Pl Sql Trigger Raise Error
However, when the view query gets complex, the system implicitly cannot translate the DML on the view into those on the underlying tables. If the trigger is created on a table or view, then OLD and NEW refer to the current row of the table or view, and PARENT is undefined. For user-defined exceptions, SQLCODE returns +1 and SQLERRM returns the message: User-Defined Exception. The REORDER trigger example shows a trigger that reorders parts as necessary when certain conditions are met. (In other words, a triggering statement is entered, and the PARTS_ON_HAND value is less
Make sure you pass negative error numbers to SQLERRM. SQL> SQL> update employee set salary = 20000; update employee set salary = 20000 * ERROR at line 1: ORA-20999: Salary with commissions should be less than 10000 ORA-06512: at "JAVA2S.EMP_BIU", The inner block does not have an exception handler for C, so exception C propagates to the outer block. You might also use this package when compiling a complex application, made up of several nested SQL*Plus scripts, where different warning settings apply to different subprograms.
Pl Sql Exception Handling Examples
These examples are not meant to be used exactly as written. For more information, see "DML Triggers". For more information about trace files, see Oracle Database Performance Tuning Guide. Bangalore to Tiruvannamalai : Even, asphalt road How to prove that a paper published with a particular English transliteration of my Russian name is mine?
Redeclaring predefined exceptions is error prone because your local declaration overrides the global declaration. An exception name declaration has this syntax: exception_name EXCEPTION; For semantic information, see "Exception Declaration". Example 9-20 AFTER Statement Trigger on Database CREATE TRIGGER log_errors AFTER SERVERERROR ON DATABASE BEGIN IF (IS_SERVERERROR (1017)) THEN NULL; -- (substitute code that processes logon error) ELSE NULL; -- (substitute Raise_application_error In the following example, you call raise_application_error if an error condition of your choosing happens (in this case, if the current schema owns less than 1000 tables): DECLARE num_tables NUMBER; BEGIN
To detect this situation, include a counter variable in the package. Pragma Exception_init IF ... When a user connected as HR tries to drop a database object, the database fires the trigger before dropping the object. 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.
Raise Exception In Oracle
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 https://docs.oracle.com/cd/E11882_01/appdev.112/e25519/errors.htm Example 9-19 creates a BEFORE statement trigger on the sample schema HR. Pl Sql Exception Handling Examples A cursor must be closed before it can be reopened. Oracle Exception When Others You cannot anticipate all possible exceptions, but you can write exception handlers that let your program to continue to operate in their presence.
What is a tire speed rating and is it important that the speed rating matches on both axles? An internally defined exception always has an error code, but does not have a name unless PL/SQL gives it one or you give it one. Unlike internal exceptions, user-defined exceptions must be given names. Example 9-25 Workaround for Example 9-24 CREATE OR REPLACE PROCEDURE insert_row_proc AUTHID DEFINER AS no_remote_db EXCEPTION; -- declare exception PRAGMA EXCEPTION_INIT (no_remote_db, -20000); -- assign error code to exception BEGIN INSERT Sqlerrm
You must raise a user-defined exception explicitly. Example 11-21 Exception Raised in Exception Handler is Handled by Enclosing Block CREATE PROCEDURE descending_reciprocals (n INTEGER) AUTHID DEFINER IS i INTEGER; i_is_one EXCEPTION; BEGIN BEGIN i := n; LOOP IF An INSTEAD OF trigger can read OLD and NEW values, but cannot change them. In Example 11-13, the inner block declares an exception named past_due, for which it has no exception handler.
For more information about the CREATE TRIGGER statement, see "CREATE TRIGGER Statement". Ora-06512 For more information, see "Predefined Exceptions". SYS_INVALID_ROWID The conversion of a character string into a universal rowid fails because the character string does not represent a valid rowid.
For more information, see "INSTEAD OF DML Triggers".
Use AFTER row triggers to obtain the row ID and use it in operations. ALTER SYSTEM SET PLSQL_WARNINGS='ENABLE:ALL'; -- For debugging during development. By default, a trigger is created in the enabled state. You might want to use a FOR or WHILE loop to limit the number of tries.
OLD, NEW, and PARENT are also called pseudorecords, because they have record structure, but are allowed in fewer contexts than records are. Example 9-7 creates the view oe.order_info to display information about customers and their orders. The message begins with the Oracle error code. See the effect on Book_table: SELECT * FROM Book_table ORDER BY Booknum; Result: BOOKNUM SECTION TITLE AUTHOR A ---------- -------------------- -------------------- -------------------- - 121001 Classic Iliad Homer Y 121002 Novel Gone
You can place RAISE statements for a given exception anywhere within the scope of that exception. ROWTYPE_MISMATCH The host cursor variable and PL/SQL cursor variable involved in an assignment have incompatible return types. In Example 11-11, the handling of the exception starts in the inner block and finishes in the outer block. DBMS_OUTPUT.PUT('Try #' || i); BEGIN -- sub-block begins SAVEPOINT start_transaction; -- transaction begins DELETE FROM results WHERE res_answer = 'NO'; INSERT INTO results (res_name, res_answer) VALUES (name, answer); -- Nonunique name
That lets you refer to any internal exception by name and to write a specific handler for it. DBMS_WARNING Package If you are writing PL/SQL units in a development environment that compiles them (such as SQL*Plus), you can display and set the value of PLSQL_WARNINGS by invoking subprograms in When an error occurs, an exception is raised. BEGIN * ERROR at line 1: ORA-01476: divisor is equal to zero ORA-06512: at "HR.DESCENDING_RECIPROCALS", line 19 ORA-06510: PL/SQL: unhandled user-defined exception ORA-06512: at line 2 Example 11-21 is like Example
Triggering statement: UPDATE employees SET salary = salary * 1.05 WHERE department_id IN (10, 20, 90); Result: Whalen: Old salary = 2800, New salary = 2940, Difference: 140 Hartstein: Old salary Caution: The trigger in Example 9-12 does not work with self-referential tables (tables with both the primary/unique key and the foreign key). The structure of a pseudorecord is table_name%ROWTYPE, where table_name is the name of the table on which the trigger is created (for OLD and NEW) or the name of The trigger in Example 9-24 has an INSERT statement that accesses a remote database.
Once the exception name is lost, only an OTHERS handler can catch the exception. In an exception handler, you can omit the exception name in a RAISE statement, which raises the current exception again. dbms_output.put_line('Can''t handle an exception in a declaration.'); END; / Handlers in the current block cannot catch the raised exception because an exception raised in a declaration propagates immediately to the enclosing If a timing-point section is absent, then nothing happens at its timing point.
Except in an INSTEAD OF trigger, a triggering UPDATE statement can include a column list. INVALID_NUMBER In a SQL statement, the conversion of a character string into a number fails because the string does not represent a valid number. (In procedural statements, VALUE_ERROR is raised.) This The exception ORA-04091 (mutating-table error) allows the trigger emp_dept_check to be used with the UPDATE_SET_DEFAULT and UPDATE_CASCADE triggers. However, if the DR unit initiates the triggering event of a schema trigger that user1 owns, then that trigger does not fire.