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Gradle Task: flywayValidate

Validate applied migrations against resolved ones (on the filesystem or classpath) to detect accidental changes that may prevent the schema(s) from being recreated exactly.

Validation fails if

  • differences in migration names, types or checksums are found
  • versions have been applied that aren’t resolved locally anymore
  • versions have been resolved that haven’t been applied yet

validate

Usage

> gradle flywayValidate

Configuration

Parameter Required Default Description
url YES The jdbc url to use to connect to the database
driver NO Auto-detected based on url The fully qualified classname of the jdbc driver to use to connect to the database
user NO The user to use to connect to the database
password NO The password to use to connect to the database
connectRetries NO 0 The maximum number of retries when attempting to connect to the database. After each failed attempt, Flyway will wait 1 second before attempting to connect again, up to the maximum number of times specified by connectRetries.
initSql NO none The SQL statements to run to initialize a new database connection immediately after opening it.
schemas NO The default schema for the database connection The schemas managed by Flyway. These schema names are case-sensitive.

Consequences:

  • Flyway will automatically attempt to create all these schemas, unless the first one already exists.
  • The first schema in the list will be automatically set as the default one during the migration.
  • The first schema in the list will also be the one containing the schema history table.
  • The schemas will be cleaned in the order of this list.
  • If Flyway created them, the schemas themselves will as be dropped when cleaning.
table NO flyway_schema_history The name of Flyway's schema history table.
By default (single-schema mode) the schema history table is placed in the default schema for the connection provided by the datasource.
When the flyway.schemas property is set (multi-schema mode), the schema history table is placed in the first schema of the list.
locations NO filesystem:src/main/resources/db/migration Locations to scan recursively for migrations. The location type is determined by its prefix.
Unprefixed locations or locations starting with classpath: point to a package on the classpath and may contain both SQL and Java-based migrations.
Locations starting with filesystem: point to a directory on the filesystem, may only contain SQL migrations and are only scanned recursively down non-hidden directories.
sqlMigrationPrefix NO V

The file name prefix for versioned SQL migrations.

Versioned SQL migrations have the following file name structure: prefixVERSIONseparatorDESCRIPTIONsuffix , which using the defaults translates to V1.1__My_description.sql
undoSqlMigrationPrefix Flyway Pro NO U

The file name prefix for undo SQL migrations.

Undo SQL migrations are responsible for undoing the effects of the versioned migration with the same version.

They have the following file name structure: prefixVERSIONseparatorDESCRIPTIONsuffix , which using the defaults translates to U1.1__My_description.sql
repeatableSqlMigrationPrefix NO R

The file name prefix for repeatable SQL migrations.

Repeatable SQL migrations have the following file name structure: prefixSeparatorDESCRIPTIONsuffix , which using the defaults translates to R__My_description.sql
sqlMigrationSeparator NO __ The file name separator for Sql migrations
sqlMigrationSuffixes NO .sql

The file name suffixes for SQL migrations.

SQL migrations have the following file name structure: prefixVERSIONseparatorDESCRIPTIONsuffix , which using the defaults translates to V1_1__My_description.sql

Multiple suffixes (like .sql,.pkg,.pkb) can be specified for easier compatibility with other tools such as editors with specific file associations.
encoding NO UTF-8 The encoding of Sql migrations
placeholderReplacement NO true Whether placeholders should be replaced
placeholders NO Placeholders to replace in Sql migrations
placeholderPrefix NO ${ The prefix of every placeholder
placeholderSuffix NO } The suffix of every placeholder
resolvers NO Fully qualified class names of custom MigrationResolver implementations to be used in addition to the built-in ones for resolving Migrations to apply.
skipDefaultResolvers NO false Whether default built-in resolvers (sql, jdbc and spring-jdbc) should be skipped. If true, only custom resolvers are used.
callbacks NO Fully qualified class names of Callback implementations to use to hook into the Flyway lifecycle.
skipDefaultCallbacks NO false Whether default built-in callbacks (sql) should be skipped. If true, only custom callbacks are used.
target NO latest version The target version up to which Flyway should consider migrations. Migrations with a higher version number will be ignored. The special value current designates the current version of the schema.
outOfOrder NO false Allows migrations to be run "out of order".

