/*
* JBoss, Home of Professional Open Source
* Copyright 2006, Red Hat Middleware LLC, and individual contributors
* as indicated by the @author tags.
* See the copyright.txt in the distribution for a
* full listing of individual contributors.
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU Lesser General Public License, v. 2.1.
* This program is distributed in the hope that it will be useful, but WITHOUT A
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
* PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General Public License,
* v.2.1 along with this distribution; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*
* (C) 2005-2009,
* @author JBoss Inc.
*/
/*
* Copyright (C) 1998, 1999, 2000, 2001,
*
* Arjuna Solutions Limited,
* Newcastle upon Tyne,
* Tyne and Wear,
* UK.
*
* $Id: ConnectionImple.java 2342 2006-03-30 13:06:17Z $
*/
package com.arjuna.ats.internal.jdbc;
import java.sql.Array;
import java.sql.Blob;
import java.sql.CallableStatement;
import java.sql.Clob;
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.NClob;
import java.sql.PreparedStatement;
import java.sql.SQLClientInfoException;
import java.sql.SQLException;
import java.sql.SQLWarning;
import java.sql.SQLXML;
import java.sql.Savepoint;
import java.sql.Statement;
import java.sql.Struct;
import java.util.Map;
import java.util.Properties;
import java.util.concurrent.Executor;
import javax.sql.XAConnection;
import javax.sql.XADataSource;
import javax.transaction.RollbackException;
import javax.transaction.Status;
import javax.transaction.SystemException;
import javax.transaction.xa.XAResource;
import com.arjuna.ats.internal.jdbc.drivers.modifiers.ConnectionModifier;
import com.arjuna.ats.internal.jdbc.drivers.modifiers.ModifierFactory;
import com.arjuna.ats.jdbc.TransactionalDriver;
import com.arjuna.ats.jdbc.common.jdbcPropertyManager;
import com.arjuna.ats.jdbc.logging.jdbcLogger;
import com.arjuna.ats.jta.xa.RecoverableXAConnection;
import com.arjuna.ats.jta.xa.XAModifier;
/**
* A transactional JDBC connection. This wraps the real connection and
* registers it with the transaction at appropriate times to ensure that all
* worked performed by it may be committed or rolled back.
*
* Once a connection is used within a transaction, that instance is bound to
* that transaction for the duration. It can be used by any number of threads,
* as long as they all have the same notion of the "current" transaction. When
* the transaction terminates, the connection is freed for use in another
* transaction.
*
* Applications must not use this class directly.
*
* @author Mark Little (mark@arjuna.com)
* @version $Id: ConnectionImple.java 2342 2006-03-30 13:06:17Z $
* @since JTS 2.0.
*/
public class ConnectionImple implements Connection
{
public ConnectionImple(String dbName, Properties info) throws SQLException
{
if (jdbcLogger.logger.isTraceEnabled()) {
jdbcLogger.logger.trace("ConnectionImple.ConnectionImple ( " + dbName + " )");
}
String user = null;
String passwd = null;
String dynamic = null;
Object xaDataSource = null;
if (info != null)
{
user = info.getProperty(TransactionalDriver.userName, "");
passwd = info.getProperty(TransactionalDriver.password, "");
dynamic = info.getProperty(TransactionalDriver.dynamicClass);
xaDataSource = info.get(TransactionalDriver.XADataSource);
}
if (xaDataSource != null)
{
_transactionalDriverXAConnectionConnection = new ProvidedXADataSourceConnection(dbName, user,
passwd, (XADataSource) xaDataSource, this);
}
else if ((dynamic == null) || (dynamic.equals("")))
{
_transactionalDriverXAConnectionConnection = new IndirectRecoverableConnection(dbName,
user, passwd, this);
}
else
{
_transactionalDriverXAConnectionConnection = new DirectRecoverableConnection(dbName, user,
passwd, dynamic, this);
}
/*
* Is there any "modifier" we are required to work with?
