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• RedshiftResultSet.java

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com.amazon.redshift.jdbc.RedshiftResultSet Maven / Gradle / Ivy

/*
 * Copyright (c) 2004, PostgreSQL Global Development Group
 * See the LICENSE file in the project root for more information.
 */

package com.amazon.redshift.jdbc;

import com.amazon.redshift.RedshiftResultSetMetaData;
import com.amazon.redshift.RedshiftStatement;
import com.amazon.redshift.core.BaseConnection;
import com.amazon.redshift.core.BaseStatement;
import com.amazon.redshift.core.Encoding;
import com.amazon.redshift.core.Field;
import com.amazon.redshift.core.Oid;
import com.amazon.redshift.core.Query;
import com.amazon.redshift.core.ResultCursor;
import com.amazon.redshift.core.ResultHandlerBase;
import com.amazon.redshift.core.Tuple;
import com.amazon.redshift.core.TypeInfo;
import com.amazon.redshift.core.Utils;
import com.amazon.redshift.core.v3.MessageLoopState;
import com.amazon.redshift.core.v3.RedshiftRowsBlockingQueue;
import com.amazon.redshift.logger.LogLevel;
import com.amazon.redshift.logger.RedshiftLogger;
import com.amazon.redshift.util.ByteConverter;
import com.amazon.redshift.util.GT;
import com.amazon.redshift.util.HStoreConverter;
import com.amazon.redshift.util.RedshiftBytea;
import com.amazon.redshift.util.RedshiftObject;
import com.amazon.redshift.util.RedshiftTokenizer;
import com.amazon.redshift.util.RedshiftVarbyte;
import com.amazon.redshift.util.RedshiftException;
import com.amazon.redshift.util.RedshiftGeography;
import com.amazon.redshift.util.RedshiftGeometry;
import com.amazon.redshift.util.RedshiftIntervalYearToMonth;
import com.amazon.redshift.util.RedshiftIntervalDayToSecond;
import com.amazon.redshift.util.RedshiftState;

import java.io.ByteArrayInputStream;
import java.io.CharArrayReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.io.UnsupportedEncodingException;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.math.RoundingMode;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.sql.Array;
import java.sql.Blob;
import java.sql.Clob;
import java.sql.Date;
import java.sql.NClob;
import java.sql.PreparedStatement;
import java.sql.Ref;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.RowId;
import java.sql.SQLException;
import java.sql.SQLWarning;
import java.sql.SQLXML;
import java.sql.Statement;
import java.sql.Time;
import java.sql.Timestamp;
import java.sql.Types;
//JCP! if mvn.project.property.redshift.jdbc.spec >= "JDBC4.2"
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.OffsetDateTime;
//JCP! endif
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Calendar;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.StringTokenizer;
import java.util.TimeZone;
import java.util.UUID;
import java.util.concurrent.TimeUnit;

public class RedshiftResultSet implements ResultSet, com.amazon.redshift.RedshiftRefCursorResultSet {

  // needed for updateable result set support
  private boolean updateable = false;
  private boolean doingUpdates = false;
  private HashMap updateValues = null;
  private boolean usingOID = false; // are we using the OID for the primary key?
  private List primaryKeys; // list of primary keys
  private boolean singleTable = false;
  private String onlyTable = "";
  private String tableName = null;
  private PreparedStatement updateStatement = null;
  private PreparedStatement insertStatement = null;
  private PreparedStatement deleteStatement = null;
  private PreparedStatement selectStatement = null;
  private final int resultsettype;
  private final int resultsetconcurrency;
  private int fetchdirection = ResultSet.FETCH_UNKNOWN;
  private TimeZone defaultTimeZone;
  protected final BaseConnection connection; // the connection we belong to
  protected final BaseStatement statement; // the statement we belong to
  protected final Field[] fields; // Field metadata for this resultset.
  protected final Query originalQuery; // Query we originated from

  protected final int maxRows; // Maximum rows in this resultset (might be 0).
  protected final int maxFieldSize; // Maximum field size in this resultset (might be 0).

  protected List rows; // Current page of results.
  protected RedshiftRowsBlockingQueue queueRows; // Results in a blocking queue.
  protected int[] rowCount;
  protected Thread ringBufferThread;
  protected int currentRow = -1; // Index into 'rows' of our currrent row (0-based)
  protected int rowOffset; // Offset of row 0 in the actual resultset
  protected Tuple thisRow; // copy of the current result row
  protected SQLWarning warnings = null; // The warning chain
  /**
   * True if the last obtained column value was SQL NULL as specified by {@link #wasNull}. The value
   * is always updated by the {@link #checkResultSet} method.
   */
  protected boolean wasNullFlag = false;
  protected boolean onInsertRow = false;
  // are we on the insert row (for JDBC2 updatable resultsets)?