If you already have versions 1 and 3 applied, and now a version 2 is found, it will be applied too instead of being ignored.

cleanOnValidationError NO false Whether to automatically call clean or not when a validation error occurs.

This is exclusively intended as a convenience for development. Even tough we strongly recommend not to change migration scripts once they have been checked into SCM and run, this provides a way of dealing with this case in a smooth manner. The database will be wiped clean automatically, ensuring that the next migration will bring you back to the state checked into SCM.

Warning ! Do not enable in production !
ignoreMissingMigrations NO false Ignore missing migrations when reading the schema history table. These are migrations that were performed by an older deployment of the application that are no longer available in this version. For example: we have migrations available on the classpath with versions 1.0 and 3.0. The schema history table indicates that a migration with version 2.0 (unknown to us) has also been applied. Instead of bombing out (fail fast) with an exception, a warning is logged and Flyway continues normally. This is useful for situations where one must be able to deploy a newer version of the application even though it doesn't contain migrations included with an older one anymore.
ignoreIgnoredMigrations NO false Ignore ignored migrations when reading the schema history table. These are migrations that were added in between already migrated migrations in this version. For example: we have migrations available on the classpath with versions from 1.0 to 3.0. The schema history table indicates that version 1 was finished on 1.0.15, and the next one was 2.0.0. But with the next release a new migration was added to version 1: 1.0.16. Such scenario is ignored by migrate command, but by default is rejected by validate. When ignoreIgnoredMigrations is enabled, such case will not be reported by validate command. This is useful for situations where one must be able to deliver complete set of migrations in a delivery package for multiple versions of the product, and allows for further development of older versions.
ignorePendingMigrations NO false Ignore pending migrations when reading the schema history table. These are migrations that are available but have not yet been applied. This can be useful for verifying that in-development migration changes don't contain any validation-breaking changes of migrations that have already been applied to a production environment, e.g. as part of a CI/CD process, without failing because of the existence of new migration versions.
ignoreFutureMigrations NO true Ignore future migrations when reading the schema history table. These are migrations that were performed by a newer deployment of the application that are not yet available in this version. For example: we have migrations available on the classpath up to version 3.0. The schema history table indicates that a migration to version 4.0 (unknown to us) has already been applied. Instead of bombing out (fail fast) with an exception, a warning is logged and Flyway continues normally. This is useful for situations where one must be able to redeploy an older version of the application after the database has been migrated by a newer one.
licenseKey Flyway Pro NO Flyway's license key

Sample configuration

flyway {
    driver = 'org.hsqldb.jdbcDriver'
    url = 'jdbc:hsqldb:file:/db/flyway_sample;shutdown=true'
    user = 'SA'
    password = 'mySecretPwd'
    connectRetries = 10
    initSql = 'SET ROLE \'myuser\''
    schemas = ['schema1', 'schema2', 'schema3']
    table = 'schema_history'
    locations = ['classpath:migrations1', 'migrations2', 'filesystem:/sql-migrations']
    sqlMigrationPrefix = 'Migration-'
    undoSqlMigrationPrefix = 'downgrade'
    repeatableSqlMigrationPrefix = 'RRR'
    sqlMigrationSeparator = '__'
    sqlMigrationSuffixes = ['.sql', '.pkg', '.pkb']
    encoding = 'ISO-8859-1'
    placeholderReplacement = true
    placeholders = [
        'aplaceholder' : 'value',
        'otherplaceholder' : 'value123'
    ]
    placeholderPrefix = '#['
    placeholderSuffix = ']'
    resolvers = ['com.mycompany.proj.CustomResolver', 'com.mycompany.proj.AnotherResolver']
    skipDefaultResolvers = false
    callbacks = ['com.mycompany.proj.CustomCallback', 'com.mycompany.proj.AnotherCallback']
    skipDefaultCallbacks = false
    target = '1.1'
    outOfOrder = false
    cleanOnValidationError = false
    ignoreMissingMigrations = false
    ignoreIgnoredMigrations = false
    ignorePendingMigrations = false
    ignoreFutureMigrations = false
}

Sample output

> gradle flywayValidate -i

Validated 5 migrations (execution time 00:00.030s)

Gradle: undo