Question: How does the PL/SQL show errors
command work?
Answer: When you run
PL/SQL the code is interpreted at runtime, and you may see these
types of errors:
- Syntax errors: These are indicated
by the "Warning: Procedure created with compilation errors" message.
You can display the error with the "show errors" SQL*Plus command).
- Semantic errors: These are invalid table or column names.
- Run time errors: This is a a non-zero Oracle database
error code.
For more details, see my notes on
PL/SQL debugging techniques.
Show errors command
To see PL/SQL interpreter errors, you can use the SQL*Plus "show
errors" command: as seen in the "show errors" example
SQL> create or
replace procedure example_defaults
2 (n_1
in number := 5,
3 n_2 in number :=
6,
4 n_3 in number := 7)
5 as
6 begin
7 n_1
:= n_2 + n_3;
8 end;
9 /
Warning: Procedure
created with compilation errors.
SQL> show errors
Errors for
PROCEDURE EXAMPLE_DEFAULTS:
LINE/COL ERROR
-------- ------------------------------------------------
PLS-00363: expression 'N_1' cannot be used as an assignment target
For enhanced show errors command feedback, you can join into
dba_errors and dba_source and see the feedback lines
in the PL/SQL source code:
set lines 100
set
pages 100
column
text format a100
with err as (
select distinct
owner,
name,
type,
line,
position,
sequence,
text
from
dba_errors
where
sequence=1
)
select
decode(n,-1,'* ','
')||text text from (
select
sequence n,
owner,name,
type,line,
lpad('
',position-1,' ')||'^'||text text
from
err
union all
select
distinct
-1 n,
owner,
name,
type,
line,
type||' '||owner||'.'||name||' line '||line
from
err
union all
select
0,
owner,
name,
type,
line,
text
from
dba_source
where
(owner,name,type,line)
in
(select
owner,
name,
type,
line
from
err)
order by
owner,name,
type,line,
n
);
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