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Pl/sql Catch Application Error
PL/SQL declares predefined exceptions globally in package STANDARD, which defines the PL/SQL environment. The usual scoping rules for PL/SQL variables apply, so you can reference local and global variables in an exception handler. Example 11-6 Anonymous Block Handles ZERO_DIVIDE DECLARE stock_price NUMBER := 9.73; net_earnings NUMBER := 0; pe_ratio NUMBER; BEGIN pe_ratio := stock_price / net_earnings; -- raises ZERO_DIVIDE exception DBMS_OUTPUT.PUT_LINE('Price/earnings ratio = ' Handle named exceptions whenever possible, instead of using WHEN OTHERS in exception handlers. http://setiweb.org/pl-sql/plsql-exception-raise-application-error.php
Example 11-23 Exception Handler Runs and Execution Ends DROP TABLE employees_temp; CREATE TABLE employees_temp AS SELECT employee_id, salary, commission_pct FROM employees; DECLARE sal_calc NUMBER(8,2); BEGIN INSERT INTO employees_temp (employee_id, salary, commission_pct) 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. If the transaction succeeds, the COMMIT and EXIT statements execute. For example, in the Oracle Precompilers environment, any database changes made by a failed SQL statement or PL/SQL block are rolled back.
Pl Sql Exception When Others
In other words, you cannot resume processing where you left off. Passing a zero to SQLERRM always returns the message normal, successful completion. Skip Headers PL/SQL User's Guide and Reference Release 2 (9.2) Part Number A96624-01 Home Book List Contents Index Master Index Feedback 7 Handling PL/SQL Errors There is nothing more exhilarating than Because a block can reference only local or global exceptions, enclosing blocks cannot reference exceptions declared in a sub-block.
STORAGE_ERROR 06500 -6500 PL/SQL runs out of memory or memory has been corrupted. SYS_INVALID_ROWID ORA-01410 The conversion of a character string into a universal rowid fails because the character string does not represent a valid rowid. Therefore, beyond its scope, a user-defined exception can be handled only with an OTHERS exception handler. Pl Sql Exception Handling Best Practices The technique is: Encase the transaction in a sub-block.
When the exception handler completes, the sub-block terminates, control transfers to the LOOP statement in the enclosing block, the sub-block starts executing again, and the transaction is retried. For example, the predefined exception NO_DATA_FOUND is raised when a SELECT INTO statement returns no rows. For Example: Lets consider the product table and order_items table from sql joins to explain user-defined exception. https://docs.oracle.com/cd/B19306_01/appdev.102/b14261/errors.htm PL/SQL supports programmers to catch such conditions using EXCEPTION block in the program and an appropriate action is taken against the error condition.
COMPILE statement, the current session setting might be used, or the original setting that was stored with the subprogram, depending on whether you include the REUSE SETTINGS clause in the statement. Functions For Error Trapping Are Contained In Which Section Of A Pl/sql Block WHEN OTHERS THEN -- optional handler for all other errors sequence_of_statements3 END; To catch raised exceptions, you write exception handlers. NOT_LOGGED_ON ORA-01012 Database connection lost. This chapter discusses the following topics: Overview of PL/SQL Error Handling Advantages of PL/SQL Exceptions Predefined PL/SQL Exceptions Defining Your Own PL/SQL Exceptions How PL/SQL Exceptions Are Raised How PL/SQL Exceptions
Pl Sql Exceptions
For example: EXCEPTION WHEN INVALID_NUMBER THEN INSERT INTO ... -- might raise DUP_VAL_ON_INDEX WHEN DUP_VAL_ON_INDEX THEN ... -- cannot catch the exception END; Branching to or from an Exception Handler A https://www.techonthenet.com/oracle/exceptions/ DECLARE l_table_status VARCHAR2(8); l_index_status VARCHAR2(8); l_table_name VARCHAR2(30) := 'TEST'; l_index_name VARCHAR2(30) := 'IDX_TEST'; ex_no_metadata EXCEPTION; BEGIN BEGIN SELECT STATUS INTO l_table_status FROM USER_TABLES WHERE TABLE_NAME = l_table_name; EXCEPTION WHEN NO_DATA_FOUND THEN Pl Sql Exception When Others Thank you very much. –tgxiii May 16 '11 at 17:18 add a comment| up vote 24 down vote You could use RAISE_APPLICATION_ERROR like this: DECLARE ex_custom EXCEPTION; BEGIN RAISE ex_custom; EXCEPTION User Defined Exception In Pl Sql The USER_DUMP_DEST initialization parameter specifies the current location of the trace files.
This stops normal execution of the block and transfers control to the exception handlers. stmt := 2; -- designates 2nd SELECT statement SELECT ... Topics Propagation of Exceptions Raised in Declarations Propagation of Exceptions Raised in Exception Handlers Propagation of Exceptions Raised in Declarations An exception raised in a declaration propagates immediately to the enclosing 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 Raise Application Error In Oracle
In an exception block, the keyword “RAISE” could also be used without an exception name, which can be useful to add logging or to execute clean-up code, before propagating the error. Note: An internally defined exception with a user-declared name is still an internally defined exception, not a user-defined exception. To raise a user defined error with a chosen number and error message, we call the procedure “RAISE_APPLICATION_ERROR”. When the i_is_one exception handler raises ZERO_DIVIDE, the exception propagates immediately to the invoker (therefore, the ZERO_DIVIDE exception handler does not handle it).
Associate the name with the error code of the internally defined exception. Raise_application_error Syntax VALUE_ERROR 06502 -6502 An arithmetic, conversion, truncation, or size-constraint error occurs. ORA-20001: Duplicate president customer excetpion Process exited.
The FETCH statement is expected to return no rows eventually, so when that happens, no exception is raised.
With DBMS_WARNING subprograms, you can save the current PLSQL_WARNINGS setting, change the setting to compile a particular set of subprograms, and then restore the setting to its original value. ZERO_DIVIDE 01476 1476 It is raised when an attempt is made to divide a number by zero. If the transaction fails, control transfers to the exception handler, where you roll back to the savepoint undoing any changes, then try to fix the problem. Exception Handling In Oracle 11g It is easy to overlook a possible error or a place where it might occur, especially if the error is not immediately detectable (for example, bad data might be undetectable until
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 PL/SQL predefines some common Oracle errors as exceptions. After an exception handler runs, control transfers to the next statement of the enclosing block. USERENV_COMMITSCN_ERROR ORA-01725 Added for USERENV enhancement, bug 1622213.
In Example 11-10, the procedure raises the predefined exception INVALID_NUMBER either explicitly or implicitly, and the INVALID_NUMBER exception handler always handles it. If the parameter is FALSE (the default), the error replaces all previous errors. That lets you refer to any internal exception by name and to write a specific handler for it.