  private Tuple rowBuffer = null; // updateable rowbuffer

  protected int fetchSize; // Current fetch size (might be 0).
  protected ResultCursor cursor; // Cursor for fetching additional data.

  private Map columnNameIndexMap; // Speed up findColumn by caching lookups

  private ResultSetMetaData rsMetaData;

  protected ResultSetMetaData createMetaData() throws SQLException {
    return new RedshiftResultSetMetaDataImpl(connection, fields);
  }

  public ResultSetMetaData getMetaData() throws SQLException {
    checkClosed();
    if (rsMetaData == null) {
      rsMetaData = createMetaData();
    }
    return rsMetaData;
  }

  RedshiftResultSet(Query originalQuery, BaseStatement statement, Field[] fields, List tuples,
      ResultCursor cursor, int maxRows, int maxFieldSize, int rsType, int rsConcurrency,
      int rsHoldability, RedshiftRowsBlockingQueue queueTuples,
      int[] rowCount, Thread ringBufferThread) throws SQLException {
    // Fail-fast on invalid null inputs
    if (tuples == null && queueTuples == null) {
      throw new NullPointerException("tuples or queueTuples must be non-null");
    }
    if (fields == null) {
      throw new NullPointerException("fields must be non-null");
    }

    this.originalQuery = originalQuery;
    this.connection = (BaseConnection) statement.getConnection();
    this.statement = statement;
    this.fields = fields;
    this.rows = tuples;
    this.cursor = cursor;
    this.maxRows = maxRows;
    this.maxFieldSize = maxFieldSize;
    this.resultsettype = rsType;
    this.resultsetconcurrency = rsConcurrency;
    this.queueRows = queueTuples;
    this.rowCount = rowCount;
    this.ringBufferThread = ringBufferThread; 
  }

  /**
   * Returns the number of rows in the result set. The value returned is undefined if the row
   * count is unknown.
   * 

   * The value returned must fit into a 32-bit integer when targeting a 32-bit platform, or a
   * 64-bit integer for a 64-bit platform. The value must be non-negative, except if the row count
   * is unknown.
   * 

   *
   * This is not a JDBC specification method.
   * This is for backward compatibility only.
   * 
   * @return Number of rows in the result set.
   * @throws SQLException
   *             If an error occurs.
   */
  public long getRowCount() throws SQLException {
    checkClosed();
  	return (rowCount != null) ? rowCount[0] : -1;
  }
  
  public java.net.URL getURL(int columnIndex) throws SQLException {
    if (RedshiftLogger.isEnable())
    	connection.getLogger().log(LogLevel.DEBUG, "  getURL columnIndex: {0}", columnIndex);
    checkClosed();
    throw com.amazon.redshift.Driver.notImplemented(this.getClass(), "getURL(int)");
  }

  public java.net.URL getURL(String columnName) throws SQLException {
    return getURL(findColumn(columnName));
  }

  protected Object internalGetObject(int columnIndex, Field field) throws SQLException {
    switch (getSQLType(columnIndex)) {
      case Types.BOOLEAN:
      case Types.BIT:
        return getBoolean(columnIndex);
      case Types.SQLXML:
        return getSQLXML(columnIndex);
      case Types.TINYINT:
      case Types.SMALLINT:
      case Types.INTEGER:
        return getInt(columnIndex);
      case Types.BIGINT:
        return getLong(columnIndex);
      case Types.NUMERIC:
      case Types.DECIMAL:
        return getNumeric(columnIndex,
            (field.getMod() == -1) ? -1 : ((field.getMod() - 4) & 0xffff), true);
      case Types.REAL:
        return getFloat(columnIndex);
      case Types.FLOAT:
      case Types.DOUBLE:
        return getDouble(columnIndex);
      case Types.CHAR:
      case Types.VARCHAR:
      case Types.LONGVARCHAR:
        return getString(columnIndex);
      case Types.DATE:
        return getDate(columnIndex);
      case Types.TIME:
        return getTime(columnIndex);
      case Types.TIMESTAMP:
        return getTimestamp(columnIndex, null);
      case Types.BINARY:
      case Types.VARBINARY:
      case Types.LONGVARBINARY:
        return getBytes(columnIndex);
      case Types.ARRAY:
        return getArray(columnIndex);
      case Types.CLOB:
        return getClob(columnIndex);
      case Types.BLOB:
        return getBlob(columnIndex);
      case Types.OTHER:
        if (field.getOID() == Oid.INTERVALY2M)
          return getIntervalYearToMonth(columnIndex);
        if (field.getOID() == Oid.INTERVALD2S)
          return getIntervalDayToSecond(columnIndex);

      default:
        String type = getRSType(columnIndex);

