Raise Error In Oracle Pl Sql
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Churchill Run-time errors arise from design faults, coding mistakes, hardware failures, and many other sources. Although you cannot anticipate all possible errors, you can plan to handle certain kinds of errors pl sql raise exception meaningful to your PL/SQL program. With many programming languages, unless you disable error checking, oracle raise_application_error a run-time error such as stack overflow or division by zero stops normal processing and returns control to the operating
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system. With PL/SQL, a mechanism called exception handling lets you "bulletproof" your program so that it can continue operating in the presence of errors. This chapter discusses the following topics: Overview of PL/SQL Error
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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 Propagate Reraising a PL/SQL Exception Handling Raised PL/SQL Exceptions Tips for Handling PL/SQL Errors Overview of PL/SQL Error Handling In PL/SQL, a warning or error condition is called an exception. Exceptions can be internally defined (by the run-time system) or user defined. Examples of internally defined exceptions include oracle user defined exception code range division by zero and out of memory. Some common internal exceptions have predefined names, such as ZERO_DIVIDE and STORAGE_ERROR. The other internal exceptions can be given names. You can define exceptions of your own in the declarative part of any PL/SQL block, subprogram, or package. For example, you might define an exception named insufficient_funds to flag overdrawn bank accounts. Unlike internal exceptions, user-defined exceptions must be given names. When an error occurs, an exception is raised. That is, normal execution stops and control transfers to the exception-handling part of your PL/SQL block or subprogram. Internal exceptions are raised implicitly (automatically) by the run-time system. User-defined exceptions must be raised explicitly by RAISE statements, which can also raise predefined exceptions. To handle raised exceptions, you write separate routines called exception handlers. After an exception handler runs, the current block stops executing and the enclosing block resumes with the next statement. If there is no enclosing block, control returns to the host environment. In the example below, you calculate and store a price-to-earnings ratio for a company with ticker symbol XYZ. If the company has zero earnings, the predefined exception ZERO_DIVIDE is raised. This stops normal execution of the block and transfers control to the
user-defined exceptions whose names you decide. Syntax raise_statement ::= Description of the illustration
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raise_statement.gif Keyword and Parameter Descriptions exception_name A predefined or raise without exception name oracle user-defined exception. For a list of the predefined exceptions, see Predefined PL/SQL Exceptions. oracle predefined exceptions Usage Notes Raise an exception in a PL/SQL block or subprogram only when an error makes it impractical to continue processing. You can https://docs.oracle.com/cd/A97630_01/appdev.920/a96624/07_errs.htm 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.
Basic Syntax PL/SQL - Data Types PL/SQL - Variables PL/SQL - Constants PL/SQL - Operators PL/SQL - Conditions PL/SQL - Loops PL/SQL - Strings PL/SQL - https://www.tutorialspoint.com/plsql/plsql_exceptions.htm Arrays PL/SQL - Procedures PL/SQL - Functions PL/SQL - Cursors PL/SQL - Records PL/SQL - Exceptions PL/SQL - Triggers PL/SQL - Packages PL/SQL - Collections PL/SQL - Transactions PL/SQL - Date & Time PL/SQL - DBMS Output PL/SQL - Object Oriented PL/SQL Useful Resources PL/SQL - Questions and Answers PL/SQL - Quick Guide PL/SQL - Useful Resources PL/SQL - oracle raise Discussion Selected Reading Developer's Best Practices Questions and Answers Effective Resume Writing HR Interview Questions Computer Glossary Who is Who PL/SQL - Exceptions Advertisements Previous Page Next Page An error condition during a program execution is called an exception in PL/SQL. PL/SQL supports programmers to catch such conditions using EXCEPTION block in the program and an appropriate action is user defined exception taken against the error condition. There are two types of exceptions: System-defined exceptions User-defined exceptions Syntax for Exception Handling The General Syntax for exception handling is as follows. Here you can list down as many as exceptions you want to handle. The default exception will be handled using WHEN others THEN: DECLARE