Trigger to record SQL when constraint error encountered

I am trying to get a trigger to work when a user gets a constraint error.    It is supposed to record the SQL being executed by the user.  

The trigger is working fine until I try to combine the multiple lines of the  SQL statement into a variable so that it's all one line.

But when I put in the  line to do the combine, only the first two utl_file.put_line commands performed prior to the loop will work.  All others fail.  

Here is my combine command:      sql_stmt_text := sql_stmt_text || l_text(i);

Here is the trigger:

create or replace trigger test_trigger
after servererror on database

declare

l_text ora_name_list_t;
l_n number;
sql_stmt_text varchar2(32767);
v_output_file1 utl_file.file_type;    

begin

v_output_file1 := UTL_FILE.FOPEN('SQL_STMT_OUTPUT','failing_SQL_Stmt.txt','W');                  


if ( is_servererror(0001) )
then
  utl_file.put_line(v_output_file1,'--------------------');
  utl_file.put_line(v_output_file1,'statement causing error: ');
 
  l_n := ora_sql_txt( l_text );

  for i in 1 .. nvl(l_n,0) loop

    -- this statement works when it is the only one in the loop.
    -- also all following utl_file.put_line commands are successful.
    utl_file.put_line(v_output_file1,l_text(i));

    -- when I include this statement, none of the utl_file.put_line commands work except
    --  for the two just before the loop.  
    sql_stmt_text := sql_stmt_text || l_text(i);

  end loop;

  utl_file.put_line(v_output_file1,sql_stmt_text);

  utl_file.put_line(v_output_file1,'error text: ');

  for i in 1 .. ora_server_error_depth
  loop
    utl_file.put_line(v_output_file1,ora_server_error_msg(i));
  end loop;
    utl_file.put_line(v_output_file1,'--------------------');

end if;

utl_file.fclose_all;

end;
/
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Julie KurpaSr. Systems ProgrammerAsked:
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slightwv (䄆 Netminder) Commented:
What version of Oracle are you using?

Works for me using 18.0.

I modified your PUT_LINES to add location1 and location2 tothem so I know what wrote what.

create or replace trigger test_trigger
after servererror on database

declare

l_text ora_name_list_t;
l_n number;
sql_stmt_text varchar2(32767);
v_output_file1 utl_file.file_type;    

begin

v_output_file1 := UTL_FILE.FOPEN('SQL_STMT_OUTPUT','failing_SQL_Stmt.txt','W');                  

if ( is_servererror(0001) )
then
  utl_file.put_line(v_output_file1,'--------------------');
  utl_file.put_line(v_output_file1,'statement causing error: ');
 
  l_n := ora_sql_txt( l_text );


  for i in 1 .. nvl(l_n,0) loop

    -- this statement works when it is the only one in the loop.
    -- also all following utl_file.put_line commands are successful.
    utl_file.put_line(v_output_file1,'Location1: ' || l_text(i));

    -- when I include this statement, none of the utl_file.put_line commands work except
    --  for the two just before the loop.  
    sql_stmt_text := sql_stmt_text || l_text(i);

  end loop;

  utl_file.put_line(v_output_file1,'Location2: ' || sql_stmt_text);

  utl_file.put_line(v_output_file1,'error text: ');

  for i in 1 .. ora_server_error_depth
  loop
    utl_file.put_line(v_output_file1,ora_server_error_msg(i));
  end loop;
    utl_file.put_line(v_output_file1,'--------------------');

end if;

utl_file.fclose_all;

end;
/

show errors

create or replace directory SQL_STMT_OUTPUT as 'C:\TEMP';

drop table tab1 purge;
create table tab1(col1 char(1) primary key);

insert into tab1 values('a');
insert into tab1 values('a');

Open in new window


My test run output:
SQL> @q

Trigger created.

No errors.

Directory created.


Table dropped.


Table created.


1 row created.

insert into tab1 values('a')
*
ERROR at line 1:
ORA-00001: unique constraint (BUD.SYS_C0016150) violated

Open in new window


My file contents:
C:\TEMP>type failing_SQL_Stmt.txt
--------------------
statement causing error:
Location1: insert into tab1 values('a')
Location2: insert into tab1 values('a')
error text:
ORA-00001: unique constraint (MYUSER.SYS_C0016150) violated

--------------------

Open in new window

Julie KurpaSr. Systems ProgrammerAuthor Commented:
Thanks Slightwv.  :)

I'm using Oracle 11g running on Oracle LInux.  

