HI
With this approach i will be able to get data types but not the column
names because TypeInformation<?> typeInformation = dataStream.getType()
will return types but not the columns names.
Is there any other way to get the column names from Row?
Thanks
Punit
On 02/08/2017 10:17 AM, Chesnay Schepler wrote:
Hello,
in the JDBC case i would suggest that you extract the schema from the
first Row that your sink receives, create the table, and then
start writing data.
However, keep in mind that Rows can contain null fields; so you may
not be able to extract the entire schema if the first
row has a null somewhere.
Regards,
Chesnay
On 08.02.2017 10:48, Punit Tandel wrote:
Hi Chesnay
Currently that is what i have done, reading the schema from database
in order to create a new table in jdbc database and writing the rows
coming from jdbcinputformat.
Overall i am trying to implement the solution which reads the
streaming data from one source which either could be coming from
kafka, Jdbc, Hive, Hdfs and writing those streaming data to output
source which is again could be any of those.
For a simple use case i have just taken one scenario using jdbc in
and jdbc out, Since the jdbc input source returns the datastream of
Row and to write them into jdbc database we have to create a table
which requires schema.
Thanks
Punit
On 02/08/2017 08:22 AM, Chesnay Schepler wrote:
Hello,
I don't understand why you explicitly need the schema since the
batch JDBCInput-/Outputformats don't require it.
That's kind of the nice thing about Rows.
Would be cool if you could tell us what you're planning to do with
the schema :)
In any case, to get the schema within the plan then you will have to
query the DB and build it yourself. Note that this
is executed on the client.
Regards,
Chesnay
On 08.02.2017 00:39, Punit Tandel wrote:
Hi Robert
Thanks for the response, So in near future release of the flink
version , is this functionality going to be implemented ?
Thanks
On 02/07/2017 04:12 PM, Robert Metzger wrote:
Currently, there is no streaming JDBC connector.
Check out this thread from last year:
http://apache-flink-mailing-list-archive.1008284.n3.nabble.com/JDBC-Streaming-Connector-td10508.html
On Mon, Feb 6, 2017 at 5:00 PM, Ufuk Celebi <u...@apache.org> wrote:
I'm not sure how well this works for the streaming API. Looping in
Chesnay, who worked on this.
On Mon, Feb 6, 2017 at 11:09 AM, Punit Tandel
<punit.tan...@ericsson.com> wrote:
> Hi ,
>
> I was looking into flink streaming api and trying to
implement the solution
> for reading the data from jdbc database and writing them to
jdbc databse
> again.
>
> At the moment i can see the datastream is returning Row from
the database.
> dataStream.getType().getGenericParameters() retuning an
empty list of
> collection.
>
> I am right now manually creating a database connection and
getting the
> schema from ResultMetadata and constructing the schema for
the table which
> is a bit heavy operation.
>
> So is there any other way to get the schema for the table in
order to create
> a new table and write those records in the database ?
>
> Please let me know
>
> Thanks
> Punit
