Where clause with zero length string should be converted to NULL if db is Oracle
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Key: TORQUE-58
URL: http://issues.apache.org/jira/browse/TORQUE-58
Project: Torque
Issue Type: Bug
Components: Runtime
Affects Versions: 3.2.1
Environment: All OS, All Hardware, Oracle db
Reporter: parthasarathy
Fix For: 3.2.1
Oracle treats Zero length characters as NULL. Consider the following case
-- Table create --
create table nullzero (field1 varchar2(10), field2 varchar2(10));
-- Record insert --
insert into nullzero('',null);
-- Query --
select * from nullzero where field1 = "" -- returns no rows
select * from nullzero where field2 is null -- returns the inserted row
select * from nullzero where field1 is null -- returns the inserted row.
The first statement should have returned a record as we inserted "" for field1.
But it did not return a row as Oracle has converted the "" to NULL during
insert. We cannot change the where clause as we want the criteria to be db
agnostic. For example the first statement would have worked in other dbs.
We should handle this case in torque to change the where clause to NULL if it
is "" (zero length string) . One place where we can do this is at build()
method of org.apache. torque.util.SQLExpression.
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