Dbms Standard Raise Application Error
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Error Handling" in Oracle Database PL/SQL Language Reference. See the end of this chapter for TimesTen-specific raise application error in oracle stored procedure considerations. The following topics are covered: Understanding exceptions Trapping exceptions Showing oracle raise errors in ttIsql Differences in TimesTen: exception handing and error behavior Understanding exceptions This section provides difference between raise and raise_application_error in oracle an overview of exceptions in PL/SQL programming, covering the following topics: About exceptions Exception types About exceptions An exception is a PL/SQL error that is raised
Raise_application_error(-20001
during program execution, either implicitly by TimesTen or explicitly by your program. Handle an exception by trapping it with a handler or propagating it to the calling environment. For example, if your SELECT statement returns multiple rows, TimesTen returns an error (exception) at runtime. As the following example shows, you would see TimesTen error difference between pragma exception_init and raise_application_error 8507, then the associated ORA error message. (ORA messages, originally defined for Oracle Database, are similarly implemented by TimesTen.) Command> DECLARE > v_lname VARCHAR2 (15); > BEGIN > SELECT last_name INTO v_lname > FROM employees > WHERE first_name = 'John'; > DBMS_OUTPUT.PUT_LINE ('Last name is :' || v_lname); > END; > / 8507: ORA-01422: exact fetch returns more than requested number of rows 8507: ORA-06512: at line 4 The command failed. You can handle such exceptions in your PL/SQL block so that your program completes successfully. For example: Command> DECLARE > v_lname VARCHAR2 (15); > BEGIN > SELECT last_name INTO v_lname > FROM employees > WHERE first_name = 'John'; > DBMS_OUTPUT.PUT_LINE ('Last name is :' || v_lname); > EXCEPTION > WHEN TOO_MANY_ROWS THEN > DBMS_OUTPUT.PUT_LINE (' Your SELECT statement retrieved multiple > rows. Consider using a cursor.'); > END; > / Your SELECT statement retrieved multiple rows. Consider using a cursor. PL/SQL procedure successfully completed. Exception types Ther
| PL/SQL Exception Handling Exception Handling In this section we will discuss about the following, 1) What is Exception Handling. 2) Structure of Exception Handling. 3) Types of Exception Handling. 1) What pl sql exception handling examples is Exception Handling? PL/SQL provides a feature to handle the Exceptions which occur
Raise Application Error In Oracle Triggers
in a PL/SQL Block known as exception Handling. Using Exception Handling we can test the code and avoid it from
Pl/sql Raises An Exception In Which Two Of The Following Cases
exiting abruptly. When an exception occurs a messages which explains its cause is recieved. PL/SQL Exception message consists of three parts. 1) Type of Exception 2) An Error Code 3) A message https://docs.oracle.com/cd/E11882_01/timesten.112/e21639/exceptions.htm By Handling the exceptions we can ensure a PL/SQL block does not exit abruptly. 2) Structure of Exception Handling. General Syntax for coding the exception section DECLARE Declaration section BEGIN Exception section EXCEPTION WHEN ex_name1 THEN -Error handling statements WHEN ex_name2 THEN -Error handling statements WHEN Others THEN -Error handling statements END; General PL/SQL statments can be used in the Exception Block. When an http://plsql-tutorial.com/plsql-exception-handling.htm exception is raised, Oracle searches for an appropriate exception handler in the exception section. For example in the above example, if the error raised is 'ex_name1 ', then the error is handled according to the statements under it. Since, it is not possible to determine all the possible runtime errors during testing fo the code, the 'WHEN Others' exception is used to manage the exceptions that are not explicitly handled. Only one exception can be raised in a Block and the control does not return to the Execution Section after the error is handled. If there are nested PL/SQL blocks like this. DELCARE Declaration section BEGIN DECLARE Declaration section BEGIN Execution section EXCEPTION Exception section END; EXCEPTION Exception section END; In the above case, if the exception is raised in the inner block it should be handled in the exception block of the inner PL/SQL block else the control moves to the Exception block of the next upper PL/SQL Block. If none of the blocks handle the exception the program ends abruptly with an error. 3) Types of Exception. There are 3 types of Exceptions. a) Named System Exceptions b
you should consider them as your closest friends. They are the ones that honestly say what is wrong with your program. We cannot foresee all possible problematic events, and even the http://allthingsoracle.com/error-handling/ best programmers write bugs. Exceptions There are three kinds of exceptions Internally defined: A system error, defined by Oracle, that occurs. Predefined: The most common internally defined exceptions that are given predefined names. User defined: A logical error which you define and raise yourself System errors could occur from improper coding, like the “ORA-01001: Invalid cursor”, which you should try to fix as soon as possible in your code. And raise application the “TOO_MANY_ROWS”-error might give you clues about bad data quality. To resolve these bugs, it is important to know where, when and why it happened. But system errors could also occur from hardware failures, like the “ORA-12541: TNS: no listener”, when an ftp-server might be unreachable over the network. In that case, all you can do, and should do, is provide proper error handling and transaction management, and give as raise application error detailed information as possible about this situation to the people that need to know. These system-errors always have an error number assigned, so you can easily identify the error. The 22 predefined exceptions also have a name assigned, which allows for easier, and more readable exception handling. For the other, non-predefined, system-errors, a name can be linked by using the pragma “EXCEPTION_INIT”. DECLARE network_error EXCEPTION; PRAGMA EXCEPTION_INIT(network_error, -12541); BEGIN ... EXCEPTION WHEN too_many_rows THEN ... WHEN network_error THEN ... END; User defined errors we will raise ourselves. They can be given a number and a name. To raise a user defined error with a chosen number and error message, we call the procedure “RAISE_APPLICATION_ERROR”. Oracle allows us the create error numbers in the range of -20000 to -20999. This allows us to create 1000 unique error codes for our logical errors throughout our application. Just like we did for system errors, we can name our user defined errors by using the pragma “EXCEPTION_INIT”. BEGIN RAISE_APPLICATION_ERROR(-20000,’Logical error occured’); END; If we do not care about the error code and error message, and we will foresee an exception block to directly handle the error, we could also raise errors by the keyword “RAISE”, followed by the exception name. If we