abstractresultset.java

来自「RESIN 3.2 最新源码」· Java 代码 · 共 886 行 · 第 1/2 页

/*
 * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
 *
 * This file is part of Resin(R) Open Source
 *
 * Each copy or derived work must preserve the copyright notice and this
 * notice unmodified.
 *
 * Resin Open Source is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Resin Open Source 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, or any warranty
 * of NON-INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Resin Open Source; if not, write to the
 *
 *   Free Software Foundation, Inc.
 *   59 Temple Place, Suite 330
 *   Boston, MA 02111-1307  USA
 *
 * @author Scott Ferguson
 */
package com.caucho.db.jdbc;

import com.caucho.sql.SQLExceptionWrapper;
import com.caucho.util.L10N;

import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.math.BigDecimal;
import java.sql.*;
import java.util.Calendar;
import java.util.Map;

/**
 * The JDBC statement implementation.
 */
abstract public class AbstractResultSet implements java.sql.ResultSet {
  protected final static L10N L = new L10N(AbstractResultSet.class);
  private int _rowNumber;
  
  public boolean absolute(int row)
    throws SQLException
  {
    if (row < getRow())
      return false;

    while (getRow() < row) {
      if (! next())
	return false;
    }

    return true;
  }

  public void afterLast()
  {
  }

  public void beforeFirst()
  {
  }

  public void cancelRowUpdates()
  {
  }

  public void clearWarnings()
  {
  }

  public void deleteRow()
  {
  }

  public int getRow()
    throws SQLException
  {
    if (_rowNumber < 0)
      throw new SQLException("can't call getRow() after close()");
    
    return _rowNumber;
  }

  public boolean isBeforeFirst()
    throws SQLException
  {
    return getRow() == 0;
  }

  public boolean isAfterLast()
  {
    return false;
  }

  public boolean isFirst()
    throws SQLException
  {
    return _rowNumber == 1;
  }

  public boolean first()
    throws SQLException
  {
    return isFirst();
  }

  public boolean isLast()
    throws SQLException
  {
    return false;
  }

  public boolean last()
    throws SQLException
  {
    return isLast();
  }

  public int getConcurrency()
  {
    return 0;
  }

  public String getCursorName()
  {
    return null;
  }

  abstract public java.sql.Statement getStatement()
    throws SQLException;

  abstract public java.sql.ResultSetMetaData getMetaData()
    throws SQLException;

  abstract public boolean next()
    throws SQLException;

  abstract public boolean wasNull()
    throws SQLException;

  abstract public int findColumn(String columnName)
    throws SQLException;

  public int getType()
  {
    return 0;
  }

  public BigDecimal getBigDecimal(int columnIndex)
    throws SQLException
  {
    return null;
  }

  public BigDecimal getBigDecimal(int columnIndex, int scale)
    throws SQLException
  {
    return getBigDecimal(columnIndex).setScale(scale);
  }

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

  public BigDecimal getBigDecimal(String columnName, int scale)
    throws SQLException
  {
    return getBigDecimal(findColumn(columnName), scale);
  }

  /**
   * Returns the boolean value for the column.
   */
  public boolean getBoolean(int columnIndex)
    throws SQLException
  {
    String v = getString(columnIndex);

    return (v != null && ! v.equals("") && ! v.equals("0") && ! v.equals("n"));
  }

  /**
   * Returns the boolean value for the named column.
   */
  public boolean getBoolean(String columnName)
    throws SQLException
  {
    return getBoolean(findColumn(columnName));
  }

  public byte getByte(int columnIndex)
    throws SQLException
  {
    return (byte) getInt(columnIndex);
  }

  public byte getByte(String columnName)
    throws SQLException
  {
    return getByte(findColumn(columnName));
  }

