for the term salesman.

So, if a dataset doesn t have to be connected to a database, how do you populate it with data and save its data back to the database This is where data adapters come in. Think of data adapters as bridges between datasets and data sources. Without a data adapter, a dataset can t access any kind of data source. The data adapter takes care of all connection details for the dataset, populates it with data, and updates the data source. In this chapter, we ll cover the following: Understanding the object model Working with datasets and data adapters Propagating changes to a data source Concurrency Using datasets and XML

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