This is an excerpt from the book Advanced PL/SQL: The Definitive Reference by Boobal Ganesan.
An exception can be re-raised either to pass the control of the exception to the enclosing block or to log the error into a table and then raise it to an application or to a user. To re-raise an exception, the command RAISE has to be placed in the exception section after the logging of the information is done.
%Note: The exception name can be optionally placed after the RAISE command.
In the below example, the exception ZERO_DIVIDE is logged into a table right before it is re-raised to the user or to the application.
1. SET SERVEROUTPUT ON SIZE 200000
2. DECLARE
3. l_n_var1 NUMBER;
4. BEGIN
5. L_n_var1:= 1/0;
6. EXCEPTION
7. WHEN zero_divide THEN
8. INSERT INTO log_table VALUES (log_seq.nextval,SQLCODE ||' '||sqlerrm);
9. raise;
10.END;
11./
Script Explanation:
Line No. | Description |
1 | This environment variable opens up an output buffer of size limit of 200000. |
2 | Start of the declaration section of the block. |
3 | A local variable l_n_var1 of the number data type is declared. |
4 | Start of the execution section of the block. |
5 | The integer 1 is divided by the integer 0 and is assigned to the variable l_n_var1. |
6 | Start of the exception section of the block. |
7 | A when clause handling the predefined exception zero_divide is defined. |
8 | The error code (SQLCODE) and the error message (SQLERRM) values are logged into a table. |
9 | The exception raise is re-raised using the RAISE statement. |
10,11 | End of the exception section of the block. |
| Need to learn to program with PL/SQL? For complete notes on programming in PL/SQL, we recommend the book Advanced PL/SQL: The Definitive Reference by Boobal Ganesan. This is a complete book on PL/SQL with everything you need to know to write efficient and complex PL/SQL code. |
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