ColdFusion Developer's Guide

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Beta Beta Beta Beta Beta Beta Beta Beta Beta Beta Creating an update form The following are the key differences between an update form and an insert form: ■ An update form contains a reference to the primary key of the record that is being updated. A primary key is a field(s) in a database table that uniquely identifies each record. For example, in a table of employee names and addresses, only the Emp_ID is unique to each record. ■ An update form is usually populated with existing record data. The easiest way to designate the primary key in an update form is to include a hidden input field with the value of the primary key for the record you want to update. The hidden field indicates to <strong>ColdFusion</strong> which record to update. To create an update form: 1. Create a <strong>ColdFusion</strong> page with the following content: Update Form SELECT * FROM Employee WHERE Emp_ID = #URL.Emp_ID# First Name: Last Name: Department Number: 590 Updating Your Database
Beta Beta Beta Beta Beta Beta Beta Beta Beta Beta Start Date: Salary: Contractor: Yes Yes 2. Save the file as update_form.cfm. 3. View update_form.cfm in your web browser by specifying the page URL and an Employee ID; for example, enter the following: http://localhost/myapps/update_form.cfm?Emp_ID=3 NOTE Although you can view an employee’s information, you must code an action page before you can update the database. For more information, see “Creating an action page to update data” on page 593. Updating data 591
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Beta Contents Introduction . . . .
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Beta Chapter 8: Creating ColdFusion
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Beta About resource and sandbox sec
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Index A access client variables 412
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authentication application-based ex
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cfexit tag about 43 behavior of 296
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SetVariable 103 StructClear 134 Str
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caching 1144 curve chart considerat
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web services and 1306 when to use 2
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forms for updating 584 insert form
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adding custom header 1428 attachmen
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in user-defined functions 222 infor
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esponding to messages from ColdFusi
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Internet applications 19 ColdFusion
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functions for 502 generating multi-
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described 1539 example 1544 onIncom
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unions 609 user guide 609 using 599
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text 1470 retrieving, e-mail messag
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about 37, 74, 324, 400, 404, 417 bu
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web services, consuming 1319 web se
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V validating data types 83 form fie
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type conversions 1304 web services,
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