/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2010, 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.dialect;
import java.sql.Types;
import org.hibernate.LockOptions;
import org.hibernate.sql.CaseFragment;
import org.hibernate.sql.ANSICaseFragment;
/**
* A dialect for Oracle 9i databases.
* <p/>
* Unlike the older (deprecated) {@link Oracle9Dialect}, this version specifies
* to not use "ANSI join syntax" because 9i does not seem to properly
* handle it in all cases.
*
* @author Steve Ebersole
*/
public class Oracle9iDialect extends Oracle8iDialect {
protected void registerCharacterTypeMappings() {
registerColumnType( Types.CHAR, "char(1 char)" );
registerColumnType( Types.VARCHAR, 4000, "varchar2($l char)" );
registerColumnType( Types.VARCHAR, "long" );
}
protected void registerDateTimeTypeMappings() {
registerColumnType( Types.DATE, "date" );
registerColumnType( Types.TIME, "date" );
registerColumnType( Types.TIMESTAMP, "timestamp" );
}
public CaseFragment createCaseFragment() {
// Oracle did add support for ANSI CASE statements in 9i
return new ANSICaseFragment();
}
public String getLimitString(String sql, boolean hasOffset) {
sql = sql.trim();
String forUpdateClause = null;
boolean isForUpdate = false;
final int forUpdateIndex = sql.toLowerCase().lastIndexOf( "for update") ;
if ( forUpdateIndex > -1 ) {
// save 'for update ...' and then remove it
forUpdateClause = sql.substring( forUpdateIndex );
sql = sql.substring( 0, forUpdateIndex-1 );
isForUpdate = true;
}
StringBuffer pagingSelect = new StringBuffer( sql.length()+100 );
if (hasOffset) {
pagingSelect.append("select * from ( select row_.*, rownum rownum_ from ( ");
}
else {
pagingSelect.append("select * from ( ");
}
pagingSelect.append(sql);
if (hasOffset) {
pagingSelect.append(" ) row_ where rownum <= ?) where rownum_ > ?");
}
else {
pagingSelect.append(" ) where rownum <= ?");
}
if ( isForUpdate ) {
pagingSelect.append( " " );
pagingSelect.append( forUpdateClause );
}
return pagingSelect.toString();
}
public String getSelectClauseNullString(int sqlType) {
return getBasicSelectClauseNullString( sqlType );
}
public String getCurrentTimestampSelectString() {
return "select systimestamp from dual";
}
public String getCurrentTimestampSQLFunctionName() {
// the standard SQL function name is current_timestamp...
return "current_timestamp";
}
// locking support
public String getForUpdateString() {
return " for update";
}
public String getWriteLockString(int timeout) {
if ( timeout == LockOptions.NO_WAIT ) {
return " for update nowait";
}
else if ( timeout > 0 ) {
// convert from milliseconds to seconds
float seconds = timeout / 1000.0f;
timeout = Math.round(seconds);
return " for update wait " + timeout;
}
else
return " for update";
}
public String getReadLockString(int timeout) {
return getWriteLockString( timeout );
}
/**
* HHH-4907, I don't know if oracle 8 supports this syntax, so I'd think it is better add this
* method here. Reopen this issue if you found/know 8 supports it.
*/
public boolean supportsRowValueConstructorSyntaxInInList() {
return true;
}
public boolean supportsTupleDistinctCounts() {
return false;
}
}