public OracleDialect() 
{
	  
		super();
		log.warn( "The OracleDialect dialect has been deprecated; use Oracle8iDialect instead" );
		// Oracle8 and previous define only a "DATE" type which
		//      is used to represent all aspects of date/time
		registerColumnType( Types.TIMESTAMP, "date" );
		registerColumnType( Types.CHAR, "char(1)" );
		registerColumnType( Types.VARCHAR, 4000, "varchar2($l)" );
}

 public CaseFragment createCaseFragment() 
{
		return new DecodeCaseFragment();
}

 public JoinFragment createOuterJoinFragment() 
{
		return new OracleJoinFragment();
}

 public String getCurrentTimestampSQLFunctionName() 
{
		return "sysdate";
}

 public String getCurrentTimestampSelectString() 
{
		return "select sysdate from dual";
}

 public String getLimitString(String sql,
    boolean hasOffset) 
{
		sql = sql.trim();
		boolean isForUpdate = false;
		if ( sql.toLowerCase().endsWith(" for update") ) {
			sql = sql.substring( 0, sql.length()-11 );
			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_ < = ? and rownum_  > ?");
		}
		else {
			pagingSelect.append(" ) where rownum < = ?");
		}
		if ( isForUpdate ) {
			pagingSelect.append( " for update" );
		}
		return pagingSelect.toString();
}

 public String getSelectClauseNullString(int sqlType) 
{
		switch(sqlType) {
			case Types.VARCHAR:
			case Types.CHAR:
				return "to_char(null)";
			case Types.DATE:
			case Types.TIMESTAMP:
			case Types.TIME:
				return "to_date(null)";
			default:
				return "to_number(null)";
		}
}