org.dspace.storage.rdbms.migration

Class V5_0_2014_09_25__DS_1582_Metadata_For_All_Objects_drop_constraint

java.lang.Object

org.dspace.storage.rdbms.migration.V5_0_2014_09_25__DS_1582_Metadata_For_All_Objects_drop_constraint

All Implemented Interfaces:

org.flywaydb.core.api.migration.jdbc.JdbcMigration, org.flywaydb.core.api.migration.MigrationChecksumProvider

public class V5_0_2014_09_25__DS_1582_Metadata_For_All_Objects_drop_constraint
extends Object
implements org.flywaydb.core.api.migration.jdbc.JdbcMigration, org.flywaydb.core.api.migration.MigrationChecksumProvider

This class is in support of the DS-1582 Metadata for All Objects feature. It simply drops the database constraint associated with the "item_id" column of the "metadatavalue" table. This is necessary because to support DS-1582 this column must be renamed to "resource_id".

This class was created because the names of database constraints differs based on the type of database (Postgres vs. Oracle vs. H2). As such, it becomes difficult to write simple SQL which will work for multiple database types (especially since unit tests require H2 and the syntax for H2 is different from either Oracle or Postgres).

NOTE: This migration class is very simple because it is meant to be used in conjuction with the corresponding SQL script: ./etc/migrations/[db-type]/V5.0_2014_09_26__DS-1582_Metadata_For_All_Objects.sql

Also note that this migration is dated as 2014_09_25 so that it will run just PRIOR to the corresponding SQL script listed above.

This class represents a Flyway DB Java Migration http://flywaydb.org/documentation/migration/java.html

Author:

Tim Donohue

Constructor Summary

Constructors

Constructor and Description
V5_0_2014_09_25__DS_1582_Metadata_For_All_Objects_drop_constraint()

Method Summary

Methods

Modifier and Type	Method and Description
Integer	getChecksum() Return the checksum to be associated with this Migration in the Flyway database table (schema_version).
void	migrate(Connection connection) Actually migrate the existing database

Methods inherited from class java.lang.Object

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

Constructor Detail

V5_0_2014_09_25__DS_1582_Metadata_For_All_Objects_drop_constraint

public V5_0_2014_09_25__DS_1582_Metadata_For_All_Objects_drop_constraint()

Method Detail

migrate

public void migrate(Connection connection)
             throws IOException,
                    SQLException

Actually migrate the existing database

Specified by:

migrate in interface org.flywaydb.core.api.migration.jdbc.JdbcMigration

Parameters:

connection -

Throws:

IOException

SQLException

getChecksum

public Integer getChecksum()

Return the checksum to be associated with this Migration in the Flyway database table (schema_version).

Specified by:

getChecksum in interface org.flywaydb.core.api.migration.MigrationChecksumProvider

Returns:

checksum as an Integer