Wednesday, November 27, 2013

How to print line numbers in PL/SQL


Any one who wants to be a good programmer must also acquire good debugging skills. Oracle PL/SQL database programming offers several easy code debugging options through the DBMS_UTILITY package. This article provides some naunces about printing line numbers in PL/SQL code.


One can print the exact line number that caused the PL/SQL error by using the supplied DBMS_FORMAT.FORMAT_ERROR_BACKTRACE procedure.  It can be called directly in the dbms_output.put_line procedure.  An example is shown below. 

How to print line numbers in SQL*Developer

Many Oracle developers use Oracle SQL*Developer IDE (Integrated Development Environment) for working on SQL and PL/SQL code. One can let SQL*Developer display the line numbers by using the  TOOLS => Preferences => Code Editor => Line Gutter option

PL/SQL anonymous blocks are always counted from the DECLARE section

One common mistake that PL/SQL programmers do is to assume that the line number shown by the DBMS_FORMAT.FORMAT_ERROR_BACKTRACE is counted from the first line of the code. In the above example, the 1st line number is for the line that contains "set serveroutput on". The PL/SQL code starts only from DECLARE section (line 2). So for the PL/SQL compiler, line 1 is what shown as line 2 in the above screenshot. 

The error occurred in PL/SQL code line 7 v_name := 'DBA UNIVERSITY'; (which is line 8 for SQL*Developer). So when debugging anonymous PL/SQL code, one should always count the 1st line from the line that contains DECLARE.


Hope this helps !  We are always looking for your participation in this blog. Please feel free to provide more tips by commenting below to help other readers.


karthick said...

thanks a lots....

PLSQL Training Institute in Chennai

sas online training in hyderabad said...

nice posts..
SAS Institute introduced the SAS Certified Professional Program,training proper understanding of how the SAS software works. Among the five certification programs that SAS Institute has come up with, SAS training can be considered as the entry point into the big data and the data analytics industry.
SAS online training in hyderabad

Related Posts Plugin for WordPress, Blogger...