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Listing 4-15. SQL Statement to Retrieve Members with Handicaps Less Than the Average SELECT * FROM Member m WHERE m.Handicap < (SELECT AVG(Handicap) FROM Member)

final ParameterizedRowMapper<UserAccount> userMapper = new ParameterizedRowMapper<UserAccount>() { public UserAccount mapRow(ResultSet rs, int rowNum) throws SQLException { UserAccount account = new UserAccount(); account.setId(rs.getLong("id")); account.setAccountName(rs.getString("accountName")); return account; } }; The implementation in Listing 4-6 receives a populated result set and creates a single instance of the entity in question. Typically, the row number is not used, although it is sometimes useful when ordered selections require an associated surrogate index. The mapper abstracts the population of the entity from a set of columns into a single well-defined implementation. We can then use this with other helper methods from the JdbcTemplate class, as shown in Listing 4-7.

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In the previous example, you allowed the DataGrid to automatically generate columns based on the data to which it was bound. This is not a new concept it has been around in data grid components since the initial release of ASP.NET. But what if you want to have some additional control over the columns that are created in your DataGrid What if you want to add a column that contains some more complex information, such as an image You can do this by first setting the AutoGenerateColumns property on the grid to false. Then you need to generate the columns manually. Columns are defined in a DataGrid using the Columns collection. The following is an example of setting the Columns collection in XAML. Notice that it sets the AutogenerateColumns property to False. If you neglect to do this, you will get all of the autogenerated columns in addition to the columns you define within the Columns collection.

If you take it nice and slowly, you can gradually build up quite complicated queries. Say we want to see whether any junior members have a lower handicap than the average for seniors. The inner query has to return the average value handicap for a senior member, and then we want to select all juniors with a handicap less than that. Both the inner and outer queries have an extra select condition (the inner retrieves just seniors, and the outer retrieves just juniors). Listing 4-16 shows one way of doing this.

As you ve seen, the Canvas panel is a simple layout control. It can be used very effectively in a fixed layout. However, in most cases, you will want to use a static layout for your applications. The StackPanel control provides a more fluid layout control.

public List<UserAccount> list() { final List<UserAccount> list = getTemplate().query(SELECT_ACCOUNTS, userMapper); for(final UserAccount account : list) { populateRoles(account); } return list; }

Listing 4-16. SQL Statement to Retrieve Juniors with Handicaps Less Than the Average Senior SELECT * FROM Member m WHERE m.MemberType = 'Junior' AND Handicap < (SELECT AVG(Handicap) FROM Member WHERE MemberType = 'Senior')

The StackPanel provides developers with a quick layout option for positioning objects. The StackPanel control allows you to position Silverlight objects in more of a flow layout, stacking objects either horizontally or vertically. Figure 3-7 shows the basic concept of this layout control.

The JdbcDaoSupport class requires a DataSource to be provided, so this must be configured first. For this example, we will use a DriverManagerDataSource, which is a simple wrapper to allow a basic DataSource implementation to be created by injecting the Connection properties directly. Listing 4-8 shows the configuration of a data source for an in-memory HSQL database (an embedded Java database that runs within the same JVM as your application logic).

This is where we started this chapter. When we use the IN keyword, SQL will expect to find a set of single values. For example, we might ask for rows from the Entry table for members with IDs IN a set of values. In Listing 4-17 the inner query selects the IDs of all senior members, and the outer query returns the entries for those members.

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