Package de.hshannover.dqgui.execution.database.api

Database Abstraction Layer API

Interface Summary

Interface	Description
ConnectionHandle<T>	A handle for a connection that guarantees the connection is always open.
RelationalRepositorySupport	This class helps with different SQL dialects for relational databases by supplying implementation dependent queries. RelationalRepositorySupport returns named prepared statements. That means instead of writing SELECT * FROM t WHERE name = ? you would write SELECT * FROM t WHERE name = :name RelationalRepositorySupport is used by Engines using the JdbcRepository implementation. Table, column and parameter names are hard coded and must be used in your implementation. It is recommended to use this in combination with the subclass YamlConfigurableRelationalRepositorySupport. A NoSQL solution would not need to implement this but instead just provide a Repository and DSLService implementation.
Repository<T>	Base type of all database backed repositories.

Class Summary

Class	Description
DatabaseConnection	Abstracts a database connection.
DatabaseCredential	Represents a common set of credential fields (username, password, database).
DatabaseEngine	All database engines must extend this base class. To have the engine loaded they must be in the package de.hshannover.dqgui.support.database.api.
DatabaseFetcher	Database Fetcher Interface.
DatabaseSocket	Store a socket (host + port).
DatabaseTests	Some pre-defined database tests and the test result API.
DatabaseTests.DatabaseTestResult	Database tests must return this.
EngineIdentifier	An EngineIdentifier uniquely identifies an engine to the EngineManager. The identifier will always be converted to an upper case string. It can be queries as a lower case string tho as it will be converted automatically.
EngineLanguage	An engine language uniquely identifies the language the database system uses.
EngineManager	Handles database engine registration.
RelationalRepositorySupport.KeyHandle	A key handle allows to abstract key creation. Some databases allow auto incrementing keys with the query, others require you to supply your own key by querying a series first. The KeyHandle allows to abstract this away so the higher layer always gets the correct primary key.
Repository.ValidationReport	Reports if the repository fulfills the required schema.
YamlConfigurableRelationalRepositorySupport	A RelationalRepositorySupport that is configurable through YAML and results thus in less boiler plate.

Enum Summary

Enum	Description
DatabaseSocket.HostFormat	Possible host formats
RelationalRepositorySupport.KeyType