Raise Error Oracle Trigger

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Exceptions In Triggers

vote 0 down vote favorite Hello fellow programmers and happy new year to you all! I have few university tasks for winter break and one of them is to create trigger on table: PERSON(ID, Name, Surname, Age); Trigger is supposed to inform user when they have inserted row with invalid ID. Vadility criteria is that ID is 11 digits long. I tried to write solution like this: handle exception in trigger CREATE OR REPLACE TRIGGER person_id_trigg AFTER INSERT ON person DECLARE idNew VARCHAR(50); lengthException EXCEPTION; BEGIN SELECT id INTO idNew FROM INSERTED; IF LENGTH(idNew) <> 11 THEN RAISE lengthException; END IF; EXCEPTION WHEN lengthException THEN dbms_output.put_line('ID for new person is INVALID. It must be 11 digits long!'); END; Then I realized that INSERTED exists only in sqlserver and not in oracle. What would you suggest I could do to fix that? Thanks in advance! sql oracle plsql triggers share|improve this question asked Jan 2 '14 at 21:55 Roff 871310 1 Use BEFORE INSERT, not AFTER INSERT. Use FOR EACH ROW clause. Don't execute any query, just check new.id. Read this link for details, there are many examples there: docs.oracle.com/cd/B28359_01/appdev.111/b28370/… –krokodilko Jan 2 '14 at 22:03 Thank you for input, clearly I need to read this documentation in order to understand triggers. –Roff Jan 2 '14 at 22:14 add a comment| 1 Answer 1 active oldest votes up vote 0 down vote accepted Do you want to raise an exception (which would prevent the insert from succeeding)? Or do you want to allow the insert to succeed and write a string to the dbms_output buffer that may or may

user-defined exceptions whose names you decide. Syntax raise_statement ::= Description of the illustration oracle triggers raise_statement.gif Keyword and Parameter Descriptions exception_name A predefined or

Ora-04091

user-defined exception. For a list of the predefined exceptions, see Predefined PL/SQL Exceptions.

Oracle Pl/sql Exception Handling

Usage Notes Raise an exception in a PL/SQL block or subprogram only when an error makes it impractical to continue processing. You can http://stackoverflow.com/questions/20892659/creating-trigger-which-throws-an-exception-on-insert 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 https://docs.oracle.com/cd/B28359_01/appdev.111/b28370/raise_statement.htm 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.

FunctionsRegular Expressions FunctionsStatistical FunctionsLinear Regression FunctionsPL SQL Data TypesPL SQL StatementsPL SQL OperatorsPL SQL ProgrammingCursorCollectionsFunction Procedure PackagesTriggerSQL PLUS Session EnvironmentSystem Tables Data http://www.java2s.com/Tutorial/Oracle/0560__Trigger/RaiseExceptionfromtrigger.htm DictionarySystem PackagesObject OrientedXMLLarge ObjectsTransactionUser PrivilegeRaise Exception from trigger : Introduction«Trigger«Oracle PL/SQL TutorialOracle PL/SQL TutorialTriggerIntroductionSQL> -- create demo table SQL> create http://psoug.org/reference/exception_handling.html table Employee( 2 ID VARCHAR2(4 BYTE) NOT NULL, 3 First_Name VARCHAR2(10 BYTE), 4 Last_Name VARCHAR2(10 BYTE), 5 Start_Date DATE, 6 oracle trigger End_Date DATE, 7 Salary Number(8,2), 8 City VARCHAR2(10 BYTE), 9 Description VARCHAR2(15 BYTE) 10 ) 11 / Table created. SQL> SQL> -- prepare data SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description) 2 values ('01','Jason', 'Martin', raise error oracle to_date('19960725','YYYYMMDD'), to_date('20060725','YYYYMMDD'), 1234.56, 'Toronto', 'Programmer') 3 / 1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description) 2 values('02','Alison', 'Mathews', to_date('19760321','YYYYMMDD'), to_date('19860221','YYYYMMDD'), 6661.78, 'Vancouver','Tester') 3 / 1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description) 2 values('03','James', 'Smith', to_date('19781212','YYYYMMDD'), to_date('19900315','YYYYMMDD'), 6544.78, 'Vancouver','Tester') 3 / 1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description) 2 values('04','Celia', 'Rice', to_date('19821024','YYYYMMDD'), to_date('19990421','YYYYMMDD'), 2344.78, 'Vancouver','Manager') 3 / 1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description) 2 values('05','Robert', 'Black', to_date('19840115','YYYYMMDD'), to_date('19980808','YYYYMMDD'), 2334.78, 'Vancouver','Tester') 3 / 1 row created. SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description) 2 values('06','Linda', 'Green', to_

Functions PSOUG Forum Oracle Blogs Search the Reference Library pages: FreeOracle MagazineSubscriptionsand Oracle White Papers Oracle Exception Handling Version 11.1 General NOTE: How Oracle Does Implicit Rollbacks Before executing an INSERT, UPDATE, or DELETE statement, Oracle marks an implicit savepoint (unavailable to you). If the statement fails, Oracle rolls back to the savepoint. Normally, just the failed SQL statement is rolled back, not the whole transaction. However, if the statement raises an unhandled exception, the host environment determines what is rolled back. If you exit a stored subprogram with an unhandled exception, PL/SQL does not assign values to OUT parameters. Also, PL/SQL does not roll back database work done by the subprogram. At the level of the SQL*Plus prompt, every update/insert/delete has one implicit savepoint, and also the invocation of any unnamed block. Below that, the unnamed block itself has 'sub' savepoints - one foreach insert/update/delete statement in it, and one for each subprogram unit. And so on down the line. If an error occurs, and that error is handled at any level by the time we're back at the SQL*Plus prompt, we only rollback to the immediate savepoint at the start of the update/insert/delete that errors. Otherwise we rollback to the top-level 'virtual' savepoint currently in existence, which is my offending unnamed block. That is, a handled error is handled and so can be dealt with without rolling back all the way to the top. It is handled and the transaction proceeds. Commits define the end of a transaction (and start of a new one) - rollbacks only define the end of a transaction if they rollback to the last commit, rather than savepoint (whether explicit or implicit). I came to my 'version' from the following by no means exhaustive tests: CASE 1: I created a table a with one column, a1 number, and at the sqlplus prompt inserted a row with a1 = 1. I then ran that unnamed block I referred in an earlier post that, without an exception handler, does the following: INSERT INTO a VALUES (2); INSER