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https://issues.apache.org/jira/browse/TORQUE-58?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thomas Fox closed TORQUE-58.
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> Where clause with zero length string should be converted to NULL if db is
> Oracle
> --------------------------------------------------------------------------------
>
> Key: TORQUE-58
> URL: https://issues.apache.org/jira/browse/TORQUE-58
> Project: Torque
> Issue Type: Bug
> Components: Runtime
> Affects Versions: 3.3
> Environment: All OS, All Hardware, Oracle db
> Reporter: parthasarathy
> Assignee: Thomas Fox
>
> 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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