*/
_theModifier = null;
_theConnection = null;
}
public ConnectionImple(String dbName, String user, String passwd)
throws SQLException
{
this(dbName, user, passwd, null, null);
}
public ConnectionImple(String dbName, String user, String passwd,
String dynamic, Object xaDataSource) throws SQLException
{
if (jdbcLogger.logger.isTraceEnabled()) {
jdbcLogger.logger.trace("ConnectionImple.ConnectionImple ( " + dbName + ", " + user
+ ", " + passwd + ", " + dynamic + " )");
}
if (xaDataSource != null)
{
_transactionalDriverXAConnectionConnection = new ProvidedXADataSourceConnection(dbName, user,
passwd, (XADataSource) xaDataSource, this);
}
else if ((dynamic == null) || (dynamic.equals("")))
{
_transactionalDriverXAConnectionConnection = new IndirectRecoverableConnection(dbName,
user, passwd, this);
}
else
{
_transactionalDriverXAConnectionConnection = new DirectRecoverableConnection(dbName, user,
passwd, dynamic, this);
}
/*
* Any "modifier" required to work with?
*/
_theModifier = null;
_theConnection = null;
}
public Statement createStatement() throws SQLException
{
checkTransaction();
registerDatabase();
return getConnection().createStatement();
}
public Statement createStatement(int rs, int rc) throws SQLException
{
checkTransaction();
registerDatabase();
return getConnection().createStatement(rs, rc);
}
public PreparedStatement prepareStatement(String sql) throws SQLException
{
checkTransaction();
registerDatabase();
return getConnection().prepareStatement(sql);
}
public PreparedStatement prepareStatement(String sql, int rs, int rc)
throws SQLException
{
checkTransaction();
registerDatabase();
return getConnection().prepareStatement(sql, rs, rc);
}
public CallableStatement prepareCall(String sql) throws SQLException
{
checkTransaction();
registerDatabase();
return getConnection().prepareCall(sql);
}
public CallableStatement prepareCall(String sql, int rs, int rc)
throws SQLException
{
checkTransaction();
registerDatabase();
return getConnection().prepareCall(sql, rs, rc);
}
public String nativeSQL(String sql) throws SQLException
{
checkTransaction();
registerDatabase();
return getConnection().nativeSQL(sql);
}
public Map getTypeMap() throws SQLException
{
return getConnection().getTypeMap();
}
/*
public void setTypeMap(Map map) throws SQLException
{
getConnection().setTypeMap(map);
}
*/
/**
* Not allowed if within a transaction.
*/
public void setAutoCommit(boolean autoCommit) throws SQLException
{
if (transactionRunning())
{
if (autoCommit)
throw new SQLException(jdbcLogger.i18NLogger.get_autocommit());
}
else
{
getConnection().setAutoCommit(autoCommit);
}
}
public boolean getAutoCommit() throws SQLException
{
return getConnection().getAutoCommit();
}
public void commit() throws SQLException
{
/*
* If there is a transaction running, then it cannot be terminated via
* the driver - the user must go through current.
*/
if (transactionRunning())
{
throw new SQLException(jdbcLogger.i18NLogger.get_commiterror());
}
else
getConnection().commit();
}
public void rollback() throws SQLException
{
if (transactionRunning())
{
throw new SQLException(jdbcLogger.i18NLogger.get_aborterror());
}
else
getConnection().rollback();
}
/*
* This needs to be reworked in light of experience and requirements.
*/
public void close() throws SQLException
{
boolean delayClose = false;
try
{
/*
* Delist resource if within a transaction.
*/
javax.transaction.TransactionManager tm = com.arjuna.ats.jta.TransactionManager
.transactionManager();
javax.transaction.Transaction tx = tm.getTransaction();
/*
* Don't delist if transaction not running. Rely on exception for
* this. Also only delist if the transaction is the one the
* connection is enlisted with!
*/
if (tx != null)
{
if (_transactionalDriverXAConnectionConnection.validTransaction(tx))
{
XAResource xares = _transactionalDriverXAConnectionConnection.getResource();
if ((tx.getStatus() == Status.STATUS_ACTIVE && !tx.delistResource(xares, XAResource.TMSUCCESS)) ||
(tx.getStatus() == Status.STATUS_MARKED_ROLLBACK && !tx.delistResource(xares, XAResource.TMFAIL)))
throw new SQLException(
jdbcLogger.i18NLogger.get_delisterror());
if (tx.getStatus() == Status.STATUS_ACTIVE) {
getModifier();
if (_theModifier == null) {
jdbcLogger.i18NLogger.info_closingconnectionnull(_theConnection.toString());
// no indication about connections, so assume close immediately
/*
* Don't return just yet. Drop through bottom of these clauses and
* close _theConnection and _recoveryConnection.
