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For our discussion on joins, we ll use a sample schema that includes some tables in our fictional toy store e-commerce application, which we ve used in the examples in previous chapters Figure 7-1 shows the E-R diagram for all the tables In Figure 7-1, we ve indicated primary keys using bold print, and foreign key relationships using italics If you re unsure about how to read the diagram, refer to 1, where E-R diagramming is explained Take some time to review the diagram, and understand the business rules implied through it For instance, looking at the relationship between Product, Category, and Product2Category, you might say that an existing business rule denotes A Product must belong to one or more Category elements Likewise, a Category can contain one or more Product elements Additionally, a Category may have a single parent Category, thus making it a child of that Category.

1. The user clicks a control (or a specific region inside a control) and holds down the mouse button. At this point, some information is set aside, and a drag-and-drop operation begins. 2. The user moves the mouse over another control. If this control can accept the current type of content (for example, a picture or text), the mouse cursor changes to a special drag-and-drop icon. Otherwise, the mouse cursor becomes a circle with a line drawn through it. 3. When the user releases the mouse button, the control receives the information and decides what to do with it. The operation should also be cancelable by pressing the Esc key (without releasing the mouse button). Unlike the fake drag-and-drop example, a real drag-and-drop operation can easily take place between controls, or even two different applications, as long as the drag-and-drop contract is followed. The example program shown in Figure 4-12 uses drag-and-drop to take a picture from a label control and draw it onto a picture box control. You ll find the complete code with the samples for this chapter under the project name AuthenticDragAndDrop.

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Let s look at how we can pass data in the opposite direction now. To return data, we simply declare output parameters (that is, parameters with the Direction set to ParameterDirection.Output). In PL/SQL, the INTO keyword allows you to set the value of a parameter, as shown in the following example:

The following are some items to note about our sample schema: We haven t shown the data types for columns because we re focusing on the relationships between the entities, not necessarily their makeup When necessary, we ll talk about specific data type concerns in your SQL code Assume all fields are NOT NULL unless noted For the table representing a many-to-many relationship, we ve used the number 2 between the related tables to indicate this more fully: Product2Category This schema is clearly not intended to represent an optimal or full e-commerce database application For brevity, we ve omitted a number of columns, tables, and relationships that would be present in a real-world schema The table structures shown are designed for our examples, nothing more For our CustomerOrderItem table, which represents the products contained in the customer s order, we ve created redundant price and weight columns.

Figure 4-12. A sample drag-and-drop application The first step is to configure the picture box control to accept dropped information. picDrawingArea.AllowDrop = true; To start the drag-and-drop, you can use the DoDragDrop() method of the source control. In this case, it is one of three labels. Dragging is initiated in the MouseDown event for the label. private void lbl_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e) { Label lbl = (Label)sender; lbl.DoDragDrop(lbl.Image, DragDropEffects.Copy); }

SELECT COUNT(*) INTO :1 FROM Products; END; The INTO :1 syntax allows you to return a value from an anonymous PL/SQL block. Let s try out this technique by writing some code to retrieve the total number of records in the Products table using an anonymous PL/SQL block. Create a new form, and place a button named btnRetrieveData on the form. In the click event of this button, write the code shown in Listing 5-3. Listing 5-3. Returning Data Via an Anonymous PL/SQL Block

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