org.firebirdsql.gds.ng

## Interface FbDatabase

- All Superinterfaces:
    java.lang.AutoCloseable, ExceptionListenable, FbAttachment
  All Known Subinterfaces:
    FbWireDatabase
  All Known Implementing Classes:
    AbstractFbDatabase, AbstractFbWireDatabase, JnaDatabase, V10Database, V11Database, V12Database, V13Database

      public interface FbDatabase
      extends FbAttachment

  Connection handle to a database.

  All methods defined in this interface are required to notify all `SQLException` thrown from the methods defined in this interface, and those exceptions notified by all `ExceptionListenable` implementations created from them.

  Since:
    3.0
  Author:
    Mark Rotteveel

- - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `addDatabaseListener(DatabaseListener listener)` Adds a `DatabaseListener` instance to this database.
    `void` | `addWeakDatabaseListener(DatabaseListener listener)` Adds a `DatabaseListener` instance to this database using a weak reference.
    `void` | `cancelEvent(EventHandle eventHandle)` Cancels a registered event.
    `void` | `cancelOperation(int kind)` Cancels the current operation.
    `void` | `countEvents(EventHandle eventHandle)` Counts the events occurred.
    `FbBlob` | `createBlobForInput(FbTransaction transaction, BlobParameterBuffer blobParameterBuffer, long blobId)` Creates a blob for read access to an existing blob on the server.
    `FbBlob` | `createBlobForOutput(FbTransaction transaction, BlobParameterBuffer blobParameterBuffer)` Creates a blob for write access to a new blob on the server.
    `BlobParameterBuffer` | `createBlobParameterBuffer()` Creates a blob parameter buffer that is usable with `createBlobForInput(FbTransaction, org.firebirdsql.gds.BlobParameterBuffer, long)` and `createBlobForOutput(FbTransaction, org.firebirdsql.gds.BlobParameterBuffer)` of this instance.
    `void` | `createDatabase()` Creates a new database, connection remains attached to database.
    `EventHandle` | `createEventHandle(java.lang.String eventName, EventHandler eventHandler)` Creates an event handle for this database type.
    `FbStatement` | `createStatement(FbTransaction transaction)` Creates a statement associated with a transaction
    `TransactionParameterBuffer` | `createTransactionParameterBuffer()` Creates a transaction parameter buffer that is usable with `startTransaction(org.firebirdsql.gds.TransactionParameterBuffer)`.
    `void` | `dropDatabase()` Drops (and deletes) the currently attached database.
    `RowDescriptor` | `emptyRowDescriptor()`
    `void` | `executeImmediate(java.lang.String statementText, FbTransaction transaction)` Performs an execute immediate of a statement.
    `short` | `getConnectionDialect()`
    `IConnectionProperties` | `getConnectionProperties()`
    `short` | `getDatabaseDialect()`
    `byte[]` | `getDatabaseInfo(byte[] requestItems, int maxBufferLength)` Performs a database info request.
    `<T> T` | `getDatabaseInfo(byte[] requestItems, int bufferLength, InfoProcessor<T> infoProcessor)` Request database info.
    `int` | `getHandle()`
    `int` | `getOdsMajor()`
    `int` | `getOdsMinor()`
    `void` | `queueEvent(EventHandle eventHandle)` Queues a wait for an event.
    `FbTransaction` | `reconnectTransaction(long transactionId)` Reconnects a prepared transaction.
    `void` | `removeDatabaseListener(DatabaseListener listener)` Removes a `DatabaseListener` instance from this database.
    `FbTransaction` | `startTransaction(TransactionParameterBuffer tpb)` Creates and starts a transaction.

    - ### Methods inherited from interface org.firebirdsql.gds.ng.FbAttachment

      `attach, close, getDatatypeCoder, getEncoding, getEncodingFactory, getServerVersion, getSynchronizationObject, isAttached`

    - ### Methods inherited from interface org.firebirdsql.gds.ng.listeners.ExceptionListenable

      `addExceptionListener, removeExceptionListener`

- - ### Method Detail

    - #### createDatabase

          void createDatabase()
                              throws java.sql.SQLException

      Creates a new database, connection remains attached to database.
      Throws:
        `java.sql.SQLException`

    - #### dropDatabase

          void dropDatabase()
                            throws java.sql.SQLException

      Drops (and deletes) the currently attached database.
      Throws:
        `java.sql.SQLException`

    - #### cancelOperation

          void cancelOperation(int kind)
                               throws java.sql.SQLException

      Cancels the current operation.

