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From "Georg Tsakumagos (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CSV-93) Allow the handling of NULL values
Date Tue, 31 Jul 2012 07:36:36 GMT

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

Georg Tsakumagos updated CSV-93:
--------------------------------

    Description: 
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 || Doku / 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]
|

  was:
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 || Doku / 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]

    
> 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
>         Attachments: 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 || Doku / 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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