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To allow Java objects to be represented as tables in a relational database, it is necessary to create a mapping between the database objects and the Java classes. When Hibernate is configured, it reads in the mapping information and uses this to build a model in memory representing these relationships. The Hibernate mappings can be supplied in two ways: as proprietary XML files, or using Java 5 annotations. My example application uses Java 5 annotations. I do not use the Hibernate XML mapping approach because it is considerably more verbose and less transparent than the annotationsbased approach. Listing 4-11 shows the UserAccount entity from Listing 4-1 with appropriate annotations added for my Hibernate implementation.

PhoneList now becomes a virtual table, and we can use it like one of our real tables in other queries. We just need to remember that the virtual table is created on the fly by running the query on the permanent Member table and is then gone. To get our phone list now, we can use the SQL statement in Listing 2-14.

<my:DataGrid x:Name="grid" Margin="10" AutoGenerateColumns="False"> <my:DataGrid.Columns> </my:DataGrid.Columns> </my:DataGrid> You can place three types of columns within a Columns collection: a text column (DataGridTextColumn), a check box column (DataGridCheckBoxColumn), and a template column (DataGridTemplateColumn). All of the column types inherit from type DataGridColumn. A number of notable properties apply to all three column types, as shown in Table 5-1. Table 5-1. DataGridColumn Properties

package com.apress.timesheets.entity; import import import import static javax.persistence.CascadeType.PERSIST; static javax.persistence.FetchType.LAZY; java.util.*; javax.persistence.*;

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In the queries we looked at in the previous sections, we used very simple conditions or criteria for determining whether to include a row in the result of a query. We looked at the

Turns on and off the ability for the user to drag columns to reorder them Turns on or off the ability for the user to resize the column s width with the mouse Determines the order in which the column appears in the DataGrid Defines the content of the column s header Determines if the column can be edited by the user Sets the maximum column width in pixels Sets the minimum column width in pixels Determines whether or not the column will be visible to the user Sets the width of the column, or can be set to automatic sizing mode

@Entity @NamedQueries( { @NamedQuery(name query = @NamedQuery(name query = })

value in just one field, such as MemberType = 'Junior'. In the following section, we will look more closely at the different ways you can specify quite complicated conditions.

The DataGridTextColumn defines a column in your grid for plain text. This is the equivalent to BoundColumn in the ASP.NET DataGrid. The primary properties that can be set for a DataGridTextColumn are the Header, which defines the text that will be displayed in the columns header, and the DisplayMemberBinding property, which defines the property in the data source bound to the column. The following example defines a text column with the header Name and is bound to the data source s Name property.

= "getUserAccountByName", "from UserAccount where accountName = :name"), = "listUserAccountByName", "from UserAccount order by accountName")

A condition is a statement or expression that is either true or false, such as MemberType = 'Junior'. These types of expressions are called Boolean expressions after the 19th-century English mathematician George Boole who investigated their properties. The conditions we use to select rows from a table usually involve comparing the values of an attribute to some constant value. For example, we can ask whether the value of an attribute is the same, different, or greater than some value. Table 2-1 shows some comparison operators we can use in our queries.

<my:DataGrid x:Name="grid" Margin="10" AutoGenerateColumns="False"> <my:DataGrid.Columns> <my:DataGridTextColumn Header="Name" DisplayMemberBinding="{Binding Name}" /> </my:DataGrid.Columns> </my:DataGrid>

5=5, 'Junior' = 'Junior' 4<5, 'Ann' < 'Zebedee' 4<=5, 5<=5 5>4, 'Zebedee' > 'Ann' 5>=4, 5>=5 5<>4, 'Junior' <> 'Senior'

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