      The cancellation types are:

      `ISCConstants.fb_cancel_disable`
        disables execution of fb_cancel_raise requests for the specified attachment. It can be useful when your0 program is executing critical operations, such as cleanup, for example.
      `ISCConstants.fb_cancel_enable`
        re-enables delivery of a cancel execution that was previously disabled. The 'cancel' state is effective by default, being initialized when the attachment is created.
      `ISCConstants.fb_cancel_raise`
        cancels any activity related to the database handle. The effect will be that, as soon as possible, the engine will try to stop the running request and return an exception to the caller
      `ISCConstants.fb_cancel_abort`
        forcibly close client side of connection. Useful if you need to close a connection urgently. All active transactions will be rolled back by the server. 'Success' is always returned to the application. Use with care!
      Parameters:
        `kind` - Cancellation type
      Throws:
        `java.sql.SQLException` - For errors cancelling, or if the cancel operation is not supported.

    - #### startTransaction

          FbTransaction startTransaction(TransactionParameterBuffer tpb)
                                         throws java.sql.SQLException

      Creates and starts a transaction.
      Parameters:
        `tpb` - TransactionParameterBuffer with the required transaction options
      Returns:
        FbTransaction
      Throws:
        `java.sql.SQLException`

    - #### reconnectTransaction

          FbTransaction reconnectTransaction(long transactionId)
                                             throws java.sql.SQLException

      Reconnects a prepared transaction.

      Reconnecting transactions is only allowed for transactions in limbo (prepared, but not committed or rolled back).

      Parameters:
        `transactionId` - The id of the transaction to reconnect.
      Returns:
        FbTransaction
      Throws:
        `java.sql.SQLException` - For errors reconnecting the transaction

    - #### createStatement

          FbStatement createStatement(FbTransaction transaction)
                                      throws java.sql.SQLException

      Creates a statement associated with a transaction
      Parameters:
        `transaction` - FbTransaction to associate with this statement (can be `null`).
      Returns:
        FbStatement
      Throws:
        `java.sql.SQLException`

    - #### createBlobForOutput

          FbBlob createBlobForOutput(FbTransaction transaction,
                                   BlobParameterBuffer blobParameterBuffer)

      Creates a blob for write access to a new blob on the server.

      The blob is initially closed.

      Parameters:
        `transaction` - Transaction associated with the blob.
        `blobParameterBuffer` - Blob Parameter Buffer
      Returns:
        Instance of `FbBlob`

    - #### createBlobForInput

          FbBlob createBlobForInput(FbTransaction transaction,
                                  BlobParameterBuffer blobParameterBuffer,
                                  long blobId)

      Creates a blob for read access to an existing blob on the server.

      The blob is initially closed.

      Parameters:
        `transaction` - Transaction associated with the blob.
        `blobParameterBuffer` - Blob Parameter Buffer
        `blobId` - Handle id of the blob
      Returns:
        Instance of `FbBlob`

    - #### createBlobParameterBuffer

          BlobParameterBuffer createBlobParameterBuffer()

      Creates a blob parameter buffer that is usable with `createBlobForInput(FbTransaction, org.firebirdsql.gds.BlobParameterBuffer, long)` and `createBlobForOutput(FbTransaction, org.firebirdsql.gds.BlobParameterBuffer)` of this instance.
      Returns:
        A blob parameter buffer.

    - #### createTransactionParameterBuffer

          TransactionParameterBuffer createTransactionParameterBuffer()

      Creates a transaction parameter buffer that is usable with `startTransaction(org.firebirdsql.gds.TransactionParameterBuffer)`.
      Returns:
        A transaction parameter buffer

    - #### getDatabaseInfo

          <T> T getDatabaseInfo(byte[] requestItems,
                              int bufferLength,
                              InfoProcessor<T> infoProcessor)
                            throws java.sql.SQLException

      Request database info.
      Parameters:
        `requestItems` - Array of info items to request
        `bufferLength` - Response buffer length to use
        `infoProcessor` - Implementation of `InfoProcessor` to transform the info response
      Returns:
        Transformed info response of type T
      Throws:
        `java.sql.SQLException` - For errors retrieving or transforming the response.

