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https://issues.apache.org/jira/browse/TORQUE-290?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thomas Fox updated TORQUE-290:
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Description:
Currently, it is not easily possible to reference columns in the main select
from a subselect.
For example, to select authors which have published exactly one book, one can
use the SQL:
SELECT * FROM author WHERE (SELECT COUNT(*) FROM book WHERE
book.author_id=author.author_id)=1
One would like to achieve this by
Criteria subselect = new Criteria();
subselect.where(BookPeer.AUTHOR_ID, AuthorPeer.AUTHOR_ID);
subselect.addSelectColumn(new Count("*"));
Criteria criteria = new Criteria();
criteria.where(subselect, 1);
List<Author> result = AuthorPeer.doSelect(criteria);
but the SQL results in (note the additional author in the from clause of the
subselect)
SELECT * FROM author WHERE (SELECT COUNT(*) FROM book, author WHERE
book.author_id=author.author_id)=1
So the desired behavior is:
If a table also exists in the from clause of the outer criteria, it should not
be added to the from clause of the subselect
NOTE1: This change can change the behaviour of Torque in existing code
NOTE2: Workarounds exist, e.g. defining the FROM clause of the subselect
manually using Criteria.addFrom() or using "new
ColumnImpl(null,null,null,AuthorPeer.AUTHOR_ID.getSqlExpression())" as join
column in the WHERE clause of the subselect.
was:
Currently, it is not easily possible to reference columns in the main select
from a subselect.
For example:
Select authors which have published more than three books
SELECT * FROM author WHERE (SELECT COUNT(*) FROM book WHERE
book.author_id=author.author_id)=1
One would like to achieve this by
Criteria subselect = new Criteria();
subselect.where(BookPeer.AUTHOR_ID, AuthorPeer.AUTHOR_ID);
subselect.addSelectColumn(new Count("*"));
Criteria criteria = new Criteria();
criteria.where(subselect, 1);
List<Author> result = AuthorPeer.doSelect(criteria);
but the SQL results in (note the additional author in the from clause of the
subselect)
SELECT * FROM author WHERE (SELECT COUNT(*) FROM book, author WHERE
book.author_id=author.author_id)=1
So the desired behavior is:
If a table also exists in the from clause of the outer criteria, it should not
be added to the from clause of the subselect
NOTE1: This change can change the behaviour of Torque in existing code
NOTE2: Workarounds exist, e.g. defining the FROM clause of the subselect
manually using Criteria.addFrom() or using "new
ColumnImpl(null,null,null,AuthorPeer.AUTHOR_ID.getSqlExpression())" as join
column in the WHERE clause of the subselect.
> Improve building from clause in subselect
> -----------------------------------------
>
> Key: TORQUE-290
> URL: https://issues.apache.org/jira/browse/TORQUE-290
> Project: Torque
> Issue Type: Improvement
> Components: Runtime
> Affects Versions: 4.0
> Reporter: Thomas Fox
> Assignee: Thomas Fox
> Labels: incompatibleChange
>
> Currently, it is not easily possible to reference columns in the main select
> from a subselect.
> For example, to select authors which have published exactly one book, one can
> use the SQL:
> SELECT * FROM author WHERE (SELECT COUNT(*) FROM book WHERE
> book.author_id=author.author_id)=1
> One would like to achieve this by
> Criteria subselect = new Criteria();
> subselect.where(BookPeer.AUTHOR_ID, AuthorPeer.AUTHOR_ID);
> subselect.addSelectColumn(new Count("*"));
> Criteria criteria = new Criteria();
> criteria.where(subselect, 1);
> List<Author> result = AuthorPeer.doSelect(criteria);
> but the SQL results in (note the additional author in the from clause of the
> subselect)
> SELECT * FROM author WHERE (SELECT COUNT(*) FROM book, author WHERE
> book.author_id=author.author_id)=1
> So the desired behavior is:
> If a table also exists in the from clause of the outer criteria, it should
> not be added to the from clause of the subselect
> NOTE1: This change can change the behaviour of Torque in existing code
> NOTE2: Workarounds exist, e.g. defining the FROM clause of the subselect
> manually using Criteria.addFrom() or using "new
> ColumnImpl(null,null,null,AuthorPeer.AUTHOR_ID.getSqlExpression())" as join
> column in the WHERE clause of the subselect.
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