Oracle DELETE, INSERT, and UPDATE
Internally,
PowerBuilder processes DELETE, INSERT, and UPDATE statements the
same way. PowerBuilder inspects them for any PowerScript variable
references and replaces all references with a constant that conforms
to Oracle rules for the data type.
Example
Assume you enter the following statement:
|
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DELETE FROM employee WHERE emp_id = :emp_id_var; |
In this example, emp_id_var is a PowerScript
variable with the data type of integer that has been defined within
the scope of the script that contains the DELETE statement. Before
the DELETE statement is executed, emp_id_var is assigned
a value (say 691) so that when the DELETE statement executes, the database
receives the following statement:
|
1 |
DELETE FROM employee WHERE emp_id = 691; |
When is this substitution technique used?
This variable substitution technique is used for all PowerScript
variable types. When you use embedded SQL, precede all PowerScript
variables with a colon ( : ).