Perhaps it would help if I included the output without the "offending" line and then with it so you see what I see.   Am putting it together now.
Julie KurpaSr. Systems ProgrammerAuthor Commented:
In breaking down the changes, I see that it's actually the "utl_file.put_line(v_output_file1,sql_stmt_text);"  that is causing the problem, not the "sql_stmt_text := sql_stmt_text || l_text(i);".

Here is the output WITHOUT the "utl_file.put_line(v_output_file1,sql_stmt_text);"

--------------------
statement causing error:
INSERT INTO myuser.tab1(column1,column2,column3,column4,column5,
column6,column7,column8,column9,column10,column11,column12,colum
m13) VALUES (1111,2222,3333,4444,5555,6666,7777,8888,9999,1010,1
111,1212,1313)
error text:
ORA-00001: unique constraint (MYUSER.PK_TAB1) violated


This is the output when  I include the "utl_file.put_line(v_output_file1,sql_stmt_text);" statement. Notice it doesn't write anything after it's supposed to writethe contents of varable sql_stmt_text:

--------------------
statement causing error:
INSERT INTO myuser.tab1(column1,column2,column3,column4,column5,
column6,column7,column8,column9,column10,column11,column12,colum
m13) VALUES (1111,2222,3333,4444,5555,6666,7777,8888,9999,1010,1
111,1212,1313)


I tried sending the contents of variable sql_stmt_text to different file altogether.  
When doing that, I get the full constraint information written to the first location but never the content of the sql_stmt_text variable in the 2nd file. The 2nd location stays blank.
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slightwv (䄆 Netminder) Commented:
I can only go with what I can personally test.  The code I posted worked for me.

If you want me to run some other test, post the code you wish me to test.  I don't have access to an 11g database any more but can test on 12.2 right now and 18c later today.

>>Here is the output WITHOUT the "utl_file.put_line(v_output_file1,sql_stmt_text);

If you are getting the output you want, what are you trying to accomplish by changing it?  I'm not understanding why you need the SQL on a single line.  What happens when you get SQL larger than 32k?
Julie KurpaSr. Systems ProgrammerAuthor Commented:
It seems your code is exactly like mine so I don't really have any changes to make.  If it runs in 12.2 then I'm not sure what else to try.


I wanted to get the SQL into a single line because I plan to extract certain elements from it and use it in a procedure.  If it's wrapping like it is, then certain elements I need may be split between lines.
slightwv (䄆 Netminder) Commented:
OK, I think I've been able to reproduce this using longer SQL.  Let me dig into this a little more.
slightwv (䄆 Netminder) Commented:
Took me a while to remember this:  The FOPEN has a max_linesize parameter that defaults to 1024.

You need to specify a larger value:
https://docs.oracle.com/en/database/oracle/oracle-database/18/arpls/UTL_FILE.html#GUID-DF14ADC3-983D-4E0F-BE2C-60733FF58539

I also cleaned up the code.  There isn't a reason to create the concatenated string.  Just use PUT instead of PUT_LINE.  Just issue a PUT_LINE outside the loop to finish off the line.

Here is my modified test case:
create or replace trigger test_trigger
after servererror on database

declare

l_text ora_name_list_t;
l_n number;
v_output_file1 utl_file.file_type;    

begin

v_output_file1 := UTL_FILE.FOPEN('SQL_STMT_OUTPUT','failing_SQL_Stmt.txt','W',32767);                  

if ( is_servererror(0001) )
then
  utl_file.put_line(v_output_file1,'--------------------');
  utl_file.put_line(v_output_file1,'statement causing error: ');
 
  l_n := ora_sql_txt( l_text );

  for i in 1 .. nvl(l_n,0) loop
    utl_file.put(v_output_file1,l_text(i));
  end loop;
  utl_file.put_line(v_output_file1,null);

  utl_file.put_line(v_output_file1,'error text: ');

  for i in 1 .. ora_server_error_depth
  loop
    utl_file.put_line(v_output_file1,ora_server_error_msg(i));
  end loop;
    utl_file.put_line(v_output_file1,'--------------------');

end if;

utl_file.fclose(v_output_file1);

end;
/

show errors

create or replace directory SQL_STMT_OUTPUT as '/tmp';

drop table tab1 purge;
create table tab1(col1 varchar2(4000) primary key);

insert into tab1 values('aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa');
insert into tab1 values('aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa');

Open in new window

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Julie KurpaSr. Systems ProgrammerAuthor Commented:
I really appreciate your help.

