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This creates a VARRAY that can contain a maximum of 3,000 elements of ten-character strings. Next, create the following stored procedure to loop through the array and delete the corresponding products:

Tip Nothing prevents you from deriving a custom ListView that supports data binding. You can find an

implementation of this labor-intensive job at http://msdn.microsoft.com/library/en-us/dnadvnet/ html/vbnet08262002.asp. However, because the DataGridView provides almost all the functionality of the ListView and many more features, it s usually the better route.

Listing 7-22. Example of a Natural Join mysql> SELECT p2c.category_id -> FROM Product p -> NATURAL JOIN Product2Category p2c -> WHERE p.product_id = 2; +-------------+ | category_id | +-------------+ | 2 | +-------------+ 1 row in set (0.11 sec) mysql> SELECT p2c.category_id -> FROM Product p -> INNER JOIN Product2Category p2c ON p.product_id = p2c.product_id -> WHERE p.product_id = 2; +-------------+ | category_id | +-------------+ | 2 | +-------------+ 1 row in set (0.00 sec) Likewise, using NATURAL LEFT JOIN would do an outer join based on any identically named columns in both tables. We generally discourage the use of NATURAL JOIN, because it leads to less specificity in your SQL code.

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BEGIN FOR i IN 1..arrProduct.LAST LOOP DELETE FROM Products WHERE ID = arrProduct(i); END LOOP; END; The VARRAY is also different from associative arrays in that it can be considered a custom data type. You cannot receive a VARRAY directly from the OracleParameter.Value property as you did earlier for associative arrays. To be able to use it in your code, you will need to create a .NET class that encapsulates this array. Listing 5-10 does that for you, creating the ProductVArray class referenced by the stored procedure. This class will also need to implement the IOracleCustomType interface so that it can be recognized by Oracle.

While the ListView is most commonly used to create grids, it actually supports five distinct modes that you ve probably already seen in Windows Explorer. You specify the mode by setting the ListView.View property to one of the values from the View enumeration, as listed in Table 6-1.

Just like NATURAL JOIN, the USING keyword is simply an alternate way of expressing the ON condition for some joins. Instead of ON tableA.column1 = tableB.column1, you could write USING (column1). Listing 7-23 shows an example that uses the USING keyword. Listing 7-23. Example of the USING Keyword mysql> SELECT p2c.category_id -> FROM Product p -> INNER JOIN Product2Category p2c USING (product_id) -> WHERE p.product_id = 2; +-------------+ | category_id | +-------------+ | 2 | +-------------+ 1 row in set (0.00 sec)

When a node is selected, a generic code routine reads the accompanying DataRow and displays all the information it contains in a label. (This code reacts to the TreeView.AfterSelect event.) private void treeDB_AfterSelect(object sender, TreeViewEventArgs e) { lblInfo.Text = string.Empty; DataRow row = (DataRow)e.Node.Tag; StringBuilder sb = new StringBuilder(); foreach (object field in row.ItemArray) { sb.Add(field.ToString()); sb.Add("\n"); } lblInfo.Text = sb.ToString(); } The result, shown in Figure 8-31, is a TreeView that has easy access to the information for each node.

using System;

The preceding TreeView example requires very little information about the data source. Instead, it loops through the available fields to display a list of information. However, in doing so the control also gives up the ability to show the data in a more acceptable format. For example, fields that aren t important are always displayed, and the field order is fixed. There is an elegant way to solve this problem. The next example shows a TreeView that still embeds data, but relies on the StoreDB class to transform the DataRow fields into display information (see Figure 8-32). Thanks to this approach, the TreeView doesn t need to handle the table hierarchy.

The use of USING is primarily related to style preference. If you re concerned about portability issues, however, you may want to stay away from this nonstandard syntax. If not, just decide which style of syntax you want to adopt, and adhere to that single style.

using using using using System.Data; System.Collections; Oracle.DataAccess.Client; Oracle.DataAccess.Types;

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