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https://issues.apache.org/jira/browse/NIFI-5121?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matt Burgess reassigned NIFI-5121:
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Assignee: Matt Burgess
> DBCPService should support passing in an attribute map when obtaining a
> connection
> ----------------------------------------------------------------------------------
>
> Key: NIFI-5121
> URL: https://issues.apache.org/jira/browse/NIFI-5121
> Project: Apache NiFi
> Issue Type: Improvement
> Affects Versions: 1.6.0
> Reporter: Bryan Bende
> Assignee: Matt Burgess
> Priority: Minor
>
> Many users have asked for a way to obtain dynamic database connections.
> Essentially being able to use the existing SQL processors like PutSQL, etc,
> and be able to pass in flow file attributes to the DBCPService to obtain a
> connection based on the attributes.
> The current DBCPService interface has a single method:
> {code:java}
> Connection getConnection(){code}
> Since there is no way for a processor to pass in any information, we can add
> an additional method to this interface and make the interface like this:
> {code:java}
> Connection getConnection(Map<String,String> attributes)
> default Connection getConnection() {
> return getConnection(Collections.emptyMap());
> }{code}
> This would leave it up to the implementations of DBCPService interface to
> decide if they want to use the attributes map for anything.
> The DBCPConnectionPool would not use the attributes map and would continue to
> provide a fixed connection pool against a single data source.
> A new implementation can then be created that somehow maintains multiple
> connection pools, or creates connections on the fly.
> The PropertyDescriptors in each implementation should indicate how they use
> expression language.
> For example, since DBCPConnectionPool will not use the attribute map, it's
> property descriptors will indicate expression language scope as variable
> registry only:
> {code:java}
> .expressionLanguageSupported(ExpressionLanguageScope.VARIABLE_REGISTRY){code}
> The dynamic implementations should indicate:
> {code:java}
> .expressionLanguageSupported(ExpressionLanguageScope.FLOWFILE_ATTRIBURES){code}
>
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