com.amazon.carbonado.repo.jdbc
Interface JDBCConnectionCapability

All Superinterfaces:

Capability

All Known Subinterfaces:

JDBCSupport<S>

public interface JDBCConnectionCapability
extends Capability

Capability to directly access the JDBC connection being used by the current transaction, which is thread-local. If no transaction is in progress, then the connection is in auto-commit mode.

All connections retrieved from this capability must be properly yielded. Do not close the connection directly, as this interferes with the transaction's ability to properly manage it.

It is perfectly okay for other Carbonado calls to be made while the connection is in use. Also, it is okay to request more connections, although they will usually be the same instance. Failing to yield a connection has an undefined behavior.

 JDBCConnectionCapability cap = repo.getCapability(JDBCConnectionCapability.class);
 Transaction txn = repo.enterTransaction();
 try {
     Connection con = cap.getConnection();
     try {
         ...
     } finally {
         cap.yieldConnection(con);
     }
     ...
     txn.commit();
 } finally {
     txn.exit();
 }
 

Author:

Brian S O'Neill

Method Summary

Connection	getConnection() Any connection returned by this method must be closed by calling yieldConnection.
String	getDatabaseProductName() Returns the name of the database product connected to.
boolean	isTransactionForUpdate() Returns true if a transaction is in progress and it is for update.
boolean	isUniqueConstraintError(SQLException e) Examines the SQLSTATE code of the given SQL exception and determines if it is a unique constaint violation.
FetchException	toFetchException(Throwable e) Transforms the given throwable into an appropriate fetch exception.
PersistException	toPersistException(Throwable e) Transforms the given throwable into an appropriate persist exception.
void	yieldConnection(Connection con) Gives up a connection returned from getConnection.

Method Detail

getConnection

Connection getConnection()
                         throws FetchException

Any connection returned by this method must be closed by calling yieldConnection.

Throws:

FetchException

yieldConnection

void yieldConnection(Connection con)
                     throws FetchException

Gives up a connection returned from getConnection. Connection must be yielded in same thread that retrieved it.

Throws:

FetchException

toFetchException

FetchException toFetchException(Throwable e)

Transforms the given throwable into an appropriate fetch exception. If it already is a fetch exception, it is simply casted.

Parameters:

e - required exception to transform

Returns:

FetchException, never null

Since:

1.2

toPersistException

PersistException toPersistException(Throwable e)

Transforms the given throwable into an appropriate persist exception. If it already is a persist exception, it is simply casted.

Parameters:

e - required exception to transform

Returns:

PersistException, never null

Since:

1.2

isUniqueConstraintError

boolean isUniqueConstraintError(SQLException e)

Examines the SQLSTATE code of the given SQL exception and determines if it is a unique constaint violation.

Since:

1.2

isTransactionForUpdate

boolean isTransactionForUpdate()

Returns true if a transaction is in progress and it is for update.

Since:

1.2

getDatabaseProductName

String getDatabaseProductName()

Returns the name of the database product connected to.