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78 lines
1.4 KiB
Plaintext
78 lines
1.4 KiB
Plaintext
------------------
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Exception handling
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------------------
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The common syntax rules for EXCEPTION statement is:
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EXCEPTION [[name] [value]];
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Run-time exception messages (FB 1.5)
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------------------------------------
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Function:
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Allows to throw exceptions with text message
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defined at runtime.
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Author:
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Dmitry Yemanov <yemanov@yandex.ru>
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Syntax rules:
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EXCEPTION <exception_name> <message_value>;
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Scope:
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PSQL
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Example(s):
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1. EXCEPTION E_EXCEPTION_1 'Error!';
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2. EXCEPTION E_EXCEPTION_2 'Wrong type for record with ID=' || new.ID;
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Exception re-raise semantics (FB 1.5)
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-------------------------------------
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Function:
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Allows to re-initiate catched exception.
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Author:
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Digitman <digitman@hotbox.ru>
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Syntax rules:
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EXCEPTION;
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Scope:
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PSQL, context of the exception handling block
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Example(s):
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BEGIN
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...
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WHEN SQLCODE -802 THEN
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EXCEPTION E_ARITH_EXCEPT;
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WHEN SQLCODE -802 THEN
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EXCEPTION E_KEY_VIOLATION;
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WHEN ANY THEN
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EXCEPTION;
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END
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Note(s):
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Evaluates to no-op if used outside the exception handling block.
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Run-time error codes (FB 1.5)
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-----------------------------
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Function:
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Allows to get a numeric error code for the catched exception.
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Author:
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Dmitry Yemanov <yemanov@yandex.ru>
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Syntax rules:
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SQLCODE / GDSCODE;
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Scope:
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PSQL, context of the exception handling block
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See also:
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README.context_variables
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