*
* delayClose is false at this point.
*
* JBTM-789.
*/
} else {
if (((ConnectionModifier) _theModifier).supportsMultipleConnections()) {
/*
* We can't close the connection until the transaction has
* terminated, so register a Synchronization here.
*/
jdbcLogger.i18NLogger.debug_closingconnection(_theConnection.toString());
delayClose = true;
}
}
if (delayClose)
{
tx.registerSynchronization(new ConnectionSynchronization(this));
}
}
}
else
throw new SQLException(jdbcLogger.i18NLogger.get_closeerrorinvalidtx(tx.toString()));
}
}
catch (IllegalStateException ex)
{
// transaction not running, so ignore.
}
catch (SQLException sqle)
{
throw sqle;
}
catch (Exception e1)
{
SQLException sqlException = new SQLException(jdbcLogger.i18NLogger.get_closeerror());
sqlException.initCause(e1);
throw sqlException;
} finally {
if (!delayClose) {
closeImpl();
}
}
}
void closeImpl() throws SQLException {
try {
ConnectionManager.remove(this);
if (_theConnection != null && !_theConnection.isClosed()) {
_theConnection.close();
}
if (_transactionalDriverXAConnectionConnection != null) {
_transactionalDriverXAConnectionConnection.closeCloseCurrentConnection();
}
} finally {
_theConnection = null;
_transactionalDriverXAConnectionConnection = null;
}
}
public boolean isClosed() throws SQLException
{
/*
* A connection may appear closed to a thread if another thread has
* bound it to a different transaction.
*/
if (_transactionalDriverXAConnectionConnection == null)
return true; // closeImpl was explicitly called
else if (_theConnection == null)
return false; // not opened yet. // TODO why don't we return true here
else
return _theConnection.isClosed();
}
public DatabaseMetaData getMetaData() throws SQLException
{
return getConnection().getMetaData();
}
/**
* Can only set readonly before we use the connection in a given
* transaction!
*/
public void setReadOnly(boolean ro) throws SQLException
{
if (!_transactionalDriverXAConnectionConnection.inuse())
{
getConnection().setReadOnly(ro);
}
else
throw new SQLException(jdbcLogger.i18NLogger.get_setreadonly());
}
public boolean isReadOnly() throws SQLException
{
return getConnection().isReadOnly();
}
public void setCatalog(String cat) throws SQLException
{
checkTransaction();
registerDatabase();
getConnection().setCatalog(cat);
}
public String getCatalog() throws SQLException
{
checkTransaction();
registerDatabase();
return getConnection().getCatalog();
}
public void setTransactionIsolation(int iso) throws SQLException
{
checkTransaction();
/*
* if (iso != Connection.TRANSACTION_SERIALIZABLE) throw new
* SQLException(jdbcLogger.loggerI18N.getString.getString("com.arjuna.ats.internal.jdbc.stateerror")+"Connection.TRANSACTION_SERIALIZABLE");
*/
getConnection().setTransactionIsolation(iso);
}
public int getTransactionIsolation() throws SQLException
{
return getConnection().getTransactionIsolation();
}
public SQLWarning getWarnings() throws SQLException
{
return getConnection().getWarnings();
}
public void clearWarnings() throws SQLException
{
getConnection().clearWarnings();
}
/**
* @return the Arjuna specific recovery connection information. This should
* not be used by anything other than Arjuna.
*/
public final RecoverableXAConnection recoveryConnection()
{
if (_transactionalDriverXAConnectionConnection instanceof RecoverableXAConnection) {
return (RecoverableXAConnection) _transactionalDriverXAConnectionConnection;
} else {
return null;
}
}
/*
* ******************************************************************* *
* JDBC 3.0 section
*/
public void setTypeMap(Map<String, Class<?>> map) throws SQLException
{
getConnection().setTypeMap(map);
}
public void setHoldability(int holdability) throws SQLException
{
checkTransaction();
registerDatabase();
getConnection().setHoldability(holdability);
}
public int getHoldability() throws SQLException
{
return getConnection().getHoldability();
}
public Savepoint setSavepoint() throws SQLException
{
if (transactionRunning())
{
throw new SQLException(jdbcLogger.i18NLogger.get_setsavepointerror());
}
else
{
return getConnection().setSavepoint();
}
}
public Savepoint setSavepoint(String name) throws SQLException
{
if (transactionRunning())
{
throw new SQLException(jdbcLogger.i18NLogger.get_setsavepointerror());
}
else
{
return getConnection().setSavepoint(name);
}
}
// The JDBC 3.0 spec (section 12.4) prohibits calling setSavepoint indide an XA tx.
