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The PRAGMA keyword is used to signify
that the remainder of the PL/SQL statement is a pragma, or directive,
to the compiler. Also called apseudoinstruction,
a pragma simply passes information to the compiler rather than
getting transformed into a particular execution.
The syntax for using the PRAGMA keyword is as follows:
PRAGMA instruction;
where
instruction
is a statement providing instructions
to the compiler. The PL/SQL compiler will accept such directives
anywhere in the declaration section.
PL/SQL offers the following pragmas:
-
AUTONOMOUS_TRANSACTION
-
Tells the PL/SQL runtime engine to commit or roll back any changes
made to the database inside the current block without affecting the
main or outer transaction. See
Chapter 13
for more
information. Introduced in Oracle8
i
.
EXCEPTION_INIT
-
Tells the compiler to associate a particular
error number
with an identifier you have declared as an exception in your program.
See
Chapter 6
for more information.
RESTRICT_REFERENCES
-
Tells the compiler the purity level (freedom from side effects) of a
packaged program. See
Chapter 16
for more
information.
SERIALLY_REUSABLE
-
Tells the PL/SQL runtime engine that package-level data should not
persist between references to that data. See
Chapter 17
for more information. Introduced in Oracle8.
The following block demonstrates the use of the EXCEPTION_INIT pragma
to name a built-in exception that would otherwise have only a number.
DECLARE no_such_sequence EXCEPTION; PRAGMA EXCEPTION_INIT ...
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