create barcode image c# Writing a Lucene query in Java

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Writing a Lucene query
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character preceded by \. With a clientQuery of "comment: first : line", the result would be "comment: first \: line".
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The regex expression
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For those of you who really want to know how the regular expression works and are not quite sure, it uses negative look behind on each of the characters in the clientQuery. This look behind examines each character and rejects any that are already preceded by a \ character and continues to the next character. If the character is not already preceded by a \ and it matches any of the expressions in the regexOr string, the expression is substituted for the character, so : becomes \:.
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Now let s examine how to query across several fields.
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MultiFieldQueryParser queries more than one field
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The QueryParser class was designed to perform ad hoc queries on a single field, but what do you do if what the user entered is supposed to query across more than one field For example, your application could have several drop-down boxes where the user selects field names and query types for each of these, or your application hides this complexity from your user and targets, transparently, several fields, choosing different boost levels (weight) for each. That s where the MultiFieldQueryParser class comes in. It was custom-made for just such a situation. MultiFieldQueryParser is a subclass of QueryParser and as such it inherits its methods. This means that it also has the factory methods necessary to generate the many different types of queries that were listed in the previous section. Moreover, it has additional static parse methods that are the heart and soul of the class. They are:
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static parse(String[] queries, String[] fields, Analyzer analyzer) static Query parse(String[] queries, String[] fields, BooleanClause.Occur[] flags, Analyzer analyzer) static Query parse(String query, String[] fields, BooleanClause.Occur[] flags, Analyzer analyzer)
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It s important that you understand the differences between these methods because they look similar but behave differently. The first parse method accepts an array of query strings and an array of fields plus an analyzer. These arrays function as parallel arrays. That is, query[0] applies to field[0], query[1] applies to field[1], and so on up to query[n] applying to field[n]. When this static method is called to generate a query, all of these queries are limited to being ORed together. This is rather restrictive. What if we wanted to utilize the parser to AND or maybe even NOT a query in the same set of queries That s where the other two parse methods come in.
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Building custom queries programmatically
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The second parse method accepts the query and field arrays just like the first one did, but it also accepts another array of type BooleanClause.Occur that determines whether queries are ANDed, Ored, or NOTed. Therefore, all bases are covered with the addition of this third array. Section 7.3.6 will have an example of these BooleanClause.Occur types. The third and final parse method is almost exactly like the second one except that, since it has only one query instead of an array of them, that query is applied across all the fields specified in the array of field names. Figure 7.8 shows an admittedly simplistic screen that could be used to gather the description and title terms that are utilized in listing 7.4. This should give you a frame of reference as to what we re trying to demonstrate in the listing.
Figure 7.8 The example screen that could possibly gather the data given in listing 7.4
An example of the MultiFieldQueryParser class in listing 7.7 demonstrates the first listed parse method.
Listing 7.7 Utilizing the MultiFieldQueryParser class
public class TestMultiField extends SearchTestCase { String[] titles = new String[]{"The Nun's Story", "Toy Story", "The Philadelphia Story", "Toy Story 2", "Ever After - A Cinderella Story", "Dodgeball - A True Underdog Story", "The Miracle Maker - The Story of Jesus", "Films of Faith Collection", "Dragonfly"}; String[] descs = new String[]{"", "", "", "", "", "", "", "Fred Zinneman's epic The Nun's Story", "Belief gets us there explains nun Linda Hunt"}; @Test public void testMultiFieldQueryParser() throws Exception { FullTextSession session = Search.getFullTextSession(openSession()); Transaction tx = session.beginTransaction();
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