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From there on, the exception propagates normally. Exceptions declared in a block are considered local to that block and global to all its sub-blocks. In Example 11-11, the handling of the exception starts in the inner block and finishes in the outer block. CASE 6: Finally ran case where my unnamed block did some ok inserts, I called a proc that did some more ok updates, then I called a proc that did some http://setiweb.org/pl-sql/pl-sql-error-handling-example.php
Unlike variables, exceptions cannot appear in assignment statements or SQL statements. Associating a PL/SQL Exception with a Number: Pragma EXCEPTION_INIT To handle error conditions (typically ORA- messages) that have no predefined name, you must use the OTHERS handler or the pragma EXCEPTION_INIT. To see any warnings generated during compilation, you use the SQL*Plus SHOW ERRORS command or query the USER_ERRORS data dictionary view. For example, if you declare an exception named invalid_number and then PL/SQL raises the predefined exception INVALID_NUMBER internally, a handler written for INVALID_NUMBER will not catch the internal exception.
ora_server_error_depth LOOP dbms_output.put_line(ora_server_error_msg(i) ); END LOOP; dbms_output.put_line( '--------------------' ); END e_trigger; / Simple Error Handling Procedure Function To Identify The User Logged Onto Oracle CREATE OR However, exceptions cannot propagate across remote procedure calls (RPCs). If you recompile the subprogram with an ALTER ... For example, when your program selects a column value into a character variable, if the value is longer than the declared length of the variable, PL/SQL aborts the assignment and raises
The above program displays the name and address of a customer whose ID is given. The pragma must appear somewhere after the exception declaration in the same declarative section, as shown in the following example: DECLARE deadlock_detected EXCEPTION; PRAGMA EXCEPTION_INIT(deadlock_detected, -60); BEGIN ... -- Some operation Figure 10-1 Propagation Rules: Example 1 Description of the illustration lnpls009.gif Figure 10-2 Propagation Rules: Example 2 Description of the illustration lnpls010.gif Figure 10-3 Propagation Rules: Example 3 Description of the LOOP -- could be FOR i IN 1..10 LOOP to allow ten tries BEGIN -- sub-block begins SAVEPOINT start_transaction; -- mark a savepoint /* Remove rows from a table of survey
DECLARE name VARCHAR2(20); ans1 VARCHAR2(3); ans2 VARCHAR2(3); ans3 VARCHAR2(3); suffix NUMBER := 1; BEGIN ... If you store the debugging information in a separate table, do it with an autonomous routine, so that you can commit your debugging information even if you roll back the work 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 https://docs.oracle.com/cd/E11882_01/appdev.112/e25519/errors.htm However, other user-defined exceptions must be raised explicitly by RAISE statements.
IF ... If the transaction succeeds, commit, then exit from the loop. In other words, you cannot resume processing where you left off. Remember, no matter how severe the error is, you want to leave the database in a consistent state and avoid storing any bad data.
Catching Unhandled Exceptions Remember, if it cannot find a handler for a raised exception, PL/SQL returns an unhandled exception error to the host environment, which determines the outcome. https://www.tutorialspoint.com/plsql/plsql_exceptions.htm Errors are especially likely during arithmetic calculations, string manipulation, and database operations. Redeclared Predefined Exceptions Oracle recommends against redeclaring predefined exceptions—that is, declaring a user-defined exception name that is a predefined exception name. (For a list of predefined exception names, see Table 11-3.) Example 11-8 Redeclared Predefined Identifier DROP TABLE t; CREATE TABLE t (c NUMBER); In the following block, the INSERT statement implicitly raises the predefined exception INVALID_NUMBER, which the exception handler handles.
The maximum length of an Oracle error message is 512 characters including the error code, nested messages, and message inserts such as table and column names. http://setiweb.org/pl-sql/pl-sql-error-handling-best-practices.php Therefore, a PL/SQL block cannot catch an exception raised by a remote subprogram. For the message codes of all PL/SQL warnings, see Oracle Database Error Messages. The message code of a PL/SQL warning has the form PLW-nnnnn.
IF ... The technique is: Encase the transaction in a sub-block. Continuing after an Exception Is Raised An exception handler lets you recover from an otherwise fatal error before exiting a block. http://setiweb.org/pl-sql/pl-sql-error-handling.php An internally defined exception does not have a name unless either PL/SQL gives it one (see "Predefined Exceptions") or you give it one.
They might point out something in the subprogram that produces an undefined result or might create a performance problem. That way, an exception handler written for the predefined exception can process other errors, as the following example shows: DECLARE acct_type INTEGER := 7; BEGIN IF acct_type NOT IN (1, 2, Usenet source: Ken Quirici (c.d.o.server - 29-Oct-2004) Basic Exception Handling With Error Basic Block Structure Handling CREATE OR REPLACE PROCEDURE IS BEGIN NULL; EXCEPTION WHEN THEN
CASE 5: Then I deleted everything from the table 1 except the a1 = 1 and did a commit.
If you exit a subprogram successfully, PL/SQL assigns values to OUT parameters. If there is no handler for a user-defined exception, the calling application gets the following error: ORA-06510: PL/SQL: unhandled user-defined exception Reraising a PL/SQL Exception Sometimes, you want to reraise an If the optional third parameter is TRUE, the error is placed on the stack of previous errors. http://setiweb.org/pl-sql/pl-sql-error-handling-examples.php The other internal exceptions can be given names.