        // if the backend doesn't know the type then coerce to String
        if (type.equals("unknown")) {
          return getString(columnIndex);
        }

        if (type.equals("uuid")) {
          if (isBinary(columnIndex)) {
            return getUUID(thisRow.get(columnIndex - 1));
          }
          return getUUID(getString(columnIndex));
        }

        // Specialized support for ref cursors is neater.
        if (type.equals("refcursor")) {
          // Fetch all results.
          String cursorName = getString(columnIndex);

          StringBuilder sb = new StringBuilder("FETCH ALL IN ");
          Utils.escapeIdentifier(sb, cursorName);

          // nb: no BEGIN triggered here. This is fine. If someone
          // committed, and the cursor was not holdable (closing the
          // cursor), we avoid starting a new xact and promptly causing
          // it to fail. If the cursor *was* holdable, we don't want a
          // new xact anyway since holdable cursor state isn't affected
          // by xact boundaries. If our caller didn't commit at all, or
          // autocommit was on, then we wouldn't issue a BEGIN anyway.
          //
          // We take the scrollability from the statement, but until
          // we have updatable cursors it must be readonly.
          ResultSet rs =
              connection.execSQLQuery(sb.toString(), resultsettype, ResultSet.CONCUR_READ_ONLY);
          //
          // In long running transactions these backend cursors take up memory space
          // we could close in rs.close(), but if the transaction is closed before the result set,
          // then
          // the cursor no longer exists

          sb.setLength(0);
          sb.append("CLOSE ");
          Utils.escapeIdentifier(sb, cursorName);
          connection.execSQLUpdate(sb.toString());
          ((RedshiftResultSet) rs).setRefCursor(cursorName);
          return rs;
        }
        if ("hstore".equals(type)) {
          if (isBinary(columnIndex)) {
            return HStoreConverter.fromBytes(thisRow.get(columnIndex - 1), connection.getEncoding());
          }
          return HStoreConverter.fromString(getString(columnIndex));
        }

        // Caller determines what to do (JDBC3 overrides in this case)
        return null;
    }
  }

  private void checkScrollable() throws SQLException {
    checkClosed();
    if (resultsettype == ResultSet.TYPE_FORWARD_ONLY) {
      throw new RedshiftException(
          GT.tr("Operation requires a scrollable ResultSet, but this ResultSet is FORWARD_ONLY."),
          RedshiftState.INVALID_CURSOR_STATE);
    }
  }

  @Override
  public boolean absolute(int index) throws SQLException {
    checkScrollable();

    // index is 1-based, but internally we use 0-based indices
    int internalIndex;

    if (index == 0) {
      beforeFirst();
      return false;
    }

    final int rows_size = rows.size();

    // if index<0, count from the end of the result set, but check
    // to be sure that it is not beyond the first index
    if (index < 0) {
      if (index >= -rows_size) {
        internalIndex = rows_size + index;
      } else {
        beforeFirst();
        return false;
      }
    } else {
      // must be the case that index>0,
      // find the correct place, assuming that
      // the index is not too large
      if (index <= rows_size) {
        internalIndex = index - 1;
      } else {
        afterLast();
        return false;
      }
    }

    currentRow = internalIndex;
    initRowBuffer();
    onInsertRow = false;

    return true;
  }

  @Override
  public void afterLast() throws SQLException {
    checkScrollable();

    final int rows_size = rows.size();
    if (rows_size > 0) {
      currentRow = rows_size;
    }

    onInsertRow = false;
    thisRow = null;
    rowBuffer = null;
  }

  @Override
  public void beforeFirst() throws SQLException {
    checkScrollable();

    if (!rows.isEmpty()) {
      currentRow = -1;
    }

    onInsertRow = false;
    thisRow = null;
    rowBuffer = null;
  }

  @Override
  public boolean first() throws SQLException {
    checkScrollable();

    if (rows.size() <= 0) {
      return false;
    }

    currentRow = 0;
    initRowBuffer();
    onInsertRow = false;

    return true;
  }

  @Override
  public Array getArray(String colName) throws SQLException {
    return getArray(findColumn(colName));
  }

  protected Array makeArray(int oid, byte[] value) throws SQLException {
    return new RedshiftArray(connection, oid, value);
  }

  protected Array makeArray(int oid, String value) throws SQLException {
    return new RedshiftArray(connection, oid, value);
  }

