Oracle Raise Error In Trigger
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user-defined exceptions whose names you decide. Syntax raise_statement ::= Description of the illustration oracle trigger example raise_statement.gif Keyword and Parameter Descriptions exception_name A predefined or triggers in oracle 11g user-defined exception. For a list of the predefined exceptions, see Predefined PL/SQL Exceptions. oracle trigger tutorial Usage Notes Raise an exception in a PL/SQL block or subprogram only when an error makes it impractical to continue processing. You can
Types Of Triggers In Oracle
code a RAISE statement for a given exception anywhere within the scope of that exception. When an exception is raised, if PL/SQL cannot find a handler for it in the current block, the exception propagates to successive enclosing blocks, until a handler is found or there oracle trigger after update are no more blocks to search. If no handler is found, PL/SQL returns an unhandled exception error to the host environment. In an exception handler, you can omit the exception name in a RAISE statement, which raises the current exception again. This technique enables you to take some initial corrective action (perhaps just logging the problem), then pass control to another handler that does more extensive correction. When an exception is reraised, the first block searched is the enclosing block, not the current block. Examples Example 1-16, "Creating a Standalone PL/SQL Procedure" Example 10-3, "Creating the emp_admin Package" Example 11-3, "Scope of PL/SQL Exceptions" Example 11-9, "Reraising a PL/SQL Exception" Related Topics Exception Handler Defining Your Own PL/SQL Exceptions Scripting on this page enhances content navigation, but does not change the content in any way.
occurs. Note: The database can detect only system-defined events. You cannot define your own events. Topics Overview of Triggers Reasons to Use Triggers DML Triggers System Triggers Subprograms Invoked by Triggers Trigger Compilation, Invalidation, and Recompilation Exception oracle trigger after insert Handling in Triggers Trigger Design Guidelines Trigger Restrictions Order in Which Triggers Fire Trigger Enabling
Oracle Trigger When Clause
and Disabling Trigger Changing and Debugging Triggers and Oracle Database Data Transfer Utilities Triggers for Publishing Events Views for Information About Triggers Overview
Instead Of Trigger In Oracle
of Triggers Like a stored procedure, a trigger is a named PL/SQL unit that is stored in the database and can be invoked repeatedly. Unlike a stored procedure, you can enable and disable a trigger, but you https://docs.oracle.com/cd/B28359_01/appdev.111/b28370/raise_statement.htm cannot explicitly invoke it. While a trigger is enabled, the database automatically invokes it—that is, the trigger fires—whenever its triggering event occurs. While a trigger is disabled, it does not fire. You create a trigger with the CREATE TRIGGER statement. You specify the triggering event in terms of triggering statements and the item on which they act. The trigger is said to be created on or defined on the item, which is either a table, a https://docs.oracle.com/cloud/latest/db112/LNPLS/triggers.htm view, a schema, or the database. You also specify the timing point, which determines whether the trigger fires before or after the triggering statement runs and whether it fires for each row that the triggering statement affects. By default, a trigger is created in the enabled state. For more information about the CREATE TRIGGER statement, see "CREATE TRIGGER Statement". If the trigger is created on a table or view, then the triggering event is composed of DML statements, and the trigger is called a DML trigger. For more information, see "DML Triggers". If the trigger is created on a schema or the database, then the triggering event is composed of either DDL or database operation statements, and the trigger is called a system trigger. For more information, see "System Triggers". A conditional trigger has a WHEN clause that specifies a SQL condition that the database evaluates for each row that the triggering statement affects. For more information about the WHEN clause, see "WHEN (condition)". When a trigger fires, tables that the trigger references might be undergoing changes made by SQL statements in other users' transactions. SQL statements running in triggers follow the same rules that standalone SQL statements do. Specifically: Queries in the trigger see the current read-consistent materialized view of referenced tables and any data changed in the same transaction. Updates in the trigger
FunctionsRegular Expressions FunctionsStatistical FunctionsLinear Regression FunctionsPL SQL Data TypesPL SQL StatementsPL SQL OperatorsPL SQL ProgrammingCursorCollectionsFunction Procedure PackagesTriggerSQL PLUS Session EnvironmentSystem Tables Data DictionarySystem PackagesObject OrientedXMLLarge ObjectsTransactionUser PrivilegeRaise application error in a trigger http://www.java2s.com/Tutorial/Oracle/0560__Trigger/Raiseapplicationerrorinatriggerincaseofinvalidnewvalue.htm in case of invalid new value : NEW OLD«Trigger«Oracle PL/SQL TutorialOracle PL/SQL TutorialTriggerNEW OLDSQL> SQL> create table t ( x int ); Table created. SQL> SQL> create trigger t_trigger before insert on t for each row 2 begin 3 for x in ( select * 4 from dual oracle trigger 5 where :new.x > 10) 6 loop 7 raise_application_error( -20001, 'check failed' ); 8 end loop; 9 end; 10 / Trigger created. SQL> show errors No errors. SQL> SQL> insert into t select 1 from all_users; 15 rows created. SQL> SQL> set autotrace traceonly statistics SQL> SQL> insert into triggers in oracle t select 1 from all_users; 15 rows created. Statistics ---------------------------------------------------------- 16 recursive calls 15 db block gets 73 consistent gets 0 physical reads 0 redo size 924 bytes sent via SQL*Net to client 947 bytes received via SQL*Net from client 6 SQL*Net roundtrips to/from client 1 sorts (memory) 0 sorts (disk) 15 rows processed SQL> SQL> set autotrace off SQL> SQL> drop table t; Table dropped. SQL> SQL> SQL> 28.3.NEW OLD28.3.1.Old and new value28.3.2.Reference new value with :NEW in a before insert or update trigger28.3.3.Refernece an old value in :OLD after update trigger28.3.4.:old and :new Pseudo-records, Example 128.3.5.:old and :new Pseudo-records, Example 228.3.6.Raise application error in a trigger in case of invalid new value28.3.7.REFERENCING OLD AS old NEW AS new28.3.8.REFERENCING OLD AS old_values NEW AS new_values28.3.9.Output new and old value in a before update triggerjava2s.com |Email:info at java2s.com|© Demo Source and Support. All rights reserved.