package org.hibernate.dialect;
import java.sql.Types;
import org.hibernate.sql.CaseFragment;
import org.hibernate.sql.ANSICaseFragment;
/**
* A dialect for Oracle 9i databases.
* <p/>
* Unlike the older {@link org.hibernate.dialect.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();
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 <= ?) where rownum_ > ?");
}
else {
pagingSelect.append(" ) where rownum <= ?");
}
if ( isForUpdate ) {
pagingSelect.append( " for update" );
}
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";
}
}