com.atlassian.confluence.upgrade.upgradetask
Class AddUniqueAttachmentIdConstraintToAttachmentDataUpgradeTask

java.lang.Object
  com.atlassian.confluence.upgrade.AbstractUpgradeTask
      com.atlassian.confluence.upgrade.upgradetask.AddUniqueAttachmentIdConstraintToAttachmentDataUpgradeTask

All Implemented Interfaces:

DatabaseUpgradeTask, UpgradeTask

public class AddUniqueAttachmentIdConstraintToAttachmentDataUpgradeTask
extends AbstractUpgradeTask
implements DatabaseUpgradeTask

This task adds a unique constraint to the AttachmentId column on the AttachmentData table. Having multiple records for the one attachment id is an invalid state that causes errors (CONF-7882). In order to create the constraint this task does the following:

1. Deletes any attachmentdata records with no attachmentid.
2. Whenever there are multiple attachmentdata records for the same attachmentid, deletes all but the one with the lowest attachmentid.
3. For SQL Server only, removes all the indexes on the attachmentid column in the attachmentdata table.
4. Adds a not-null constraint on the attachmentid table, since unique constraints must be not-null on some DBs.
5. Adds the unique constraint on the attachmentid table.

This task does not need to run in an import or on setup of a new system because the constraints are included in the hibernate schema. It MUST run pre-upgrade because it relies on the SchemaHelper.updateSchemaIfNeeded() to re-create the indices in Sql Server. See dropIndicesFromSqlServer(ConfluenceHibernateConfig).

Constructor Summary

AddUniqueAttachmentIdConstraintToAttachmentDataUpgradeTask(net.sf.hibernate.SessionFactory sessionFactory, AlterTableExecutor alterTableExecutor, DdlExecutor ddlExecutor, org.springframework.transaction.PlatformTransactionManager transactionManager)

Method Summary

void	doUpgrade() Perform the upgrade.
String	getBuildNumber()
String	getShortDescription() A short (<50 chars) description of the upgrade action

Methods inherited from class com.atlassian.confluence.upgrade.AbstractUpgradeTask

addAllErrors, addError, addError, getConstraint, getErrors, setBuildNumber, validate

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface com.atlassian.confluence.upgrade.UpgradeTask

getConstraint, getErrors, validate

Constructor Detail

AddUniqueAttachmentIdConstraintToAttachmentDataUpgradeTask

public AddUniqueAttachmentIdConstraintToAttachmentDataUpgradeTask(net.sf.hibernate.SessionFactory sessionFactory,
                                                                  AlterTableExecutor alterTableExecutor,
                                                                  DdlExecutor ddlExecutor,
                                                                  org.springframework.transaction.PlatformTransactionManager transactionManager)

Method Detail

getBuildNumber

public String getBuildNumber()

Specified by:

getBuildNumber in interface UpgradeTask

Overrides:

getBuildNumber in class AbstractUpgradeTask

Returns:

The build number that this upgrade is applicable to

getShortDescription

public String getShortDescription()

Description copied from interface: UpgradeTask

A short (<50 chars) description of the upgrade action

Specified by:

getShortDescription in interface UpgradeTask

Overrides:

getShortDescription in class AbstractUpgradeTask

doUpgrade

public void doUpgrade()
               throws Exception

Description copied from interface: UpgradeTask

Perform the upgrade.

Specified by:

doUpgrade in interface UpgradeTask

Throws:

Exception