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From "Diego Trombetta (JIRA)" <ibatis-...@incubator.apache.org>
Subject [jira] Commented: (IBATIS-264) Include with parameter
Date Wed, 21 Jun 2006 13:59:31 GMT
    [ http://issues.apache.org/jira/browse/IBATIS-264?page=comments#action_12417112 ] 

Diego Trombetta commented on IBATIS-264:

I'm facing the same problem.
My use case looks like this: I need to build a tree that represents the Bill of Materials
of an item.
Each time that I perform an inquiry to obtain the components of the current item I need also
to know
if the components are "final" components (leaves of the tree) or intermedate components (nodes
in the tree);
therefore I need to join the table of the components with itself (!) repeating the filter
clause on the same
columns but using different aliases.

I don't think this is a minor improvement....

Any news about it?

> Include with parameter
> ----------------------
>          Key: IBATIS-264
>          URL: http://issues.apache.org/jira/browse/IBATIS-264
>      Project: iBatis for Java
>         Type: Improvement

>   Components: SQL Maps
>     Versions: 2.1.7
>     Reporter: Nils Winkler
>     Priority: Minor

> I have the following problem: I include the same SQL snippet from
> multiple select statements, some of them for completely unrelated
> tables. This is done because these tables contain quite a few columns
> with the same names in both tables.
> <sql id="inc">
>     name,
>     value,
>     foo,
>     bar
> </sql>
> <select id="loadA">
>     select id,
>     <include refid="inc" />
>     from A
> </select>
> <select id="loadB">
>     select id,
>     <include refid="inc" />
>     from B
> </select>
> When including the list of columns, it would be quite handy to add a
> parameter to the include, for example to set a table alias in case I
> have a join between tables:
> <select id="loadA">
>     select a.id, b.id,
>     <include refid="inc" />
>     from A a
>     inner join B b on (b.id = a.id)
>     where b.baz = #baz#
> </select>
> In the above query, "name", "value" etc are no longer unique in the
> query, most of the time you end up with the wrong values.
> It would be great if I would be able to pass in a parameter to the
> include, e.g.:
> <select id="loadA">
>     select a.id, b.id,
>     <include refid="inc" param="a."/>
>     from A a
>     inner join B b on (b.id = a.id)
>     where b.baz = #baz#
> </select>
> so I could have the SQL snippet defined like this:
> <sql id="inc">
>     $param$name,
>     $param$value,
>     $param$foo,
>     $param$bar
> </sql>
> This way, all of the statements would still work and I could make sure
> that the correct columns are used in each case.

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