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https://issues.apache.org/jira/browse/DERBY-5042?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12994697#comment-12994697
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Knut Anders Hatlen commented on DERBY-5042:
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> Does/will ALTER TABLE support a change from SMALLINT to BOOLEAN?
ALTER TABLE doesn't support changing the type of the column at all, currently.
It only allows changing the length of those types that have a length attribute
(VARCHAR, BLOB, CLOB, etc).
ij> create table t(x smallint);
0 rows inserted/updated/deleted
ij> insert into t values 0,1,1,0,1,0,0,1;
8 rows inserted/updated/deleted
ij> alter table t alter column x set data type boolean;
ERROR 42Z15: Invalid type specified for column 'X'. The type of a column may
not be changed.
> ResultSet.updateBoolean() on new BOOLEAN type throws exception
> --------------------------------------------------------------
>
> Key: DERBY-5042
> URL: https://issues.apache.org/jira/browse/DERBY-5042
> Project: Derby
> Issue Type: Bug
> Affects Versions: 10.7.1.1
> Environment: OS X 10.6.5, Java 1.6
> Reporter: Brett Wooldridge
> Assignee: C.S. Nirmal J. Fernando
>
> I am encountering an error trying to update a BOOLEAN type through an
> updatable ResultSet. My table looks like this:
> CREATE TABLE file_store (
> path VARCHAR(255) NOT NULL,
> network VARCHAR(32) NOT NULL,
> file_blob BLOB,
> file_md5 VARCHAR(32),
> is_directory BOOLEAN NOT NULL DEFAULT false,
> PRIMARY KEY (path, network)
> );
> My SQL looks like this:
> SELECT path, network, is_directory FROM file_store
> WHERE path=? AND network=? AND is_directory=true FOR UPDATE OF path, network,
> is_directory
> My Java code looks like this:
> ...
> resultSet.moveToInsertRow();
> resultSet.updateString("path", dirPath);
> resultSet.updateString("network", network);
> resultSet.updateBoolean("is_directory", true);
> resultSet.insertRow();
> An exception is thrown in the call to updateBoolean() as follows:
> java.sql.SQLException: An attempt was made to put a data value of type 'byte'
> into a data value of type 'BOOLEAN'.
> It's a shame, I was looking forward to using the new BOOLEAN type before I
> roll out the next version of our software. For now I will fallback to
> SMALLINT. Does/will ALTER TABLE support a change from SMALLINT to BOOLEAN?
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