Raise Error In 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 meaningful to your PL/SQL oracle raise_application_error program. With many programming languages, unless you disable error checking, a run-time error such
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as stack overflow or division by zero stops normal processing and returns control to the operating system. With PL/SQL, a mechanism called raise user defined exception in oracle stored procedure 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 Handling Advantages of PL/SQL Exceptions Predefined PL/SQL oracle user defined exception code range 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 division by zero and out of memory. Some common internal
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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 exception handlers. The optional OTHERS handler catches all exceptions that the block does not name specifically. DECLARE pe_ratio NUMBER(3,1); BEGIN S
errors. The latter are called exceptions. Note: The language raise without exception name oracle of warning and error messages depends on the NLS_LANGUAGE oracle predefined exceptions parameter. For information about this parameter, see Oracle Database Globalization Support Guide. Topics Compile-Time Warnings
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Overview of Exception Handling Internally Defined Exceptions Predefined Exceptions User-Defined Exceptions Redeclared Predefined Exceptions Raising Exceptions Explicitly Exception Propagation Unhandled Exceptions Error Code and https://docs.oracle.com/cd/A97630_01/appdev.920/a96624/07_errs.htm Error Message Retrieval Continuing Execution After Handling Exceptions Retrying Transactions After Handling Exceptions See Also: "Exception Handling in Triggers" "Handling FORALL Exceptions After FORALL Statement Completes" Tip: If you have problems creating or running PL/SQL code, check the Oracle Database trace files. The USER_DUMP_DEST initialization parameter specifies the current https://docs.oracle.com/cd/E11882_01/appdev.112/e25519/errors.htm location of the trace files. You can find the value of this parameter by issuing SHOW PARAMETER USER_DUMP_DEST. For more information about trace files, see Oracle Database Performance Tuning Guide. Compile-Time Warnings While compiling stored PL/SQL units, the PL/SQL compiler generates warnings for conditions that are not serious enough to cause errors and prevent compilation—for example, using a deprecated PL/SQL feature. To see warnings (and errors) generated during compilation, either query the static data dictionary view *_ERRORS (described in Oracle Database Reference) or, in the SQL*Plus environment, use the command SHOW ERRORS. The message code of a PL/SQL warning has the form PLW-nnnnn. For the message codes of all PL/SQL warnings, see Oracle Database Error Messages. Table 11-1 summarizes the categories of warnings. Table 11-1 Compile-Time Warning Categories Category Description Example SEVERE Condition might cause unexpected action or wrong results. Aliasing problems with p
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 oracle raise Resources PL/SQL - 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 user defined exception and an appropriate action is 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