All Known Implementing Classes:

BaseJavaMigration, ScriptMigration
```
public interface JavaMigration
```
Interface to be implemented by Java-based Migrations.
Java-based migrations are a great fit for all changes that can not easily be expressed using SQL.

These would typically be things like
- BLOB & CLOB changes
- Advanced bulk data changes (Recalculations, advanced format changes, …)
Migration classes implementing this interface will be automatically discovered when placed in a location on the classpath.

Most users will be better served by subclassing subclass BaseJavaMigration instead of implementing this interface directly, as BaseJavaMigration encourages the use of MigrateDB 's default naming convention and comes with sensible default implementations of all methods (except migrate of course) while at the same time also providing better isolation against future additions to this interface.

Method Summary

All Methods Instance Methods Abstract Methods Default Methods Deprecated Methods
Modifier and Type	Method	Description
`boolean`	`canExecuteInTransaction()`	Whether the execution should take place inside a transaction.
`default @Nullable Integer`	`getChecksum()`	Deprecated, for removal: This API element is subject to removal in a future version. Implement `getChecksum(Configuration)` instead.
`default @Nullable Checksum`	`getChecksum(Configuration configuration)`
`String`	`getDescription()`
`@Nullable Version`	`getVersion()`
`boolean`	`isBaselineMigration()`	Whether this is a baseline migration.
`void`	`migrate(Context context)`	Executes this migration.

- Method Detail
  - getVersion
```
@Nullable Version getVersion()
```
    Returns:
    
    The version of the schema after the migration is complete. null for repeatable migrations.
  - getDescription
```
String getDescription()
```
    Returns:
    
    The description of this migration for the migration history. Never null.
  - getChecksum
```
@Deprecated(forRemoval=true)
default @Nullable Integer getChecksum()
```
    Deprecated, for removal: This API element is subject to removal in a future version.
    Implement getChecksum(Configuration) instead.
    
    Returns:
    
    The checksum of this migration.
  - getChecksum
```
default @Nullable Checksum getChecksum(Configuration configuration)
```
    Returns:
    
    The checksum of this migration, null to disable checksum verification.
  - isBaselineMigration
```
boolean isBaselineMigration()
```
    Whether this is a baseline migration.
    
    Returns:
    
    true if it is, false if not.
  - canExecuteInTransaction
```
boolean canExecuteInTransaction()
```
    Whether the execution should take place inside a transaction. Almost all implementations should return true. This however makes it possible to execute certain migrations outside a transaction. This is useful for databases like PostgreSQL and SQL Server where certain statement can only execute outside a transaction.
    
    Returns:
    
    true if a transaction should be used (highly recommended), or false if not.
  - migrate
```
void migrate(Context context)
      throws Exception
```
    Executes this migration. The execution will automatically take place within a transaction, when the underlying database supports it and the canExecuteInTransaction returns true.
    
    Parameters:
    
    context - The context relevant for this migration, containing things like the JDBC connection to use and the current MigrateDB configuration.
    
    Throws:
    
    Exception - when the migration failed.

Interface JavaMigration

Method Summary

Method Detail

getVersion

getDescription

getChecksum

getChecksum

isBaselineMigration

canExecuteInTransaction

migrate