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Figure 8-32. A decoupled TreeView The form begins by filling the tree with a list of categories and adds dummy nodes under every level. private void TreeViewForm_Load(object sender, System.EventArgs e) { TreeNode nodeParent; foreach (DataRow row in Program.StoreDB.GetCategories().Rows) { // Add the category node. nodeParent = treeDB.Nodes.Add(row[StoreDB.CategoryField.Name].ToString()); nodeParent.ImageIndex = 0; // Store the disconnected category information. nodeParent.Tag = row; // Add a "dummy" node. nodeParent.Nodes.Add("*"); } } When a node is expanded and the TreeView.BeforeExpand event fires, the code calls the StoreDB with the selected category and requests more information. The StoreDB class then returns the information needed to add the appropriate child nodes. (It s up to you whether this step uses a previously cached product DataTable or fetches it at this exact moment, although the first approach is the fastest.) private void treeDB_BeforeExpand(object sender, TreeViewCancelEventArgs e) { TreeNode nodeSelected, nodeChild; nodeSelected = e.Node;

The access strategy MySQL chooses for your SELECT statements is based on a complex set of decisions made by the join optimizer, which is part of the query parsing, optimization, and execution subsystem (see 4). The EXPLAIN command, introduced in 6, helps you in analyzing the access strategy MySQL chooses in order fulfill your SELECT requests. This will provide you the information you need to determine if MySQL has indeed chosen an optimal path for joining your various data sets or if your query requires some additional tweaking. The EXPLAIN statement s type column2 shows the access type MySQL is using for the query. In order of most efficient access to least efficient, the following are the values that may appear in the type column of your EXPLAIN results: system const eq_ref ref ref_or_null index_merge (new in MySQL 5.0.0) unique_subquery index_subquery range index ALL The system value refers to a special type of access strategy that MySQL can deploy when the SELECT statement is requesting data from a MySQL system (in-memory) table and the table has only one row of data. In the following sections, we ll look at the meaning of each of the other values.

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if (nodeSelected.Nodes[0].Text == "*") { // This is a dummy node. nodeSelected.Nodes.Clear(); foreach (DataRow row in Program.StoreDB.GetProductsInCategory((DataRow)nodeSelected.Tag)) { string field = row[StoreDB.ProductField.Name].ToString(); nodeChild = nodeSelected.Nodes.Add(field); // Store the disconnected product information. nodeChild.Tag = row; nodeChild.ImageIndex = 1; nodeChild.SelectedImageIndex = 1; } } } When an item is selected, the code again relies on the ProductDatabase class to translate the embedded DataRow. In this case, the code responds to the TreeView.AfterSelect event: private void treeDB_AfterSelect(object sender, TreeViewEventArgs e) { lblInfo.Text = Program.StoreDB.GetDisplayText((DataRow)e.Node.Tag); } This pattern allows the StoreDB to handle its own data access strategy it can fetch the information as needed with queries every time a node is expanded, or it can retain it in memory as a private member variable (as it does in this example). Even better, the StoreDB code is extremely simple because it doesn t need to convert ADO.NET objects into business objects. The TreeView can use and embed the ADO.NET objects natively, without needing to know anything about their internal field structures. Here s the full StoreDB code for this example: public class StoreDB { public DataTable GetCategories() { string connectionString = Properties.Settings.Default.Store; SqlConnection con = new SqlConnection(connectionString); SqlCommand cmd = new SqlCommand("GetProducts", con); cmd.CommandType = CommandType.StoredProcedure; SqlDataAdapter adapter = new SqlDataAdapter(cmd); DataSet ds = new DataSet(); adapter.Fill(ds, Tables.Product); cmd.CommandText = "GetCategories"; adapter.Fill(ds, Tables.Category);

public class ProductVArray : IOracleCustomType, INullable { //You will need to define a local array to hold the VARRAY elements. The data //type must correspond to the type declared in the VARRAY. You ve defined a VARRAY //of VARCHAR2(10) values, hence your local array will hold String objects. [OracleArrayMapping()] public String[] Array; //The status array is used to store the status of an array index - whether the //element at the index is a NULL value or not. private OracleUdtStatus[] m_statusArray; public OracleUdtStatus[] StatusArray { get { return this.m_statusArray; } set { this.m_statusArray = value; } } private bool m_bIsNull; public bool IsNull { get { return m_bIsNull; } } public static ProductVArray Null { get { ProductVArray obj = new ProductVArray(); obj.m_bIsNull = true; return obj; } }

2. The MySQL online documentation refers to the type column as the join type. This is a bit of a misnomer, as this column actually refers to the access type, since no actual joins may be present in the SELECT statement. We encourage you to investigate the internals.texi developer s documentation, where this same clarification is made.

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