  @Override
  public Array getArray(int i) throws SQLException {
    checkResultSet(i);
    if (wasNullFlag) {
      return null;
    }

    int oid = fields[i - 1].getOID();
    if (isBinary(i)) {
      return makeArray(oid, thisRow.get(i - 1));
    }
    return makeArray(oid, getFixedString(i));
  }

  public java.math.BigDecimal getBigDecimal(int columnIndex) throws SQLException {
    return getBigDecimal(columnIndex, -1);
  }

  public java.math.BigDecimal getBigDecimal(String columnName) throws SQLException {
    return getBigDecimal(findColumn(columnName));
  }

  public Blob getBlob(String columnName) throws SQLException {
    return getBlob(findColumn(columnName));
  }

  protected Blob makeBlob(long oid) throws SQLException {
    return new RedshiftBlob(connection, oid);
  }

  public Blob getBlob(int i) throws SQLException {
    checkResultSet(i);
    if (wasNullFlag) {
      return null;
    }

    return makeBlob(getLong(i));
  }

  public java.io.Reader getCharacterStream(String columnName) throws SQLException {
    return getCharacterStream(findColumn(columnName));
  }

  public java.io.Reader getCharacterStream(int i) throws SQLException {
    checkResultSet(i);
    if (wasNullFlag) {
      return null;
    }

    // Version 7.2 supports AsciiStream for all the RS text types
    // As the spec/javadoc for this method indicate this is to be used for
    // large text values (i.e. LONGVARCHAR) RS doesn't have a separate
    // long string datatype, but with toast the text datatype is capable of
    // handling very large values. Thus the implementation ends up calling
    // getString() since there is no current way to stream the value from the server
    return new CharArrayReader(getString(i).toCharArray());
  }

  public Clob getClob(String columnName) throws SQLException {
    return getClob(findColumn(columnName));
  }

  protected Clob makeClob(long oid) throws SQLException {
    return new RedshiftClob(connection, oid);
  }

  public Clob getClob(int i) throws SQLException {
    checkResultSet(i);
    if (wasNullFlag) {
      return null;
    }

    return makeClob(getLong(i));
  }

  public int getConcurrency() throws SQLException {
    checkClosed();
    return resultsetconcurrency;
  }

  @Override
  public java.sql.Date getDate(int i, java.util.Calendar cal) throws SQLException {
    checkResultSet(i);
    if (wasNullFlag) {
      return null;
    }

    if (cal == null) {
      cal = getDefaultCalendar();
    }
    if (isBinary(i)) {
      int col = i - 1;
      int oid = fields[col].getOID();
      TimeZone tz = cal.getTimeZone();
      if (oid == Oid.DATE) {
        return connection.getTimestampUtils().toDateBin(tz, thisRow.get(col));
      } else if (oid == Oid.TIMESTAMP || oid == Oid.TIMESTAMPTZ) {
        // If backend provides just TIMESTAMP, we use "cal" timezone
        // If backend provides TIMESTAMPTZ, we ignore "cal" as we know true instant value
        Timestamp timestamp = getTimestamp(i, cal);
        // Here we just truncate date to 00:00 in a given time zone
        return connection.getTimestampUtils().convertToDate(timestamp.getTime(), tz);
      } else {
        	return connection.getTimestampUtils().toDate(cal, getString(i));
      }
    }

    return connection.getTimestampUtils().toDate(cal, getString(i));
  }

  @Override
  public Time getTime(int i, java.util.Calendar cal) throws SQLException {
    checkResultSet(i);
    if (wasNullFlag) {
      return null;
    }

