[jira] [Reopened] (CSV-93) Allow the handling of NULL values

["Georg Tsakumagos (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CSV-93?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Georg Tsakumagos reopened CSV-93:
---------------------------------

The current state does not honor the specification. It is not possible to distinguish between an empty string and a null value. The applied solution is not usable in that case.

> Allow the handling of NULL values
> ---------------------------------
>
>                 Key: CSV-93
>                 URL: https://issues.apache.org/jira/browse/CSV-93
>             Project: Commons CSV
>          Issue Type: Improvement
>          Components: Documentation, Parser, Printer
>    Affects Versions: 1.0
>            Reporter: Georg Tsakumagos
>             Fix For: 1.0
>
>         Attachments: CSV-93.diff, patch.txt
>
>
> h5. Requirement
> To use the CSV parser and printer for SQL Dumps it would be nice if they could handle *null* values. 
> h5. Specification
> To distinguish between an *empty* or *null* value empty values always gets quoted to denote an empty string. The absence of an quote denotes a *null* value
> h5. Configuration
> To activate the behavior call the method _withNullObjectPatternEnabled_ of the _CSVFormat_ with parameter _true_.
> h5. Modifications
> See attached patch.
> h5. Example
> This example using as base the _DEFAULT_ _CSVFormat_ modified by the NullObjectPattern behavior.
> || Array-Data || CSV-Data ||
> | \{null,"","A"," "\}; |,"A",""," " |
> | \{"",null,"A"," "\} |"",,"A"," " |
> | \{"","A",null\} |"","A", |
> h5. NULL in DBMS proprietary CSV formats
> || Product || Strategy || Documentation / Link ||
> | PostgreSQL | If NULL should be preserved all non NULL values gets quoted | [PostgreSQL 8.1 Manual|http://www.postgresql.org/docs/8.1/static/sql-copy.html] |
> | MySQL | NULL Values will be replaced by the letters NULL or escaped by \n | not found, verified with MySQL Workbench | 
> | MS SQL | NULL values will be exported as empty strings (no quotes). Strings will be quoted if needed. Import can interpret them as null | [MSDN|http://msdn.microsoft.com/en-us//library/ms187887] | 
> | Oracle | NULL Values will be replaced by the letters NULL | [Manual|http://docs.oracle.com/cd/B25329_01/doc/admin.102/b25107/impexp.htm] |



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