// It does not explicitly disallow calling rollback(savepoint) or releaseSavepoint(savepoint)
// but allowing them does not make a whole lot of sense, so we don't:
public void rollback(Savepoint savepoint) throws SQLException
{
if (transactionRunning())
{
throw new SQLException(jdbcLogger.i18NLogger.get_rollbacksavepointerror());
}
else
{
getConnection().rollback(savepoint);
}
}
public void releaseSavepoint(Savepoint savepoint) throws SQLException
{
if (transactionRunning())
{
throw new SQLException(jdbcLogger.i18NLogger.get_releasesavepointerror());
}
else
{
getConnection().releaseSavepoint(savepoint);
}
}
public Statement createStatement(int resultSetType, int resultSetConcurrency,
int resultSetHoldability) throws SQLException
{
checkTransaction();
registerDatabase();
return getConnection().createStatement(resultSetType, resultSetConcurrency, resultSetHoldability);
}
public PreparedStatement prepareStatement(String sql, int resultSetType,
int resultSetConcurrency, int resultSetHoldability) throws SQLException
{
checkTransaction();
registerDatabase();
return getConnection().prepareStatement(sql, resultSetType, resultSetConcurrency, resultSetHoldability);
}
public CallableStatement prepareCall(String sql, int resultSetType,
int resultSetConcurrency, int resultSetHoldability) throws SQLException
{
checkTransaction();
registerDatabase();
return getConnection().prepareCall(sql, resultSetType, resultSetConcurrency, resultSetHoldability);
}
public PreparedStatement prepareStatement(String sql, int autoGeneratedKeys)
throws SQLException
{
checkTransaction();
registerDatabase();
return getConnection().prepareStatement(sql, autoGeneratedKeys);
}
public PreparedStatement prepareStatement(String sql, int columnIndexes[])
throws SQLException
{
checkTransaction();
registerDatabase();
return getConnection().prepareStatement(sql, columnIndexes);
}
public PreparedStatement prepareStatement(String sql, String columnNames[])
throws SQLException
{
checkTransaction();
registerDatabase();
return getConnection().prepareStatement(sql, columnNames);
}
/*
* end of the JDBC 3.0 section
* *******************************************************************
*/
/*
* ******************************************************************* *
* JDBC 4.0 method section.
*/
public Clob createClob() throws SQLException
{
checkTransaction();
registerDatabase();
return getConnection().createClob();
}
public Blob createBlob() throws SQLException
{
checkTransaction();
registerDatabase();
return getConnection().createBlob();
}
public NClob createNClob() throws SQLException
{
checkTransaction();
registerDatabase();
return getConnection().createNClob();
}
public SQLXML createSQLXML() throws SQLException
{
checkTransaction();
registerDatabase();
return getConnection().createSQLXML();
}
public boolean isValid(int timeout) throws SQLException
{
checkTransaction();
registerDatabase();
return getConnection().isValid(timeout);
}
public String getClientInfo(String name) throws SQLException
{
return getConnection().getClientInfo(name);
}
public Properties getClientInfo() throws SQLException
{
return getConnection().getClientInfo();
}
public void setClientInfo(String name, String value) throws SQLClientInfoException
{
try
{
getConnection().setClientInfo(name, value);
}
catch(SQLException e)
{
throw new SQLClientInfoException("setClientInfo : getConnection failed", null, e);
}
}
public void setClientInfo(Properties properties) throws SQLClientInfoException
{
try
{
getConnection().setClientInfo(properties);
}
catch(SQLException e)
{
throw new SQLClientInfoException("setClientInfo : getConnection failed", null, e);
}
}
public Array createArrayOf(String typeName, Object[] elements) throws SQLException
{
checkTransaction();
registerDatabase();
return getConnection().createArrayOf(typeName, elements);
}
public Struct createStruct(String typeName, Object[] attributes) throws SQLException
{
checkTransaction();
registerDatabase();
return getConnection().createStruct(typeName, attributes);
}
public <T> T unwrap(Class<T> iface) throws SQLException
{
if (iface != null) {
if (iface.isInstance(this)) {
return (T) this;
} else {
Connection conn = getConnection();
if (conn != null) {
if (iface.isInstance(conn)) {
return (T) conn;
} else if(conn.isWrapperFor(iface)) {
return conn.unwrap(iface);
}
}
}
}
return null;
}
public boolean isWrapperFor(Class<?> iface) throws SQLException
{
if (iface != null) {
if (iface.isInstance(this)) {
return true;
} else {
Connection conn = getConnection();
if (conn != null) {
if (iface.isInstance(conn)) {
return true;
} else {
return conn.isWrapperFor(iface);
}
}
}
}
return false;
}
/*
* end of the JDBC 4.0 section
* *******************************************************************
*/
/*
* ******************************************************************* *
* Java 7 method section.