    if (cal == null) {
      cal = getDefaultCalendar();
    }
    if (isBinary(i)) {
      int col = i - 1;
      int oid = fields[col].getOID();
      TimeZone tz = cal.getTimeZone();
      if (oid == Oid.TIME || oid == Oid.TIMETZ) {
        return connection.getTimestampUtils().toTimeBin(tz, thisRow.get(col));
      } else if (oid == Oid.TIMESTAMP || oid == Oid.TIMESTAMPTZ) {
        // If backend provides just TIMESTAMP, we use "cal" timezone
        // If backend provides TIMESTAMPTZ, we ignore "cal" as we know true instant value
        Timestamp timestamp = getTimestamp(i, cal);
        long timeMillis = timestamp.getTime();
        if (oid == Oid.TIMESTAMPTZ) {
          // time zone == UTC since BINARY "timestamp with time zone" is always sent in UTC
          // So we truncate days
          return new Time(timeMillis % TimeUnit.DAYS.toMillis(1));
        }
        // Here we just truncate date part
        return connection.getTimestampUtils().convertToTime(timeMillis, tz);
      } else {
        throw new RedshiftException(
            GT.tr("Cannot convert the column of type {0} to requested type {1}.",
                Oid.toString(oid), "time"),
            RedshiftState.DATA_TYPE_MISMATCH);
      }
    }

    String string = getString(i);
    return connection.getTimestampUtils().toTime(cal, string);
  }

  //JCP! if mvn.project.property.redshift.jdbc.spec >= "JDBC4.2"
  private LocalTime getLocalTime(int i) throws SQLException {
    checkResultSet(i);
    if (wasNullFlag) {
      return null;
    }

    if (isBinary(i)) {
      int col = i - 1;
      int oid = fields[col].getOID();
      if (oid == Oid.TIME) {
        return connection.getTimestampUtils().toLocalTimeBin(thisRow.get(col));
      } else {
        throw new RedshiftException(
            GT.tr("Cannot convert the column of type {0} to requested type {1}.",
                Oid.toString(oid), "time"),
            RedshiftState.DATA_TYPE_MISMATCH);
      }
    }

    String string = getString(i);
    return connection.getTimestampUtils().toLocalTime(string);
  }
  //JCP! endif

  @Override
  public Timestamp getTimestamp(int i, java.util.Calendar cal) throws SQLException {
    checkResultSet(i);
    if (wasNullFlag) {
      return null;
    }

    if (cal == null) {
      cal = getDefaultCalendar();
    }
    int col = i - 1;
    int oid = fields[col].getOID();
    if (isBinary(i)) {
      if (oid == Oid.TIMESTAMPTZ || oid == Oid.TIMESTAMP || oid == Oid.ABSTIMEOID) {
        boolean hasTimeZone = oid == Oid.TIMESTAMPTZ;
        TimeZone tz = cal.getTimeZone();
        if(oid == Oid.ABSTIMEOID)
          return connection.getTimestampUtils().toTimestampAbsTimeBin(tz, thisRow.get(col), hasTimeZone, cal);
        else
          return connection.getTimestampUtils().toTimestampBin(tz, thisRow.get(col), hasTimeZone, cal);
      } else {
        // JDBC spec says getTimestamp of Time and Date must be supported
        long millis;
        if (oid == Oid.TIME || oid == Oid.TIMETZ) {
          millis = getTime(i, cal).getTime();
          return new Timestamp(millis);
        } else if (oid == Oid.DATE) {
          millis = getDate(i, cal).getTime();
          return new Timestamp(millis);
        } 
      }
    }

    // If this is actually a timestamptz, the server-provided timezone will override
    // the one we pass in, which is the desired behaviour. Otherwise, we'll
    // interpret the timezone-less value in the provided timezone.
    String string = getString(i);
    if (oid == Oid.TIME || oid == Oid.TIMETZ) {
      // If server sends us a TIME, we ensure java counterpart has date of 1970-01-01
      return new Timestamp(connection.getTimestampUtils().toTime(cal, string).getTime());
    }
    return connection.getTimestampUtils().toTimestamp(cal, string);
  }

  //JCP! if mvn.project.property.redshift.jdbc.spec >= "JDBC4.2"
  private OffsetDateTime getOffsetDateTime(int i) throws SQLException {
    checkResultSet(i);
    if (wasNullFlag) {
      return null;
    }

    int col = i - 1;
    int oid = fields[col].getOID();

    if (isBinary(i)) {
      if (oid == Oid.TIMESTAMPTZ || oid == Oid.TIMESTAMP) {
        return connection.getTimestampUtils().toOffsetDateTimeBin(thisRow.get(col));
      } else if (oid == Oid.TIMETZ) {
        // JDBC spec says timetz must be supported
        Time time = getTime(i);
        return connection.getTimestampUtils().toOffsetDateTime(time);
      } else {
        throw new RedshiftException(
            GT.tr("Cannot convert the column of type {0} to requested type {1}.",
                Oid.toString(oid), "timestamptz"),
            RedshiftState.DATA_TYPE_MISMATCH);
      }
    }

