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From Alexey Kuznetsov <akuznet...@gridgain.com>
Subject Re: CacheJdbcPojoStore
Date Sat, 25 Apr 2015 02:11:26 GMT
Issue created: https://issues.apache.org/jira/browse/IGNITE-812

On Sat, Apr 25, 2015 at 4:21 AM, Dmitriy Setrakyan <dsetrakyan@apache.org>
wrote:

> On Fri, Apr 24, 2015 at 12:04 PM, Alexey Kuznetsov <
> akuznetsov@gridgain.com>
> wrote:
>
> > Because of mapping to database.
> > For example, some table could be named T1 but mapped to Person.
> > Some column in that table could be named COL1 but mapped to Person.name.
> > Some column in that table could has type integer but mapped to any
> numeric
> > type supported by java (conversion will be done by JDBC).
> > Also we could map to primitives or to objects (for example: int /
> Integer).
> > Also some cols should not be mapped at all.
> >
> > But I think it is good idea to not specify any mapping if Table and
> columns
> > fully corresponds to java side.
> >
> > I will create issue to support such case.
> >
>
> I agree. We should make the simple things simple to configure.
>
>
> >
> >
> > On Fri, Apr 24, 2015 at 10:40 PM, Dmitriy Setrakyan <
> dsetrakyan@apache.org
> > >
> > wrote:
> >
> > > I am a bit confused. Why can't we provide just a simple list of classes
> > to
> > > CacheJdbcPojoStore? Why do we need to define the whole metadata?
> > >
> > > On Fri, Apr 24, 2015 at 10:28 AM, Alexey Kuznetsov <
> > > akuznetsov@gridgain.com>
> > > wrote:
> > >
> > > > CacheJdbcPojoStore uses CacheTypeMetadata to describe connection
> > between
> > > > database table and POJO.
> > > >
> > > > In CacheTypeMetadata user should specify DB schema name, table name,
> > key
> > > > class name, value class name and how these classes mapped to DB
> table.
> > > > Using this information CacheJdbcPojoStore will find getters and
> setters
> > > in
> > > > POJO via reflection (assuming that POJO is a Java bean).
> > > >
> > > > About documentation:
> > > >     http://apacheignite.readme.io/v1.0/docs/automatic-persistence
> > > >     examples\schema-import\README.txt
> > > >
> > > >
> > > >
> > > > On Fri, Apr 24, 2015 at 8:35 PM, Dmitriy Setrakyan <
> > > dsetrakyan@apache.org>
> > > > wrote:
> > > >
> > > > > I have several questions about CacheJdbcPojoStore.
> > > > >
> > > > > 1. According to javadoc, this store uses reflection to analyze the
> > > > classes,
> > > > > but there is no setter to set the classes. What is the way to do
> it?
> > > Can
> > > > we
> > > > > make sure that javadoc reflects that?
> > > > >
> > > > > 2. Is there an example or documentation for it outside of the
> > javadoc?
> > > > >
> > > > > D.
> > > > >
> > > >
> > > >
> > > >
> > > > --
> > > > Alexey Kuznetsov
> > > > GridGain Systems
> > > > www.gridgain.com
> > > >
> > >
> >
> >
> >
> > --
> > Alexey Kuznetsov
> > GridGain Systems
> > www.gridgain.com
> >
>



-- 
Alexey Kuznetsov
GridGain Systems
www.gridgain.com

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