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From "Rick Shaw (JIRA)" <j...@apache.org>
Subject [jira] [Issue Comment Edited] (CASSANDRA-2926) The JDBC Suite should provide a simple DatabaseMetaData implementation
Date Mon, 22 Aug 2011 22:58:29 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-2926?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13089114#comment-13089114
] 

Rick Shaw edited comment on CASSANDRA-2926 at 8/22/11 10:57 PM:
----------------------------------------------------------------

With 176 methods, what are the odds I guess right on all :) So let me say first off, I be
glad to change any values. But here are my excuses...

- allTablesAreSelectable -- references whether the user can use all the tables returned by
{{getTables()}}, which is not currently supported. We return an empty {{ResultSet}}. Since
we did not return any tables in the result from that method call I went with {{false}}. 

- getMaxBinaryLiteralLength
- getMaxCharLiteralLength

Zero (0) implies no limit or the limit was unknown, and as I did not know of any such limit
except practicality I went with zero. I could not find any documented limits but if I missed
them somewhere I will gladly put them in.

- [own|others][Deletes|Inserts|Updates]AreVisible -- no good excuse for them being {{false}}.
I must have been confused by all the questions running together. I will make them {{true}}
in the subsequent patch.

- supportsUnion -- There is no {{UNION}} operator in CQL? I answered {{false}}? 




      was (Author: ardot):
    With 176 methods, what are the odds I guess right on all :) So let me say first off, I
be glad to change any values. But here are my excuses...

- allTablesAreSelectable -- references whether the user can use all the tables returned by
{{getTables()}}, which is not currently supported. We return an empty {{ResultSet}}. Since
we did not return any tables in the result from that method call I went with {{false}}. 

- getMaxBinaryLiteralLength
- getMaxCharLiteralLength

Zero (0) implies no limit or the limit was unknown, and as I did not know of any such limit
except practicality I went with zero. I could not find any documented limits but if I missed
them somewhere I will gladly put them in.

- [own|others][Deletes|Inserts|Updates]AreVisible -- no good excuse for them being {{false}}.
I must have been confused by all the questions running together. I will make them {{true}}
in the subsequent patch.

- supportsUnion -- There is no {{UNION}} statement type in CQL? I answered {{false}}? 



  
> The JDBC Suite should provide a simple DatabaseMetaData implementation
> ----------------------------------------------------------------------
>
>                 Key: CASSANDRA-2926
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2926
>             Project: Cassandra
>          Issue Type: Sub-task
>          Components: Drivers
>    Affects Versions: 0.8.1, 0.8.4
>            Reporter: Rick Shaw
>            Assignee: Rick Shaw
>            Priority: Minor
>              Labels: CQL, JDBC
>             Fix For: 0.8.5
>
>         Attachments: add-database-metadata-v1.txt
>
>
> The {{DatabaseMetaData}} interface provides access to meta-data information about the
JDBC Driver implementation and the DB that it supports. This class would usually be used by
tooling to discover the extended capabilities of the Driver Suite.
> A very basic implementation is planned initially. Non-static metadata about Keyspaces
and Column Families can be provided in enhanced versions.

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