/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2008-2011, Red Hat Inc. or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors. All third-party contributions are
* distributed under license by Red Hat Inc.
*
* 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, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY 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
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*/
package org.hibernate.id.enhanced;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Types;
import org.jboss.logging.Logger;
import org.hibernate.HibernateException;
import org.hibernate.LockMode;
import org.hibernate.dialect.Dialect;
import org.hibernate.engine.jdbc.internal.FormatStyle;
import org.hibernate.engine.jdbc.spi.JdbcServices;
import org.hibernate.engine.jdbc.spi.SqlStatementLogger;
import org.hibernate.engine.spi.SessionImplementor;
import org.hibernate.id.IdentifierGenerationException;
import org.hibernate.id.IdentifierGeneratorHelper;
import org.hibernate.id.IntegralDataTypeHolder;
import org.hibernate.internal.CoreMessageLogger;
import org.hibernate.jdbc.AbstractReturningWork;
/**
* Describes a table used to mimic sequence behavior
*
* @author Steve Ebersole
*/
public class TableStructure implements DatabaseStructure {
private static final CoreMessageLogger LOG = Logger.getMessageLogger(CoreMessageLogger.class, TableStructure.class.getName());
private final String tableName;
private final String valueColumnName;
private final int initialValue;
private final int incrementSize;
private final Class numberType;
private final String selectQuery;
private final String updateQuery;
private boolean applyIncrementSizeToSourceValues;
private int accessCounter;
public TableStructure(
Dialect dialect,
String tableName,
String valueColumnName,
int initialValue,
int incrementSize,
Class numberType) {
this.tableName = tableName;
this.initialValue = initialValue;
this.incrementSize = incrementSize;
this.valueColumnName = valueColumnName;
this.numberType = numberType;
selectQuery = "select " + valueColumnName + " as id_val" +
" from " + dialect.appendLockHint( LockMode.PESSIMISTIC_WRITE, tableName ) +
dialect.getForUpdateString();
updateQuery = "update " + tableName +
" set " + valueColumnName + "= ?" +
" where " + valueColumnName + "=?";
}
@Override
public String getName() {
return tableName;
}
@Override
public int getInitialValue() {
return initialValue;
}
@Override
public int getIncrementSize() {
return incrementSize;
}
@Override
public int getTimesAccessed() {
return accessCounter;
}
@Override
public void prepare(Optimizer optimizer) {
applyIncrementSizeToSourceValues = optimizer.applyIncrementSizeToSourceValues();
}
@Override
public AccessCallback buildCallback(final SessionImplementor session) {
return new AccessCallback() {
@Override
public IntegralDataTypeHolder getNextValue() {
return session.getTransactionCoordinator().getTransaction().createIsolationDelegate().delegateWork(
new AbstractReturningWork<IntegralDataTypeHolder>() {
@Override
public IntegralDataTypeHolder execute(Connection connection) throws SQLException {
final SqlStatementLogger statementLogger = session
.getFactory()
.getServiceRegistry()
.getService( JdbcServices.class )
.getSqlStatementLogger();
IntegralDataTypeHolder value = IdentifierGeneratorHelper.getIntegralDataTypeHolder( numberType );
int rows;
do {
statementLogger.logStatement( selectQuery, FormatStyle.BASIC.getFormatter() );
PreparedStatement selectStatement = connection.prepareStatement( selectQuery );
try {
ResultSet selectRS = selectStatement.executeQuery();
if ( !selectRS.next() ) {
String err = "could not read a hi value - you need to populate the table: " + tableName;
LOG.error( err );
throw new IdentifierGenerationException( err );
}
value.initialize( selectRS, 1 );
selectRS.close();
}
catch ( SQLException sqle ) {
LOG.error( "could not read a hi value", sqle );
throw sqle;
}
finally {
selectStatement.close();
}
statementLogger.logStatement( updateQuery, FormatStyle.BASIC.getFormatter() );
PreparedStatement updatePS = connection.prepareStatement( updateQuery );
try {
final int increment = applyIncrementSizeToSourceValues ? incrementSize : 1;
final IntegralDataTypeHolder updateValue = value.copy().add( increment );
updateValue.bind( updatePS, 1 );
value.bind( updatePS, 2 );
rows = updatePS.executeUpdate();
}
catch ( SQLException e ) {
LOG.unableToUpdateQueryHiValue(tableName, e);
throw e;
}
finally {
updatePS.close();
}
} while ( rows == 0 );
accessCounter++;
return value;
}
},
true
);
}
};
}
@Override
public String[] sqlCreateStrings(Dialect dialect) throws HibernateException {
return new String[] {
dialect.getCreateTableString() + " " + tableName + " ( " + valueColumnName + " " + dialect.getTypeName( Types.BIGINT ) + " )",
"insert into " + tableName + " values ( " + initialValue + " )"
};
}
@Override
public String[] sqlDropStrings(Dialect dialect) throws HibernateException {
StringBuffer sqlDropString = new StringBuffer().append( "drop table " );
if ( dialect.supportsIfExistsBeforeTableName() ) {
sqlDropString.append( "if exists " );
}
sqlDropString.append( tableName ).append( dialect.getCascadeConstraintsString() );
if ( dialect.supportsIfExistsAfterTableName() ) {
sqlDropString.append( " if exists" );
}
return new String[] { sqlDropString.toString() };
}
}