in the Link field in Java

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in the Link field
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Defining the URL parameter to pass to the confirmation page
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After you create a delete link that opens the confirmation page (which you can read about in the preceding section), you want to modify that link so that it passes the identity of the record that the user wants to delete To define the URL parameter that identifies which record to delete, follow these steps:
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1 Follow Steps 1 through 6 in the Creating delete links to open the confirmation page section, earlier in this chapter The deletion process follows a parallel pattern to the record update
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Building Pages to Delete a Record
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2 Click the plus (+) button to add another parameter
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An empty row appears in the list
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Book IX 4
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Developing Record Update and Delete Pages
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3 Enter the name of a column that describes which record is about to be
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deleted on the confirmation page For the employee table example, we am using the last name field In a real-world situation, you would probably want to add more fields to confirm the deletion But for this purpose, the last name field works fine Figure 4-11 shows the two parameters for the employee table
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Figure 4-11: The Parameters dialog box with the key field and descriptive field
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4 Click OK to close the Parameters dialog box
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The Select File dialog box appears with an updated value in the URL field The value in this field varies depending on your dynamic page type
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5 Click OK to close the Select File dialog box
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The Document window shows the new link
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6 Save the results page
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The results page is complete The delete link now appears on the page, as shown in Figure 4-12
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Building the confirmation page
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The Confirmation page simply displays enough information to identify the record that s about to be deleted This page consists of a form with a confirmation button To create a page that confirms the record deletion, you need to send two parameters to the confirmation page: The record ID A field to display the name of that record This page saves you from having to create another recordset with a filter to look up information that s already been retrieved from the database
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Building Pages to Delete a Record
Figure 4-12: The Document window with the new Delete link
Follow these steps to create the confirmation page:
1 Open up your confirmation page
We opened up confirmphp
2 In the Bindings panel, click the plus (+) button and select URL
Parameter from the list that appears The URL Variables dialog box appears
3 In the Name field, enter the name of the database column that is the key
For the example, we entered empid because we need to create a binding for the URL parameter empid
4 Click OK
The binding is created
5 Repeat Steps 3 and 4 for the last name parameter
For the example, we also created a last_name parameter
6 Choose Insert Form to add a form 7 Choose Insert Form Hidden Field to add a hidden field to store the
record ID The user doesn t need to see the empid, but that ID needs to be part of the form submission
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8 With the hidden field selected, enter the name of the variable in the
Hidden Field text box in the Properties inspector For example, we entered empid_field
Developing Record Update and Delete Pages
9 Click the Bind to Dynamic Source (lightning bolt) button next to the
Value field The Dynamic Data dialog box appears
10 Select the type of binding (URL Parameter, for example) from the
bindings list For the example, we selected the empid URL parameter You can leave the other fields set to their defaults
11 Click OK to close the Dynamic Data dialog box
In the Properties inspector, Dreamweaver updates the Value field with dynamic code to place the URL parameter into the hidden form field
12 Click in the hidden field in the form and type Do you wish to delete
the record for This text tells users they re about to delete a record
13 Position your cursor just before the question mark and then select
Dynamic Text from the plus (+) menu of the Server Behaviors panel The Dynamic Text dialog box appears, as shown in Figure 4-13
14 Select the empid URL Parameter from the list and then click OK
If you re using a different column as the key, select that parameter instead
15 Choose Insert Form Button to add a Submit button to your form
The Input Tag Accessibility Attributes dialog box appears
Figure 4-13: The Dynamic Text dialog box
Building Pages to Delete a Record
16 17 18 19
Type delete_btn in the ID field Click OK to close the dialog box Select the button In the Properties inspector, enter Delete in the Value field The button s text changes to Delete, as shown in Figure 4-14
Figure 4-14: The complete page with Delete button defined
20 Save the page
Use the name that you selected when creating the Delete link (see Creating delete links to open the confirmation page, earlier in this chapter) But wait, there s more! The page isn t complete yet because it can t actually process the deletion You need to add logic to delete the record, as described in the following section
Adding logic to delete the record
Dreamweaver adds the logic to perform the database deletion with the Delete Record server behavior To add this behavior to the HTML form, follow these steps:
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1 In the Server Behaviors panel, click the plus (+) button and select
Delete Record from the menu that appears The Delete Record dialog box appears
Developing Record Update and Delete Pages
2 Select Primary Key Value from the First Check If Variable Is Defined
drop-down list
3 Select the appropriate database connection from the Connection dropdown list This field may appear differently depending on your dynamic page code type
4 Select the table that you want to delete from the Table drop-down list 5 Select the primary key column from the Primary Key Column dropdown list We left the Numeric check box checked in our example because the empid record is a numeric field
6 Select Form Variable from the Primary Key Value drop-down list
Form Variable is the hidden field value from the form submission
7 In the text field next to the Primary Key Value drop-down list, enter
the name of the field that contains the key value Again, we entered empid_field for the example
8 In the After Deleting, Go To text box, enter the page that you want to
open after deleting the record We entered successphp for the example You can make this page as simple as the statement Deleted Successfully The Delete Record dialog box for the example looks like Figure 4-15
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