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From "Yair Lenga (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-4555) Expand SYSCS_IMPORT_TABLE to accept CSV file with header lines
Date Mon, 22 Feb 2010 15:46:27 GMT

    [ https://issues.apache.org/jira/browse/DERBY-4555?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12836671#action_12836671

Yair Lenga commented on DERBY-4555:

I really like the idea of exposing "Bulk Insert" to JDBC Clients. We have chosen the "SYSCS_IMPORT_TABLE"
approach over plain SQL, because it deliver 10X speedup of upload time. In our case,  we have
20K rows of 30 columns: we went from ~40 seconds to less then 5 seconds.

In addition, I would like to emphasize that adding bulk import does not mean that we do not
want the direct upload from delimited format. CSV format is the dominant input format. Being
able to ship it "as-is" is a big helper, when we are writing data integration jobs with MS*
products, uploading "BCP" like data from other databases, for test scripts, etc.

I think that both "Bulk Insert" feature, and more flexible delimited file upload are important

> Expand SYSCS_IMPORT_TABLE to accept CSV file with header lines
> --------------------------------------------------------------
>                 Key: DERBY-4555
>                 URL: https://issues.apache.org/jira/browse/DERBY-4555
>             Project: Derby
>          Issue Type: Improvement
>          Components: Miscellaneous
>            Reporter: Yair Lenga
> The SYSCS_IMPORT_TABLE (and SYSCS_IMPORT_DATA) function allow import of data from external
resources. In general, they can process CSV files that created with various tools - with one
exception: the header line.
> While there is no accepted standard, most tools will include a header line in the CSV
file with column names. This convention is supported in Excel and many other tools.
> My Request: extend the SYSCS_IMPORT_TABLe and SYSCS_IMPORT_DATA (and other related procedures)
to include an extra indicator for the number of header lines to be ignored.
> As an extra bonus it will be help is the SYSCS_IMPORT_DATA will accept column names (instead
of column indexes) in the 'COLUMNINDEXES' arguments. E.g., it should be possible to indicate
COLUMNINDEXES of '1,3,sales,5,'. This feature will make it significantly easier to handle
cases where the external input files is extended to include additional columns.

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