public Interface Change

Represent an empty array of Change

Validate that this change executed successfully against the given database. This will check that the update completed at a high level plus check details of the change. For example, a change to add a column will check that the column exists plus data type, default values, etc.

This method will be called by the changelog parsing process after all of the properties have been set to allow the task to do any additional initialization logic.

Calculates the checksum of this Change based on the current configuration. The checksum should take into account all settings that would impact what actually happens to the database and NOT include any settings that do not impact the actual execution of the change.

Generates the SqlStatement objects that would roll back the change.

Exceptions

RollbackImpossibleException:

if rollback is not supported for this change

Returns true if this change reads data from the database or other sources that would change during the course of an update in the generateRollbackStatements(Database) method. If true, this change cannot be used in an updateSql-style commands because Liquibase cannot know the SqlStatement objects until all changeSets prior have been actually executed.

Generates the SqlStatement objects required to run the change for the given database.

Returns true if this change reads data from the database or other sources that would change during the course of an update in the generateStatements(Database) method. If true, this change cannot be used in an updateSql-style commands because Liquibase cannot know the SqlStatement objects until all changeSets prior have been actually executed.

Returns example DatabaseObject instances describing the objects affected by this change. This method is not called during the normal execution of a changelog, but can be used as metadata for documentation or other integrations.

Returns the changeSet this Change is part of. Will return null if this instance was not constructed as part of a changelog file.

Confirmation message to be displayed after the change is executed. Should include relevant configuration settings to make it as helpful as possible. This method may be called outside the changelog execution process, such as in documentation generation.

Short, scannable description for the DATABASECHANGELOG.DESCRIPTION column

Exceptions

ParsedNodeException:

if there is an error processing ChangeVisitor

Sets the changeSet this Change is a part of. Called automatically by Liquibase during the changelog parsing process.

Sets the ResourceAccessor that should be used for any file and/or resource loading needed by this Change. Called automatically by Liquibase during the changelog parsing process.

Return true if this Change object supports the passed database. Used by the ChangeLog parsing process.

Returns true if this can change be rolled back for the given database.

Generate errors based on the configured Change instance. If there are any validation errors, changelog processing will normally not occur. Can return null or empty ValidationErrors object when there are no errors.

Generates warnings based on the configured Change instance. Warnings do not stop changelog execution, but are passed along to the end user for reference. Can return null or an empty Warnings object when there are no warnings.