While migrations are sufficient for most needs, there are certain situations that require you to execute the same action over and over again. This could be recompiling procedures, updating materialized views and many other types of housekeeping.
For this reason, Flyway offers you the possibility to hook into its lifecycle by using Callbacks.
These are the events Flyway supports:
|beforeMigrate||Before Migrate runs|
|beforeEachMigrate||Before every single migration during Migrate|
|afterEachMigrate||After every single successful migration during Migrate|
|afterEachMigrateError||After every single failed migration during Migrate|
|afterMigrate||After successful Migrate runs|
|afterMigrateError||After failed Migrate runs|
|beforeUndo Flyway Pro||Before Undo runs|
|beforeEachUndo Flyway Pro||Before every single migration during Undo|
|afterEachUndo Flyway Pro||After every single successful migration during Undo|
|afterEachUndoError Flyway Pro||After every single failed migration during Undo|
|afterUndo Flyway Pro||After successful Undo runs|
|afterUndoError Flyway Pro||After failed Undo runs|
|beforeClean||Before Clean runs|
|afterClean||After successful Clean runs|
|afterCleanError||After failed Clean runs|
|beforeInfo||Before Info runs|
|afterInfo||After successful Info runs|
|afterInfoError||After failed Info runs|
|beforeValidate||Before Validate runs|
|afterValidate||After successful Validate runs|
|afterValidateError||After failed Validate runs|
|beforeBaseline||Before Baseline runs|
|afterBaseline||After successful Baseline runs|
|afterBaselineError||After failed Baseline runs|
|beforeRepair||Before Repair runs|
|afterRepair||After successful Repair runs|
|afterRepairError||After failed Repair runs|
Callbacks can be implemented either in SQL or in Java.
The most convenient way to hook into Flyway’s lifecycle is through SQL callbacks. These are simply sql files in the configured locations following a certain naming convention: the event name followed by the SQL migration suffix.
Using the default settings, Flyway looks in its default locations (<install_dir>/sql) for the Command-line tool)
for SQL files like
Placeholder replacement works just like it does for SQL migrations.
Optionally the callback may also include a description. In that case the callback name is composed of the event name,
the separator, the description and the suffix. Example:
When multiple SQL callbacks for the same event are found, they are executed in the order of their description.
Note: Flyway will also honor any
sqlMigrationSuffixes you have configured, when scanning for SQL callbacks.
If SQL Callbacks aren’t flexible enough for you, you have the option to implement the Callback interface yourself. You can even hook multiple Callback implementations in the lifecycle.
More info: Java-based Callbacks</p>