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public class UserAccount { private Long id; private String accountName; private Set<UserRole> roles = new HashSet<UserRole>(); public UserAccount() { } public UserAccount(final String accountName) { this.accountName = accountName; } @Id @GeneratedValue public Long getId() { return id; } public void setId(final Long id) { this.id = id; } @ManyToMany(fetch = LAZY, cascade = PERSIST) @JoinTable(name = "account_role", joinColumns = { @JoinColumn(name = "user") }, inverseJoinColumns = { @JoinColumn(name = "role") }) public Set<UserRole> getRoles() { return roles; } public void setRoles(final Set<UserRole> roles) { this.roles = roles; } @Column(unique = true, nullable = false) public String getAccountName() { return accountName; } public void setAccountName(String accountName) { this.accountName = accountName; } }

As you would expect, the DataGridCheckBoxColumn contains a check box. If you have data that you want to display as a check box in your grid, this is the control to use. Here is an example of the DataGridCheckBoxColumn that contains the header Male and is bound to the data source s Male property: <my:DataGrid x:Name="grid" Margin="10" AutoGenerateColumns="False"> <my:DataGrid.Columns> <my:DataGridCheckBoxColumn Header="Male " DisplayMemberBinding="{Binding Male}" /> </my:DataGrid.Columns> </my:DataGrid>

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Just a quick note of caution. In Table 2-1, some of our examples compare numbers, and some compare text. When we compare text attributes, the comparison is alphabetical. A comes before Z , so A < Z . Similarly, Ann comes before Azaria alphabetically, so Ann < Azaria, and so on. Recall from 1 that when we create a table, we specify the type of each field; for example, MemberID was an INT (integer or whole number), and LastName was CHAR(20) (a 20-character field). With numeric fields like INT, comparisons are numerical. With text or character fields, comparisons are alphabetical, and with date and time fields, comparisons are chronological. If we put numbers in a character field, they will sort alphabetically. This means you have things like 40 < 5 (because the first character, 4 , in the left text is less than the first character, 5 , on the right side2). So, make sure if a field in your table is going to contain numbers that you make it a numeric type, or you might get some rather surprising results from your queries.

There are two types of annotations available to Hibernate. For the basic mapping information, Hibernate takes advantage of standard JPA annotations in the javax.persistence package namespace. A Hibernate entity mapped exclusively by using these annotations can be supported by other JPA-compliant ORM tools. Hibernate also offers a set of Hibernatespecific annotations that can be used to enable additional Hibernate features. Although we are using a Hibernate-specific set of Spring implementation classes, my implementation does not require any Hibernate-specific annotations.

If you want data in your grid column that is not plain text and is not a check box, the DataGridTemplateColumn provides a way for you to define the content for your column. The DataGridTemplateColumn contains a CellTemplate and CellEditingTemplate, which determine what content is displayed, depending on whether the grid is in normal view mode or in editing mode. Note that while you get features such as automatic sorting in the other types of DataGrid columns, that is not true of the DataGridTemplateColumn. These columns will need to have additional logic in place to allow for sorting. Let s consider an example that has two fields: FirstName and LastName. Suppose that when you are in normal view mode, you want the data to be displayed side by side in TextBlock controls. However, when the user is editing the column, you want to display two TextBox controls that allow the user to edit the FirstName and LastName columns independently. <my:DataGridTemplateColumn Header="Name"> <my:DataGridTemplateColumn.CellTemplate> <DataTemplate> <StackPanel Orientation="Horizontal"> <TextBlock Padding="5,0,5,0" Text="{Binding FirstName}"/> <TextBlock Text="{Binding LastName}"/> </StackPanel> </DataTemplate> </my:DataGridTemplateColumn.CellTemplate> <my:DataGridTemplateColumn.CellEditingTemplate> <DataTemplate> <StackPanel Orientation="Horizontal">

2. The comparison for text is generally done by comparing the Unicode values of each character in turn. The character 4 has a value of 52, and 5 has a value of 53.

<TextBox Padding="5,0,5,0" Text="{Binding FirstName}"/> <TextBox Text="{Binding LastName}"/> </StackPanel> </DataTemplate> </my:DataGridTemplateColumn.CellEditingTemplate> </my:DataGridTemplateColumn> Now that we have covered the basics of manually defining the grids in a DataGrid, let s try it out.

The @Entity annotation marks the class as being an entity for persistence into the database. Optionally, the annotation can supply the default name for the table that the entity will be mapped to.

Another type of inner query is the one we saw working with the EXISTS keyword. A statement using EXISTS just looks to see whether any rows at all are returned by the inner query. The actual values or number of rows returned are not important. Listing 4-18 returns any rows from the Member table where we can find a matching row (with the same value for MemberID) in the Entry table.

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