How to insert deliberately incorrect data in a table for the test?

Good morning (or afternoon you BluShadow) :),.

I tried my hand to solve the problem that is mentioned in this thread

Invalid number exception

where the OP has incorrect data in a numeric field.

When I tried to create a test case (which requires the insertion of incorrect data in a numeric field), Oracle fought me teeth and nails and won. I could not put incorrect data in a numeric field.

Question is: How do we convince Oracle to allow me to "ZZZ" in a numeric field?

By the way, what I was trying to solve the problem in the above thread, was to throw the digital field with incorrect data in a string type (Char (20), for instance) and then inspect the string to determine if it is a valid number.

This approach has the potential if Oracle will not validate the contents of the field before castant. If that's the case then it will not work. That of what I tried to test but could not get the test data with.

Thank you for your help,

John.

Question is: How do we convince Oracle to allow me to "ZZZ" in a numeric field?

You can not.

I look more deeply in the other thread that you mentioned, but this is probably a question like this:

Connected to Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 

SQL> create table table1 (
  2   num number(5),
  3   des1 varchar2(10)
  4  );

Table created
SQL> create table table2 (
  2   num varchar2(5),
  3   des2 varchar2(10)
  4  );

Table created
SQL> insert into table1 values(1, 'desc1');

1 row inserted
SQL> insert into table1 values(2, 'desc2');

1 row inserted
SQL> insert into table2 values('1', 'desc1');

1 row inserted
SQL> insert into table2 values('2', 'desc2');

1 row inserted
SQL> insert into table2 values('A', 'desc3');

1 row inserted

SQL> select *
  2  from table1 t1
  3       join table2 t2 on t2.num = t1.num
  4  ;

select *
from table1 t1
     join table2 t2 on t2.num = t1.num

ORA-01722: Nombre non valide

SQL> select *
  2  from table1 t1
  3       join table2 t2 on t2.num = to_char(t1.num)
  4  ;

   NUM DES1       NUM   DES2
------ ---------- ----- ----------
     1 desc1      1     desc1
     2 desc2      2     desc2

We can see what is happening behind the scene by running a plan to explain:

SQL> explain plan for
  2  select *
  3  from table1 t1
  4       join table2 t2 on t2.num = t1.num
  5  ;

Explained

SQL> select * from table(dbms_xplan.display);

PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
Plan hash value: 4277839568
-----------------------------------------------------------------------------
| Id  | Operation          | Name   | Rows  | Bytes | Cost (%CPU)| Time     |
-----------------------------------------------------------------------------
|   0 | SELECT STATEMENT   |        |     3 |    93 |     7  (15)| 00:00:01 |
|*  1 |  HASH JOIN         |        |     3 |    93 |     7  (15)| 00:00:01 |
|   2 |   TABLE ACCESS FULL| TABLE1 |     2 |    40 |     3   (0)| 00:00:01 |
|   3 |   TABLE ACCESS FULL| TABLE2 |     3 |    33 |     3   (0)| 00:00:01 |
-----------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
   1 - access("T1"."NUM"=TO_NUMBER("T2"."NUM"))
Note
-----
   - dynamic sampling used for this statement

19 rows selected

The predicate of access actually includes a TO_NUMBER, which of course not on NUM = "A".

Published by: odie_63 on 24 July. 2010 12:39

Tags: Database

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