    // If this is actually a timestamptz, the server-provided timezone will override
    // the one we pass in, which is the desired behaviour. Otherwise, we'll
    // interpret the timezone-less value in the provided timezone.
    String string = getString(i);
    if (oid == Oid.TIMETZ) {
      // JDBC spec says timetz must be supported
      // If server sends us a TIMETZ, we ensure java counterpart has date of 1970-01-01
      Calendar cal = getDefaultCalendar();
      Time time = connection.getTimestampUtils().toTime(cal, string);
      return connection.getTimestampUtils().toOffsetDateTime(time);
    }
    return connection.getTimestampUtils().toOffsetDateTime(string);
  }

  private LocalDateTime getLocalDateTime(int i) throws SQLException {
    checkResultSet(i);
    if (wasNullFlag) {
      return null;
    }

    int col = i - 1;
    int oid = fields[col].getOID();
    if (oid != Oid.TIMESTAMP) {
      throw new RedshiftException(
              GT.tr("Cannot convert the column of type {0} to requested type {1}.",
                  Oid.toString(oid), "timestamp"),
              RedshiftState.DATA_TYPE_MISMATCH);
    }
    if (isBinary(i)) {
      return connection.getTimestampUtils().toLocalDateTimeBin(thisRow.get(col));
    }

    String string = getString(i);
    return connection.getTimestampUtils().toLocalDateTime(string);
  }
  //JCP! endif

  public java.sql.Date getDate(String c, java.util.Calendar cal) throws SQLException {
    return getDate(findColumn(c), cal);
  }

  public Time getTime(String c, java.util.Calendar cal) throws SQLException {
    return getTime(findColumn(c), cal);
  }

  public Timestamp getTimestamp(String c, java.util.Calendar cal) throws SQLException {
    return getTimestamp(findColumn(c), cal);
  }

  public int getFetchDirection() throws SQLException {
    checkClosed();
    return fetchdirection;
  }

  public Object getObjectImpl(String columnName, Map> map) throws SQLException {
    return getObjectImpl(findColumn(columnName), map);
  }

  /*
   * This checks against map for the type of column i, and if found returns an object based on that
   * mapping. The class must implement the SQLData interface.
   */
  public Object getObjectImpl(int i, Map> map) throws SQLException {
    checkClosed();
    if (map == null || map.isEmpty()) {
      return getObject(i);
    }
    throw com.amazon.redshift.Driver.notImplemented(this.getClass(), "getObjectImpl(int,Map)");
  }

  public Ref getRef(String columnName) throws SQLException {
    return getRef(findColumn(columnName));
  }

  public Ref getRef(int i) throws SQLException {
    checkClosed();
    // The backend doesn't yet have SQL3 REF types
    throw com.amazon.redshift.Driver.notImplemented(this.getClass(), "getRef(int)");
  }

  @Override
  public int getRow() throws SQLException {
    checkClosed();

    if (onInsertRow) {
      return 0;
    }

    if (queueRows != null) {
    	int rowIndex = queueRows.getCurrentRowIndex();
    	
    	if (rowIndex < 0 || rowIndex >= getRowCount())
    		return 0;
    	else
    		return rowIndex + 1;
    }
    else {
	    final int rows_size = rows.size();
	
	    if (currentRow < 0 || currentRow >= rows_size) {
	      return 0;
	    }
	
	    return rowOffset + currentRow + 1;
    }
  }

  // This one needs some thought, as not all ResultSets come from a statement
  public Statement getStatement() throws SQLException {
    checkClosed();
    return statement;
  }

  public int getType() throws SQLException {
    checkClosed();
    return resultsettype;
  }

  @Override
  public boolean isAfterLast() throws SQLException {
    checkClosed();
    if (onInsertRow) {
      return false;
    }

    if (queueRows != null) {
    	if(getRowCount() == 0)
    		return false;
    	
    	return(queueRows.endOfResult()
    					&& queueRows.getCurrentRowIndex() >= getRowCount());
    }
    else {
	    final int rows_size = rows.size();
	    if (rowOffset + rows_size == 0) {
	      return false;
	    }
	    return (currentRow >= rows_size);
    }
  }

