Question

I have two tables

TableA, TableB with many to one relationship defined in hbm.xml

Example:

TableA

Because uni-directional relationship (only TableA to TableB) there are no entries in TableB hbm.xml related to TableA

Now the issue is, TableA may have null values for columnIDFromTableA and when I query TableA, these rows also should showup apart from matching rows from TableB, but it is not working.

The query I have is:

select column1, column2, tableA.tableB.someColumn from TableA tableA left outer join tableA.tableB as tabB where column1  Like '%someval%' 

Above query returning ZERO rows.

As soon as I remove column related to tableB (in this case tableA.tableB.someColumn) from query, I am getting expected results

select column1, column2 from TableA tableA left outer join tableA.tableB as tabB where column1  Like '%someval%' 

above query returning expected results.

Any help would be appreciated.

Answer 1

When you do

tableA.tableB.someColumn

, you create an implicit inner join between the tables.

You already have a left outer join between the tables:

from TableA tableA left outer join tableA.tableB as tabB

So you just need to use the alias you assigned to this left joined entity:

select column1, column2, tabB.someColumn 
from TableA tableA 
left outer join tableA.tableB as tabB 
where column1  Like '%someval%'

Side note: your query would be much more readable if you used aliases systematically:

select tableA.column1, tableA.column2, tableB.someColumn 
from TableA tableA 
left outer join tableA.tableB as tableB 
where tableA.column1 like '%someval%'