    - #### getDatabaseInfo

          byte[] getDatabaseInfo(byte[] requestItems,
                               int maxBufferLength)
                                 throws java.sql.SQLException

      Performs a database info request.
      Parameters:
        `requestItems` - Information items to request
        `maxBufferLength` - Maximum response buffer length to use
      Returns:
        The response buffer (note: length is the actual length of the response, not `maxBufferLength`
      Throws:
        `java.sql.SQLException` - For errors retrieving the information.

    - #### executeImmediate

          void executeImmediate(java.lang.String statementText,
                              FbTransaction transaction)
                                throws java.sql.SQLException

      Performs an execute immediate of a statement.

      A call to this method is the equivalent of a `isc_dsql_execute_immediate()` without parameters.

      Parameters:
        `statementText` - Statement text
        `transaction` - Transaction (`null` only allowed if database is not attached!)
      Throws:
        `java.sql.SQLException` - For errors executing the statement, or if `transaction` is `null` when the database is attached or not `null` when the database is not attached

    - #### getDatabaseDialect

          short getDatabaseDialect()

      Returns:
        The database dialect

    - #### getConnectionDialect

          short getConnectionDialect()

      Returns:
        The client connection dialect

    - #### getHandle

          int getHandle()

      Specified by:
        `getHandle` in interface `FbAttachment`
      Returns:
        The database handle value

    - #### getOdsMajor

          int getOdsMajor()

      Returns:
        ODS major version

    - #### getOdsMinor

          int getOdsMinor()

      Returns:
        ODS minor version

    - #### addDatabaseListener

          void addDatabaseListener(DatabaseListener listener)

      Adds a `DatabaseListener` instance to this database.
      Parameters:
        `listener` - Database listener

    - #### addWeakDatabaseListener

          void addWeakDatabaseListener(DatabaseListener listener)

      Adds a `DatabaseListener` instance to this database using a weak reference.

      If the listener is already strongly referenced, this call will be ignored

      Parameters:
        `listener` - Database listener

    - #### removeDatabaseListener

          void removeDatabaseListener(DatabaseListener listener)

      Removes a `DatabaseListener` instance from this database.
      Parameters:
        `listener` - Database Listener

    - #### createEventHandle

          EventHandle createEventHandle(java.lang.String eventName,
                                      EventHandler eventHandler)
                                        throws java.sql.SQLException

      Creates an event handle for this database type.

      The returned event handle can be used with `queueEvent(org.firebirdsql.gds.EventHandle)`.

      Parameters:
        `eventName` - Name of the event
        `eventHandler` - The event handler to call when the event occurred
      Returns:
        A suitable event handle instance
      Throws:
        `java.sql.SQLException` - For errors creating the event handle

    - #### countEvents

          void countEvents(EventHandle eventHandle)
                           throws java.sql.SQLException

      Counts the events occurred.
      Parameters:
        `eventHandle` - The event handle
      Throws:
        `java.sql.SQLException` - When the count can not be done (as - for example - the event handle is of the wrong type)

    - #### queueEvent

          void queueEvent(EventHandle eventHandle)
                          throws java.sql.SQLException

      Queues a wait for an event.
      Parameters:
        `eventHandle` - The event handle (created using `createEventHandle(String, EventHandler)` of this instance).
      Throws:
        `java.sql.SQLException` - For errors establishing the asynchronous channel, or for queuing the event.

    - #### cancelEvent

          void cancelEvent(EventHandle eventHandle)
                           throws java.sql.SQLException

      Cancels a registered event.

      After cancellation, the event handle should be considered unusable. Before queueing a new event, an new handle needs to be created.

      Parameters:
        `eventHandle` - The event handle to cancel
      Throws:
        `java.sql.SQLException` - For errors cancelling the event

    - #### getConnectionProperties

          IConnectionProperties getConnectionProperties()

      Returns:
        An immutable copy of the connection properties of this database

    - #### emptyRowDescriptor

          RowDescriptor emptyRowDescriptor()

      Returns:
        A potentially cached empty row descriptor for this database.

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