  @Override
  public boolean isBeforeFirst() throws SQLException {
    checkClosed();
    if (onInsertRow) {
      return false;
    }

    if (queueRows != null) {
    	return (queueRows.getCurrentRowIndex() < 0 
    					&& getRowCount() > 0);
    }
    else {
    	return ((rowOffset + currentRow) < 0 && !rows.isEmpty());
    }
  }

  @Override
  public boolean isFirst() throws SQLException {
    checkClosed();
    if (onInsertRow) {
      return false;
    }

    if (queueRows != null) {
    	if(getRowCount() == 0)
    		return false;
    	
    	return(queueRows.getCurrentRowIndex() == 0);
    }
    else {
	    final int rows_size = rows.size();
	    if (rowOffset + rows_size == 0) {
	      return false;
	    }
	
	    return ((rowOffset + currentRow) == 0);
    }
  }

  @Override
  public boolean isLast() throws SQLException {
    checkClosed();
    if (onInsertRow) {
      return false;
    }

    if (queueRows != null) {
    	if(getRowCount() == 0)
    		return false;
    	
    	return(queueRows.endOfResult()
    					&& ((queueRows.getCurrentRowIndex() + 1) == getRowCount()));
    }
    else {
	    final int rows_size = rows.size();
	
	    if (rows_size == 0) {
	      return false; // No rows.
	    }
	
	    if (currentRow != (rows_size - 1)) {
	      return false; // Not on the last row of this block.
	    }
	
	    // We are on the last row of the current block.
	
	    if (cursor == null) {
	      // This is the last block and therefore the last row.
	      return true;
	    }
	
	    if (maxRows > 0 && rowOffset + currentRow == maxRows) {
	      // We are implicitly limited by maxRows.
	      return true;
	    }
	
	    // Now the more painful case begins.
	    // We are on the last row of the current block, but we don't know if the
	    // current block is the last block; we must try to fetch some more data to
	    // find out.
	
	    // We do a fetch of the next block, then prepend the current row to that
	    // block (so currentRow == 0). This works as the current row
	    // must be the last row of the current block if we got this far.
	
	    rowOffset += rows_size - 1; // Discarding all but one row.
	
	    // Work out how many rows maxRows will let us fetch.
	    int fetchRows = fetchSize;
	    if (maxRows != 0) {
	      if (fetchRows == 0 || rowOffset + fetchRows > maxRows) {
	        // Fetch would exceed maxRows, limit it.
	        fetchRows = maxRows - rowOffset;
	      }
	    }
	
	    // Do the actual fetch.
	    connection.getQueryExecutor().fetch(cursor, new CursorResultHandler(), fetchRows, 0);
	
	    // Now prepend our one saved row and move to it.
	    rows.add(0, thisRow);
	    currentRow = 0;
	
	    // Finally, now we can tell if we're the last row or not.
	    return (rows.size() == 1);
    }
  }

  @Override
  public boolean last() throws SQLException {
    checkScrollable();

    final int rows_size = rows.size();
    if (rows_size <= 0) {
      return false;
    }

    currentRow = rows_size - 1;
    initRowBuffer();
    onInsertRow = false;

    return true;
  }

  @Override
  public boolean previous() throws SQLException {
    checkScrollable();

    if (onInsertRow) {
      throw new RedshiftException(GT.tr("Can''t use relative move methods while on the insert row."),
          RedshiftState.INVALID_CURSOR_STATE);
    }

    if (currentRow - 1 < 0) {
      currentRow = -1;
      thisRow = null;
      rowBuffer = null;
      return false;
    } else {
      currentRow--;
    }
    initRowBuffer();
    return true;
  }

  @Override
  public boolean relative(int rows) throws SQLException {
    checkScrollable();

    if (onInsertRow) {
      throw new RedshiftException(GT.tr("Can''t use relative move methods while on the insert row."),
          RedshiftState.INVALID_CURSOR_STATE);
    }

