Insert/select...

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Hi all,

I have added a new SInsertSelect construct in SimpleORM.

This is a low level tool to generate insert into ... select ... style=20
sql based on Metas and SQueryTransient.
This has the advantage of:
- using object oriented SRecordMeta and SFieldScalar to build your query
- delegating the work to the database, which will be the most efficient=20
at this task

But keep in mind this is a low level trick, closer to jdbc than to an=20
ORM tool.
In particular:
- this will bypass any validation done by=20
SRecordInstance.onValidateRecord().


So that said, here is how it works... Lets say you have a sales order=20
table, and a stats tables.
You can do the following:

SQueryTransient qryTrs =3D new SQueryTransient(new SQuery<Order>(Order.meta=
));
qryTrs.groupBy(Order.productId).groupBy(Order.month).avg(Order.amount).sele=
ctRaw("nextval('mysequence')");

SInsertSelect<Stats> insSel =3D new SInsertSelect(Stats.meta, qryTrs);
insSel.addField(Stats.productId).addField(Stats.month).addField(Stats.avera=
geOrder).addField(Stats.id);

session.begin();
session.rawInsertSelectNoFlush(insSel);
session.commit();


Notice the method is called rawInsertSelectNoFlush to reflect the fact=20
that this is a low level construct.
Also notice that the sequence is added using a selectRaw method, and is=20
database dependant (the example will work with Postgresql).

Hope this can be useful. Any comment is welcome.

Franck


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