*/
//@Override
public void setSchema(String schema) throws SQLException
{
throw new SQLException();
}
//@Override
public String getSchema() throws SQLException
{
throw new SQLException();
}
//@Override
public void abort(Executor executor) throws SQLException
{
throw new SQLException();
}
//@Override
public void setNetworkTimeout(Executor executor, int milliseconds) throws SQLException
{
throw new SQLException();
}
//@Override
public int getNetworkTimeout() throws SQLException
{
throw new SQLException();
}
/*
* end of the Java 7 section
* *******************************************************************
*/
/**
* @return the XAResource associated with the current XAConnection.
*/
protected final XAResource getXAResource()
{
try
{
return _transactionalDriverXAConnectionConnection.getResource();
}
catch (Exception e)
{
return null;
}
}
/**
* Remove this connection so that we have to get another one when asked.
* Some drivers allow connections to be reused once any transactions have
* finished with them.
*/
final void reset()
{
try
{
closeImpl();
}
catch (Exception ex)
{
}
}
final java.sql.Connection getConnection() throws SQLException
{
if (_theConnection != null && !_theConnection.isClosed())
return _theConnection;
XAConnection xaConn = _transactionalDriverXAConnectionConnection.getConnection();
if (xaConn != null)
{
_theConnection = xaConn.getConnection();
try
{
getModifier();
if (_theModifier != null)
{
((ConnectionModifier) _theModifier).setIsolationLevel(
_theConnection, _currentIsolationLevel);
}
}
catch (SQLException ex)
{
throw ex;
}
catch (Exception e)
{
jdbcLogger.i18NLogger.warn_isolationlevelfailset("ConnectionImple.getConnection", e);
SQLException sqlException = new SQLException(jdbcLogger.i18NLogger.get_conniniterror());
sqlException.initCause(e);
throw sqlException;
}
return _theConnection;
}
else
return null;
}
final ConnectionControl connectionControl()
{
return (ConnectionControl) _transactionalDriverXAConnectionConnection;
}
protected final boolean transactionRunning() throws SQLException
{
try
{
if (com.arjuna.ats.jta.TransactionManager.transactionManager()
.getTransaction() != null)
{
return true;
}
else
{
return false;
}
}
catch (Exception e)
{
SQLException sqlException = new SQLException(e.toString());
sqlException.initCause(e);
throw sqlException;
}
}
/**
* Whenever a JDBC call is invoked on us we get an XAResource and try to
* register it with the transaction. If the same thread causes this to
* happen many times within the same transaction then we will currently
* attempt to get and register many redundant XAResources for it. The JTA
* implementation will detect this and ignore all but the first for each
* thread. However, a further optimisation would be to trap such calls here
* and not do a registration at all. This would require the connection
* object to be informed whenever a transaction completes so that it could
* flush its cache of XAResources though.
