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With criteria queries, you can specify a projections method call that takes a closure and provides support for these types of queries. Instead of criteria, however, the method calls within it map to another Hibernate class named org.hibernate.criterion.Projections. Let s adapt the example in Listing 10-14 by adding a projection that results in counting the distinct Album titles in the Alternative genre. Listing 10-14. Querying with Projections def criteria = Album.createCriteria() def count = criteria.get { projections { countDistinct('name') } songs { eq('genre', 'Alternative') } }



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public void ExtractTextFromPdf(string path) { using (PdfReader reader = new PdfReader(path)) { StringBuilder text = new StringBuilder(); ...

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A PDF rendering engine might output this as 2 separate calls, .... Pdf library (​disclaimer: I work for Bit Miracle) to extract text from PDF files.

Figure 14-21. A cross-reference file created by the example production, but with the Use production numbers as file names option not enabled

An alternative to criteria queries is to pass an instance of the class you re looking for to the find or findAll method. This is an interesting option when used in conjunction with Groovy s additional implicit constructor for JavaBeans, as shown in Listing 10-15. Listing 10-15. Query by Example def album = Album.find( new Album(title:'Odelay') ) As you can see from Listing 10-15, the find method uses the properties set on the passed Album instance to formulate a query. Querying by example is a little limiting, because you don t have access to some of the more advanced expressions such as Like, Between, and GreaterThan when passing in the example. It is, however, another useful addition to your toolbox.





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In the model-driven approach you start with a database schema for the chosen database system, and using a tool like Middlegen or Hibernate Synchronizer, you generate mappings and POJOs for each table being mapped. This approach provides a fast start-up time for development but can potentially leave you with what Martin Fowler refers to as an anemic domain model with very little of the rich semantic that you would expect to find in a domain model. In such cases I sometimes like to think of the resulting model as more of a data-access model which will in turn be used by a richer domain model. Of course the issues of where the persistence interaction lies in your code become a hotly debated topic. Do you have your real domain objects peppered with persistence code in order to manipulate the data-driven table wrappers generated Or do you take the more behavior/data separation model that most J2EE applications follow, where use cases are mapped to say a stateless session bean method which in terms manipulates the data mapper objects generated Figure 4-6 illustrates the data model driven approach.

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Data created in the example outlined in this chapter represents a fully qualified and valid production set. Image data and file path metadata represented by a cross-reference file might be all that s needed for a particular project. However, you can take additional post-production steps to refine production data.

Another way to perform queries is via the Hibernate Query Language (HQL), which is a flexible object-oriented alternative to SQL. A full discussion of HQL is beyond the scope of this book; however, the Hibernate documentation does cover it splendidly at http://www.hibernate.org/ hib_docs/reference/en/html/queryhql.html. We will look at some basic examples of how GORM supports HQL via more built-in methods. Those who know SQL should not find it hard to adapt to HQL, because the syntactic differences are minimal. GORM provides three methods for working with HQL queries: find, findAll, and executeQuery. Each method, when passed a string, will assume it s an HQL query. The example in Listing 10-16 presents the most basic case combined with findAll.

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In a PDF document, contents are often formed by text. If readers think that contents are useful for them or can be takes as template, they may need to extract text ...

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