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Pl Sql Error Handling Sql Code

The runtime system raises them implicitly (automatically). For example, the following declaration raises an exception because the constant credit_limit cannot store numbers larger than 999: DECLARE credit_limit CONSTANT NUMBER(3) := 5000; -- raises an exception BEGIN ... The invoker does not handle the exception, so PL/SQL returns an unhandled exception error to the host environment. Passing a zero to SQLERRM always returns the message normal, successful completion. this content

Each handler consists of a WHEN clause, which specifies an exception, followed by a sequence of statements to be executed when that exception is raised. You cannot anticipate all possible exceptions, but you can write exception handlers that let your program to continue to operate in their presence. The outer block handles the exception with an OTHERS exception handler. p_Top should be TRUE only at the topmost level of procedure nesting. https://docs.oracle.com/cd/A97630_01/appdev.920/a96624/07_errs.htm

LOGIN_DENIED 01017 -1017 It is raised when s program attempts to log on to the database with an invalid username or password. 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 PL/SQL procedure successfully completed. The inner block does not have an exception handler for C, so exception C propagates to the outer block.

Then I reran everything just as in case3, except that: the stored procedure had NO error trap but the unnamed block that calls it DOES. To invoke RAISE_APPLICATION_ERROR, use this syntax: RAISE_APPLICATION_ERROR (error_code, message[, {TRUE | FALSE}]); You must have assigned error_code to the user-defined exception with the EXCEPTION_INIT pragma. You can, however, declare the same exception in two different blocks. With PL/SQL, a mechanism called exception handling lets you bulletproof your program so that it can continue operating in the presence of errors.

Before starting the transaction, mark a savepoint. CASE_NOT_FOUND None of the choices in the WHEN clauses of a CASE statement is selected, and there is no ELSE clause. You declare an exception by introducing its name, followed by the keyword EXCEPTION. If the parameter is FALSE (the default), the error replaces all previous errors.

Example 11-5 Naming Internally Defined Exception DECLARE deadlock_detected EXCEPTION; PRAGMA EXCEPTION_INIT(deadlock_detected, -60); BEGIN ... Jobs Send18 Whiteboard Net Meeting Tools Articles Facebook Google+ Twitter Linkedin YouTube Home Tutorials Library Coding Ground Tutor Connect Videos Search PL/SQL Tutorial PL/SQL - Home PL/SQL - Overview PL/SQL - TOO_MANY_ROWS A SELECT INTO statement returns more than one row. In procedural statements, VALUE_ERROR is raised if the conversion of a character string into a number fails. (In SQL statements, INVALID_NUMBER is raised.) ZERO_DIVIDE Your program attempts to divide a number

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. When I select everything from the table, it gets that single row with a1 = 1. After the exception handler runs, control transfers to the next statement of the outer block. Example 10-1 Runtime Error Handling DECLARE stock_price NUMBER := 9.73; net_earnings NUMBER := 0; pe_ratio NUMBER; BEGIN -- Calculation might cause division-by-zero error.

To have the enclosing block handle the raised exception, you must remove its declaration from the sub-block or define an OTHERS handler. http://iipseconline.com/pl-sql/pl-sql-error-handling-examples.html 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 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 TIMEOUT_ON_RESOURCE A time-out occurs while Oracle is waiting for a resource.

A SQL statement cannot invoke SQLCODE or SQLERRM. SELF_IS_NULL 30625 -30625 A program attempts to call a MEMBER method, but the instance of the object type has not been initialized. If you exit a stored subprogram with an unhandled exception, PL/SQL does not assign values to OUT parameters. http://iipseconline.com/pl-sql/pl-sql-error-handling-example.html If the transaction succeeds, commit, then exit from the loop.

If you need to check for errors at a specific spot, you can enclose a single statement or a group of statements inside its own BEGIN-END block with its own exception Redeclaring Predefined Exceptions Remember, PL/SQL declares predefined exceptions globally in package STANDARD, so you need not declare them yourself. For each exception handler, carefully decide whether to have it commit the transaction, roll it back, or let it continue.

For example, the following GOTO statement is illegal: DECLARE pe_ratio NUMBER(3,1); BEGIN DELETE FROM stats WHERE symbol = 'XYZ'; SELECT price / NVL(earnings, 0) INTO pe_ratio FROM stocks WHERE symbol =

If earnings are zero, the function DECODE returns a null. SELECT error_seq.nextval INTO v_SeqNum FROM DUAL; p_SeqNum := v_SeqNum; -- Insert first part of header info. All Rights Reserved. An application can call raise_application_error only from an executing stored subprogram (or method).

PSOUG Home Code Snippets Oracle Lookup Oracle Reference Oracle Error Codes Oracle Functions PSOUG Forum CODE Oracle Code Library JOBS Find Or Post Oracle Jobs FORUM Oracle Discussion & Chat PSOUG Whenever a message is displayed using RAISE_APPLICATION_ERROR, all previous transactions which are not committed within the PL/SQL Block are rolled back automatically (i.e. COMPILE statement. http://iipseconline.com/pl-sql/pl-sql-error-handling-exception.html At the level of the SQL*Plus prompt, every update/insert/delete has one implicit savepoint, and also the invocation of any unnamed block.

DUP_VAL_ON_INDEX Your program attempts to store duplicate values in a database column that is constrained by a unique index. Otherwise, you can handle them only with OTHERS exception handlers. Learn the names and causes of the predefined exceptions. For more information about PL/SQL units and compiler parameters, see "PL/SQL Units and Compilation Parameters".

By associating the exception code to a name and using it as a named exception.