*/
protected final synchronized void registerDatabase() throws SQLException
{
if (jdbcLogger.logger.isTraceEnabled()) {
jdbcLogger.logger.trace("ConnectionImple.registerDatabase ()");
}
Connection theConnection = getConnection();
if (theConnection != null)
{
XAResource xares = null;
try
{
javax.transaction.TransactionManager tm = com.arjuna.ats.jta.TransactionManager
.transactionManager();
javax.transaction.Transaction tx = tm.getTransaction();
if (tx == null)
return;
/*
* Already enlisted with this transaction?
*/
if (!_transactionalDriverXAConnectionConnection.setTransaction(tx))
throw new SQLException( jdbcLogger.i18NLogger.get_alreadyassociated() );
Object[] params;
if (_theModifier != null)
params = new Object[2];
else
params = new Object[1];
params[com.arjuna.ats.jta.transaction.Transaction.XACONNECTION] = _transactionalDriverXAConnectionConnection;
if (_theModifier != null)
params[com.arjuna.ats.jta.transaction.Transaction.XAMODIFIER] = (XAModifier) _theModifier;
/*
* Use our extended version of enlistResource.
*/
xares = _transactionalDriverXAConnectionConnection.getResource();
if (!((com.arjuna.ats.jta.transaction.Transaction) tx)
.enlistResource(xares, params))
{
/*
* Failed to enlist, so mark transaction as rollback only.
*/
try
{
tx.setRollbackOnly();
}
catch (Exception e)
{
jdbcLogger.i18NLogger.warn_rollbackerror("ConnectionImple.registerDatabase");
SQLException sqlException = new SQLException(e.toString());
sqlException.initCause(e);
throw sqlException;
}
throw new SQLException(
"ConnectionImple.registerDatabase - "
+ jdbcLogger.i18NLogger.get_enlistfailed());
}
params = null;
xares = null;
tx = null;
tm = null;
}
catch (RollbackException e1)
{
SQLException sqlException = new SQLException("ConnectionImple.registerDatabase - " + e1);
sqlException.initCause(e1);
throw sqlException;
}
catch (SystemException e2)
{
SQLException sqlException = new SQLException("ConnectionImple.registerDatabase - "+ e2);
sqlException.initCause(e2);
throw sqlException;
}
catch (SQLException e3)
{
throw e3;
}
catch (Exception e4)
{
SQLException sqlException = new SQLException(e4.toString());
sqlException.initCause(e4);
throw sqlException;
}
}
}
protected final void checkTransaction() throws SQLException
{
if (jdbcLogger.logger.isTraceEnabled()) {
jdbcLogger.logger.trace("ConnectionImple.checkTransaction ()");
}
try
{
javax.transaction.TransactionManager tm = com.arjuna.ats.jta.TransactionManager
.transactionManager();
javax.transaction.Transaction tx = tm.getTransaction();
if (tx == null)
return;
if (tx.getStatus() != Status.STATUS_ACTIVE)
throw new SQLException(jdbcLogger.i18NLogger.get_inactivetransaction());
/*
* Now check that we are not already associated with a transaction.
*/
if (!_transactionalDriverXAConnectionConnection.validTransaction(tx))
throw new SQLException(
jdbcLogger.i18NLogger.get_alreadyassociatedcheck());
}
catch (SQLException ex)
{
throw ex;
}
catch (Exception e3)
{
SQLException sqlException = new SQLException(jdbcLogger.i18NLogger.get_infoerror());
sqlException.initCause(e3);
throw sqlException;
}
}
private final void getModifier()
{
if (_theModifier == null)
{
try
{
DatabaseMetaData md = _theConnection.getMetaData();
String name = md.getDriverName();
int major = md.getDriverMajorVersion();
int minor = md.getDriverMinorVersion();
_theModifier = ModifierFactory.getModifier(name, major, minor);
((ConnectionControl) _transactionalDriverXAConnectionConnection)
.setModifier((ConnectionModifier) _theModifier);
}
catch (Exception ex)
{
jdbcLogger.i18NLogger.warn_getmoderror(ex);
}
}
}
private TransactionalDriverXAConnection _transactionalDriverXAConnectionConnection;
private java.lang.Object _theModifier;
private Connection _theConnection;
private static final int defaultIsolationLevel = Connection.TRANSACTION_SERIALIZABLE;
private static final int _currentIsolationLevel = jdbcPropertyManager.getJDBCEnvironmentBean().getIsolationLevel();
}