Oracle if inserting or updating


17-Dec-2014 20:52

oracle if inserting or updating-69

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Constraints are declaractions of conditions about the database that must remain true.These include attributed-based, tuple-based, key, and referential integrity constraints.Programmers must use the WHENEVER statement and/or check the SQLCA contents (Pro*C users) or catch the exception SQLException (JDBC users) in order to get the error code returned by Oracle.Some vendor specific error code numbers are 1 for primary key constraint violations, 2291 for foreign key violations, 2290 for attribute and tuple CHECK constraint violations.The Oracle implementation of constraints differs from the SQL standard, as documented in Oracle 9i SQL versus Standard SQL.Triggers are a special PL/SQL construct similar to procedures.The WHEN clause or body of the trigger can check for the violation of certain conditions and signal an error accordingly using the Oracle built-in function RAISE_APPLICATION_ERROR.However, a procedure is executed explicitly from another block via a procedure call, while a trigger is executed implicitly whenever the triggering event happens.

oracle if inserting or updating-69

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Oracle also provides simple error message strings that have a format similar to the following: For more details on how to do error handling, please take a look at Pro*C Error handling or at the Retrieving Exceptions section of JDBC Error handling.Below is the syntax for creating a trigger in Oracle (which differs slightly from standard SQL syntax): Triggers can often be used to enforce contraints.



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