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This section doesn t go into detail about these practices, which are covered well in many PL/SQL books, including 10 of Connor McDonald s Mastering Oracle PL/SQL (Apress, ISBN: 1-59059-217-4). Instead, we will focus on two related topics: How to print an execution stack trace in PL/SQL How to instrument your PL/SQL and JDBC code using a custom PL/SQL package such that you can see your Java and PL/SQL instrumentation messages in the same database session, in the order in which they were executed
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In Java, it s easy to print a full stack trace of an exception when you catch one. Consider the following program, DemoJavaStackTrace. The main() method simply calls function p1, which in turn calls function p2. Function p2 calls function p3, where we divide 1 by 0 to raise an exception. We handle the exception in the main() method and print the stack trace: /* This program simply generates a divide-by-zero error and prints the stack trace.*/ class DemoJavaStackTrace { public static void main(String args[]) { try { p1(); } catch( Exception e ) { e.printStackTrace(); } } // end of main() static void p1() { System.out.println("in p1" ); p2(); } static void p2() { System.out.println("in p2" ); p3(); } static void p3() { System.out.println("in p3" ); int x = 1/0; // will cause an exception } } // end of program
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The output of the program is as follows: B:>java DemoJavaStackTrace in p1 in p2 in p3 java.lang.ArithmeticException: / by zero at DemoJavaStackTrace.p3(DemoJavaStackTrace.java:29) at DemoJavaStackTrace.p2(DemoJavaStackTrace.java:24) at DemoJavaStackTrace.p1(DemoJavaStackTrace.java:19) at DemoJavaStackTrace.main(DemoJavaStackTrace.java:9) As you can see, we have the entire stack trace, and it is easy to see the exact line number where the original error occurred. In PL/SQL this was not as intuitive, at least until 10g. Consider the following set of procedures, p1, p2, and p3, which are roughly the equivalent of the functions p1, p2, and p3 in the preceding Java program. We first create p3, which generates the exception, and p2, which invokes p3: benchmark@ORA10G> create or replace procedure p3 2 is 3 l_x number := 0; 4 begin 5 dbms_output.put_line( 'p3' ); 6 l_x := 1/ l_x; -- divide by zero 7 end; 8 / Procedure created. benchmark@ORA10G> create or replace procedure p2 2 is 3 begin 4 dbms_output.put_line( 'p2' ); 5 p3; 6 end; 7 / Procedure created. Our first version of p1 does not handle any exceptions raised, so the exception is propagated all the way to the client: benchmark@ORA10G> create or replace procedure p1 2 is 3 begin 4 dbms_output.put_line( 'p1' ); 5 p2; 6 end; 7 / Procedure created.
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When we execute procedure p1, we get the entire stack trace printed out: benchmark@ORA10G> exec p1 p1 p2 p3 BEGIN p1; END; * ERROR at line 1: ORA-01476: divisor is equal to zero ORA-06512: at "BENCHMARK.P3", line 6 ORA-06512: at "BENCHMARK.P2", line 5 ORA-06512: at "BENCHMARK.P1", line 5 ORA-06512: at line 1 So far, so good. The problem is that many times, we need to handle an exception (e.g., if we want to execute some cleanup code) and print the stack trace (as we did in our Java program). Let s do the same in p1. We ll have an exception handler in p1 that simply catches the exception and throws it again by invoking the built-in procedure raise: benchmark@ORA10G> create or replace procedure p1 2 is 3 begin 4 dbms_output.put_line( 'p1 (with "raise"' ); 5 p2; 6 exception when others then 7 raise; 8 end; 9 / Procedure created. This time when we execute the procedure, we don t see the entire stack trace; we see only the line number of the code in the procedure where the exception was handled (in this case, p1): benchmark@ORA10G> exec p1; p1 (with "raise" p2 p3 BEGIN p1; END; * ERROR at line 1: ORA-01476: divisor is equal to zero ORA-06512: at "BENCHMARK.P1", line 7 ORA-06512: at line 1
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