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From "Niklas Ekman (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DDLUTILS-118) Modifying columns generates wrong SQL statement
Date Sun, 23 Jul 2006 16:24:15 GMT
    [ http://issues.apache.org/jira/browse/DDLUTILS-118?page=comments#action_12422923 ] 
            
Niklas Ekman commented on DDLUTILS-118:
---------------------------------------

I'm using the DdlUtils trunk, newly checked out and built with ant. And also, I've checked
that it is the org.apache.ddlutils.platform.postgresql.PostgreSqlBuilder that's used when
I call PlatformFactory.createNewPlatformInstance(dataSource) (I called platform.getSqlBuilder().getClass().getName()
to find out). 

According to the help file for PostgreSQL 8.1 the following statement is used for modifying
columns:

ALTER TABLE [ ONLY ] name [ * ]
    action [, ... ]

where action is one of:

   ....
    ALTER [ COLUMN ] column TYPE type [ USING expression ]
   .....

Examples

To change the types of two existing columns in one operation: 

ALTER TABLE distributors
    ALTER COLUMN address TYPE varchar(80),
    ALTER COLUMN name TYPE varchar(100);


This is directly from the help file, I've stripped away stuff that's not important.

> Modifying columns generates wrong SQL statement
> -----------------------------------------------
>
>                 Key: DDLUTILS-118
>                 URL: http://issues.apache.org/jira/browse/DDLUTILS-118
>             Project: DdlUtils
>          Issue Type: Bug
>          Components: Core - PostgreSql
>         Environment: PostgreSQL Database Server 8.1, Windows XP SP2, JDBC driver version
8.1-407 JDBC3
>            Reporter: Niklas Ekman
>         Assigned To: Thomas Dudziak
>            Priority: Minor
>
> When changing a column size the following SQL statement is generated:
> ALTER TABLE testtable MODIFY test VARCHAR(100)
> But according to the PostgreSQL manual it should look like
> ALTER TABLE testtable ALTER COLUMN test TYPE VARCHAR(111)

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