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In the previous chapter, you learned how to create CouchDB views using map functions When creating views in CouchDB, you must create a map function This function takes a single argument, which is the document itself, and uses the special emit function to produce a result This emit function accepts two arguments: a key and a value Every time the emit function is called, a row is added to the view Whenever a new document is created or an existing document is updated or deleted, the rows in the view are updated automatically Listing 8-1 shows the most basic map function (in this case, I am using the JavaScript view engine) Listing 8-1 A Basic Map Function function(doc) { emit(null, doc); } In this example, you can see that the map function has a single argument doc, which represents the CouchDB document.

{ if(this.value == this.defaultValue) this.value = ''; }).bindAsEventListener(el)); Event.observe(el,'blur',(function() { if(this.value == '') this.value = this.defaultValue; }).bindAsEventListener(el)); } }; new FormField('searchfield'); </script> This example used the Prototype method of creating a class and then attaching the initialize() function to the prototype by specifying it as a method in the object literal. When a new object is instantiated from it, the initialize() function is automatically run. The focus and blur events are observed. For the focus event, if the value contained within is the default value, it will clear the input, enabling the user to type from scratch. Then, on blur, the field is reset to the default value if the field is blank.

In the next three sections, you will look at each of the first three primary key generation strategies outlined in the table.

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The main advantage of the TABLE primary key generation strategy over the others is that it can be used with an underlying database of any type no special features are required. To start with, you create a two-column table in the same database schema where you have created the other underlying tables. In this table, you will store information about custom sequences so that the first column stores a sequence name and the second stores its current value. Listing 9-12 shows how you might create such a table. Listing 9-12. An Underlying Table to Store Information About User-Defined Sequences CREATE TABLE pono_gen_table( gen_name VARCHAR(20) PRIMARY KEY, gen_value NUMERIC(10) ); To set up a new sequence, you have to insert a new row into the previous table. For example, you might insert the following row: INSERT INTO pono_gen_table VALUES('pono_gen', 10); With that done, you have a custom sequence named pono_gen whose initial value is set to 10. Now that you have defined a custom sequence for generating primary keys, you can start using it. Once again, you can create a new project, borrowing the structure from the test project discussed in the Performing a Quick Test of the Newly Created JPA Entities section in 8. Then, modify the Order entity source as shown in Listing 9-13. Listing 9-13. The Order Entity Updated to Use the TABLE Primary Key Generation Strategy package ejbjpa.entities; import java.io.Serializable; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.Id; import javax.persistence.Table; import javax.persistence.Temporal; import static javax.persistence.TemporalType.DATE; import javax.persistence.ManyToOne; import javax.persistence.JoinColumn;

This particular function simply adds every document in the database to the view, with no key defined and the entire document as the value If the database contains documents of different types, you might use a field type to differentiate between different types of documents Consider the example in Listing 8-2, where you emit only those rows that have a type car Listing 8-2 Filtering by Document Type function(doc) { if(doctype == "car") emit(null, { "make": docmake, "model": docmodel, "year": docyear }); } In this example, only those documents that have a type field with the value car will be added to the view Again, each of these documents will be represented by a row with a null key and an object comprising the car s make, model, and year as the value.

jQuery (http://jquerycom) is quick and nimble, and it was the first library that really highlighted the power of method chaining The library is well encapsulated and is guaranteed to play well with other libraries using its own jQuery namespace It offers a dollar sign function that maps to an internal method If you are using jQuery alongside Prototype or another library that makes use of the dollar function, you can turn it off in jQuery jQuery is compact, yet extremely powerful However, it is light in features when it comes to many of the tasks required to handle desktop-like functionality in a web application There s no templating or the capability to work with data sets from within the library If you need to add some interactivity to your site, jQuery is a great solution Here s a quick example that helps demonstrate where jQuery really shines: $("psurprise").

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