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https://issues.apache.org/jira/browse/DERBY-2800?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Anurag Shekhar updated DERBY-2800:
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Attachment: derby-2800.diff
ClobStreamControl provides most the the method required to implement
Clob.truncate. This patch does implements a few new methods for efficiency.
File Modified
java/engine/org/apache/derby/impl/jdbc/EmbedClob.java
* makeWritableClobClone (long length)
This is a new overload of makeWritableClobClone. This method is to avoid
copying entire StoreStreamClob to ClobStreamControl and then performing
truncate on it. This methods calls out the similar new method
ClobStreamControl.cloneClobContent to copy specified number of char to the new
InternalClob.
* truncate (long len)
Removed notImplimented Exception. Calling makeWritableClobClone in case of
StoreStreamClob and InternalClob.truncate in case of writable clob.
java/engine/org/apache/derby/impl/jdbc/ClobStreamControl.java
* copyClobContent(InternalClob clob, long length)
This is a new method which creates a new Internal copy with only part of the
clob. It copies length chars to the new InternalClob
* cloneClobContent(String dbName,
ConnectionChild conChild,
InternalClob clob,
long length)
This new overload calls out new copyClobContent to make a clone with only part
of the clob data.
*truncate (long)
This method had a small bug. It was treating the parameter as byte length but
the doc says its char length. Added code to convert it into byte length.
java/engine/org/apache/derby/impl/jdbc/LOBStreamControl.java
*copyData (InputStream, long)
Modified to take care of stream.read when the read bytes are lesser than number
bytes asked for.
java/testing/org/apache/derbyTesting/functionTests/tests/jdbcapi/ClobTruncateTest.java
Added a new test suite to test Clob.truncate. Right now its enabled for
embedded driver only as the length chaching on network client causes length
check to fail after truncate.
java/testing/org/apache/derbyTesting/functionTests/tests/jdbcapi/_Suite.java
added entry for
java/testing/org/apache/derbyTesting/functionTests/tests/jdbcapi/ClobTruncateTest.java
> Implement Clob.truncate for embedded driver
> -------------------------------------------
>
> Key: DERBY-2800
> URL: https://issues.apache.org/jira/browse/DERBY-2800
> Project: Derby
> Issue Type: Sub-task
> Components: JDBC
> Affects Versions: 10.3.0.0
> Reporter: Anurag Shekhar
> Assignee: Anurag Shekhar
> Attachments: derby-2800.diff
>
>
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