  /**
   * Returns the byte value for the column.
   */
  public byte []getBytes(int columnIndex)
    throws SQLException
  {
    try {
      Blob blob = getBlob(columnIndex);

      if (blob == null)
	return null;

      int length = (int) blob.length();

      byte []bytes = new byte[length];

      InputStream is = blob.getBinaryStream();

      try {
	int offset = 0;
	int sublen;

	while (length > 0 && (sublen = is.read(bytes, offset, length)) > 0) {
	  offset += sublen;
	  length -= sublen;
	}
      } finally {
	is.close();
      }

      return bytes;
    } catch (IOException e) {
      throw new SQLExceptionWrapper(e);
    }
  }

  public byte []getBytes(String columnName)
    throws SQLException
  {
    return getBytes(findColumn(columnName));
  }

  public Reader getCharacterStream(int columnIndex)
    throws SQLException
  {
    throw new UnsupportedOperationException();
  }

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

  public java.sql.Date getDate(int columnIndex)
    throws SQLException
  {
    throw new UnsupportedOperationException();
  }

  public java.sql.Date getDate(String columnName)
    throws SQLException
  {
    return getDate(findColumn(columnName));
  }

  public java.sql.Date getDate(int columnIndex, Calendar cal)
    throws SQLException
  {
    return getDate(columnIndex);
  }

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

  /**
   * Returns the double value for the column.
   */
  public double getDouble(int columnIndex)
    throws SQLException
  {
    String v = getString(columnIndex);

    if (v == null)
      return 0;
    else
      return Double.parseDouble(v);
  }

  /**
   * Returns the double value for the named column.
   */
  public double getDouble(String columnName)
    throws SQLException
  {
    return getDouble(findColumn(columnName));
  }

  public int getFetchDirection()
  {
    return 0;
  }

  public int getFetchSize()
  {
    return 0;
  }

  /**
   * Returns the float value for the column.
   */
  public float getFloat(int columnIndex)
    throws SQLException
  {
    return (float) getDouble(columnIndex);
  }

  /**
   * Returns the float value for the named column.
   */
  public float getFloat(String columnName)
    throws SQLException
  {
    return (float) getDouble(findColumn(columnName));
  }

  /**
   * Returns the integer value for the column.
   */
  public int getInt(int columnIndex)
    throws SQLException
  {
    String v = getString(columnIndex);

    if (v == null)
      return 0;
    else
      return Integer.parseInt(v);
  }

  /**
   * Returns the integer value for the named column.
   */
  public int getInt(String columnName)
    throws SQLException
  {
    return getInt(findColumn(columnName));
  }

  /**
   * Returns the long value for the column.
   */
  public long getLong(int columnIndex)
    throws SQLException
  {
    String v = getString(columnIndex);

    if (v == null)
      return 0;
    else
      return Long.parseLong(v);
  }

  /**
   * Returns the long value for the named column.
   */
  public long getLong(String columnName)
    throws SQLException
  {
    return getLong(findColumn(columnName));
  }

  public Object getObject(int columnIndex)
    throws SQLException
  {
    return getString(columnIndex);
  }

  public Object getObject(String columnName)
    throws SQLException
  {
    return getObject(findColumn(columnName));
  }

  public Object getObject(int columnIndex, Map<String,Class<?>> map)
    throws SQLException
  {
    return getObject(columnIndex);
  }

  public Object getObject(String columnName, Map<String,Class<?>> map)
    throws SQLException
  {
    return getObject(findColumn(columnName), map);
  }

  public short getShort(int columnIndex)
    throws SQLException
  {
    return (short) getInt(columnIndex);
  }

  public short getShort(String columnName)
    throws SQLException
  {
    return getShort(findColumn(columnName));
  }

  abstract public String getString(int columnIndex)
    throws SQLException;

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

  public Time getTime(int columnIndex)
    throws SQLException
  {
    throw new UnsupportedOperationException();
  }

  public Time getTime(String columnName)
    throws SQLException
  {
    return getTime(findColumn(columnName));
  }