On a whim, I directed that variable to a table instead of to a file and it seems to work.  The entire SQL is being written into one column.  This is where I eventually wanted to end up but was just writting to the file so I could see what I was getting.

Here's the adjusted code.  

create or replace trigger test_trigger
after servererror on database

declare

l_text ora_name_list_t;
l_n number;
sql_stmt_text varchar2(32767);
v_output_file1 utl_file.file_type;    

begin

v_output_file1 := UTL_FILE.FOPEN('SQL_STMT_OUTPUT','failing_SQL_Stmt.txt','W');                  


if ( is_servererror(0001) )
then
  utl_file.put_line(v_output_file1,'--------------------');
  utl_file.put_line(v_output_file1,'statement causing error: ');
 
  l_n := ora_sql_txt( l_text );

  for i in 1 .. nvl(l_n,0) loop

    utl_file.put_line(v_output_file1,l_text(i));

    sql_stmt_text := sql_stmt_text || l_text(i);

  end loop;

  INSERT INTO myuser.sql_event VALUES (sql_stmt_text);

  utl_file.put_line(v_output_file1,'error text: ');

  for i in 1 .. ora_server_error_depth
  loop
    utl_file.put_line(v_output_file1,ora_server_error_msg(i));
  end loop;
    utl_file.put_line(v_output_file1,'--------------------');

end if;

utl_file.fclose_all;

end;
/
Julie KurpaSr. Systems ProgrammerAuthor Commented:
oh I just saw your post.  am reading it now.
Julie KurpaSr. Systems ProgrammerAuthor Commented:
That worked great slighwv!  You are wonderful!

I set the FOPEN size to 32767 and I'm getting the full SQL text on one line in the file.
Now I have many options on how to handle the rest of my project.
Julie KurpaSr. Systems ProgrammerAuthor Commented:
Here's the working product with the writing of the SQL on all one line to the output file outside the loop.

create or replace trigger test_trigger
after servererror on database

declare

l_text ora_name_list_t;
l_n number;
sql_stmt_text varchar2(10000);
v_output_file1 utl_file.file_type;    

begin

v_output_file1 := UTL_FILE.FOPEN('SQL_STMT_OUTPUT','failing_SQL_Stmt.txt','W',32767);                  


if ( is_servererror(0001) )
then
  utl_file.put_line(v_output_file1,'--------------------');
  utl_file.put_line(v_output_file1,'statement causing error: ');
 
  l_n := ora_sql_txt( l_text );

  for i in 1 .. nvl(l_n,0) loop

    utl_file.put_line(v_output_file1,l_text(i));

    sql_stmt_text := sql_stmt_text || l_text(i);

  end loop;

  -- write the combined SQL  to a table
  INSERT INTO myuser.sql_event VALUES (sql_stmt_text);

  -- write the combined SQL to the file
  utl_file.put_line(v_output_file1,'error text: ');

  for i in 1 .. ora_server_error_depth
  loop
    utl_file.put_line(v_output_file1,ora_server_error_msg(i));
  end loop;
    utl_file.put_line(v_output_file1,'--------------------');

end if;

utl_file.fclose_all;

end;
/
slightwv (䄆 Netminder) Commented:
>>SQL on all one line to the output file outside the loop.

Why when it isn't necessary?
Julie KurpaSr. Systems ProgrammerAuthor Commented:
Just to show it as part of the solution.  I won't continue to do it now that I'm writing it to a table.
Julie KurpaSr. Systems ProgrammerAuthor Commented:
slightwv didn't have to do further research when his SQL worked fine.  Went the extra mile to reproduce the problem and found the solution.
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