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From "Dale LaBossiere (JIRA)" <j...@apache.org>
Subject [jira] [Closed] (EDGENT-311) support SELECT without any parameters in JdbcStreams
Date Mon, 28 Nov 2016 21:37:58 GMT

     [ https://issues.apache.org/jira/browse/EDGENT-311?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Dale LaBossiere closed EDGENT-311.
----------------------------------
    Resolution: Not A Problem

> support SELECT without any parameters in JdbcStreams
> ----------------------------------------------------
>
>                 Key: EDGENT-311
>                 URL: https://issues.apache.org/jira/browse/EDGENT-311
>             Project: Edgent
>          Issue Type: Improvement
>          Components: Connectors
>    Affects Versions: Apache Edgent 1.0.0
>            Reporter: Rui Shen
>            Priority: Minor
>
> Now I am trying to run a SELECT statement without parameters (e.g "select id,name,age
from person") using JdbcStreams. But I found there is no straightforward way to do this. Looks
like the APIs of JdbcStreams is designed for only prepared statement with parameters .
> However, I found a workaround to make this - always create a TStream with one tuple but
in the ParameterSetter, does nothing. Although this works, it looks uncomfortable. Are you
going to support this in the future release?
>  
> Topology t = this.newTopology("testSelect_WithParameters");
> JdbcStreams db=new JdbcStreams(ds,(ds)=>
> {ds.getConnection()}
> );
> TStream<String> stream=t.collection(Arrays.asList(new String[]
> {"dummy"}
> )); // to execute the sql, always needs to create a TStream containing one tuple.
> ParameterSetter<String> paramSetter=(s,stmt)->{}; //do nothing here
> ResultsHandler<Object[], JsonObject> rh = (tuple, rs, exc, consumer) -> {};
> db.executeStatement(stream, "select id,name,age from person", paramSetter,rh);
>  



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