    // have to add 1 since absolute expects a 1-based index
    int index = currentRow + 1 + rows;
    if (index < 0) {
      beforeFirst();
      return false;
    }
    return absolute(index);
  }

  public void setFetchDirection(int direction) throws SQLException {
    if (RedshiftLogger.isEnable()) 
    	connection.getLogger().logFunction(true, direction);
  	
    checkClosed();
    switch (direction) {
      case ResultSet.FETCH_FORWARD:
        break;
      case ResultSet.FETCH_REVERSE:
      case ResultSet.FETCH_UNKNOWN:
        checkScrollable();
        break;
      default:
        throw new RedshiftException(GT.tr("Invalid fetch direction constant: {0}.", direction),
            RedshiftState.INVALID_PARAMETER_VALUE);
    }

    this.fetchdirection = direction;
  }

  public synchronized void cancelRowUpdates() throws SQLException {
    checkClosed();
    if (onInsertRow) {
      throw new RedshiftException(GT.tr("Cannot call cancelRowUpdates() when on the insert row."),
          RedshiftState.INVALID_CURSOR_STATE);
    }

    if (doingUpdates) {
      doingUpdates = false;

      clearRowBuffer(true);
    }
  }

  public synchronized void deleteRow() throws SQLException {
    checkUpdateable();

    if (onInsertRow) {
      throw new RedshiftException(GT.tr("Cannot call deleteRow() when on the insert row."),
          RedshiftState.INVALID_CURSOR_STATE);
    }

    if (isBeforeFirst()) {
      throw new RedshiftException(
          GT.tr(
              "Currently positioned before the start of the ResultSet.  You cannot call deleteRow() here."),
          RedshiftState.INVALID_CURSOR_STATE);
    }
    if (isAfterLast()) {
      throw new RedshiftException(
          GT.tr(
              "Currently positioned after the end of the ResultSet.  You cannot call deleteRow() here."),
          RedshiftState.INVALID_CURSOR_STATE);
    }
    
    if(queueRows != null) {
      throw new RedshiftException(GT.tr("Cannot call deleteRow() when enableFetchRingBuffer is true."),
          RedshiftState.INVALID_CURSOR_STATE);
    }
    else {
	    if (rows.isEmpty()) {
	      throw new RedshiftException(GT.tr("There are no rows in this ResultSet."),
	          RedshiftState.INVALID_CURSOR_STATE);
	    }
	
	    int numKeys = primaryKeys.size();
	    if (deleteStatement == null) {
	      StringBuilder deleteSQL =
	          new StringBuilder("DELETE FROM ").append(onlyTable).append(tableName).append(" where ");
	
	      for (int i = 0; i < numKeys; i++) {
	        Utils.escapeIdentifier(deleteSQL, primaryKeys.get(i).name);
	        deleteSQL.append(" = ?");
	        if (i < numKeys - 1) {
	          deleteSQL.append(" and ");
	        }
	      }
	
	      deleteStatement = connection.prepareStatement(deleteSQL.toString());
	    }
	    deleteStatement.clearParameters();
	
	    for (int i = 0; i < numKeys; i++) {
	      deleteStatement.setObject(i + 1, primaryKeys.get(i).getValue());
	    }
	
	    deleteStatement.executeUpdate();
	
	    rows.remove(currentRow);
	    currentRow--;
	    moveToCurrentRow();
    }
  }

  @Override
  public synchronized void insertRow() throws SQLException {
    checkUpdateable();

    if (!onInsertRow) {
      throw new RedshiftException(GT.tr("Not on the insert row."), RedshiftState.INVALID_CURSOR_STATE);
    } else if (updateValues.isEmpty()) {
      throw new RedshiftException(GT.tr("You must specify at least one column value to insert a row."),
          RedshiftState.INVALID_PARAMETER_VALUE);
    } else if(queueRows != null) {
	      throw new RedshiftException(GT.tr("Cannot call insertRow() when enableFetchRingBuffer is true."),
	          RedshiftState.INVALID_CURSOR_STATE);
    } else {

      // loop through the keys in the insertTable and create the sql statement
      // we have to create the sql every time since the user could insert different
      // columns each time

      StringBuilder insertSQL = new StringBuilder("INSERT INTO ").append(tableName).append(" (");
      StringBuilder paramSQL = new StringBuilder(") values (");

      Iterator columnNames = updateValues.keySet().iterator();
      int numColumns = updateValues.size();

      for (int i = 0; columnNames.hasNext(); i++) {
        String columnName = columnNames.next();

        Utils.escapeIdentifier(insertSQL, columnName);
        if (i < numColumns - 1) {
          insertSQL.append(", ");
          paramSQL.append("?,");
        } else {
          paramSQL.append("?)");
        }

      }

      insertSQL.append(paramSQL.toString());
      insertStatement = connection.prepareStatement(insertSQL.toString());

      Iterator